./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/Fibonacci05.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci05.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF --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 97829031814878890268a6b8dbba5c3e987e2ec78ab2dc94181f9e68090060bd --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 22:27:31,684 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 22:27:31,686 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 22:27:31,735 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 22:27:31,736 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 22:27:31,740 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 22:27:31,745 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 22:27:31,747 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 22:27:31,749 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 22:27:31,750 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 22:27:31,751 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 22:27:31,752 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 22:27:31,753 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 22:27:31,754 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 22:27:31,755 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 22:27:31,757 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 22:27:31,758 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 22:27:31,759 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 22:27:31,761 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 22:27:31,763 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 22:27:31,765 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 22:27:31,766 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 22:27:31,767 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 22:27:31,768 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 22:27:31,772 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 22:27:31,772 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 22:27:31,772 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 22:27:31,773 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 22:27:31,774 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 22:27:31,775 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 22:27:31,775 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 22:27:31,776 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 22:27:31,777 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 22:27:31,778 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 22:27:31,779 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 22:27:31,780 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 22:27:31,780 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 22:27:31,781 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 22:27:31,781 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 22:27:31,782 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 22:27:31,783 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 22:27:31,784 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-12 22:27:31,808 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 22:27:31,808 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 22:27:31,809 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 22:27:31,809 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 22:27:31,810 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 22:27:31,810 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 22:27:31,811 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 22:27:31,811 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 22:27:31,811 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 22:27:31,812 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 22:27:31,812 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 22:27:31,812 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 22:27:31,813 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 22:27:31,813 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 22:27:31,813 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 22:27:31,814 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 22:27:31,814 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 22:27:31,815 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 22:27:31,815 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 22:27:31,815 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 22:27:31,816 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 22:27:31,816 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 22:27:31,816 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 22:27:31,817 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 22:27:31,817 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 22:27:31,817 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 22:27:31,818 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 22:27:31,818 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 22:27:31,818 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 22:27:31,819 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 22:27:31,819 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 22:27:31,819 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:27:31,820 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 22:27:31,820 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 22:27:31,821 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 22:27:31,821 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 22:27:31,821 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 22:27:31,822 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 22:27:31,822 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 22:27:31,822 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 22:27:31,822 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_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 97829031814878890268a6b8dbba5c3e987e2ec78ab2dc94181f9e68090060bd [2021-11-12 22:27:32,084 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 22:27:32,121 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 22:27:32,125 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 22:27:32,126 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 22:27:32,127 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 22:27:32,129 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/recursive/Fibonacci05.c [2021-11-12 22:27:32,189 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/data/c02549d0f/b93b0db02c4e40cdab921da8fe6f2107/FLAGa6c5e22db [2021-11-12 22:27:32,570 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 22:27:32,571 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/sv-benchmarks/c/recursive/Fibonacci05.c [2021-11-12 22:27:32,576 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/data/c02549d0f/b93b0db02c4e40cdab921da8fe6f2107/FLAGa6c5e22db [2021-11-12 22:27:32,982 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/data/c02549d0f/b93b0db02c4e40cdab921da8fe6f2107 [2021-11-12 22:27:32,984 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 22:27:32,985 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 22:27:32,998 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 22:27:32,998 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 22:27:33,001 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 22:27:33,002 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:27:32" (1/1) ... [2021-11-12 22:27:33,003 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3860f420 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:33, skipping insertion in model container [2021-11-12 22:27:33,003 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:27:32" (1/1) ... [2021-11-12 22:27:33,009 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 22:27:33,019 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 22:27:33,201 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_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/sv-benchmarks/c/recursive/Fibonacci05.c[746,759] [2021-11-12 22:27:33,204 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:27:33,213 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 22:27:33,227 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_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/sv-benchmarks/c/recursive/Fibonacci05.c[746,759] [2021-11-12 22:27:33,227 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:27:33,240 INFO L208 MainTranslator]: Completed translation [2021-11-12 22:27:33,240 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:33 WrapperNode [2021-11-12 22:27:33,241 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 22:27:33,242 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 22:27:33,242 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 22:27:33,242 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 22:27:33,251 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:33" (1/1) ... [2021-11-12 22:27:33,258 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:33" (1/1) ... [2021-11-12 22:27:33,273 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 22:27:33,274 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 22:27:33,274 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 22:27:33,275 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 22:27:33,282 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:33" (1/1) ... [2021-11-12 22:27:33,283 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:33" (1/1) ... [2021-11-12 22:27:33,284 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:33" (1/1) ... [2021-11-12 22:27:33,284 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:33" (1/1) ... [2021-11-12 22:27:33,288 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:33" (1/1) ... [2021-11-12 22:27:33,289 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:33" (1/1) ... [2021-11-12 22:27:33,290 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:33" (1/1) ... [2021-11-12 22:27:33,292 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 22:27:33,293 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 22:27:33,293 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 22:27:33,293 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 22:27:33,294 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:33" (1/1) ... [2021-11-12 22:27:33,301 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:27:33,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:27:33,334 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 22:27:33,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 22:27:33,382 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2021-11-12 22:27:33,383 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2021-11-12 22:27:33,384 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 22:27:33,384 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 22:27:33,384 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-12 22:27:33,384 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 22:27:33,588 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 22:27:33,588 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-12 22:27:33,590 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:27:33 BoogieIcfgContainer [2021-11-12 22:27:33,591 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 22:27:33,592 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 22:27:33,593 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 22:27:33,599 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 22:27:33,599 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 10:27:32" (1/3) ... [2021-11-12 22:27:33,600 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c7d84a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:27:33, skipping insertion in model container [2021-11-12 22:27:33,600 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:33" (2/3) ... [2021-11-12 22:27:33,601 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c7d84a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:27:33, skipping insertion in model container [2021-11-12 22:27:33,601 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:27:33" (3/3) ... [2021-11-12 22:27:33,602 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci05.c [2021-11-12 22:27:33,613 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 22:27:33,613 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-12 22:27:33,659 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 22:27:33,666 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 [2021-11-12 22:27:33,667 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-12 22:27:33,683 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-12 22:27:33,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-12 22:27:33,688 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:27:33,689 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:27:33,689 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:27:33,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:27:33,695 INFO L85 PathProgramCache]: Analyzing trace with hash -1615401540, now seen corresponding path program 1 times [2021-11-12 22:27:33,704 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:27:33,705 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [231271728] [2021-11-12 22:27:33,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:33,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:27:33,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:33,891 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:27:33,892 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:27:33,892 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [231271728] [2021-11-12 22:27:33,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [231271728] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:27:33,893 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:27:33,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-12 22:27:33,895 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138453225] [2021-11-12 22:27:33,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:27:33,900 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 22:27:33,900 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:27:33,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 22:27:33,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-12 22:27:33,928 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-12 22:27:34,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:27:34,034 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2021-11-12 22:27:34,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 22:27:34,051 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-11-12 22:27:34,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:27:34,059 INFO L225 Difference]: With dead ends: 27 [2021-11-12 22:27:34,059 INFO L226 Difference]: Without dead ends: 17 [2021-11-12 22:27:34,062 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-12 22:27:34,078 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 10 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 57.27ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.96ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 71.78ms IncrementalHoareTripleChecker+Time [2021-11-12 22:27:34,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 26 Invalid, 43 Unknown, 0 Unchecked, 1.96ms Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 71.78ms Time] [2021-11-12 22:27:34,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-12 22:27:34,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-12 22:27:34,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-12 22:27:34,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-11-12 22:27:34,132 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 9 [2021-11-12 22:27:34,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:27:34,133 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-11-12 22:27:34,133 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-12 22:27:34,133 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-11-12 22:27:34,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-12 22:27:34,135 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:27:34,135 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:27:34,136 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-12 22:27:34,137 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:27:34,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:27:34,140 INFO L85 PathProgramCache]: Analyzing trace with hash -2136894566, now seen corresponding path program 1 times [2021-11-12 22:27:34,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:27:34,141 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2125400695] [2021-11-12 22:27:34,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:34,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:27:34,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:34,261 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:27:34,261 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:27:34,261 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2125400695] [2021-11-12 22:27:34,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2125400695] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:27:34,262 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:27:34,262 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-12 22:27:34,262 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694191895] [2021-11-12 22:27:34,263 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:27:34,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 22:27:34,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:27:34,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 22:27:34,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-12 22:27:34,265 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-12 22:27:34,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:27:34,328 