./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/in-de61.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/in-de61.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU --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 Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 49b7efdcf8f4d6c873493bd370328870547a88b20d287c5de5342268b0966917 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-02 22:38:19,773 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-02 22:38:19,775 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-02 22:38:19,820 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-02 22:38:19,821 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-02 22:38:19,822 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-02 22:38:19,825 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-02 22:38:19,828 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-02 22:38:19,831 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-02 22:38:19,833 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-02 22:38:19,834 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-02 22:38:19,836 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-02 22:38:19,837 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-02 22:38:19,839 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-02 22:38:19,841 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-02 22:38:19,843 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-02 22:38:19,845 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-02 22:38:19,847 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-02 22:38:19,849 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-02 22:38:19,853 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-02 22:38:19,855 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-02 22:38:19,857 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-02 22:38:19,859 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-02 22:38:19,860 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-02 22:38:19,865 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-02 22:38:19,866 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-02 22:38:19,866 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-02 22:38:19,867 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-02 22:38:19,879 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-02 22:38:19,881 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-02 22:38:19,881 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-02 22:38:19,882 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-02 22:38:19,884 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-02 22:38:19,885 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-02 22:38:19,886 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-02 22:38:19,887 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-02 22:38:19,888 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-02 22:38:19,888 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-02 22:38:19,890 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-02 22:38:19,891 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-02 22:38:19,893 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-02 22:38:19,895 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-02 22:38:19,942 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-02 22:38:19,942 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-02 22:38:19,943 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-02 22:38:19,950 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-02 22:38:19,952 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-02 22:38:19,952 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-02 22:38:19,953 INFO L138 SettingsManager]: * Use SBE=true [2021-11-02 22:38:19,953 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-02 22:38:19,953 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-02 22:38:19,954 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-02 22:38:19,955 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-02 22:38:19,955 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-02 22:38:19,956 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-02 22:38:19,956 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-02 22:38:19,956 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-02 22:38:19,956 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-02 22:38:19,957 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-02 22:38:19,957 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-02 22:38:19,957 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-02 22:38:19,957 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-02 22:38:19,958 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-02 22:38:19,958 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-02 22:38:19,958 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:38:19,959 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-02 22:38:19,959 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-02 22:38:19,959 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-02 22:38:19,959 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-02 22:38:19,960 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-02 22:38:19,960 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-02 22:38:19,962 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-02 22:38:19,962 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-02 22:38:19,962 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-02 22:38:19,963 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 49b7efdcf8f4d6c873493bd370328870547a88b20d287c5de5342268b0966917 [2021-11-02 22:38:20,327 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-02 22:38:20,351 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-02 22:38:20,354 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-02 22:38:20,355 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-02 22:38:20,356 INFO L275 PluginConnector]: CDTParser initialized [2021-11-02 22:38:20,357 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/../../sv-benchmarks/c/loops-crafted-1/in-de61.c [2021-11-02 22:38:20,483 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/data/30b9ec394/3ba88ade2cc4458889f01e1086e604e0/FLAGa169a5442 [2021-11-02 22:38:20,987 INFO L306 CDTParser]: Found 1 translation units. [2021-11-02 22:38:20,987 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/sv-benchmarks/c/loops-crafted-1/in-de61.c [2021-11-02 22:38:21,000 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/data/30b9ec394/3ba88ade2cc4458889f01e1086e604e0/FLAGa169a5442 [2021-11-02 22:38:21,341 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/data/30b9ec394/3ba88ade2cc4458889f01e1086e604e0 [2021-11-02 22:38:21,345 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-02 22:38:21,347 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-02 22:38:21,349 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-02 22:38:21,349 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-02 22:38:21,354 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-02 22:38:21,355 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:38:21" (1/1) ... [2021-11-02 22:38:21,356 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ab057ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:38:21, skipping insertion in model container [2021-11-02 22:38:21,357 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:38:21" (1/1) ... [2021-11-02 22:38:21,365 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-02 22:38:21,381 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-02 22:38:21,551 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_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/sv-benchmarks/c/loops-crafted-1/in-de61.c[368,381] [2021-11-02 22:38:21,569 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:38:21,588 INFO L203 MainTranslator]: Completed pre-run [2021-11-02 22:38:21,613 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_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/sv-benchmarks/c/loops-crafted-1/in-de61.c[368,381] [2021-11-02 22:38:21,621 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:38:21,637 INFO L208 MainTranslator]: Completed translation [2021-11-02 22:38:21,638 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:38:21 WrapperNode [2021-11-02 22:38:21,638 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-02 22:38:21,640 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-02 22:38:21,640 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-02 22:38:21,640 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-02 22:38:21,650 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:38:21" (1/1) ... [2021-11-02 22:38:21,658 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:38:21" (1/1) ... [2021-11-02 22:38:21,681 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-02 22:38:21,682 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-02 22:38:21,682 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-02 22:38:21,683 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-02 22:38:21,694 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:38:21" (1/1) ... [2021-11-02 22:38:21,700 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:38:21" (1/1) ... [2021-11-02 22:38:21,703 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:38:21" (1/1) ... [2021-11-02 22:38:21,705 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:38:21" (1/1) ... [2021-11-02 22:38:21,711 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:38:21" (1/1) ... [2021-11-02 22:38:21,726 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:38:21" (1/1) ... [2021-11-02 22:38:21,729 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:38:21" (1/1) ... [2021-11-02 22:38:21,745 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-02 22:38:21,746 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-02 22:38:21,747 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-02 22:38:21,747 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-02 22:38:21,748 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:38:21" (1/1) ... [2021-11-02 22:38:21,766 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:38:21,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:21,794 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-02 22:38:21,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-02 22:38:21,851 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-02 22:38:21,851 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-02 22:38:21,852 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-02 22:38:21,852 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-02 22:38:22,112 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-02 22:38:22,112 INFO L299 CfgBuilder]: Removed 12 assume(true) statements. [2021-11-02 22:38:22,115 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:38:22 BoogieIcfgContainer [2021-11-02 22:38:22,115 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-02 22:38:22,117 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-02 22:38:22,118 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-02 22:38:22,122 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-02 22:38:22,123 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 10:38:21" (1/3) ... [2021-11-02 22:38:22,124 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34132d63 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:38:22, skipping insertion in model container [2021-11-02 22:38:22,124 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:38:21" (2/3) ... [2021-11-02 22:38:22,125 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34132d63 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:38:22, skipping insertion in model container [2021-11-02 22:38:22,125 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:38:22" (3/3) ... [2021-11-02 22:38:22,127 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de61.c [2021-11-02 22:38:22,134 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-02 22:38:22,134 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-02 22:38:22,234 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-02 22:38:22,257 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=PETRI_NET, 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 [2021-11-02 22:38:22,257 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-02 22:38:22,275 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:22,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-02 22:38:22,282 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:22,283 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:22,284 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:22,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:22,291 INFO L85 PathProgramCache]: Analyzing trace with hash 1928996963, now seen corresponding path program 1 times [2021-11-02 22:38:22,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:22,303 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2039039672] [2021-11-02 22:38:22,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:22,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:22,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:22,495 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:22,495 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:22,496 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2039039672] [2021-11-02 22:38:22,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2039039672] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:38:22,497 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:38:22,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-02 22:38:22,499 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170831327] [2021-11-02 22:38:22,506 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-02 22:38:22,506 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:22,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-02 22:38:22,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-02 22:38:22,527 INFO L87 Difference]: Start difference. First operand has 17 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:22,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:22,546 INFO L93 Difference]: Finished difference Result 31 states and 53 transitions. [2021-11-02 22:38:22,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-02 22:38:22,548 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-02 22:38:22,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:22,558 INFO L225 Difference]: With dead ends: 31 [2021-11-02 22:38:22,559 INFO L226 Difference]: Without dead ends: 13 [2021-11-02 22:38:22,562 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-02 22:38:22,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-02 22:38:22,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-02 22:38:22,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.5) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:22,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 18 transitions. [2021-11-02 22:38:22,601 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 18 transitions. Word has length 12 [2021-11-02 22:38:22,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:22,602 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 18 transitions. [2021-11-02 22:38:22,602 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:22,603 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 18 transitions. [2021-11-02 22:38:22,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-02 22:38:22,603 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:22,604 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:22,604 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-02 22:38:22,604 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:22,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:22,606 INFO L85 PathProgramCache]: Analyzing trace with hash 1814480359, now seen corresponding path program 1 times [2021-11-02 22:38:22,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:22,606 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479203433] [2021-11-02 22:38:22,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:22,607 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:22,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:23,376 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:23,377 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:23,377 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479203433] [2021-11-02 22:38:23,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1479203433] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:38:23,378 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:38:23,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:38:23,379 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989008436] [2021-11-02 22:38:23,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:38:23,381 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:23,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:38:23,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:38:23,384 INFO L87 Difference]: Start difference. First operand 13 states and 18 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:23,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:23,566 INFO L93 Difference]: Finished difference Result 31 states and 46 transitions. [2021-11-02 22:38:23,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:38:23,567 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-02 22:38:23,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:23,568 INFO L225 Difference]: With dead ends: 31 [2021-11-02 22:38:23,569 INFO L226 Difference]: Without dead ends: 14 [2021-11-02 22:38:23,571 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:38:23,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-02 22:38:23,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-11-02 22:38:23,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:23,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 19 transitions. [2021-11-02 22:38:23,581 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 19 transitions. Word has length 12 [2021-11-02 22:38:23,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:23,581 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 19 transitions. [2021-11-02 22:38:23,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:23,582 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 19 transitions. [2021-11-02 22:38:23,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-02 22:38:23,583 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:23,583 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:23,584 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-02 22:38:23,584 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:23,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:23,588 INFO L85 PathProgramCache]: Analyzing trace with hash -1427170164, now seen corresponding path program 1 times [2021-11-02 22:38:23,589 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:23,591 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [138619856] [2021-11-02 22:38:23,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:23,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:23,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:23,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:23,783 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:23,785 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [138619856] [2021-11-02 22:38:23,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [138619856] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:23,791 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [953731026] [2021-11-02 22:38:23,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:23,791 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:23,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:23,799 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:23,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-02 22:38:23,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:23,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-02 22:38:23,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:24,104 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:24,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [953731026] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:24,105 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:24,106 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-11-02 22:38:24,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120069804] [2021-11-02 22:38:24,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:38:24,108 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:24,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:38:24,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:38:24,112 INFO L87 Difference]: Start difference. First operand 14 states and 19 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:24,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:24,233 INFO L93 Difference]: Finished difference Result 38 states and 56 transitions. [2021-11-02 22:38:24,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:38:24,234 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-02 22:38:24,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:24,237 INFO L225 Difference]: With dead ends: 38 [2021-11-02 22:38:24,237 INFO L226 Difference]: Without dead ends: 30 [2021-11-02 22:38:24,238 