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2021-11-12 22:27:34,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 22:27:34,329 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-11-12 22:27:34,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:27:34,330 INFO L225 Difference]: With dead ends: 23 [2021-11-12 22:27:34,331 INFO L226 Difference]: Without dead ends: 19 [2021-11-12 22:27:34,332 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-12 22:27:34,335 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 7 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 35.52ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.38ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 48.21ms IncrementalHoareTripleChecker+Time [2021-11-12 22:27:34,337 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 26 Invalid, 35 Unknown, 0 Unchecked, 1.38ms Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 48.21ms Time] [2021-11-12 22:27:34,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-12 22:27:34,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2021-11-12 22:27:34,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-12 22:27:34,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-11-12 22:27:34,346 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 10 [2021-11-12 22:27:34,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:27:34,348 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-11-12 22:27:34,349 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-12 22:27:34,352 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-11-12 22:27:34,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-12 22:27:34,354 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:27:34,354 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:27:34,355 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-12 22:27:34,355 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:27:34,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:27:34,356 INFO L85 PathProgramCache]: Analyzing trace with hash -338238899, now seen corresponding path program 1 times [2021-11-12 22:27:34,357 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:27:34,362 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [345005830] [2021-11-12 22:27:34,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:34,363 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:27:34,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:34,492 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:27:34,493 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:27:34,508 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [345005830] [2021-11-12 22:27:34,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [345005830] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:27:34,509 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1469398793] [2021-11-12 22:27:34,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:34,509 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:27:34,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:27:34,511 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:27:34,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-12 22:27:34,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:34,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:27:34,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:27:34,687 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:27:34,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:27:34,933 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:27:34,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1469398793] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:27:34,933 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1241866743] [2021-11-12 22:27:34,952 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-12 22:27:34,953 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:27:34,958 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:610) 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) [2021-11-12 22:27:34,960 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:27:34,960 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 12 [2021-11-12 22:27:34,960 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503835543] [2021-11-12 22:27:34,961 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:27:34,962 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-12 22:27:34,962 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:27:34,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-12 22:27:34,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:27:34,963 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 12 states, 11 states have (on average 2.909090909090909) internal successors, (32), 12 states have internal predecessors, (32), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (9), 5 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-12 22:27:35,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:27:35,084 INFO L93 Difference]: Finished difference Result 41 states and 59 transitions. [2021-11-12 22:27:35,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 22:27:35,084 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.909090909090909) internal successors, (32), 12 states have internal predecessors, (32), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (9), 5 states have call predecessors, (9), 7 states have call successors, (9) Word has length 22 [2021-11-12 22:27:35,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:27:35,086 INFO L225 Difference]: With dead ends: 41 [2021-11-12 22:27:35,086 INFO L226 Difference]: Without dead ends: 24 [2021-11-12 22:27:35,087 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2021-11-12 22:27:35,089 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 26 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 53.57ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.67ms SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 65.10ms IncrementalHoareTripleChecker+Time [2021-11-12 22:27:35,090 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 47 Invalid, 112 Unknown, 0 Unchecked, 2.67ms Time], IncrementalHoareTripleChecker [40 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 65.10ms Time] [2021-11-12 22:27:35,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-12 22:27:35,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-12 22:27:35,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 17 states have internal predecessors, (17), 4 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-12 22:27:35,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2021-11-12 22:27:35,098 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 22 [2021-11-12 22:27:35,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:27:35,098 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2021-11-12 22:27:35,099 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.909090909090909) internal successors, (32), 12 states have internal predecessors, (32), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (9), 5 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-12 22:27:35,099 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2021-11-12 22:27:35,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-12 22:27:35,102 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:27:35,102 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 5, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-12 22:27:35,136 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-12 22:27:35,325 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:27:35,326 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:27:35,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:27:35,326 INFO L85 PathProgramCache]: Analyzing trace with hash 271867855, now seen corresponding path program 1 times [2021-11-12 22:27:35,326 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:27:35,326 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897220007] [2021-11-12 22:27:35,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:35,327 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:27:35,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:35,414 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 11 proven. 48 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-12 22:27:35,414 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:27:35,414 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897220007] [2021-11-12 22:27:35,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [897220007] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:27:35,415 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [505349184] [2021-11-12 22:27:35,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:35,415 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:27:35,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:27:35,416 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:27:35,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-12 22:27:35,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:35,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-12 22:27:35,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:27:35,647 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 11 proven. 48 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-12 22:27:35,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:27:36,054 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 11 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-12 22:27:36,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [505349184] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:27:36,055 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [947259674] [2021-11-12 22:27:36,057 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-12 22:27:36,057 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:27:36,058 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java: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:610) 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) [2021-11-12 22:27:36,059 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:27:36,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 12 [2021-11-12 22:27:36,060 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540067019] [2021-11-12 22:27:36,060 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:27:36,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-12 22:27:36,061 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:27:36,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-12 22:27:36,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:27:36,062 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 7 states have call successors, (9), 1 states have call predecessors, (9), 5 states have return successors, (11), 6 states have call predecessors, (11), 7 states have call successors, (11) [2021-11-12 22:27:36,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:27:36,206 INFO L93 Difference]: Finished difference Result 43 states and 73 transitions. [2021-11-12 22:27:36,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 22:27:36,207 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 7 states have call successors, (9), 1 states have call predecessors, (9), 5 states have return successors, (11), 6 states have call predecessors, (11), 7 states have call successors, (11) Word has length 50 [2021-11-12 22:27:36,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:27:36,211 INFO L225 Difference]: With dead ends: 43 [2021-11-12 22:27:36,214 INFO L226 Difference]: Without dead ends: 37 [2021-11-12 22:27:36,215 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2021-11-12 22:27:36,216 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 16 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 71.31ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.76ms SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 85.52ms IncrementalHoareTripleChecker+Time [2021-11-12 22:27:36,219 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 48 Invalid, 99 Unknown, 0 Unchecked, 1.76ms Time], IncrementalHoareTripleChecker [21 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 85.52ms Time] [2021-11-12 22:27:36,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-12 22:27:36,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2021-11-12 22:27:36,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 23 states have internal predecessors, (23), 6 states have call successors, (6), 1 states have call predecessors, (6), 6 states have return successors, (30), 9 states have call predecessors, (30), 6 states have call successors, (30) [2021-11-12 22:27:36,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 59 transitions. [2021-11-12 22:27:36,235 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 59 transitions. Word has length 50 [2021-11-12 22:27:36,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:27:36,236 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 59 transitions. [2021-11-12 22:27:36,236 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 7 states have call successors, (9), 1 states have call predecessors, (9), 5 states have return successors, (11), 6 states have call predecessors, (11), 7 states have call successors, (11) [2021-11-12 22:27:36,236 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 59 transitions. [2021-11-12 22:27:36,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-12 22:27:36,243 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:27:36,243 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 13, 9, 9, 9, 9, 9, 9, 9, 6, 4, 1, 1, 1, 1, 1, 1] [2021-11-12 22:27:36,268 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-12 22:27:36,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:27:36,450 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:27:36,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:27:36,450 INFO L85 PathProgramCache]: Analyzing trace with hash -1035226507, now seen corresponding path program 2 times [2021-11-12 22:27:36,450 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:27:36,450 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [284858010] [2021-11-12 22:27:36,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:36,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:27:36,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:36,711 INFO L134 CoverageAnalysis]: Checked inductivity of 906 backedges. 52 proven. 316 refuted. 0 times theorem prover too weak. 538 trivial. 0 not checked. [2021-11-12 22:27:36,711 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:27:36,711 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [284858010] [2021-11-12 22:27:36,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [284858010] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:27:36,729 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1342200140] [2021-11-12 22:27:36,729 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:27:36,729 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:27:36,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:27:36,741 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:27:36,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-12 22:27:36,856 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-12 22:27:36,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:27:36,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-12 22:27:36,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:27:37,244 INFO L134 CoverageAnalysis]: Checked inductivity of 906 backedges. 476 proven. 13 refuted. 0 times theorem prover too weak. 417 trivial. 0 not checked. [2021-11-12 22:27:37,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:27:38,015 INFO L134 CoverageAnalysis]: Checked inductivity of 906 backedges. 267 proven. 60 refuted. 0 times theorem prover too weak. 579 trivial. 