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:38:24,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-02 22:38:24,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 26. [2021-11-02 22:38:24,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:24,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 37 transitions. [2021-11-02 22:38:24,248 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 37 transitions. Word has length 13 [2021-11-02 22:38:24,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:24,249 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 37 transitions. [2021-11-02 22:38:24,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:24,249 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 37 transitions. [2021-11-02 22:38:24,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-02 22:38:24,250 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:24,250 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:24,280 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:24,451 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:24,452 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:24,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:24,452 INFO L85 PathProgramCache]: Analyzing trace with hash 1160878727, now seen corresponding path program 2 times [2021-11-02 22:38:24,453 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:24,453 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1793362880] [2021-11-02 22:38:24,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:24,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:24,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:24,564 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:24,564 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:24,565 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1793362880] [2021-11-02 22:38:24,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1793362880] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:24,565 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364251944] [2021-11-02 22:38:24,565 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:38:24,566 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:24,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:24,567 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:24,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-02 22:38:24,645 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:38:24,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:24,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-02 22:38:24,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:24,745 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:24,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1364251944] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:24,746 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:24,746 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-11-02 22:38:24,746 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719313187] [2021-11-02 22:38:24,747 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:38:24,747 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:24,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:38:24,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:38:24,748 INFO L87 Difference]: Start difference. First operand 26 states and 37 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:24,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:24,887 INFO L93 Difference]: Finished difference Result 54 states and 82 transitions. [2021-11-02 22:38:24,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:38:24,888 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-02 22:38:24,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:24,889 INFO L225 Difference]: With dead ends: 54 [2021-11-02 22:38:24,889 INFO L226 Difference]: Without dead ends: 46 [2021-11-02 22:38:24,890 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:38:24,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-02 22:38:24,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 34. [2021-11-02 22:38:24,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.4848484848484849) internal successors, (49), 33 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:24,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 49 transitions. [2021-11-02 22:38:24,897 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 49 transitions. Word has length 14 [2021-11-02 22:38:24,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:24,897 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 49 transitions. [2021-11-02 22:38:24,898 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:24,898 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 49 transitions. [2021-11-02 22:38:24,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-02 22:38:24,899 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:24,899 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:24,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:25,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:25,127 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:25,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:25,128 INFO L85 PathProgramCache]: Analyzing trace with hash -603304611, now seen corresponding path program 1 times [2021-11-02 22:38:25,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:25,128 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094153405] [2021-11-02 22:38:25,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:25,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:25,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:25,248 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:25,249 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:25,249 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094153405] [2021-11-02 22:38:25,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1094153405] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:25,249 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2105624889] [2021-11-02 22:38:25,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:25,250 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:25,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:25,251 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:25,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-02 22:38:25,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:25,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-02 22:38:25,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:25,411 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:38:25,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2105624889] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:25,412 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:25,412 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4] total 9 [2021-11-02 22:38:25,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810551054] [2021-11-02 22:38:25,413 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:38:25,413 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:25,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:38:25,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:38:25,415 INFO L87 Difference]: Start difference. First operand 34 states and 49 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:25,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:25,754 INFO L93 Difference]: Finished difference Result 124 states and 173 transitions. [2021-11-02 22:38:25,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 22:38:25,755 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-02 22:38:25,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:25,758 INFO L225 Difference]: With dead ends: 124 [2021-11-02 22:38:25,758 INFO L226 Difference]: Without dead ends: 105 [2021-11-02 22:38:25,759 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:38:25,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-02 22:38:25,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 55. [2021-11-02 22:38:25,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.4074074074074074) internal successors, (76), 54 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:25,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 76 transitions. [2021-11-02 22:38:25,771 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 76 transitions. Word has length 15 [2021-11-02 22:38:25,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:25,772 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 76 transitions. [2021-11-02 22:38:25,772 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:25,772 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 76 transitions. [2021-11-02 22:38:25,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-02 22:38:25,773 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:25,774 INFO L513 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:25,812 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:25,988 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:25,988 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:25,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:25,989 INFO L85 PathProgramCache]: Analyzing trace with hash -213984276, now seen corresponding path program 3 times [2021-11-02 22:38:25,989 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:25,989 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682648016] [2021-11-02 22:38:25,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:25,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:26,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:26,091 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:26,091 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:26,092 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682648016] [2021-11-02 22:38:26,092 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [682648016] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:26,092 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [194066952] [2021-11-02 22:38:26,092 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:38:26,092 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:26,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:26,094 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:26,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-02 22:38:26,178 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-02 22:38:26,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:26,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-02 22:38:26,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:26,305 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:26,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [194066952] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:26,306 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:26,306 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-11-02 22:38:26,306 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589780298] [2021-11-02 22:38:26,307 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:38:26,307 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:26,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:38:26,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:38:26,308 INFO L87 Difference]: Start difference. First operand 55 states and 76 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:26,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:26,447 INFO L93 Difference]: Finished difference Result 98 states and 147 transitions. [2021-11-02 22:38:26,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:38:26,448 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-02 22:38:26,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:26,451 INFO L225 Difference]: With dead ends: 98 [2021-11-02 22:38:26,452 INFO L226 Difference]: Without dead ends: 88 [2021-11-02 22:38:26,452 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:38:26,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-02 22:38:26,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 68. [2021-11-02 22:38:26,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.4179104477611941) internal successors, (95), 67 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:26,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 95 transitions. [2021-11-02 22:38:26,477 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 95 transitions. Word has length 15 [2021-11-02 22:38:26,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:26,478 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 95 transitions. [2021-11-02 22:38:26,479 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:26,479 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 95 transitions. [2021-11-02 22:38:26,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-02 22:38:26,481 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:26,481 INFO L513 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:26,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:26,703 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:26,703 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:26,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:26,704 INFO L85 PathProgramCache]: Analyzing trace with hash 114935591, now seen corresponding path program 4 times [2021-11-02 22:38:26,704 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:26,704 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461161777] [2021-11-02 22:38:26,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:26,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:26,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:26,864 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:26,864 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:26,865 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461161777] [2021-11-02 22:38:26,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1461161777] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:26,865 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [613717597] [2021-11-02 22:38:26,865 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:38:26,866 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:26,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:26,867 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:26,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-02 22:38:26,965 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:38:26,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:26,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-02 22:38:26,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:27,076 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:27,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [613717597] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:27,077 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:27,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-11-02 22:38:27,078 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15125804] [2021-11-02 22:38:27,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:38:27,079 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:27,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:38:27,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:38:27,080 INFO L87 Difference]: Start difference. First operand 68 states and 95 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:27,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:27,291 INFO L93 Difference]: Finished difference Result 116 states and 176 transitions. [2021-11-02 22:38:27,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:38:27,292 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-02 22:38:27,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:27,293 INFO L225 Difference]: With dead ends: 116 [2021-11-02 22:38:27,293 INFO L226 Difference]: Without dead ends: 106 [2021-11-02 22:38:27,294 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:38:27,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-11-02 22:38:27,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 81. [2021-11-02 22:38:27,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 80 states have (on average 1.425) internal successors, (114), 80 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:27,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 114 transitions. [2021-11-02 22:38:27,304 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 114 transitions. Word has length 16 [2021-11-02 22:38:27,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:27,304 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 114 transitions. [2021-11-02 22:38:27,305 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:27,305 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 114 transitions. [2021-11-02 22:38:27,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-02 22:38:27,306 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:27,307 INFO L513 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:27,351 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:27,523 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-02 22:38:27,523 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:27,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:27,524 INFO L85 PathProgramCache]: Analyzing trace with hash 1721516876, now seen corresponding path program 5 times [2021-11-02 22:38:27,524 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:27,524 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75578751] [2021-11-02 22:38:27,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:27,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:27,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:27,675 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:27,677 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:27,677 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75578751] [2021-11-02 22:38:27,677 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [75578751] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:27,677 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [376512927] [2021-11-02 22:38:27,678 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:38:27,678 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:27,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:27,683 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:27,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-02 22:38:27,795 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-02 22:38:27,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:27,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-02 22:38:27,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:27,936 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:27,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [376512927] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:27,936 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:27,936 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2021-11-02 22:38:27,937 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993562858] [2021-11-02 22:38:27,937 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:38:27,937 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:27,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:38:27,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:38:27,939 INFO L87 Difference]: Start difference. First operand 81 states and 114 transitions. Second operand has 10 states, 10 states have (on average 1.9) internal successors, (19), 10 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:28,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:28,198 INFO L93 Difference]: Finished difference Result 134 states and 205 transitions. [2021-11-02 22:38:28,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:38:28,198 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.9) internal successors, (19), 10 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-02 22:38:28,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:28,200 INFO L225 Difference]: With dead ends: 134 [2021-11-02 22:38:28,200 INFO L226 Difference]: Without dead ends: 124 [2021-11-02 22:38:28,200 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:38:28,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-02 22:38:28,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 94. [2021-11-02 22:38:28,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 93 states have (on average 1.4301075268817205) internal successors, (133), 93 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:28,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 133 transitions. [2021-11-02 22:38:28,210 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 133 transitions. Word has length 17 [2021-11-02 22:38:28,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:28,210 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 133 transitions. [2021-11-02 22:38:28,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.9) internal successors, (19), 10 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:28,211 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 133 transitions. [2021-11-02 22:38:28,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-02 22:38:28,213 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:28,213 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:28,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:28,434 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-02 22:38:28,435 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:28,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:28,435 INFO L85 PathProgramCache]: Analyzing trace with hash 188466470, now seen corresponding path program 1 times [2021-11-02 22:38:28,435 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:28,436 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [363462727] [2021-11-02 22:38:28,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:28,436 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:28,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:28,878 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:38:28,878 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:28,879 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [363462727] [2021-11-02 22:38:28,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [363462727] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:28,879 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [900824765] [2021-11-02 22:38:28,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:28,879 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:28,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:28,881 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:28,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-02 22:38:29,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:29,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-02 22:38:29,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:29,533 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:29,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [900824765] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:29,535 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:29,536 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2021-11-02 22:38:29,539 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157445986] [2021-11-02 22:38:29,542 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-02 22:38:29,542 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:29,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-02 22:38:29,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:38:29,544 INFO L87 Difference]: Start difference. First operand 94 states and 133 transitions. Second operand has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:29,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:29,862 INFO L93 Difference]: Finished difference Result 116 states and 155 transitions. [2021-11-02 22:38:29,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 22:38:29,862 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-02 22:38:29,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:29,864 INFO L225 Difference]: With dead ends: 116 [2021-11-02 22:38:29,864 INFO L226 Difference]: Without dead ends: 106 [2021-11-02 22:38:29,864 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:38:29,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-11-02 22:38:29,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 94. [2021-11-02 22:38:29,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 93 states have (on average 1.4301075268817205) internal successors, (133), 93 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:29,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 133 transitions. [2021-11-02 22:38:29,873 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 133 transitions. Word has length 18 [2021-11-02 22:38:29,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:29,873 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 133 transitions. [2021-11-02 22:38:29,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:29,874 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 133 transitions. [2021-11-02 22:38:29,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-02 22:38:29,875 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:29,876 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:29,923 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:30,091 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:30,091 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:30,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:30,092 INFO L85 PathProgramCache]: Analyzing trace with hash 748617255, now seen corresponding path program 2 times [2021-11-02 22:38:30,092 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:30,092 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011853938] [2021-11-02 22:38:30,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:30,092 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:30,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:30,257 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:30,258 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:30,258 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011853938] [2021-11-02 22:38:30,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1011853938] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:30,258 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1301772377] [2021-11-02 22:38:30,259 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:38:30,259 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:30,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:30,260 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:30,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-02 22:38:30,390 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:38:30,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:30,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-02 22:38:30,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:30,496 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:38:30,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1301772377] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:30,497 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:30,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5] total 12 [2021-11-02 22:38:30,498 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252036600] [2021-11-02 22:38:30,498 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:38:30,500 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:30,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:38:30,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:38:30,506 INFO L87 Difference]: Start difference. First operand 94 states and 133 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:31,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:31,612 INFO L93 Difference]: Finished difference Result 304 states and 411 transitions. [2021-11-02 22:38:31,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-02 22:38:31,612 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-02 22:38:31,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:31,614 INFO L225 Difference]: With dead ends: 304 [2021-11-02 22:38:31,615 INFO L226 Difference]: Without dead ends: 271 [2021-11-02 22:38:31,616 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 450 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=253, Invalid=1553, Unknown=0, NotChecked=0, Total=1806 [2021-11-02 22:38:31,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2021-11-02 22:38:31,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 118. [2021-11-02 22:38:31,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.4102564102564104) internal successors, (165), 117 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:31,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 165 transitions. [2021-11-02 22:38:31,632 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 165 transitions. Word has length 18 [2021-11-02 22:38:31,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:31,632 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 165 transitions. [2021-11-02 22:38:31,633 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:31,633 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 165 transitions. [2021-11-02 22:38:31,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-02 22:38:31,635 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:31,635 INFO L513 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:31,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:31,859 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:31,860 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:31,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:31,861 INFO L85 PathProgramCache]: Analyzing trace with hash -14070841, now seen corresponding path program 6 times [2021-11-02 22:38:31,861 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:31,861 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1829233863] [2021-11-02 22:38:31,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:31,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:31,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:32,006 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:32,006 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:32,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1829233863] [2021-11-02 22:38:32,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1829233863] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:32,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [473299252] [2021-11-02 22:38:32,007 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:38:32,008 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:32,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:32,011 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:32,020 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-02 22:38:32,159 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-11-02 22:38:32,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:32,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-02 22:38:32,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:32,267 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:32,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [473299252] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:32,268 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:32,268 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2021-11-02 22:38:32,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416799395] [2021-11-02 22:38:32,269 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-02 22:38:32,270 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:32,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-02 22:38:32,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:38:32,271 INFO L87 Difference]: Start difference. First operand 118 states and 165 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:32,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:32,606 INFO L93 Difference]: Finished difference Result 183 states and 276 transitions. [2021-11-02 22:38:32,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:38:32,607 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-02 22:38:32,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:32,609 INFO L225 Difference]: With dead ends: 183 [2021-11-02 22:38:32,609 INFO L226 Difference]: Without dead ends: 173 [2021-11-02 22:38:32,610 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:38:32,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-11-02 22:38:32,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 134. [2021-11-02 22:38:32,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 133 states have (on average 1.4210526315789473) internal successors, (189), 133 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:32,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 189 transitions. [2021-11-02 22:38:32,622 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 189 transitions. Word has length 18 [2021-11-02 22:38:32,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:32,623 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 189 transitions. [2021-11-02 22:38:32,623 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:32,623 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 189 transitions. [2021-11-02 22:38:32,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-02 22:38:32,631 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:32,631 INFO L513 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:32,679 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:32,859 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:32,859 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:32,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:32,860 INFO L85 PathProgramCache]: Analyzing trace with hash 2017284780, now seen corresponding path program 7 times [2021-11-02 22:38:32,860 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:32,860 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92898191] [2021-11-02 22:38:32,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:32,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:32,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:33,019 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:33,019 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:33,020 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92898191] [2021-11-02 22:38:33,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [92898191] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:33,020 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534933753] [2021-11-02 22:38:33,020 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:38:33,020 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:33,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:33,023 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:33,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-02 22:38:33,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:33,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-02 22:38:33,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:33,310 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:33,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1534933753] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:33,311 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:33,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-11-02 22:38:33,312 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950728512] [2021-11-02 22:38:33,312 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:38:33,312 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:33,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:38:33,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:38:33,313 INFO L87 Difference]: Start difference. First operand 134 states and 189 transitions. Second operand has 12 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:33,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:33,671 INFO L93 Difference]: Finished difference Result 204 states and 310 transitions. [2021-11-02 22:38:33,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:38:33,672 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-02 22:38:33,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:33,674 INFO L225 Difference]: With dead ends: 204 [2021-11-02 22:38:33,674 INFO L226 Difference]: Without dead ends: 194 [2021-11-02 22:38:33,675 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:38:33,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-11-02 22:38:33,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 150. [2021-11-02 22:38:33,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 149 states have (on average 1.429530201342282) internal successors, (213), 149 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:33,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 213 transitions. [2021-11-02 22:38:33,684 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 213 transitions. Word has length 19 [2021-11-02 22:38:33,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:33,684 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 213 transitions. [2021-11-02 22:38:33,684 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:33,685 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 213 transitions. [2021-11-02 22:38:33,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-02 22:38:33,685 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:33,686 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:33,731 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:33,902 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:33,902 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:33,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:33,903 INFO L85 PathProgramCache]: Analyzing trace with hash -1346970424, now seen corresponding path program 2 times [2021-11-02 22:38:33,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:33,903 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1469081831] [2021-11-02 22:38:33,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:33,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:33,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:33,996 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:38:33,997 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:33,997 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1469081831] [2021-11-02 22:38:33,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1469081831] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:33,997 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [179110060] [2021-11-02 22:38:33,998 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:38:33,998 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:33,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:33,999 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:34,015 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-02 22:38:34,151 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:38:34,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:34,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-02 22:38:34,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:34,229 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:38:34,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [179110060] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:34,230 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:34,230 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-11-02 22:38:34,232 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [808260283] [2021-11-02 22:38:34,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:38:34,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:34,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:38:34,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:38:34,234 INFO L87 Difference]: Start difference. First operand 150 states and 213 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 4 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:34,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:34,267 INFO L93 Difference]: Finished difference Result 247 states and 346 transitions. [2021-11-02 22:38:34,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:38:34,268 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 4 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-02 22:38:34,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:34,270 INFO L225 Difference]: With dead ends: 247 [2021-11-02 22:38:34,270 INFO L226 Difference]: Without dead ends: 190 [2021-11-02 22:38:34,271 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:38:34,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-11-02 22:38:34,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 146. [2021-11-02 22:38:34,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.393103448275862) internal successors, (202), 145 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:34,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 202 transitions. [2021-11-02 22:38:34,280 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 202 transitions. Word has length 20 [2021-11-02 22:38:34,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:34,280 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 202 transitions. [2021-11-02 22:38:34,280 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 4 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:34,280 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 202 transitions. [2021-11-02 22:38:34,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-02 22:38:34,281 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:34,282 INFO L513 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:34,323 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:34,495 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-02 22:38:34,496 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:34,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:34,496 INFO L85 PathProgramCache]: Analyzing trace with hash 564799591, now seen corresponding path program 8 times [2021-11-02 22:38:34,496 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:34,496 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738532890] [2021-11-02 22:38:34,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:34,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:34,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:34,662 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:34,662 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:34,662 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738532890] [2021-11-02 22:38:34,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [738532890] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:34,662 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1970926822] [2021-11-02 22:38:34,662 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:38:34,663 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:34,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:34,667 