0 not checked. [2021-11-12 22:27:38,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1342200140] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:27:38,016 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1009179666] [2021-11-12 22:27:38,018 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-12 22:27:38,019 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:27:38,019 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:610) 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) [2021-11-12 22:27:38,020 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:27:38,020 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 17 [2021-11-12 22:27:38,021 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614889796] [2021-11-12 22:27:38,021 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:27:38,022 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-12 22:27:38,022 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:27:38,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-12 22:27:38,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-11-12 22:27:38,024 INFO L87 Difference]: Start difference. First operand 34 states and 59 transitions. Second operand has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 17 states have internal predecessors, (58), 11 states have call successors, (15), 2 states have call predecessors, (15), 10 states have return successors, (22), 9 states have call predecessors, (22), 11 states have call successors, (22) [2021-11-12 22:27:38,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:27:38,429 INFO L93 Difference]: Finished difference Result 86 states and 173 transitions. [2021-11-12 22:27:38,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-12 22:27:38,430 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 17 states have internal predecessors, (58), 11 states have call successors, (15), 2 states have call predecessors, (15), 10 states have return successors, (22), 9 states have call predecessors, (22), 11 states have call successors, (22) Word has length 130 [2021-11-12 22:27:38,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:27:38,432 INFO L225 Difference]: With dead ends: 86 [2021-11-12 22:27:38,432 INFO L226 Difference]: Without dead ends: 54 [2021-11-12 22:27:38,435 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 256 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=279, Invalid=777, Unknown=0, NotChecked=0, Total=1056 [2021-11-12 22:27:38,436 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 89 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 150.58ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.70ms SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 195.00ms IncrementalHoareTripleChecker+Time [2021-11-12 22:27:38,436 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 79 Invalid, 313 Unknown, 0 Unchecked, 3.70ms Time], IncrementalHoareTripleChecker [119 Valid, 194 Invalid, 0 Unknown, 0 Unchecked, 195.00ms Time] [2021-11-12 22:27:38,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-12 22:27:38,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-11-12 22:27:38,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 36 states have internal predecessors, (41), 9 states have call successors, (9), 6 states have call predecessors, (9), 7 states have return successors, (23), 11 states have call predecessors, (23), 9 states have call successors, (23) [2021-11-12 22:27:38,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 73 transitions. [2021-11-12 22:27:38,449 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 73 transitions. Word has length 130 [2021-11-12 22:27:38,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:27:38,449 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 73 transitions. [2021-11-12 22:27:38,449 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 17 states have internal predecessors, (58), 11 states have call successors, (15), 2 states have call predecessors, (15), 10 states have return successors, (22), 9 states have call predecessors, (22), 11 states have call successors, (22) [2021-11-12 22:27:38,450 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 73 transitions. [2021-11-12 22:27:38,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-11-12 22:27:38,453 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:27:38,453 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 20, 12, 12, 12, 12, 12, 12, 12, 8, 5, 1, 1, 1, 1, 1, 1] [2021-11-12 22:27:38,478 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-12 22:27:38,668 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:27:38,668 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:27:38,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:27:38,669 INFO L85 PathProgramCache]: Analyzing trace with hash -454540380, now seen corresponding path program 3 times [2021-11-12 22:27:38,669 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:27:38,669 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [599108447] [2021-11-12 22:27:38,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:38,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:27:38,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:38,843 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 93 proven. 533 refuted. 0 times theorem prover too weak. 1028 trivial. 0 not checked. [2021-11-12 22:27:38,844 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:27:38,844 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [599108447] [2021-11-12 22:27:38,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [599108447] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:27:38,844 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1394085796] [2021-11-12 22:27:38,844 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:27:38,845 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:27:38,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:27:38,858 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:27:38,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-12 22:27:38,958 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:27:38,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:27:38,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 416 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-12 22:27:38,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:27:39,294 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 93 proven. 533 refuted. 0 times theorem prover too weak. 1028 trivial. 0 not checked. [2021-11-12 22:27:39,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:27:40,755 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 93 proven. 573 refuted. 0 times theorem prover too weak. 988 trivial. 0 not checked. [2021-11-12 22:27:40,755 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1394085796] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:27:40,755 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [387471133] [2021-11-12 22:27:40,758 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-12 22:27:40,758 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:27:40,758 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:610) 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) [2021-11-12 22:27:40,759 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:27:40,760 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 15] total 18 [2021-11-12 22:27:40,760 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343892603] [2021-11-12 22:27:40,760 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:27:40,761 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-12 22:27:40,761 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:27:40,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-12 22:27:40,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2021-11-12 22:27:40,763 INFO L87 Difference]: Start difference. First operand 54 states and 73 transitions. Second operand has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 18 states have internal predecessors, (55), 13 states have call successors, (15), 1 states have call predecessors, (15), 8 states have return successors, (20), 9 states have call predecessors, (20), 13 states have call successors, (20) [2021-11-12 22:27:40,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:27:40,981 INFO L93 Difference]: Finished difference Result 70 states and 108 transitions. [2021-11-12 22:27:40,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-12 22:27:40,982 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 18 states have internal predecessors, (55), 13 states have call successors, (15), 1 states have call predecessors, (15), 8 states have return successors, (20), 9 states have call predecessors, (20), 13 states have call successors, (20) Word has length 173 [2021-11-12 22:27:40,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:27:40,985 INFO L225 Difference]: With dead ends: 70 [2021-11-12 22:27:40,986 INFO L226 Difference]: Without dead ends: 64 [2021-11-12 22:27:40,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 366 GetRequests, 343 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=195, Invalid=405, Unknown=0, NotChecked=0, Total=600 [2021-11-12 22:27:40,987 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 69 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 116.05ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.45ms SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 140.43ms IncrementalHoareTripleChecker+Time [2021-11-12 22:27:40,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 63 Invalid, 212 Unknown, 0 Unchecked, 2.45ms Time], IncrementalHoareTripleChecker [99 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 140.43ms Time] [2021-11-12 22:27:40,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-12 22:27:40,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-11-12 22:27:41,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 43 states have (on average 1.0930232558139534) internal successors, (47), 42 states have internal predecessors, (47), 11 states have call successors, (11), 6 states have call predecessors, (11), 9 states have return successors, (43), 15 states have call predecessors, (43), 11 states have call successors, (43) [2021-11-12 22:27:41,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 101 transitions. [2021-11-12 22:27:41,003 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 101 transitions. Word has length 173 [2021-11-12 22:27:41,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:27:41,004 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 101 transitions. [2021-11-12 22:27:41,004 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 18 states have internal predecessors, (55), 13 states have call successors, (15), 1 states have call predecessors, (15), 8 states have return successors, (20), 9 states have call predecessors, (20), 13 states have call successors, (20) [2021-11-12 22:27:41,005 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 101 transitions. [2021-11-12 22:27:41,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 583 [2021-11-12 22:27:41,027 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:27:41,027 INFO L514 BasicCegarLoop]: trace histogram [85, 85, 69, 42, 42, 42, 42, 42, 42, 42, 27, 16, 1, 1, 1, 1, 1, 1] [2021-11-12 22:27:41,066 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-12 22:27:41,240 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-12 22:27:41,241 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:27:41,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:27:41,241 INFO L85 PathProgramCache]: Analyzing trace with hash 268512456, now seen corresponding path program 4 times [2021-11-12 22:27:41,241 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:27:41,241 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1582589343] [2021-11-12 22:27:41,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:41,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:27:41,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:41,880 INFO L134 CoverageAnalysis]: Checked inductivity of 20070 backedges. 1155 proven. 3628 refuted. 0 times theorem prover too weak. 15287 trivial. 0 not checked. [2021-11-12 22:27:41,880 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:27:41,882 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1582589343] [2021-11-12 22:27:41,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1582589343] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:27:41,882 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [139344333] [2021-11-12 22:27:41,882 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 22:27:41,883 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:27:41,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:27:41,889 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:27:41,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-12 22:27:42,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:42,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 1324 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-12 22:27:42,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:27:43,140 INFO L134 CoverageAnalysis]: Checked inductivity of 20070 backedges. 9532 proven. 2375 refuted. 0 times theorem prover too weak. 8163 trivial. 0 not checked. [2021-11-12 22:27:43,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:27:47,968 INFO L134 CoverageAnalysis]: Checked inductivity of 20070 backedges. 1322 proven. 4180 refuted. 0 times theorem prover too weak. 14568 trivial. 0 not checked. [2021-11-12 22:27:47,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [139344333] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:27:47,968 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [967039470] [2021-11-12 22:27:47,974 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-12 22:27:47,974 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:27:47,975 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:610) 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) [2021-11-12 22:27:47,976 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:27:47,977 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 27] total 32 [2021-11-12 22:27:47,977 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329222137] [2021-11-12 22:27:47,977 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:27:47,983 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-12 22:27:47,984 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:27:47,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-12 22:27:47,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=823, Unknown=0, NotChecked=0, Total=992 [2021-11-12 22:27:47,987 INFO L87 Difference]: Start difference. First operand 64 states and 101 transitions. Second operand has 32 states, 32 states have (on average 3.1875) internal successors, (102), 32 states have internal predecessors, (102), 26 states have call successors, (32), 2 states have call predecessors, (32), 14 states have return successors, (43), 15 states have call predecessors, (43), 26 states have call successors, (43) [2021-11-12 22:27:48,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:27:48,861 INFO L93 Difference]: Finished difference Result 165 states and 343 transitions. [2021-11-12 22:27:48,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-12 22:27:48,862 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.1875) internal successors, (102), 32 states have internal predecessors, (102), 26 states have call successors, (32), 2 states have call predecessors, (32), 14 states have return successors, (43), 15 states have call predecessors, (43), 26 states have call successors, (43) Word has length 582 [2021-11-12 22:27:48,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:27:48,866 INFO L225 Difference]: With dead ends: 165 [2021-11-12 22:27:48,866 INFO L226 Difference]: Without dead ends: 105 [2021-11-12 22:27:48,870 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1213 GetRequests, 1155 SyntacticMatches, 2 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 678 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=824, Invalid=2482, Unknown=0, NotChecked=0, Total=3306 [2021-11-12 22:27:48,871 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 315 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 448 mSolverCounterSat, 534 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 359.17ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 315 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 982 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.53ms SdHoareTripleChecker+Time, 534 IncrementalHoareTripleChecker+Valid, 448 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 443.98ms IncrementalHoareTripleChecker+Time [2021-11-12 22:27:48,871 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [315 Valid, 149 Invalid, 982 Unknown, 0 Unchecked, 6.53ms Time], IncrementalHoareTripleChecker [534 Valid, 448 Invalid, 0 Unknown, 0 Unchecked, 443.98ms Time] [2021-11-12 22:27:48,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-12 22:27:48,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 94. [2021-11-12 22:27:48,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 67 states have (on average 1.044776119402985) internal successors, (70), 64 states have internal predecessors, (70), 17 states have call successors, (17), 14 states have call predecessors, (17), 9 states have return successors, (43), 15 states have call predecessors, (43), 17 states have call successors, (43) [2021-11-12 22:27:48,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 130 transitions. [2021-11-12 22:27:48,887 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 130 transitions. Word has length 582 [2021-11-12 22:27:48,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:27:48,888 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 130 transitions. [2021-11-12 22:27:48,889 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 3.1875) internal successors, (102), 32 states have internal predecessors, (102), 26 states have call successors, (32), 2 states have call predecessors, (32), 14 states have return successors, (43), 15 states have call predecessors, (43), 26 states have call successors, (43) [2021-11-12 22:27:48,889 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 130 transitions. [2021-11-12 22:27:48,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 664 [2021-11-12 22:27:48,910 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:27:48,910 INFO L514 BasicCegarLoop]: trace histogram [97, 97, 78, 48, 48, 48, 48, 48, 48, 48, 30, 19, 1, 1, 1, 1, 1, 1] [2021-11-12 22:27:48,945 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-12 22:27:49,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:27:49,126 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:27:49,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:27:49,126 INFO L85 PathProgramCache]: Analyzing trace with hash -1312747780, now seen corresponding path program 5 times [2021-11-12 22:27:49,126 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:27:49,126 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [462599666] [2021-11-12 22:27:49,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:49,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:27:49,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:27:49,628 INFO L134 CoverageAnalysis]: Checked inductivity of 26139 backedges. 2015 proven. 4150 refuted. 0 times theorem prover too weak. 19974 trivial. 