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:34,689 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-02 22:38:34,819 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:38:34,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:34,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-02 22:38:34,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:34,942 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:34,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1970926822] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:34,943 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:34,943 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 12 [2021-11-02 22:38:34,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858870520] [2021-11-02 22:38:34,944 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:38:34,945 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:34,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:38:34,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:38:34,946 INFO L87 Difference]: Start difference. First operand 146 states and 202 transitions. Second operand has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 12 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:35,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:35,294 INFO L93 Difference]: Finished difference Result 231 states and 352 transitions. [2021-11-02 22:38:35,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:38:35,294 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 12 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-02 22:38:35,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:35,296 INFO L225 Difference]: With dead ends: 231 [2021-11-02 22:38:35,296 INFO L226 Difference]: Without dead ends: 217 [2021-11-02 22:38:35,297 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:38:35,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-11-02 22:38:35,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 162. [2021-11-02 22:38:35,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 161 states have (on average 1.3975155279503106) internal successors, (225), 161 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:35,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 225 transitions. [2021-11-02 22:38:35,305 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 225 transitions. Word has length 20 [2021-11-02 22:38:35,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:35,305 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 225 transitions. [2021-11-02 22:38:35,305 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 12 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:35,306 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 225 transitions. [2021-11-02 22:38:35,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-02 22:38:35,307 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:35,307 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:35,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:35,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-02 22:38:35,535 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:35,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:35,536 INFO L85 PathProgramCache]: Analyzing trace with hash 48319293, now seen corresponding path program 1 times [2021-11-02 22:38:35,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:35,536 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016309771] [2021-11-02 22:38:35,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:35,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:35,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:35,646 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-02 22:38:35,646 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:35,647 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016309771] [2021-11-02 22:38:35,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016309771] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:35,647 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1508122675] [2021-11-02 22:38:35,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:35,648 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:35,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:35,651 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:35,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-02 22:38:35,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:35,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-02 22:38:35,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:35,916 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-02 22:38:35,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1508122675] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:35,917 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:35,917 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2021-11-02 22:38:35,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333184199] [2021-11-02 22:38:35,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:38:35,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:35,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:38:35,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:38:35,919 INFO L87 Difference]: Start difference. First operand 162 states and 225 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:36,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:36,058 INFO L93 Difference]: Finished difference Result 200 states and 270 transitions. [2021-11-02 22:38:36,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:38:36,059 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-02 22:38:36,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:36,060 INFO L225 Difference]: With dead ends: 200 [2021-11-02 22:38:36,060 INFO L226 Difference]: Without dead ends: 187 [2021-11-02 22:38:36,061 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:38:36,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-11-02 22:38:36,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 162. [2021-11-02 22:38:36,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 161 states have (on average 1.391304347826087) internal successors, (224), 161 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:36,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 224 transitions. [2021-11-02 22:38:36,071 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 224 transitions. Word has length 21 [2021-11-02 22:38:36,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:36,071 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 224 transitions. [2021-11-02 22:38:36,072 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:36,072 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 224 transitions. [2021-11-02 22:38:36,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-02 22:38:36,075 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:36,075 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:36,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:36,298 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-02 22:38:36,298 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:36,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:36,299 INFO L85 PathProgramCache]: Analyzing trace with hash 1411583389, now seen corresponding path program 3 times [2021-11-02 22:38:36,299 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:36,299 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [645497553] [2021-11-02 22:38:36,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:36,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:36,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:36,474 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:36,474 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:36,474 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [645497553] [2021-11-02 22:38:36,474 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [645497553] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:36,475 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [724823270] [2021-11-02 22:38:36,475 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:38:36,475 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:36,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:36,476 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:36,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-02 22:38:36,653 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-02 22:38:36,653 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:36,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-02 22:38:36,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:36,771 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:38:36,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [724823270] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:36,771 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:36,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 15 [2021-11-02 22:38:36,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761797434] [2021-11-02 22:38:36,772 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-02 22:38:36,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:36,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-02 22:38:36,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:38:36,773 INFO L87 Difference]: Start difference. First operand 162 states and 224 transitions. Second operand has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:38,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:38,727 INFO L93 Difference]: Finished difference Result 517 states and 694 transitions. [2021-11-02 22:38:38,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-02 22:38:38,728 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-02 22:38:38,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:38,731 INFO L225 Difference]: With dead ends: 517 [2021-11-02 22:38:38,731 INFO L226 Difference]: Without dead ends: 473 [2021-11-02 22:38:38,734 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1515 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=524, Invalid=4446, Unknown=0, NotChecked=0, Total=4970 [2021-11-02 22:38:38,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 473 states. [2021-11-02 22:38:38,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 473 to 191. [2021-11-02 22:38:38,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 190 states have (on average 1.4) internal successors, (266), 190 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:38,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 266 transitions. [2021-11-02 22:38:38,745 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 266 transitions. Word has length 21 [2021-11-02 22:38:38,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:38,746 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 266 transitions. [2021-11-02 22:38:38,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:38,746 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 266 transitions. [2021-11-02 22:38:38,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-02 22:38:38,747 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:38,747 INFO L513 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:38,786 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:38,975 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-02 22:38:38,975 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:38,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:38,976 INFO L85 PathProgramCache]: Analyzing trace with hash -1512568308, now seen corresponding path program 9 times [2021-11-02 22:38:38,976 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:38,976 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634328517] [2021-11-02 22:38:38,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:38,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:39,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:39,185 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:39,186 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:39,186 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634328517] [2021-11-02 22:38:39,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1634328517] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:39,186 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [654423983] [2021-11-02 22:38:39,186 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:38:39,186 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:39,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:39,191 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:39,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-02 22:38:39,410 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-02 22:38:39,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:39,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-02 22:38:39,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:39,594 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:39,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [654423983] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:39,594 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:39,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2021-11-02 22:38:39,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115783034] [2021-11-02 22:38:39,596 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-02 22:38:39,596 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:39,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-02 22:38:39,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:38:39,598 INFO L87 Difference]: Start difference. First operand 191 states and 266 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:40,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:40,106 INFO L93 Difference]: Finished difference Result 285 states and 433 transitions. [2021-11-02 22:38:40,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 22:38:40,106 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-02 22:38:40,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:40,108 INFO L225 Difference]: With dead ends: 285 [2021-11-02 22:38:40,109 INFO L226 Difference]: Without dead ends: 271 [2021-11-02 22:38:40,109 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:38:40,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2021-11-02 22:38:40,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 210. [2021-11-02 22:38:40,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 209 states have (on average 1.4066985645933014) internal successors, (294), 209 states have internal predecessors, (294), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:40,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 294 transitions. [2021-11-02 22:38:40,125 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 294 transitions. Word has length 21 [2021-11-02 22:38:40,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:40,125 INFO L470 AbstractCegarLoop]: Abstraction has 210 states and 294 transitions. [2021-11-02 22:38:40,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:40,126 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 294 transitions. [2021-11-02 22:38:40,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-02 22:38:40,126 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:40,127 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:40,170 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:40,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-02 22:38:40,344 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:40,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:40,345 INFO L85 PathProgramCache]: Analyzing trace with hash 1372519271, now seen corresponding path program 3 times [2021-11-02 22:38:40,345 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:40,345 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [189800447] [2021-11-02 22:38:40,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:40,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:40,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:40,408 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-02 22:38:40,408 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:40,408 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [189800447] [2021-11-02 22:38:40,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [189800447] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:40,409 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975925932] [2021-11-02 22:38:40,409 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:38:40,409 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:40,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:40,410 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:40,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-02 22:38:40,579 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-02 22:38:40,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:40,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-02 22:38:40,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:40,653 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-02 22:38:40,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975925932] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:40,654 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:40,654 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2021-11-02 22:38:40,654 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965845596] [2021-11-02 22:38:40,654 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:38:40,654 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:40,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:38:40,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:38:40,655 INFO L87 Difference]: Start difference. First operand 210 states and 294 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:40,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:40,731 INFO L93 Difference]: Finished difference Result 344 states and 467 transitions. [2021-11-02 22:38:40,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:38:40,732 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-02 22:38:40,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:40,734 INFO L225 Difference]: With dead ends: 344 [2021-11-02 22:38:40,734 INFO L226 Difference]: Without dead ends: 332 [2021-11-02 22:38:40,735 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:38:40,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2021-11-02 22:38:40,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 224. [2021-11-02 22:38:40,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 223 states have (on average 1.3811659192825112) internal successors, (308), 223 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:40,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 308 transitions. [2021-11-02 22:38:40,746 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 308 transitions. Word has length 22 [2021-11-02 22:38:40,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:40,746 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 308 transitions. [2021-11-02 22:38:40,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:40,747 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 308 transitions. [2021-11-02 22:38:40,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-02 22:38:40,747 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:40,748 INFO L513 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:40,782 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:40,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:40,963 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:40,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:40,963 INFO L85 PathProgramCache]: Analyzing trace with hash -1486463737, now seen corresponding path program 10 times [2021-11-02 22:38:40,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:40,964 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [729097938] [2021-11-02 22:38:40,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:40,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:40,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:41,122 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:41,123 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:41,123 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [729097938] [2021-11-02 22:38:41,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [729097938] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:41,123 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [953702743] [2021-11-02 22:38:41,123 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:38:41,123 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:41,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:41,124 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:41,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-02 22:38:41,312 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:38:41,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:41,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-02 22:38:41,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:41,443 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:41,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [953702743] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:41,446 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:41,447 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-11-02 22:38:41,447 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781660807] [2021-11-02 22:38:41,449 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-02 22:38:41,449 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:41,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-02 22:38:41,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:38:41,450 INFO L87 Difference]: Start difference. First operand 224 states and 308 transitions. Second operand has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:41,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:41,994 INFO L93 Difference]: Finished difference Result 339 states and 514 transitions. [2021-11-02 22:38:41,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-02 22:38:41,994 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-02 22:38:41,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:41,997 INFO L225 Difference]: With dead ends: 339 [2021-11-02 22:38:41,997 INFO L226 Difference]: Without dead ends: 323 [2021-11-02 22:38:41,997 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=207, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:38:41,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2021-11-02 22:38:42,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 244. [2021-11-02 22:38:42,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 243 states have (on average 1.3868312757201646) internal successors, (337), 243 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:42,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 337 transitions. [2021-11-02 22:38:42,010 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 337 transitions. Word has length 22 [2021-11-02 22:38:42,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:42,011 INFO L470 AbstractCegarLoop]: Abstraction has 244 states and 337 transitions. [2021-11-02 22:38:42,011 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:42,011 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 337 transitions. [2021-11-02 22:38:42,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-02 22:38:42,012 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:42,012 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:42,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:42,227 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:42,227 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:42,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:42,228 INFO L85 PathProgramCache]: Analyzing trace with hash 1583718253, now seen corresponding path program 2 times [2021-11-02 22:38:42,228 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:42,228 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703091893] [2021-11-02 22:38:42,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:42,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:42,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:42,328 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-02 22:38:42,328 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:42,328 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703091893] [2021-11-02 22:38:42,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1703091893] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:42,329 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [979784844] [2021-11-02 22:38:42,329 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:38:42,329 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:42,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:42,330 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:42,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-02 22:38:42,518 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:38:42,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:42,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-02 22:38:42,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:42,704 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-02 22:38:42,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [979784844] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:42,704 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:42,704 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 13 [2021-11-02 22:38:42,705 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919734013] [2021-11-02 22:38:42,705 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-02 22:38:42,705 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:42,705 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-02 22:38:42,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:38:42,706 INFO L87 Difference]: Start difference. First operand 244 states and 337 transitions. Second operand has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:42,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:42,961 INFO L93 Difference]: Finished difference Result 295 states and 397 transitions. [2021-11-02 22:38:42,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:38:42,962 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-02 22:38:42,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:42,964 INFO L225 Difference]: With dead ends: 295 [2021-11-02 22:38:42,964 INFO L226 Difference]: Without dead ends: 281 [2021-11-02 22:38:42,965 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:38:42,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2021-11-02 22:38:42,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 244. [2021-11-02 22:38:42,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 243 states have (on average 1.382716049382716) internal successors, (336), 243 states have internal predecessors, (336), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:42,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 336 transitions. [2021-11-02 22:38:42,976 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 336 transitions. Word has length 23 [2021-11-02 22:38:42,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:42,976 INFO L470 AbstractCegarLoop]: Abstraction has 244 states and 336 transitions. [2021-11-02 22:38:42,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:42,977 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 336 transitions. [2021-11-02 22:38:42,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-02 22:38:42,977 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:42,978 INFO L513 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:43,019 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:43,193 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:43,194 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:43,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:43,194 INFO L85 PathProgramCache]: Analyzing trace with hash -677222036, now seen corresponding path program 11 times [2021-11-02 22:38:43,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:43,194 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737768308] [2021-11-02 22:38:43,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:43,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:43,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:43,430 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:43,430 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:43,431 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737768308] [2021-11-02 22:38:43,431 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [737768308] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:43,431 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1040049651] [2021-11-02 22:38:43,431 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:38:43,431 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:43,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:43,443 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:43,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-02 22:38:44,139 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-11-02 22:38:44,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:44,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-02 22:38:44,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:44,247 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:44,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1040049651] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:44,248 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:44,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 15 [2021-11-02 22:38:44,248 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777939731] [2021-11-02 22:38:44,249 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-02 22:38:44,249 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:44,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-02 22:38:44,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:38:44,250 INFO L87 Difference]: Start difference. First operand 244 states and 336 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:44,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:44,681 INFO L93 Difference]: Finished difference Result 366 states and 556 transitions. [2021-11-02 22:38:44,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-02 22:38:44,690 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-02 22:38:44,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:44,692 INFO L225 Difference]: With dead ends: 366 [2021-11-02 22:38:44,692 INFO L226 Difference]: Without dead ends: 350 [2021-11-02 22:38:44,693 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:38:44,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2021-11-02 22:38:44,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 264. [2021-11-02 22:38:44,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 263 states have (on average 1.3878326996197718) internal successors, (365), 263 states have internal predecessors, (365), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:44,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 365 transitions. [2021-11-02 22:38:44,705 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 365 transitions. Word has length 23 [2021-11-02 22:38:44,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:44,706 INFO L470 AbstractCegarLoop]: Abstraction has 264 states and 365 transitions. [2021-11-02 22:38:44,706 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:44,706 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 365 transitions. [2021-11-02 22:38:44,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-02 22:38:44,707 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:44,707 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:44,715 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:44,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:44,915 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:44,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:44,916 INFO L85 PathProgramCache]: Analyzing trace with hash -11866489, now seen corresponding path program 4 times [2021-11-02 22:38:44,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:44,916 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2108054021] [2021-11-02 22:38:44,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:44,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:44,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:45,330 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:38:45,330 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:45,330 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2108054021] [2021-11-02 22:38:45,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2108054021] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:45,331 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161289183] [2021-11-02 22:38:45,331 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:38:45,331 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:45,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:45,339 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:45,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-02 22:38:45,610 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:38:45,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:45,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-02 22:38:45,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:47,347 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:38:47,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1161289183] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:47,347 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:47,347 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 13 [2021-11-02 22:38:47,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585098442] [2021-11-02 22:38:47,348 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-02 22:38:47,348 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:47,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-02 22:38:47,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:38:47,349 INFO L87 Difference]: Start difference. First operand 264 states and 365 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:48,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:48,213 INFO L93 Difference]: Finished difference Result 342 states and 443 transitions. [2021-11-02 22:38:48,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 22:38:48,214 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-02 22:38:48,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:48,216 INFO L225 Difference]: With dead ends: 342 [2021-11-02 22:38:48,216 INFO L226 Difference]: Without dead ends: 332 [2021-11-02 22:38:48,216 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:38:48,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2021-11-02 22:38:48,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 270. [2021-11-02 22:38:48,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 269 states have (on average 1.3828996282527881) internal successors, (372), 269 states have internal predecessors, (372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:48,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 372 transitions. [2021-11-02 22:38:48,230 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 372 transitions. Word has length 24 [2021-11-02 22:38:48,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:48,230 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 372 transitions. [2021-11-02 22:38:48,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:48,231 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 372 transitions. [2021-11-02 22:38:48,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-02 22:38:48,231 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:48,232 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:48,267 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:48,459 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-02 22:38:48,459 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:48,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:48,460 INFO L85 PathProgramCache]: Analyzing trace with hash -147642777, now seen corresponding path program 4 times [2021-11-02 22:38:48,460 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:48,460 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [923476522] [2021-11-02 22:38:48,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:48,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:48,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:48,642 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:48,643 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:48,643 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [923476522] [2021-11-02 22:38:48,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [923476522] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:48,643 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723200133] [2021-11-02 22:38:48,643 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:38:48,643 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:48,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:48,645 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:48,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-02 22:38:48,919 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:38:48,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:48,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-02 22:38:48,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:49,087 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-02 22:38:49,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1723200133] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:49,088 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:49,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 7] total 18 [2021-11-02 22:38:49,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379580312] [2021-11-02 22:38:49,088 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-02 22:38:49,088 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:49,089 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-02 22:38:49,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:38:49,089 INFO L87 Difference]: Start difference. First operand 270 states and 372 transitions. Second operand has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:54,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:54,179 INFO L93 Difference]: Finished difference Result 905 states and 1179 transitions. [2021-11-02 22:38:54,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-11-02 22:38:54,180 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-02 22:38:54,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:54,184 INFO L225 Difference]: With dead ends: 905 [2021-11-02 22:38:54,184 INFO L226 Difference]: Without dead ends: 843 [2021-11-02 22:38:54,191 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5746 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1243, Invalid=14507, Unknown=0, NotChecked=0, Total=15750 [2021-11-02 22:38:54,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 843 states. [2021-11-02 22:38:54,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 843 to 308. [2021-11-02 22:38:54,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 308 states, 307 states have (on average 1.3908794788273615) internal successors, (427), 307 states have internal predecessors, (427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:54,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 427 transitions. [2021-11-02 22:38:54,213 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 427 transitions. Word has length 24 [2021-11-02 22:38:54,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:54,214 INFO L470 AbstractCegarLoop]: Abstraction has 308 states and 427 transitions. [2021-11-02 22:38:54,214 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:54,214 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 427 transitions. [2021-11-02 22:38:54,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-02 22:38:54,215 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:54,216 INFO L513 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:54,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:54,443 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-02 22:38:54,443 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:54,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:54,444 INFO L85 PathProgramCache]: Analyzing trace with hash -1360533081, now seen corresponding path program 12 times [2021-11-02 22:38:54,444 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:54,444 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570407472] [2021-11-02 22:38:54,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:54,444 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:54,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:54,697 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:54,697 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:54,697 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570407472] [2021-11-02 22:38:54,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570407472] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:54,697 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1525638302] [2021-11-02 22:38:54,697 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:38:54,698 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:54,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:54,699 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:54,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-02 22:38:55,106 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-02 22:38:55,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:55,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-02 22:38:55,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:55,272 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:55,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1525638302] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:55,272 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:55,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2021-11-02 22:38:55,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460433604] [2021-11-02 22:38:55,273 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-02 22:38:55,273 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:55,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-02 22:38:55,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:38:55,274 INFO L87 Difference]: Start difference. First operand 308 states and 427 transitions. Second operand has 17 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 17 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:56,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:56,037 