0 not checked. [2021-11-12 22:27:49,628 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:27:49,629 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [462599666] [2021-11-12 22:27:49,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [462599666] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:27:49,629 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [306898599] [2021-11-12 22:27:49,629 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:27:49,629 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:27:49,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:27:49,630 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:27:49,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-12 22:27:50,008 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 53 check-sat command(s) [2021-11-12 22:27:50,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:27:50,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 1013 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-12 22:27:50,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:27:51,069 INFO L134 CoverageAnalysis]: Checked inductivity of 26139 backedges. 3458 proven. 339 refuted. 0 times theorem prover too weak. 22342 trivial. 0 not checked. [2021-11-12 22:27:51,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:27:54,159 INFO L134 CoverageAnalysis]: Checked inductivity of 26139 backedges. 3458 proven. 360 refuted. 0 times theorem prover too weak. 22321 trivial. 0 not checked. [2021-11-12 22:27:54,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [306898599] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:27:54,159 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [40749151] [2021-11-12 22:27:54,162 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-12 22:27:54,162 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:27:54,163 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:610) 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) [2021-11-12 22:27:54,164 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 22:27:54,165 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 12, 17] total 30 [2021-11-12 22:27:54,165 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958080342] [2021-11-12 22:27:54,165 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 22:27:54,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-12 22:27:54,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:27:54,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-12 22:27:54,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=715, Unknown=0, NotChecked=0, Total=870 [2021-11-12 22:27:54,169 INFO L87 Difference]: Start difference. First operand 94 states and 130 transitions. Second operand has 30 states, 30 states have (on average 3.0) internal successors, (90), 30 states have internal predecessors, (90), 21 states have call successors, (30), 1 states have call predecessors, (30), 16 states have return successors, (45), 22 states have call predecessors, (45), 21 states have call successors, (45) [2021-11-12 22:27:55,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:27:55,116 INFO L93 Difference]: Finished difference Result 221 states and 355 transitions. [2021-11-12 22:27:55,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-12 22:27:55,117 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.0) internal successors, (90), 30 states have internal predecessors, (90), 21 states have call successors, (30), 1 states have call predecessors, (30), 16 states have return successors, (45), 22 states have call predecessors, (45), 21 states have call successors, (45) Word has length 663 [2021-11-12 22:27:55,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:27:55,125 INFO L225 Difference]: With dead ends: 221 [2021-11-12 22:27:55,125 INFO L226 Difference]: Without dead ends: 131 [2021-11-12 22:27:55,129 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1385 GetRequests, 1322 SyntacticMatches, 3 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 864 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=841, Invalid=2941, Unknown=0, NotChecked=0, Total=3782 [2021-11-12 22:27:55,129 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 339 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 375 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 323.34ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 339 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 855 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.50ms SdHoareTripleChecker+Time, 375 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 419.45ms IncrementalHoareTripleChecker+Time [2021-11-12 22:27:55,130 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [339 Valid, 156 Invalid, 855 Unknown, 0 Unchecked, 5.50ms Time], IncrementalHoareTripleChecker [375 Valid, 480 Invalid, 0 Unknown, 0 Unchecked, 419.45ms Time] [2021-11-12 22:27:55,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-11-12 22:27:55,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 112. [2021-11-12 22:27:55,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 80 states have (on average 1.05) internal successors, (84), 77 states have internal predecessors, (84), 22 states have call successors, (22), 18 states have call predecessors, (22), 9 states have return successors, (46), 16 states have call predecessors, (46), 22 states have call successors, (46) [2021-11-12 22:27:55,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 152 transitions. [2021-11-12 22:27:55,168 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 152 transitions. Word has length 663 [2021-11-12 22:27:55,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:27:55,186 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 152 transitions. [2021-11-12 22:27:55,186 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 3.0) internal successors, (90), 30 states have internal predecessors, (90), 21 states have call successors, (30), 1 states have call predecessors, (30), 16 states have return successors, (45), 22 states have call predecessors, (45), 21 states have call successors, (45) [2021-11-12 22:27:55,187 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 152 transitions. [2021-11-12 22:27:55,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 460 [2021-11-12 22:27:55,199 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:27:55,200 INFO L514 BasicCegarLoop]: trace histogram [67, 67, 54, 33, 33, 33, 33, 33, 33, 33, 21, 13, 1, 1, 1, 1, 1, 1] [2021-11-12 22:27:55,241 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-12 22:27:55,413 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:27:55,413 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:27:55,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:27:55,414 INFO L85 PathProgramCache]: Analyzing trace with hash 2068824531, now seen corresponding path program 6 times [2021-11-12 22:27:55,414 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:27:55,415 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [37841228] [2021-11-12 22:27:55,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:27:55,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:27:55,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-12 22:27:55,542 INFO L355 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-12 22:27:55,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-12 22:27:55,810 INFO L133 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-11-12 22:27:55,811 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-11-12 22:27:55,812 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-12 22:27:55,814 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-12 22:27:55,817 INFO L732 BasicCegarLoop]: Path program histogram: [6, 1, 1, 1] [2021-11-12 22:27:55,824 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-12 22:27:55,892 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.NullPointerException at de.uni_freiburg.informatik.ultimate.boogie.procedureinliner.backtranslation.InlinerBacktranslator.computeCurrectProc(InlinerBacktranslator.java:230) at de.uni_freiburg.informatik.ultimate.boogie.procedureinliner.backtranslation.InlinerBacktranslator.translateProgramExecution(InlinerBacktranslator.java:203) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ModelTranslationContainer.translateProgramExecution(ModelTranslationContainer.java:216) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ModelTranslationContainer.translateProgramExecution(ModelTranslationContainer.java:225) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ModelTranslationContainer.translateProgramExecution(ModelTranslationContainer.java:225) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ModelTranslationContainer.translateProgramExecution(ModelTranslationContainer.java:206) at de.uni_freiburg.informatik.ultimate.core.lib.results.CounterExampleResult.getProgramExecutionAsString(CounterExampleResult.java:155) at de.uni_freiburg.informatik.ultimate.core.lib.results.CounterExampleResult.getLongDescription(CounterExampleResult.java:134) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ResultService.reportResult(ResultService.java:86) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResultReporter.reportResult(CegarLoopResultReporter.java:141) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.reportLocationResults(TraceAbstractionStarter.java:586) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:181) 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) [2021-11-12 22:27:55,894 INFO L158 Benchmark]: Toolchain (without parser) took 22908.85ms. Allocated memory was 111.1MB in the beginning and 237.0MB in the end (delta: 125.8MB). Free memory was 75.6MB in the beginning and 129.2MB in the end (delta: -53.6MB). Peak memory consumption was 70.7MB. Max. memory is 16.1GB. [2021-11-12 22:27:55,894 INFO L158 Benchmark]: CDTParser took 0.27ms. Allocated memory is still 111.1MB. Free memory is still 92.6MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-12 22:27:55,895 INFO L158 Benchmark]: CACSL2BoogieTranslator took 243.20ms. Allocated memory is still 111.1MB. Free memory was 75.3MB in the beginning and 88.7MB in the end (delta: -13.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-12 22:27:55,895 INFO L158 Benchmark]: Boogie Procedure Inliner took 31.80ms. Allocated memory is still 111.1MB. Free memory was 88.4MB in the beginning and 87.0MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-12 22:27:55,896 INFO L158 Benchmark]: Boogie Preprocessor took 17.93ms. Allocated memory is still 111.1MB. Free memory was 87.0MB in the beginning and 86.2MB in the end (delta: 857.6kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-12 22:27:55,896 INFO L158 Benchmark]: RCFGBuilder took 298.08ms. Allocated memory is still 111.1MB. Free memory was 86.2MB in the beginning and 76.5MB in the end (delta: 9.6MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-12 22:27:55,897 INFO L158 Benchmark]: TraceAbstraction took 22301.34ms. Allocated memory was 111.1MB in the beginning and 237.0MB in the end (delta: 125.8MB). Free memory was 75.8MB in the beginning and 129.2MB in the end (delta: -53.4MB). Peak memory consumption was 73.6MB. Max. memory is 16.1GB. [2021-11-12 22:27:55,899 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27ms. Allocated memory is still 111.1MB. Free memory is still 92.6MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 243.20ms. Allocated memory is still 111.1MB. Free memory was 75.3MB in the beginning and 88.7MB in the end (delta: -13.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 31.80ms. Allocated memory is still 111.1MB. Free memory was 88.4MB in the beginning and 87.0MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 17.93ms. Allocated memory is still 111.1MB. Free memory was 87.0MB in the beginning and 86.2MB in the end (delta: 857.6kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 298.08ms. Allocated memory is still 111.1MB. Free memory was 86.2MB in the beginning and 76.5MB in the end (delta: 9.6MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 22301.34ms. Allocated memory was 111.1MB in the beginning and 237.0MB in the end (delta: 125.8MB). Free memory was 75.8MB in the beginning and 129.2MB in the end (delta: -53.4MB). Peak memory consumption was 73.6MB. Max. memory is 16.1GB. * 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 - ExceptionOrErrorResult: NullPointerException: null de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: NullPointerException: null: de.uni_freiburg.informatik.ultimate.boogie.procedureinliner.backtranslation.InlinerBacktranslator.computeCurrectProc(InlinerBacktranslator.java:230) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-12 22:27:55,947 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/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 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_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci05.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF --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 97829031814878890268a6b8dbba5c3e987e2ec78ab2dc94181f9e68090060bd --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 22:27:58,255 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 22:27:58,259 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 22:27:58,309 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 22:27:58,310 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 22:27:58,315 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 22:27:58,316 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 22:27:58,321 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 22:27:58,324 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 22:27:58,332 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 22:27:58,333 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 22:27:58,335 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 22:27:58,336 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 22:27:58,338 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 22:27:58,340 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 22:27:58,344 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 22:27:58,347 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 22:27:58,349 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 22:27:58,351 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 22:27:58,358 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 22:27:58,361 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 22:27:58,362 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 22:27:58,364 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 22:27:58,365 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 22:27:58,368 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 22:27:58,369 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 22:27:58,369 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 22:27:58,370 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 22:27:58,371 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 22:27:58,372 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 22:27:58,372 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 22:27:58,373 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 22:27:58,374 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 22:27:58,375 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 22:27:58,376 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 22:27:58,376 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 22:27:58,377 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 22:27:58,377 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 22:27:58,377 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 22:27:58,378 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 22:27:58,379 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 22:27:58,380 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-12 22:27:58,418 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 22:27:58,418 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 22:27:58,419 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 22:27:58,420 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 22:27:58,420 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 22:27:58,420 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 22:27:58,420 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 22:27:58,421 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 22:27:58,421 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 22:27:58,421 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 22:27:58,423 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 22:27:58,424 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 22:27:58,424 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 22:27:58,424 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 22:27:58,424 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 22:27:58,425 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 22:27:58,425 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 22:27:58,425 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 22:27:58,425 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-12 22:27:58,425 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-12 22:27:58,426 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 22:27:58,426 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 22:27:58,426 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 22:27:58,426 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 22:27:58,427 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 22:27:58,427 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-12 22:27:58,427 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 22:27:58,427 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:27:58,428 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 22:27:58,428 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 22:27:58,428 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 22:27:58,428 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-12 22:27:58,429 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-12 22:27:58,429 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 22:27:58,429 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 22:27:58,430 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 22:27:58,430 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_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 97829031814878890268a6b8dbba5c3e987e2ec78ab2dc94181f9e68090060bd [2021-11-12 22:27:58,827 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 22:27:58,856 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 22:27:58,860 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 22:27:58,862 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 22:27:58,864 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 22:27:58,865 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/recursive/Fibonacci05.c [2021-11-12 22:27:58,928 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/data/e2524c6f8/174c1cf5557241fa9a69bc30b6307552/FLAG2e18ad8e3 [2021-11-12 22:27:59,352 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 22:27:59,353 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/sv-benchmarks/c/recursive/Fibonacci05.c [2021-11-12 22:27:59,361 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/data/e2524c6f8/174c1cf5557241fa9a69bc30b6307552/FLAG2e18ad8e3 [2021-11-12 22:27:59,748 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/data/e2524c6f8/174c1cf5557241fa9a69bc30b6307552 [2021-11-12 22:27:59,750 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 22:27:59,751 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 22:27:59,753 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 22:27:59,753 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 22:27:59,756 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 22:27:59,757 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:27:59" (1/1) ... [2021-11-12 22:27:59,758 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27394bb2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:59, skipping insertion in model container [2021-11-12 22:27:59,759 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:27:59" (1/1) ... [2021-11-12 22:27:59,766 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 22:27:59,785 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 22:27:59,922 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_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/sv-benchmarks/c/recursive/Fibonacci05.c[746,759] [2021-11-12 22:27:59,925 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:27:59,938 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 22:27:59,961 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_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/sv-benchmarks/c/recursive/Fibonacci05.c[746,759] [2021-11-12 22:27:59,962 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:27:59,977 INFO L208 MainTranslator]: Completed translation [2021-11-12 22:27:59,978 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:59 WrapperNode [2021-11-12 22:27:59,979 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 22:27:59,980 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 22:27:59,980 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 22:27:59,980 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 22:27:59,987 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:59" (1/1) ... [2021-11-12 22:28:00,001 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:59" (1/1) ... [2021-11-12 22:28:00,018 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 22:28:00,020 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 22:28:00,020 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 22:28:00,020 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 22:28:00,028 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:59" (1/1) ... [2021-11-12 22:28:00,028 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:59" (1/1) ... [2021-11-12 22:28:00,041 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:59" (1/1) ... [2021-11-12 22:28:00,042 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:59" (1/1) ... [2021-11-12 22:28:00,054 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:59" (1/1) ... [2021-11-12 22:28:00,056 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:59" (1/1) ... [2021-11-12 22:28:00,058 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:59" (1/1) ... [2021-11-12 22:28:00,065 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 22:28:00,067 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 22:28:00,068 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 22:28:00,068 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 22:28:00,069 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:59" (1/1) ... [2021-11-12 22:28:00,077 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:28:00,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:28:00,107 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 22:28:00,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 22:28:00,160 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2021-11-12 22:28:00,161 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2021-11-12 22:28:00,161 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 22:28:00,161 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 22:28:00,161 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-12 22:28:00,161 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 22:28:00,465 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 22:28:00,465 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-12 22:28:00,467 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:28:00 BoogieIcfgContainer [2021-11-12 22:28:00,467 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 22:28:00,469 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 22:28:00,477 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 22:28:00,480 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 22:28:00,480 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 10:27:59" (1/3) ... [2021-11-12 22:28:00,481 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7795b07d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:28:00, skipping insertion in model container [2021-11-12 22:28:00,481 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:27:59" (2/3) ... [2021-11-12 22:28:00,481 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7795b07d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:28:00, skipping insertion in model container [2021-11-12 22:28:00,482 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:28:00" (3/3) ... [2021-11-12 22:28:00,483 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci05.c [2021-11-12 22:28:00,488 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 22:28:00,491 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-12 22:28:00,554 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 22:28:00,568 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 [2021-11-12 22:28:00,569 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-12 22:28:00,599 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-12 22:28:00,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-12 22:28:00,604 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:28:00,605 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:28:00,606 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:28:00,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:28:00,612 INFO L85 PathProgramCache]: Analyzing trace with hash 377493052, now seen corresponding path program 1 times [2021-11-12 22:28:00,625 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:28:00,625 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [308733560] [2021-11-12 22:28:00,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:28:00,626 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:28:00,627 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:28:00,632 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:28:00,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-12 22:28:00,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:28:00,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:28:00,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:00,834 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:28:00,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:01,043 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:28:01,044 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:28:01,044 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [308733560] [2021-11-12 22:28:01,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [308733560] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:28:01,045 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:28:01,045 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2021-11-12 22:28:01,047 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324480957] [2021-11-12 22:28:01,048 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:28:01,052 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 22:28:01,052 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:28:01,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 22:28:01,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:28:01,080 INFO L87 Difference]: Start difference. First operand has 18 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 8 states, 8 states have (on average 1.625) internal successors, (13), 8 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 22:28:01,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:28:01,200 INFO L93 Difference]: Finished difference Result 39 states and 49 transitions. [2021-11-12 22:28:01,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 22:28:01,207 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 8 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 10 [2021-11-12 22:28:01,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:28:01,221 INFO L225 Difference]: With dead ends: 39 [2021-11-12 22:28:01,229 INFO L226 Difference]: Without dead ends: 21 [2021-11-12 22:28:01,233 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-12 22:28:01,236 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 19 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 58.67ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.73ms SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 70.27ms IncrementalHoareTripleChecker+Time [2021-11-12 22:28:01,248 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 50 Invalid, 57 Unknown, 0 Unchecked, 2.73ms Time], IncrementalHoareTripleChecker [9 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 70.27ms Time] [2021-11-12 22:28:01,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-12 22:28:01,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-12 22:28:01,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 4 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-12 22:28:01,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 29 transitions. [2021-11-12 22:28:01,298 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 29 transitions. Word has length 10 [2021-11-12 22:28:01,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:28:01,299 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 29 transitions. [2021-11-12 22:28:01,299 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 8 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 22:28:01,299 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 29 transitions. [2021-11-12 22:28:01,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-12 22:28:01,302 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:28:01,302 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:28:01,317 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:01,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:28:01,513 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:28:01,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:28:01,514 INFO L85 PathProgramCache]: Analyzing trace with hash 841853224, now seen corresponding path program 1 times [2021-11-12 22:28:01,515 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:28:01,515 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1176842585] [2021-11-12 22:28:01,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:28:01,516 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:28:01,516 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:28:01,517 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:28:01,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-12 22:28:01,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:28:01,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:28:01,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:01,652 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:28:01,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:02,052 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:28:02,053 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:28:02,053 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1176842585] [2021-11-12 22:28:02,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1176842585] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:02,054 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1364171853] [2021-11-12 22:28:02,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:28:02,055 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:28:02,055 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:28:02,058 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:28:02,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (4)] Waiting until timeout for monitored process [2021-11-12 22:28:02,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:28:02,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-12 22:28:02,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:02,235 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:28:02,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:02,454 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:28:02,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1364171853] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:02,455 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [514756365] [2021-11-12 22:28:02,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:28:02,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:28:02,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:28:02,458 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:28:02,488 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-12 22:28:02,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:28:02,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:28:02,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:02,586 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-12 22:28:02,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:02,855 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:28:02,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [514756365] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:28:02,856 INFO L186 FreeRefinementEngine]: Found 2 perfect and 4 imperfect interpolant sequences. [2021-11-12 22:28:02,856 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 7] imperfect sequences [6, 7, 7, 7] total 15 [2021-11-12 22:28:02,857 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058797783] [2021-11-12 22:28:02,857 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:28:02,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-12 22:28:02,858 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:28:02,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-12 22:28:02,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2021-11-12 22:28:02,859 INFO L87 Difference]: Start difference. First operand 21 states and 29 transitions. Second operand has 9 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-12 22:28:03,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:28:03,157 INFO L93 Difference]: Finished difference Result 74 states and 198 transitions. [2021-11-12 22:28:03,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 22:28:03,158 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 24 [2021-11-12 22:28:03,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:28:03,163 INFO L225 Difference]: With dead ends: 74 [2021-11-12 22:28:03,164 INFO L226 Difference]: Without dead ends: 56 [2021-11-12 22:28:03,165 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=110, Invalid=270, Unknown=0, NotChecked=0, Total=380 [2021-11-12 22:28:03,167 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 29 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 177.20ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.29ms SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 203.94ms IncrementalHoareTripleChecker+Time [2021-11-12 22:28:03,168 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 59 Invalid, 197 Unknown, 0 Unchecked, 4.29ms Time], IncrementalHoareTripleChecker [62 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 203.94ms Time] [2021-11-12 22:28:03,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-12 22:28:03,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 44. [2021-11-12 22:28:03,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 25 states have (on average 1.16) internal successors, (29), 27 states have internal predecessors, (29), 10 states have call successors, (10), 2 states have call predecessors, (10), 8 states have return successors, (65), 14 states have call predecessors, (65), 10 states have call successors, (65) [2021-11-12 22:28:03,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 104 transitions. [2021-11-12 22:28:03,198 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 104 transitions. Word has length 24 [2021-11-12 22:28:03,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:28:03,199 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 104 transitions. [2021-11-12 22:28:03,200 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-12 22:28:03,200 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 104 transitions. [2021-11-12 22:28:03,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-12 22:28:03,205 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:28:03,205 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:28:03,241 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:03,433 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:03,625 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (4)] Ended with exit code 0 [2021-11-12 22:28:03,822 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:28:03,822 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:28:03,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:28:03,823 INFO L85 PathProgramCache]: Analyzing trace with hash 760869622, now seen corresponding path program 1 times [2021-11-12 22:28:03,823 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:28:03,824 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1807362451] [2021-11-12 22:28:03,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:28:03,824 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:28:03,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:28:03,832 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:28:03,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-12 22:28:03,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:28:03,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-12 22:28:03,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:04,010 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-12 22:28:04,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:04,265 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 14 proven. 