INFO L93 Difference]: Finished difference Result 446 states and 674 transitions. [2021-11-02 22:38:56,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-02 22:38:56,038 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 17 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-02 22:38:56,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:56,041 INFO L225 Difference]: With dead ends: 446 [2021-11-02 22:38:56,041 INFO L226 Difference]: Without dead ends: 430 [2021-11-02 22:38:56,041 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=269, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:38:56,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2021-11-02 22:38:56,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 331. [2021-11-02 22:38:56,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 330 states have (on average 1.396969696969697) internal successors, (461), 330 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:56,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 461 transitions. [2021-11-02 22:38:56,069 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 461 transitions. Word has length 24 [2021-11-02 22:38:56,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:56,071 INFO L470 AbstractCegarLoop]: Abstraction has 331 states and 461 transitions. [2021-11-02 22:38:56,071 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 17 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:56,072 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 461 transitions. [2021-11-02 22:38:56,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-02 22:38:56,073 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:56,073 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:56,079 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:56,278 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-02 22:38:56,279 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:56,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:56,280 INFO L85 PathProgramCache]: Analyzing trace with hash 1419398141, now seen corresponding path program 3 times [2021-11-02 22:38:56,280 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:56,280 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308120210] [2021-11-02 22:38:56,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:56,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:56,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:56,416 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:38:56,416 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:56,416 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308120210] [2021-11-02 22:38:56,416 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1308120210] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:56,416 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [195958349] [2021-11-02 22:38:56,416 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:38:56,417 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:56,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:56,418 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:56,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-02 22:38:56,728 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-02 22:38:56,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:56,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-02 22:38:56,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:56,838 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-02 22:38:56,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [195958349] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:56,838 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:56,838 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6] total 14 [2021-11-02 22:38:56,838 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656579619] [2021-11-02 22:38:56,839 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-02 22:38:56,839 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:56,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-02 22:38:56,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:38:56,840 INFO L87 Difference]: Start difference. First operand 331 states and 461 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:57,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:57,278 INFO L93 Difference]: Finished difference Result 416 states and 569 transitions. [2021-11-02 22:38:57,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-02 22:38:57,283 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-02 22:38:57,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:57,285 INFO L225 Difference]: With dead ends: 416 [2021-11-02 22:38:57,285 INFO L226 Difference]: Without dead ends: 376 [2021-11-02 22:38:57,286 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=72, Invalid=480, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:38:57,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2021-11-02 22:38:57,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 322. [2021-11-02 22:38:57,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 321 states have (on average 1.3831775700934579) internal successors, (444), 321 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:57,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 444 transitions. [2021-11-02 22:38:57,304 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 444 transitions. Word has length 25 [2021-11-02 22:38:57,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:57,305 INFO L470 AbstractCegarLoop]: Abstraction has 322 states and 444 transitions. [2021-11-02 22:38:57,305 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:57,305 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 444 transitions. [2021-11-02 22:38:57,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-02 22:38:57,306 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:57,307 INFO L513 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:57,339 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:57,523 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-02 22:38:57,523 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:57,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:57,524 INFO L85 PathProgramCache]: Analyzing trace with hash -1068338996, now seen corresponding path program 13 times [2021-11-02 22:38:57,524 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:57,524 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [177797636] [2021-11-02 22:38:57,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:57,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:57,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:57,814 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:57,814 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:57,814 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [177797636] [2021-11-02 22:38:57,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [177797636] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:57,815 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1737032761] [2021-11-02 22:38:57,815 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:38:57,815 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:57,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:57,819 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:57,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-02 22:38:58,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:58,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-02 22:38:58,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:58,298 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:58,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1737032761] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:58,299 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:58,299 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2021-11-02 22:38:58,299 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146008220] [2021-11-02 22:38:58,301 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-02 22:38:58,301 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:58,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-02 22:38:58,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:38:58,305 INFO L87 Difference]: Start difference. First operand 322 states and 444 transitions. Second operand has 18 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:58,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:58,910 INFO L93 Difference]: Finished difference Result 463 states and 689 transitions. [2021-11-02 22:38:58,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-02 22:38:58,911 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-02 22:38:58,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:58,912 INFO L225 Difference]: With dead ends: 463 [2021-11-02 22:38:58,912 INFO L226 Difference]: Without dead ends: 437 [2021-11-02 22:38:58,913 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=303, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:38:58,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2021-11-02 22:38:58,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 344. [2021-11-02 22:38:58,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 343 states have (on average 1.3877551020408163) internal successors, (476), 343 states have internal predecessors, (476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:58,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 476 transitions. [2021-11-02 22:38:58,929 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 476 transitions. Word has length 25 [2021-11-02 22:38:58,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:58,929 INFO L470 AbstractCegarLoop]: Abstraction has 344 states and 476 transitions. [2021-11-02 22:38:58,930 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:58,930 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 476 transitions. [2021-11-02 22:38:58,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-02 22:38:58,931 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:58,931 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:58,957 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-11-02 22:38:59,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:59,147 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:59,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:59,147 INFO L85 PathProgramCache]: Analyzing trace with hash -1118410521, now seen corresponding path program 5 times [2021-11-02 22:38:59,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:59,148 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899309287] [2021-11-02 22:38:59,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:59,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:59,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:59,208 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:38:59,208 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:59,209 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899309287] [2021-11-02 22:38:59,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [899309287] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:59,209 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051443741] [2021-11-02 22:38:59,210 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:38:59,210 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:59,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:59,224 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:59,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-02 22:38:59,493 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-11-02 22:38:59,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:59,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-02 22:38:59,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:59,587 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:38:59,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2051443741] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:59,587 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:59,587 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2021-11-02 22:38:59,588 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641340918] [2021-11-02 22:38:59,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:38:59,588 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:59,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:38:59,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:38:59,588 INFO L87 Difference]: Start difference. First operand 344 states and 476 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:59,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:59,628 INFO L93 Difference]: Finished difference Result 566 states and 769 transitions. [2021-11-02 22:38:59,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:38:59,635 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-02 22:38:59,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:59,638 INFO L225 Difference]: With dead ends: 566 [2021-11-02 22:38:59,638 INFO L226 Difference]: Without dead ends: 462 [2021-11-02 22:38:59,639 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:38:59,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2021-11-02 22:38:59,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 318. [2021-11-02 22:38:59,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 318 states, 317 states have (on average 1.3722397476340693) internal successors, (435), 317 states have internal predecessors, (435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:59,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 435 transitions. [2021-11-02 22:38:59,657 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 435 transitions. Word has length 26 [2021-11-02 22:38:59,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:59,657 INFO L470 AbstractCegarLoop]: Abstraction has 318 states and 435 transitions. [2021-11-02 22:38:59,658 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:38:59,658 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 435 transitions. [2021-11-02 22:38:59,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-02 22:38:59,659 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:59,659 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:59,699 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:59,875 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-02 22:38:59,875 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:38:59,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:59,876 INFO L85 PathProgramCache]: Analyzing trace with hash -1999602746, now seen corresponding path program 6 times [2021-11-02 22:38:59,876 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:59,876 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123074945] [2021-11-02 22:38:59,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:59,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:59,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:59,975 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-02 22:38:59,975 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:59,975 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123074945] [2021-11-02 22:38:59,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2123074945] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:59,975 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1153638639] [2021-11-02 22:38:59,976 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:38:59,976 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:59,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:59,983 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:59,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-02 22:39:00,261 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-11-02 22:39:00,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:00,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-02 22:39:00,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:00,367 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-02 22:39:00,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1153638639] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:00,367 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:00,367 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 12 [2021-11-02 22:39:00,368 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945352380] [2021-11-02 22:39:00,368 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:39:00,368 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:00,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:39:00,368 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:39:00,369 INFO L87 Difference]: Start difference. First operand 318 states and 435 transitions. Second operand has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:00,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:00,521 INFO L93 Difference]: Finished difference Result 575 states and 778 transitions. [2021-11-02 22:39:00,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:39:00,531 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), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-02 22:39:00,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:00,534 INFO L225 Difference]: With dead ends: 575 [2021-11-02 22:39:00,535 INFO L226 Difference]: Without dead ends: 555 [2021-11-02 22:39:00,535 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:39:00,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2021-11-02 22:39:00,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 334. [2021-11-02 22:39:00,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 333 states have (on average 1.3483483483483483) internal successors, (449), 333 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:00,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 449 transitions. [2021-11-02 22:39:00,567 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 449 transitions. Word has length 26 [2021-11-02 22:39:00,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:00,567 INFO L470 AbstractCegarLoop]: Abstraction has 334 states and 449 transitions. [2021-11-02 22:39:00,567 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), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:00,567 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 449 transitions. [2021-11-02 22:39:00,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-02 22:39:00,573 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:00,573 INFO L513 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:00,611 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-02 22:39:00,787 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-02 22:39:00,787 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:39:00,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:00,788 INFO L85 PathProgramCache]: Analyzing trace with hash -600256953, now seen corresponding path program 14 times [2021-11-02 22:39:00,788 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:00,788 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404279060] [2021-11-02 22:39:00,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:00,788 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:00,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:01,058 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:01,058 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:01,058 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404279060] [2021-11-02 22:39:01,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1404279060] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:01,058 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1541475151] [2021-11-02 22:39:01,059 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:39:01,059 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:01,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:01,060 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:01,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-02 22:39:01,388 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:39:01,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:01,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-02 22:39:01,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:01,528 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:01,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1541475151] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:01,528 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:01,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2021-11-02 22:39:01,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879893658] [2021-11-02 22:39:01,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-02 22:39:01,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:01,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-02 22:39:01,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:39:01,530 INFO L87 Difference]: Start difference. First operand 334 states and 449 transitions. Second operand has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:02,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:02,322 INFO L93 Difference]: Finished difference Result 498 states and 736 transitions. [2021-11-02 22:39:02,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-02 22:39:02,323 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-02 22:39:02,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:02,326 INFO L225 Difference]: With dead ends: 498 [2021-11-02 22:39:02,326 INFO L226 Difference]: Without dead ends: 468 [2021-11-02 