9 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-12 22:28:04,265 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:28:04,266 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1807362451] [2021-11-12 22:28:04,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1807362451] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:28:04,266 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-12 22:28:04,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [6] total 10 [2021-11-12 22:28:04,266 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376967017] [2021-11-12 22:28:04,266 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:28:04,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-12 22:28:04,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:28:04,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-12 22:28:04,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2021-11-12 22:28:04,268 INFO L87 Difference]: Start difference. First operand 44 states and 104 transitions. Second operand has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 7 states have internal predecessors, (19), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 1 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-12 22:28:04,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:28:04,342 INFO L93 Difference]: Finished difference Result 83 states and 221 transitions. [2021-11-12 22:28:04,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 22:28:04,344 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 7 states have internal predecessors, (19), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 1 states have call predecessors, (4), 4 states have call successors, (4) Word has length 35 [2021-11-12 22:28:04,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:28:04,346 INFO L225 Difference]: With dead ends: 83 [2021-11-12 22:28:04,346 INFO L226 Difference]: Without dead ends: 42 [2021-11-12 22:28:04,349 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2021-11-12 22:28:04,350 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 9 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 45.50ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.92ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 53.89ms IncrementalHoareTripleChecker+Time [2021-11-12 22:28:04,353 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 40 Invalid, 43 Unknown, 0 Unchecked, 0.92ms Time], IncrementalHoareTripleChecker [3 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 53.89ms Time] [2021-11-12 22:28:04,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-12 22:28:04,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-11-12 22:28:04,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 25 states have (on average 1.16) internal successors, (29), 27 states have internal predecessors, (29), 8 states have call successors, (8), 2 states have call predecessors, (8), 8 states have return successors, (49), 12 states have call predecessors, (49), 8 states have call successors, (49) [2021-11-12 22:28:04,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 86 transitions. [2021-11-12 22:28:04,386 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 86 transitions. Word has length 35 [2021-11-12 22:28:04,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:28:04,386 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 86 transitions. [2021-11-12 22:28:04,387 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 7 states have internal predecessors, (19), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 1 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-12 22:28:04,387 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 86 transitions. [2021-11-12 22:28:04,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-12 22:28:04,396 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:28:04,396 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:28:04,410 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:04,599 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:28:04,599 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:28:04,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:28:04,600 INFO L85 PathProgramCache]: Analyzing trace with hash 1481106390, now seen corresponding path program 2 times [2021-11-12 22:28:04,600 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:28:04,600 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [131875319] [2021-11-12 22:28:04,601 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:28:04,601 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:28:04,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:28:04,602 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:28:04,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-12 22:28:04,659 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:28:04,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:28:04,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-12 22:28:04,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:04,797 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 23 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-12 22:28:04,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:05,163 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-12 22:28:05,163 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:28:05,163 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [131875319] [2021-11-12 22:28:05,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [131875319] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:05,164 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [689284447] [2021-11-12 22:28:05,164 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:28:05,164 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:28:05,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:28:05,165 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:28:05,185 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (8)] Waiting until timeout for monitored process [2021-11-12 22:28:05,272 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:28:05,273 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:28:05,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-12 22:28:05,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:05,380 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 23 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-12 22:28:05,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:05,687 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-12 22:28:05,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [689284447] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:05,688 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1863314353] [2021-11-12 22:28:05,688 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:28:05,689 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:28:05,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:28:05,694 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:28:05,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-12 22:28:05,760 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:28:05,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:28:05,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:28:05,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:05,850 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 19 proven. 8 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-12 22:28:05,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:06,038 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 19 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-12 22:28:06,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1863314353] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:06,039 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:28:06,039 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 7, 9, 6, 7] total 12 [2021-11-12 22:28:06,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495240492] [2021-11-12 22:28:06,040 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:28:06,041 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-12 22:28:06,041 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:28:06,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-12 22:28:06,042 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:28:06,042 INFO L87 Difference]: Start difference. First operand 42 states and 86 transitions. Second operand has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 7 states have call successors, (11), 1 states have call predecessors, (11), 5 states have return successors, (15), 8 states have call predecessors, (15), 7 states have call successors, (15) [2021-11-12 22:28:06,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:28:06,310 INFO L93 Difference]: Finished difference Result 99 states and 255 transitions. [2021-11-12 22:28:06,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-12 22:28:06,311 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 7 states have call successors, (11), 1 states have call predecessors, (11), 5 states have return successors, (15), 8 states have call predecessors, (15), 7 states have call successors, (15) Word has length 36 [2021-11-12 22:28:06,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:28:06,314 INFO L225 Difference]: With dead ends: 99 [2021-11-12 22:28:06,314 INFO L226 Difference]: Without dead ends: 56 [2021-11-12 22:28:06,315 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=172, Unknown=0, NotChecked=0, Total=240 [2021-11-12 22:28:06,316 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 36 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 161.93ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.99ms SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 210.13ms IncrementalHoareTripleChecker+Time [2021-11-12 22:28:06,317 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 79 Invalid, 258 Unknown, 0 Unchecked, 3.99ms Time], IncrementalHoareTripleChecker [51 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 210.13ms Time] [2021-11-12 22:28:06,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-12 22:28:06,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 46. [2021-11-12 22:28:06,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 29 states have internal predecessors, (32), 9 states have call successors, (9), 3 states have call predecessors, (9), 8 states have return successors, (40), 13 states have call predecessors, (40), 9 states have call successors, (40) [2021-11-12 22:28:06,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 81 transitions. [2021-11-12 22:28:06,339 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 81 transitions. Word has length 36 [2021-11-12 22:28:06,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:28:06,340 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 81 transitions. [2021-11-12 22:28:06,340 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 7 states have call successors, (11), 1 states have call predecessors, (11), 5 states have return successors, (15), 8 states have call predecessors, (15), 7 states have call successors, (15) [2021-11-12 22:28:06,340 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 81 transitions. [2021-11-12 22:28:06,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-12 22:28:06,349 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:28:06,350 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 18, 11, 11, 11, 11, 11, 11, 7, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:28:06,352 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (8)] Ended with exit code 0 [2021-11-12 22:28:06,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:06,773 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:06,954 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:28:06,955 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:28:06,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:28:06,956 INFO L85 PathProgramCache]: Analyzing trace with hash -1591710838, now seen corresponding path program 3 times [2021-11-12 22:28:06,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:28:06,956 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1423187463] [2021-11-12 22:28:06,957 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:28:06,957 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:28:06,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:28:06,958 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:28:06,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-12 22:28:07,064 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-12 22:28:07,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:28:07,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 22:28:07,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:07,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1330 backedges. 413 proven. 100 refuted. 0 times theorem prover too weak. 817 trivial. 0 not checked. [2021-11-12 22:28:07,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:08,395 INFO L134 CoverageAnalysis]: Checked inductivity of 1330 backedges. 422 proven. 113 refuted. 0 times theorem prover too weak. 795 trivial. 0 not checked. [2021-11-12 22:28:08,395 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:28:08,396 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1423187463] [2021-11-12 22:28:08,396 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1423187463] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:08,396 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [731563675] [2021-11-12 22:28:08,396 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:28:08,396 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:28:08,396 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:28:08,397 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:28:08,401 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-12 22:28:08,579 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-12 22:28:08,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:28:08,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 22:28:08,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:08,834 INFO L134 CoverageAnalysis]: Checked inductivity of 1330 backedges. 413 proven. 100 refuted. 0 times theorem prover too weak. 817 trivial. 0 not checked. [2021-11-12 22:28:08,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:09,780 INFO L134 CoverageAnalysis]: Checked inductivity of 1330 backedges. 422 proven. 113 refuted. 0 times theorem prover too weak. 795 trivial. 0 not checked. [2021-11-12 22:28:09,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [731563675] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:09,781 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [728044859] [2021-11-12 22:28:09,781 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:28:09,781 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:28:09,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:28:09,782 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:28:09,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-12 22:28:09,895 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-12 22:28:09,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:28:09,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-12 22:28:09,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:10,232 INFO L134 CoverageAnalysis]: Checked inductivity of 1330 backedges. 507 proven. 106 refuted. 0 times theorem prover too weak. 717 trivial. 0 not checked. [2021-11-12 22:28:10,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:11,371 INFO L134 CoverageAnalysis]: Checked inductivity of 1330 backedges. 422 proven. 113 refuted. 0 times theorem prover too weak. 795 trivial. 0 not checked. [2021-11-12 22:28:11,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [728044859] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:11,372 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:28:11,372 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 8, 11, 9, 11] total 15 [2021-11-12 22:28:11,372 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954476016] [2021-11-12 22:28:11,373 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:28:11,374 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-12 22:28:11,375 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:28:11,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-12 22:28:11,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2021-11-12 22:28:11,376 INFO L87 Difference]: Start difference. First operand 46 states and 81 transitions. Second operand has 15 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 9 states have call successors, (14), 1 states have call predecessors, (14), 7 states have return successors, (20), 12 states have call predecessors, (20), 9 states have call successors, (20) [2021-11-12 22:28:11,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:28:11,746 INFO L93 Difference]: Finished difference Result 117 states and 274 transitions. [2021-11-12 22:28:11,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-12 22:28:11,747 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 9 states have call successors, (14), 1 states have call predecessors, (14), 7 states have return successors, (20), 12 states have call predecessors, (20), 9 states have call successors, (20) Word has length 149 [2021-11-12 22:28:11,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:28:11,750 INFO L225 Difference]: With dead ends: 117 [2021-11-12 22:28:11,750 INFO L226 Difference]: Without dead ends: 73 [2021-11-12 22:28:11,751 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 894 GetRequests, 875 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=125, Invalid=295, Unknown=0, NotChecked=0, Total=420 [2021-11-12 22:28:11,752 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 79 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 208.14ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 406 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.47ms SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 281.00ms IncrementalHoareTripleChecker+Time [2021-11-12 22:28:11,752 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 82 Invalid, 406 Unknown, 0 Unchecked, 3.47ms Time], IncrementalHoareTripleChecker [140 Valid, 266 Invalid, 0 Unknown, 0 Unchecked, 281.00ms Time] [2021-11-12 22:28:11,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-11-12 22:28:11,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 55. [2021-11-12 22:28:11,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 33 states have (on average 1.121212121212121) internal successors, (37), 34 states have internal predecessors, (37), 12 states have call successors, (12), 4 states have call predecessors, (12), 9 states have return successors, (47), 16 states have call predecessors, (47), 12 states have call successors, (47) [2021-11-12 22:28:11,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 96 transitions. [2021-11-12 22:28:11,782 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 96 transitions. Word has length 149 [2021-11-12 22:28:11,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:28:11,784 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 96 transitions. [2021-11-12 22:28:11,786 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 9 states have call successors, (14), 1 states have call predecessors, (14), 7 states have return successors, (20), 12 states have call predecessors, (20), 9 states have call successors, (20) [2021-11-12 22:28:11,789 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 96 transitions. [2021-11-12 22:28:11,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-12 22:28:11,795 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:28:11,795 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 16, 10, 10, 10, 10, 10, 10, 6, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:28:11,810 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:12,008 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:12,227 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:12,407 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:28:12,407 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:28:12,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:28:12,407 INFO L85 PathProgramCache]: Analyzing trace with hash -1467556110, now seen corresponding path program 4 times [2021-11-12 22:28:12,408 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:28:12,408 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1933073520] [2021-11-12 22:28:12,408 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:28:12,408 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:28:12,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:28:12,410 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:28:12,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-12 22:28:12,506 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:28:12,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:28:12,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-12 22:28:12,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:12,876 INFO L134 CoverageAnalysis]: Checked inductivity of 1095 backedges. 184 proven. 365 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2021-11-12 22:28:12,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:13,996 INFO L134 CoverageAnalysis]: Checked inductivity of 1095 backedges. 197 proven. 393 refuted. 0 times theorem prover too weak. 505 trivial. 0 not checked. [2021-11-12 22:28:13,997 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:28:13,997 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1933073520] [2021-11-12 22:28:13,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1933073520] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:13,997 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [192450070] [2021-11-12 22:28:13,997 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:28:13,997 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:28:13,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:28:13,998 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:28:13,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-12 22:28:14,136 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:28:14,136 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:28:14,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-12 22:28:14,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:14,440 INFO L134 CoverageAnalysis]: Checked inductivity of 1095 backedges. 184 proven. 365 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2021-11-12 22:28:14,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:15,526 INFO L134 CoverageAnalysis]: Checked inductivity of 1095 backedges. 197 proven. 393 refuted. 0 times theorem prover too weak. 505 trivial. 0 not checked. [2021-11-12 22:28:15,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [192450070] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:15,527 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1860937460] [2021-11-12 22:28:15,527 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:28:15,527 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:28:15,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:28:15,529 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:28:15,553 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-12 22:28:15,620 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:28:15,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:28:15,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-12 22:28:15,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:16,005 INFO L134 CoverageAnalysis]: Checked inductivity of 1095 backedges. 281 proven. 309 refuted. 0 times theorem prover too weak. 505 trivial. 0 not checked. [2021-11-12 22:28:16,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:17,200 INFO L134 CoverageAnalysis]: Checked inductivity of 1095 backedges. 324 proven. 70 refuted. 0 times theorem prover too weak. 701 trivial. 0 not checked. [2021-11-12 22:28:17,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1860937460] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:17,201 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:28:17,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17, 12, 17, 12, 11] total 27 [2021-11-12 22:28:17,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123951321] [2021-11-12 22:28:17,202 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:28:17,203 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-12 22:28:17,204 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:28:17,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-12 22:28:17,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=545, Unknown=0, NotChecked=0, Total=702 [2021-11-12 22:28:17,205 INFO L87 Difference]: Start difference. First operand 55 states and 96 transitions. Second operand has 27 states, 23 states have (on average 2.869565217391304) internal successors, (66), 24 states have internal predecessors, (66), 20 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (35), 14 states have call predecessors, (35), 20 states have call successors, (35) [2021-11-12 22:28:17,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:28:17,658 INFO L93 Difference]: Finished difference Result 116 states and 227 transitions. [2021-11-12 22:28:17,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-12 22:28:17,660 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 23 states have (on average 2.869565217391304) internal successors, (66), 24 states have internal predecessors, (66), 20 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (35), 14 states have call predecessors, (35), 20 states have call successors, (35) Word has length 136 [2021-11-12 22:28:17,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:28:17,661 INFO L225 Difference]: With dead ends: 116 [2021-11-12 22:28:17,661 INFO L226 Difference]: Without dead ends: 62 [2021-11-12 22:28:17,662 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 785 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 246 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=312, Invalid=878, Unknown=0, NotChecked=0, Total=1190 [2021-11-12 22:28:17,663 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 174 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 276 mSolverCounterSat, 199 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 246.71ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 475 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.62ms SdHoareTripleChecker+Time, 199 IncrementalHoareTripleChecker+Valid, 276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 291.46ms IncrementalHoareTripleChecker+Time [2021-11-12 22:28:17,664 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [181 Valid, 134 Invalid, 475 Unknown, 0 Unchecked, 3.62ms Time], IncrementalHoareTripleChecker [199 Valid, 276 Invalid, 0 Unknown, 0 Unchecked, 291.46ms Time] [2021-11-12 22:28:17,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-12 22:28:17,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 55. [2021-11-12 22:28:17,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 35 states have internal predecessors, (38), 10 states have call successors, (10), 6 states have call predecessors, (10), 8 states have return successors, (26), 13 states have call predecessors, (26), 10 states have call successors, (26) [2021-11-12 22:28:17,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 74 transitions. [2021-11-12 22:28:17,674 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 74 transitions. Word has length 136 [2021-11-12 22:28:17,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:28:17,674 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 74 transitions. [2021-11-12 22:28:17,675 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 23 states have (on average 2.869565217391304) internal successors, (66), 24 states have internal predecessors, (66), 20 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (35), 14 states have call predecessors, (35), 20 states have call successors, (35) [2021-11-12 22:28:17,675 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 74 transitions. [2021-11-12 22:28:17,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2021-11-12 22:28:17,677 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:28:17,677 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 20, 12, 12, 12, 12, 12, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:28:17,684 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:17,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:18,086 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:18,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:28:18,280 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:28:18,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:28:18,280 INFO L85 PathProgramCache]: Analyzing trace with hash 1243171980, now seen corresponding path program 5 times [2021-11-12 22:28:18,280 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:28:18,280 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1367215847] [2021-11-12 22:28:18,280 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-12 22:28:18,280 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:28:18,281 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:28:18,281 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:28:18,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-12 22:28:18,412 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-11-12 22:28:18,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:28:18,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 22:28:18,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:18,697 INFO L134 CoverageAnalysis]: Checked inductivity of 1588 backedges. 305 proven. 109 refuted. 0 times theorem prover too weak. 1174 trivial. 0 not checked. [2021-11-12 22:28:18,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:19,441 INFO L134 CoverageAnalysis]: Checked inductivity of 1588 backedges. 306 proven. 124 refuted. 0 times theorem prover too weak. 1158 trivial. 0 not checked. [2021-11-12 22:28:19,441 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:28:19,441 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1367215847] [2021-11-12 22:28:19,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1367215847] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:19,442 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1282952050] [2021-11-12 22:28:19,442 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-12 22:28:19,442 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:28:19,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:28:19,446 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:28:19,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-12 22:28:19,646 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-11-12 22:28:19,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:28:19,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 22:28:19,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:19,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1588 backedges. 305 proven. 109 refuted. 0 times theorem prover too weak. 1174 trivial. 0 not checked. [2021-11-12 22:28:19,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:20,542 INFO L134 CoverageAnalysis]: Checked inductivity of 1588 backedges. 306 proven. 124 refuted. 0 times theorem prover too weak. 1158 trivial. 0 not checked. [2021-11-12 22:28:20,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1282952050] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:20,544 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [375799656] [2021-11-12 22:28:20,544 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-12 22:28:20,544 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:28:20,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:28:20,545 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:28:20,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-12 22:28:20,670 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-11-12 22:28:20,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:28:20,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-12 22:28:20,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:20,997 INFO L134 CoverageAnalysis]: Checked inductivity of 1588 backedges. 381 proven. 247 refuted. 0 times theorem prover too weak. 960 trivial. 0 not checked. [2021-11-12 22:28:20,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:21,895 INFO L134 CoverageAnalysis]: Checked inductivity of 1588 backedges. 306 proven. 124 refuted. 0 times theorem prover too weak. 1158 trivial. 