22:39:02,327 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=339, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:39:02,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 468 states. [2021-11-02 22:39:02,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 468 to 356. [2021-11-02 22:39:02,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 356 states, 355 states have (on average 1.352112676056338) internal successors, (480), 355 states have internal predecessors, (480), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:02,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 356 states to 356 states and 480 transitions. [2021-11-02 22:39:02,347 INFO L78 Accepts]: Start accepts. Automaton has 356 states and 480 transitions. Word has length 26 [2021-11-02 22:39:02,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:02,348 INFO L470 AbstractCegarLoop]: Abstraction has 356 states and 480 transitions. [2021-11-02 22:39:02,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:02,348 INFO L276 IsEmpty]: Start isEmpty. Operand 356 states and 480 transitions. [2021-11-02 22:39:02,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-02 22:39:02,349 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:02,349 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:02,389 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-02 22:39:02,575 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-02 22:39:02,575 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:39:02,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:02,576 INFO L85 PathProgramCache]: Analyzing trace with hash -833380899, now seen corresponding path program 5 times [2021-11-02 22:39:02,576 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:02,576 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [115734955] [2021-11-02 22:39:02,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:02,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:02,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:02,790 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:02,790 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:02,791 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [115734955] [2021-11-02 22:39:02,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [115734955] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:02,791 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1037809358] [2021-11-02 22:39:02,791 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:39:02,791 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:02,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:02,795 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:02,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-02 22:39:03,334 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-02 22:39:03,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:03,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-02 22:39:03,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:03,523 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:39:03,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1037809358] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:03,524 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:03,524 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8] total 21 [2021-11-02 22:39:03,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43688347] [2021-11-02 22:39:03,525 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-02 22:39:03,525 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:03,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-02 22:39:03,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2021-11-02 22:39:03,526 INFO L87 Difference]: Start difference. First operand 356 states and 480 transitions. Second operand has 21 states, 21 states have (on average 2.142857142857143) internal successors, (45), 21 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:13,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:13,906 INFO L93 Difference]: Finished difference Result 1253 states and 1620 transitions. [2021-11-02 22:39:13,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 152 states. [2021-11-02 22:39:13,907 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.142857142857143) internal successors, (45), 21 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-11-02 22:39:13,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:13,912 INFO L225 Difference]: With dead ends: 1253 [2021-11-02 22:39:13,912 INFO L226 Difference]: Without dead ends: 1168 [2021-11-02 22:39:13,922 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10692 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=1863, Invalid=26193, Unknown=0, NotChecked=0, Total=28056 [2021-11-02 22:39:13,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1168 states. [2021-11-02 22:39:13,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1168 to 426. [2021-11-02 22:39:13,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 426 states, 425 states have (on average 1.3458823529411765) internal successors, (572), 425 states have internal predecessors, (572), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:13,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 426 states to 426 states and 572 transitions. [2021-11-02 22:39:13,950 INFO L78 Accepts]: Start accepts. Automaton has 426 states and 572 transitions. Word has length 27 [2021-11-02 22:39:13,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:13,950 INFO L470 AbstractCegarLoop]: Abstraction has 426 states and 572 transitions. [2021-11-02 22:39:13,950 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.142857142857143) internal successors, (45), 21 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:13,951 INFO L276 IsEmpty]: Start isEmpty. Operand 426 states and 572 transitions. [2021-11-02 22:39:13,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-02 22:39:13,952 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:13,952 INFO L513 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:13,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-02 22:39:14,158 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:14,158 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:39:14,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:14,159 INFO L85 PathProgramCache]: Analyzing trace with hash 1025384492, now seen corresponding path program 15 times [2021-11-02 22:39:14,159 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:14,159 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719422600] [2021-11-02 22:39:14,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:14,159 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:14,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:14,449 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:14,449 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:14,449 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719422600] [2021-11-02 22:39:14,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1719422600] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:14,449 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [847805451] [2021-11-02 22:39:14,449 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:39:14,450 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:14,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:14,451 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:14,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-02 22:39:15,077 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-02 22:39:15,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:15,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-02 22:39:15,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:15,232 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:15,233 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [847805451] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:15,233 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:15,233 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2021-11-02 22:39:15,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405430179] [2021-11-02 22:39:15,234 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-02 22:39:15,234 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:15,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-02 22:39:15,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:39:15,235 INFO L87 Difference]: Start difference. First operand 426 states and 572 transitions. Second operand has 20 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:16,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:16,026 INFO L93 Difference]: Finished difference Result 619 states and 914 transitions. [2021-11-02 22:39:16,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-02 22:39:16,026 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-11-02 22:39:16,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:16,029 INFO L225 Difference]: With dead ends: 619 [2021-11-02 22:39:16,029 INFO L226 Difference]: Without dead ends: 587 [2021-11-02 22:39:16,029 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=377, Unknown=0, NotChecked=0, Total=420 [2021-11-02 22:39:16,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 587 states. [2021-11-02 22:39:16,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 587 to 452. [2021-11-02 22:39:16,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 451 states have (on average 1.3503325942350333) internal successors, (609), 451 states have internal predecessors, (609), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:16,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 609 transitions. [2021-11-02 22:39:16,051 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 609 transitions. Word has length 27 [2021-11-02 22:39:16,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:16,052 INFO L470 AbstractCegarLoop]: Abstraction has 452 states and 609 transitions. [2021-11-02 22:39:16,052 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:16,052 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 609 transitions. [2021-11-02 22:39:16,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-02 22:39:16,053 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:16,054 INFO L513 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:16,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-02 22:39:16,260 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-02 22:39:16,260 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:39:16,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:16,260 INFO L85 PathProgramCache]: Analyzing trace with hash -119338265, now seen corresponding path program 16 times [2021-11-02 22:39:16,260 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:16,260 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717592106] [2021-11-02 22:39:16,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:16,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:16,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:16,571 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:16,571 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:16,571 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717592106] [2021-11-02 22:39:16,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [717592106] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:16,571 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1742039832] [2021-11-02 22:39:16,571 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:39:16,572 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:16,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:16,573 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:16,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-02 22:39:16,887 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:39:16,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:16,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-02 22:39:16,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:17,056 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:17,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1742039832] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:17,057 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:17,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2021-11-02 22:39:17,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963311101] [2021-11-02 22:39:17,057 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-02 22:39:17,057 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:17,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-02 22:39:17,058 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2021-11-02 22:39:17,058 INFO L87 Difference]: Start difference. First operand 452 states and 609 transitions. Second operand has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 21 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:17,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:17,844 INFO L93 Difference]: Finished difference Result 653 states and 967 transitions. [2021-11-02 22:39:17,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-02 22:39:17,844 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 21 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-02 22:39:17,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:17,846 INFO L225 Difference]: With dead ends: 653 [2021-11-02 22:39:17,847 INFO L226 Difference]: Without dead ends: 621 [2021-11-02 22:39:17,847 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=417, Unknown=0, NotChecked=0, Total=462 [2021-11-02 22:39:17,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 621 states. [2021-11-02 22:39:17,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 621 to 478. [2021-11-02 22:39:17,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 477 states have (on average 1.3542976939203355) internal successors, (646), 477 states have internal predecessors, (646), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:17,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 646 transitions. [2021-11-02 22:39:17,870 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 646 transitions. Word has length 28 [2021-11-02 22:39:17,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:17,871 INFO L470 AbstractCegarLoop]: Abstraction has 478 states and 646 transitions. [2021-11-02 22:39:17,871 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 21 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:17,871 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 646 transitions. [2021-11-02 22:39:17,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-02 22:39:17,872 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:17,872 INFO L513 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:17,914 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-02 22:39:18,099 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-02 22:39:18,099 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:39:18,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:18,100 INFO L85 PathProgramCache]: Analyzing trace with hash -1246005364, now seen corresponding path program 17 times [2021-11-02 22:39:18,100 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:18,100 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251272187] [2021-11-02 22:39:18,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:18,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:18,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:18,460 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:18,460 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:18,460 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251272187] [2021-11-02 22:39:18,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251272187] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:18,460 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [85232403] [2021-11-02 22:39:18,461 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:39:18,461 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:18,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:18,471 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:18,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-02 22:39:21,300 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-02 22:39:21,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:21,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-02 22:39:21,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:21,475 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:21,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [85232403] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:21,476 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:21,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2021-11-02 22:39:21,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789866534] [2021-11-02 22:39:21,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-02 22:39:21,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:21,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-02 22:39:21,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2021-11-02 22:39:21,478 INFO L87 Difference]: Start difference. First operand 478 states and 646 transitions. Second operand has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:22,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:22,321 INFO L93 Difference]: Finished difference Result 687 states and 1020 transitions. [2021-11-02 22:39:22,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-02 22:39:22,322 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-02 22:39:22,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:22,324 INFO L225 Difference]: With dead ends: 687 [2021-11-02 22:39:22,325 INFO L226 Difference]: Without dead ends: 655 [2021-11-02 22:39:22,325 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=47, Invalid=459, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:39:22,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 655 states. [2021-11-02 22:39:22,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 655 to 504. [2021-11-02 22:39:22,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 1.3578528827037772) internal successors, (683), 503 states have internal predecessors, (683), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:22,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 683 transitions. [2021-11-02 22:39:22,349 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 683 transitions. Word has length 29 [2021-11-02 22:39:22,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:22,350 INFO L470 AbstractCegarLoop]: Abstraction has 504 states and 683 transitions. [2021-11-02 22:39:22,350 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:22,350 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 683 transitions. [2021-11-02 22:39:22,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-02 22:39:22,352 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:22,352 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:22,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-02 22:39:22,558 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:22,558 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:39:22,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:22,559 INFO L85 PathProgramCache]: Analyzing trace with hash -1004492410, now seen corresponding path program 7 times [2021-11-02 22:39:22,559 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:22,559 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191934695] [2021-11-02 22:39:22,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:22,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:22,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:23,136 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:39:23,136 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:23,136 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191934695] [2021-11-02 22:39:23,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [191934695] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:23,136 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1897779818] [2021-11-02 22:39:23,137 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:39:23,137 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:23,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:23,139 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:23,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-02 22:39:23,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:23,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-02 22:39:23,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:24,702 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:39:24,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1897779818] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:24,703 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:24,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 20 [2021-11-02 22:39:24,703 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992037612] [2021-11-02 22:39:24,704 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-02 22:39:24,704 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:24,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-02 22:39:24,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=332, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:39:24,705 INFO L87 Difference]: Start difference. First operand 504 states and 683 transitions. Second operand has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:30,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:30,355 