0 not checked. [2021-11-12 22:28:21,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [375799656] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:21,895 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:28:21,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 8, 11, 10, 11] total 16 [2021-11-12 22:28:21,896 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9904178] [2021-11-12 22:28:21,896 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:28:21,897 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-12 22:28:21,898 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:28:21,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-12 22:28:21,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2021-11-12 22:28:21,899 INFO L87 Difference]: Start difference. First operand 55 states and 74 transitions. Second operand has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 15 states have internal predecessors, (41), 7 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (17), 12 states have call predecessors, (17), 7 states have call successors, (17) [2021-11-12 22:28:22,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:28:22,264 INFO L93 Difference]: Finished difference Result 165 states and 309 transitions. [2021-11-12 22:28:22,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-12 22:28:22,265 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 15 states have internal predecessors, (41), 7 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (17), 12 states have call predecessors, (17), 7 states have call successors, (17) Word has length 162 [2021-11-12 22:28:22,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:28:22,268 INFO L225 Difference]: With dead ends: 165 [2021-11-12 22:28:22,268 INFO L226 Difference]: Without dead ends: 94 [2021-11-12 22:28:22,269 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 971 GetRequests, 952 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=316, Unknown=0, NotChecked=0, Total=420 [2021-11-12 22:28:22,270 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 26 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 410 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 226.10ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.25ms SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 410 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 300.86ms IncrementalHoareTripleChecker+Time [2021-11-12 22:28:22,271 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 141 Invalid, 490 Unknown, 0 Unchecked, 3.25ms Time], IncrementalHoareTripleChecker [80 Valid, 410 Invalid, 0 Unknown, 0 Unchecked, 300.86ms Time] [2021-11-12 22:28:22,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-12 22:28:22,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 78. [2021-11-12 22:28:22,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 50 states have internal predecessors, (55), 15 states have call successors, (15), 9 states have call predecessors, (15), 11 states have return successors, (44), 18 states have call predecessors, (44), 15 states have call successors, (44) [2021-11-12 22:28:22,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 114 transitions. [2021-11-12 22:28:22,285 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 114 transitions. Word has length 162 [2021-11-12 22:28:22,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:28:22,285 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 114 transitions. [2021-11-12 22:28:22,286 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 15 states have internal predecessors, (41), 7 states have call successors, (12), 1 states have call predecessors, (12), 7 states have return successors, (17), 12 states have call predecessors, (17), 7 states have call successors, (17) [2021-11-12 22:28:22,286 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 114 transitions. [2021-11-12 22:28:22,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 453 [2021-11-12 22:28:22,299 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:28:22,299 INFO L514 BasicCegarLoop]: trace histogram [71, 71, 57, 35, 35, 35, 35, 35, 35, 22, 14, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:28:22,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:22,533 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:22,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:22,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:28:22,912 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:28:22,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:28:22,913 INFO L85 PathProgramCache]: Analyzing trace with hash -344330968, now seen corresponding path program 6 times [2021-11-12 22:28:22,914 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:28:22,914 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [880086432] [2021-11-12 22:28:22,914 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-12 22:28:22,914 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:28:22,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:28:22,915 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:28:22,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-12 22:28:23,439 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 53 check-sat command(s) [2021-11-12 22:28:23,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:28:23,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-12 22:28:23,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:24,084 INFO L134 CoverageAnalysis]: Checked inductivity of 13321 backedges. 2104 proven. 119 refuted. 0 times theorem prover too weak. 11098 trivial. 0 not checked. [2021-11-12 22:28:24,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:26,181 INFO L134 CoverageAnalysis]: Checked inductivity of 13321 backedges. 2112 proven. 143 refuted. 0 times theorem prover too weak. 11066 trivial. 0 not checked. [2021-11-12 22:28:26,182 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:28:26,182 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [880086432] [2021-11-12 22:28:26,182 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [880086432] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:26,182 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1457750833] [2021-11-12 22:28:26,182 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-12 22:28:26,182 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:28:26,183 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:28:26,186 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:28:26,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-11-12 22:28:26,768 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 53 check-sat command(s) [2021-11-12 22:28:26,768 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:28:26,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-12 22:28:26,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:27,429 INFO L134 CoverageAnalysis]: Checked inductivity of 13321 backedges. 2104 proven. 119 refuted. 0 times theorem prover too weak. 11098 trivial. 0 not checked. [2021-11-12 22:28:27,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:29,265 INFO L134 CoverageAnalysis]: Checked inductivity of 13321 backedges. 2112 proven. 143 refuted. 0 times theorem prover too weak. 11066 trivial. 0 not checked. [2021-11-12 22:28:29,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1457750833] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:29,266 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [967405678] [2021-11-12 22:28:29,266 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-12 22:28:29,266 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:28:29,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:28:29,267 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:28:29,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-12 22:28:29,760 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 53 check-sat command(s) [2021-11-12 22:28:29,761 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:28:29,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-12 22:28:29,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:28:30,397 INFO L134 CoverageAnalysis]: Checked inductivity of 13321 backedges. 2104 proven. 119 refuted. 0 times theorem prover too weak. 11098 trivial. 0 not checked. [2021-11-12 22:28:30,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:28:32,315 INFO L134 CoverageAnalysis]: Checked inductivity of 13321 backedges. 2112 proven. 143 refuted. 0 times theorem prover too weak. 11066 trivial. 0 not checked. [2021-11-12 22:28:32,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [967405678] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:28:32,315 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:28:32,316 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 8, 11, 8, 11] total 14 [2021-11-12 22:28:32,316 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182169532] [2021-11-12 22:28:32,316 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:28:32,318 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-12 22:28:32,319 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:28:32,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-12 22:28:32,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2021-11-12 22:28:32,319 INFO L87 Difference]: Start difference. First operand 78 states and 114 transitions. Second operand has 14 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 8 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (18), 11 states have call predecessors, (18), 8 states have call successors, (18) [2021-11-12 22:28:32,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:28:32,647 INFO L93 Difference]: Finished difference Result 197 states and 405 transitions. [2021-11-12 22:28:32,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-12 22:28:32,648 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 8 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (18), 11 states have call predecessors, (18), 8 states have call successors, (18) Word has length 452 [2021-11-12 22:28:32,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:28:32,651 INFO L225 Difference]: With dead ends: 197 [2021-11-12 22:28:32,652 INFO L226 Difference]: Without dead ends: 119 [2021-11-12 22:28:32,653 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2714 GetRequests, 2694 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=136, Invalid=326, Unknown=0, NotChecked=0, Total=462 [2021-11-12 22:28:32,654 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 30 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 280 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 192.97ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.27ms SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 225.54ms IncrementalHoareTripleChecker+Time [2021-11-12 22:28:32,654 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 109 Invalid, 377 Unknown, 0 Unchecked, 2.27ms Time], IncrementalHoareTripleChecker [97 Valid, 280 Invalid, 0 Unknown, 0 Unchecked, 225.54ms Time] [2021-11-12 22:28:32,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-12 22:28:32,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 106. [2021-11-12 22:28:32,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 68 states have (on average 1.0588235294117647) internal successors, (72), 67 states have internal predecessors, (72), 19 states have call successors, (19), 10 states have call predecessors, (19), 18 states have return successors, (98), 28 states have call predecessors, (98), 19 states have call successors, (98) [2021-11-12 22:28:32,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 189 transitions. [2021-11-12 22:28:32,672 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 189 transitions. Word has length 452 [2021-11-12 22:28:32,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:28:32,674 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 189 transitions. [2021-11-12 22:28:32,674 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 8 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (18), 11 states have call predecessors, (18), 8 states have call successors, (18) [2021-11-12 22:28:32,674 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 189 transitions. [2021-11-12 22:28:32,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 428 [2021-11-12 22:28:32,685 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:28:32,685 INFO L514 BasicCegarLoop]: trace histogram [67, 67, 54, 33, 33, 33, 33, 33, 33, 21, 13, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:28:32,705 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:32,927 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:33,103 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (20)] Ended with exit code 0 [2021-11-12 22:28:33,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:28:33,301 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:28:33,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:28:33,301 INFO L85 PathProgramCache]: Analyzing trace with hash 981211166, now seen corresponding path program 7 times [2021-11-12 22:28:33,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:28:33,302 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1804271409] [2021-11-12 22:28:33,303 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 22:28:33,303 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:28:33,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:28:33,304 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:28:33,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-12 22:28:33,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-12 22:28:33,641 INFO L355 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-12 22:28:33,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-12 22:28:34,269 INFO L133 FreeRefinementEngine]: Strategy WALRUS found a feasible trace [2021-11-12 22:28:34,269 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-11-12 22:28:34,270 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-12 22:28:34,289 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-12 22:28:34,489 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:28:34,492 INFO L732 BasicCegarLoop]: Path program histogram: [7, 1, 1] [2021-11-12 22:28:34,497 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-12 22:28:34,579 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.NullPointerException at de.uni_freiburg.informatik.ultimate.boogie.procedureinliner.backtranslation.InlinerBacktranslator.computeCurrectProc(InlinerBacktranslator.java:230) at de.uni_freiburg.informatik.ultimate.boogie.procedureinliner.backtranslation.InlinerBacktranslator.translateProgramExecution(InlinerBacktranslator.java:203) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ModelTranslationContainer.translateProgramExecution(ModelTranslationContainer.java:216) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ModelTranslationContainer.translateProgramExecution(ModelTranslationContainer.java:225) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ModelTranslationContainer.translateProgramExecution(ModelTranslationContainer.java:225) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ModelTranslationContainer.translateProgramExecution(ModelTranslationContainer.java:206) at de.uni_freiburg.informatik.ultimate.core.lib.results.CounterExampleResult.getProgramExecutionAsString(CounterExampleResult.java:155) at de.uni_freiburg.informatik.ultimate.core.lib.results.CounterExampleResult.getLongDescription(CounterExampleResult.java:134) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ResultService.reportResult(ResultService.java:86) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResultReporter.reportResult(CegarLoopResultReporter.java:141) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.reportLocationResults(TraceAbstractionStarter.java:586) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:181) 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) [2021-11-12 22:28:34,582 INFO L158 Benchmark]: Toolchain (without parser) took 34830.22ms. Allocated memory was 75.5MB in the beginning and 161.5MB in the end (delta: 86.0MB). Free memory was 41.5MB in the beginning and 76.6MB in the end (delta: -35.1MB). Peak memory consumption was 50.7MB. Max. memory is 16.1GB. [2021-11-12 22:28:34,582 INFO L158 Benchmark]: CDTParser took 0.26ms. Allocated memory is still 75.5MB. Free memory is still 57.7MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-12 22:28:34,582 INFO L158 Benchmark]: CACSL2BoogieTranslator took 226.30ms. Allocated memory is still 75.5MB. Free memory was 41.3MB in the beginning and 59.8MB in the end (delta: -18.5MB). Peak memory consumption was 6.6MB. Max. memory is 16.1GB. [2021-11-12 22:28:34,582 INFO L158 Benchmark]: Boogie Procedure Inliner took 38.70ms. Allocated memory is still 75.5MB. Free memory was 59.6MB in the beginning and 58.4MB in the end (delta: 1.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-12 22:28:34,583 INFO L158 Benchmark]: Boogie Preprocessor took 46.35ms. Allocated memory is still 75.5MB. Free memory was 58.2MB in the beginning and 57.3MB in the end (delta: 918.5kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-12 22:28:34,583 INFO L158 Benchmark]: RCFGBuilder took 400.71ms. Allocated memory is still 75.5MB. Free memory was 57.3MB in the beginning and 47.7MB in the end (delta: 9.6MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-12 22:28:34,583 INFO L158 Benchmark]: TraceAbstraction took 34112.08ms. Allocated memory was 75.5MB in the beginning and 161.5MB in the end (delta: 86.0MB). Free memory was 47.3MB in the beginning and 76.6MB in the end (delta: -29.3MB). Peak memory consumption was 58.8MB. Max. memory is 16.1GB. [2021-11-12 22:28:34,585 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26ms. Allocated memory is still 75.5MB. Free memory is still 57.7MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 226.30ms. Allocated memory is still 75.5MB. Free memory was 41.3MB in the beginning and 59.8MB in the end (delta: -18.5MB). Peak memory consumption was 6.6MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 38.70ms. Allocated memory is still 75.5MB. Free memory was 59.6MB in the beginning and 58.4MB in the end (delta: 1.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 46.35ms. Allocated memory is still 75.5MB. Free memory was 58.2MB in the beginning and 57.3MB in the end (delta: 918.5kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 400.71ms. Allocated memory is still 75.5MB. Free memory was 57.3MB in the beginning and 47.7MB in the end (delta: 9.6MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 34112.08ms. Allocated memory was 75.5MB in the beginning and 161.5MB in the end (delta: 86.0MB). Free memory was 47.3MB in the beginning and 76.6MB in the end (delta: -29.3MB). Peak memory consumption was 58.8MB. Max. memory is 16.1GB. * 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 - ExceptionOrErrorResult: NullPointerException: null de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: NullPointerException: null: de.uni_freiburg.informatik.ultimate.boogie.procedureinliner.backtranslation.InlinerBacktranslator.computeCurrectProc(InlinerBacktranslator.java:230) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-12 22:28:34,611 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd6a7783-76a0-45e5-8024-0f0ecbc1374c/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: ERROR: ExceptionOrErrorResult: NullPointerException: null