INFO L93 Difference]: Finished difference Result 648 states and 827 transitions. [2021-11-02 22:39:30,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-02 22:39:30,356 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-02 22:39:30,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:30,359 INFO L225 Difference]: With dead ends: 648 [2021-11-02 22:39:30,359 INFO L226 Difference]: Without dead ends: 636 [2021-11-02 22:39:30,360 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=86, Invalid=564, Unknown=0, NotChecked=0, Total=650 [2021-11-02 22:39:30,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 636 states. [2021-11-02 22:39:30,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 636 to 512. [2021-11-02 22:39:30,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 512 states, 511 states have (on average 1.356164383561644) internal successors, (693), 511 states have internal predecessors, (693), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:30,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 693 transitions. [2021-11-02 22:39:30,384 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 693 transitions. Word has length 30 [2021-11-02 22:39:30,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:30,385 INFO L470 AbstractCegarLoop]: Abstraction has 512 states and 693 transitions. [2021-11-02 22:39:30,385 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:30,385 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 693 transitions. [2021-11-02 22:39:30,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-02 22:39:30,387 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:30,387 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:30,414 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-02 22:39:30,599 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:30,599 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:39:30,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:30,600 INFO L85 PathProgramCache]: Analyzing trace with hash 1974452903, now seen corresponding path program 4 times [2021-11-02 22:39:30,600 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:30,600 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2010044894] [2021-11-02 22:39:30,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:30,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:30,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:30,741 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-02 22:39:30,741 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:30,741 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2010044894] [2021-11-02 22:39:30,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2010044894] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:30,741 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1917276466] [2021-11-02 22:39:30,741 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:39:30,741 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:30,741 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:30,742 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:30,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-02 22:39:31,327 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:39:31,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:31,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-02 22:39:31,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:31,459 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-02 22:39:31,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1917276466] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:31,459 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:31,459 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2021-11-02 22:39:31,459 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779068777] [2021-11-02 22:39:31,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-02 22:39:31,460 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:31,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-02 22:39:31,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:39:31,460 INFO L87 Difference]: Start difference. First operand 512 states and 693 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:31,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:31,772 INFO L93 Difference]: Finished difference Result 589 states and 783 transitions. [2021-11-02 22:39:31,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-02 22:39:31,773 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-02 22:39:31,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:31,776 INFO L225 Difference]: With dead ends: 589 [2021-11-02 22:39:31,777 INFO L226 Difference]: Without dead ends: 571 [2021-11-02 22:39:31,777 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:39:31,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 571 states. [2021-11-02 22:39:31,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 571 to 512. [2021-11-02 22:39:31,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 512 states, 511 states have (on average 1.3542074363992171) internal successors, (692), 511 states have internal predecessors, (692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:31,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 692 transitions. [2021-11-02 22:39:31,803 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 692 transitions. Word has length 30 [2021-11-02 22:39:31,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:31,804 INFO L470 AbstractCegarLoop]: Abstraction has 512 states and 692 transitions. [2021-11-02 22:39:31,804 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:31,804 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 692 transitions. [2021-11-02 22:39:31,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-02 22:39:31,806 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:31,806 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:31,849 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-02 22:39:32,019 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-02 22:39:32,019 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:39:32,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:32,020 INFO L85 PathProgramCache]: Analyzing trace with hash 1893940903, now seen corresponding path program 6 times [2021-11-02 22:39:32,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:32,020 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712702494] [2021-11-02 22:39:32,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:32,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:32,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:32,299 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:32,299 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:32,299 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712702494] [2021-11-02 22:39:32,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1712702494] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:32,299 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1635225623] [2021-11-02 22:39:32,300 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:39:32,300 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:32,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:32,300 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:32,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-02 22:39:32,703 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-11-02 22:39:32,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:32,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-02 22:39:32,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:33,070 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-02 22:39:33,071 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1635225623] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:33,071 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:33,071 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 12] total 27 [2021-11-02 22:39:33,071 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239546314] [2021-11-02 22:39:33,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-02 22:39:33,072 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:33,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-02 22:39:33,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2021-11-02 22:39:33,073 INFO L87 Difference]: Start difference. First operand 512 states and 692 transitions. Second operand has 27 states, 27 states have (on average 1.962962962962963) internal successors, (53), 27 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:38,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:38,795 INFO L93 Difference]: Finished difference Result 1064 states and 1421 transitions. [2021-11-02 22:39:38,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 157 states. [2021-11-02 22:39:38,796 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.962962962962963) internal successors, (53), 27 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-02 22:39:38,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:38,801 INFO L225 Difference]: With dead ends: 1064 [2021-11-02 22:39:38,801 INFO L226 Difference]: Without dead ends: 958 [2021-11-02 22:39:38,804 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10847 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=844, Invalid=29258, Unknown=0, NotChecked=0, Total=30102 [2021-11-02 22:39:38,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 958 states. [2021-11-02 22:39:38,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 958 to 556. [2021-11-02 22:39:38,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 556 states, 555 states have (on average 1.3513513513513513) internal successors, (750), 555 states have internal predecessors, (750), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:38,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 556 states to 556 states and 750 transitions. [2021-11-02 22:39:38,834 INFO L78 Accepts]: Start accepts. Automaton has 556 states and 750 transitions. Word has length 30 [2021-11-02 22:39:38,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:38,835 INFO L470 AbstractCegarLoop]: Abstraction has 556 states and 750 transitions. [2021-11-02 22:39:38,835 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.962962962962963) internal successors, (53), 27 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:38,835 INFO L276 IsEmpty]: Start isEmpty. Operand 556 states and 750 transitions. [2021-11-02 22:39:38,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-02 22:39:38,837 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:38,837 INFO L513 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:38,887 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-02 22:39:39,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:39,063 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:39:39,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:39,064 INFO L85 PathProgramCache]: Analyzing trace with hash -1812947065, now seen corresponding path program 18 times [2021-11-02 22:39:39,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:39,064 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1606611334] [2021-11-02 22:39:39,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:39,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:39,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:39,504 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:39,504 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:39,504 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1606611334] [2021-11-02 22:39:39,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1606611334] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:39,504 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [649924384] [2021-11-02 22:39:39,504 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:39:39,504 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:39,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:39,505 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:39,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-02 22:39:40,416 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-11-02 22:39:40,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:40,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-02 22:39:40,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:40,588 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:40,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [649924384] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:40,588 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:40,588 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2021-11-02 22:39:40,588 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258113813] [2021-11-02 22:39:40,589 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-02 22:39:40,589 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:40,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-02 22:39:40,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:39:40,590 INFO L87 Difference]: Start difference. First operand 556 states and 750 transitions. Second operand has 23 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:41,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:41,576 INFO L93 Difference]: Finished difference Result 783 states and 1154 transitions. [2021-11-02 22:39:41,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-02 22:39:41,577 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-02 22:39:41,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:41,580 INFO L225 Difference]: With dead ends: 783 [2021-11-02 22:39:41,580 INFO L226 Difference]: Without dead ends: 751 [2021-11-02 22:39:41,580 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=503, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:39:41,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 751 states. [2021-11-02 22:39:41,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 751 to 584. [2021-11-02 22:39:41,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 584 states, 583 states have (on average 1.3550600343053174) internal successors, (790), 583 states have internal predecessors, (790), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:41,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 584 states to 584 states and 790 transitions. [2021-11-02 22:39:41,608 INFO L78 Accepts]: Start accepts. Automaton has 584 states and 790 transitions. Word has length 30 [2021-11-02 22:39:41,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:41,608 INFO L470 AbstractCegarLoop]: Abstraction has 584 states and 790 transitions. [2021-11-02 22:39:41,608 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:41,609 INFO L276 IsEmpty]: Start isEmpty. Operand 584 states and 790 transitions. [2021-11-02 22:39:41,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-02 22:39:41,610 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:41,610 INFO L513 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:41,631 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2021-11-02 22:39:41,817 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-02 22:39:41,817 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:39:41,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:41,817 INFO L85 PathProgramCache]: Analyzing trace with hash 2086696684, now seen corresponding path program 19 times [2021-11-02 22:39:41,817 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:41,818 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530287418] [2021-11-02 22:39:41,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:41,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:41,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:42,243 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:42,244 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:42,244 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530287418] [2021-11-02 22:39:42,244 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530287418] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:42,244 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [465979615] [2021-11-02 22:39:42,244 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:39:42,244 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:42,245 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:42,246 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:42,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-02 22:39:42,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:42,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-02 22:39:42,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:42,888 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:42,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [465979615] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:42,888 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:42,888 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2021-11-02 22:39:42,888 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866792283] [2021-11-02 22:39:42,888 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-02 22:39:42,889 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:42,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-02 22:39:42,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:39:42,889 INFO L87 Difference]: Start difference. First operand 584 states and 790 transitions. Second operand has 24 states, 24 states have (on average 1.375) internal successors, (33), 24 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:43,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:43,995 INFO L93 Difference]: Finished difference Result 819 states and 1210 transitions. [2021-11-02 22:39:43,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-02 22:39:43,995 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.375) internal successors, (33), 24 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-02 22:39:43,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:43,999 INFO L225 Difference]: With dead ends: 819 [2021-11-02 22:39:43,999 INFO L226 Difference]: Without dead ends: 787 [2021-11-02 22:39:43,999 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=549, Unknown=0, NotChecked=0, Total=600 [2021-11-02 22:39:44,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 787 states. [2021-11-02 22:39:44,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 787 to 612. [2021-11-02 22:39:44,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 612 states, 611 states have (on average 1.358428805237316) internal successors, (830), 611 states have internal predecessors, (830), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:44,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 612 states to 612 states and 830 transitions. [2021-11-02 22:39:44,026 INFO L78 Accepts]: Start accepts. Automaton has 612 states and 830 transitions. Word has length 31 [2021-11-02 22:39:44,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:44,027 INFO L470 AbstractCegarLoop]: Abstraction has 612 states and 830 transitions. [2021-11-02 22:39:44,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.375) internal successors, (33), 24 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:44,027 INFO L276 IsEmpty]: Start isEmpty. Operand 612 states and 830 transitions. [2021-11-02 22:39:44,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-02 22:39:44,029 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:44,029 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:44,065 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2021-11-02 22:39:44,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-02 22:39:44,255 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:39:44,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:44,255 INFO L85 PathProgramCache]: Analyzing trace with hash 1240928360, now seen corresponding path program 8 times [2021-11-02 22:39:44,256 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:44,256 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909967064] [2021-11-02 22:39:44,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:44,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:44,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:44,347 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-02 22:39:44,348 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:44,348 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909967064] [2021-11-02 22:39:44,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1909967064] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:44,349 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [473040403] [2021-11-02 22:39:44,349 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:39:44,349 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:44,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:44,350 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:44,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-02 22:39:44,797 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:39:44,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:44,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-02 22:39:44,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:44,895 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-02 22:39:44,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [473040403] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:44,896 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:44,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-11-02 22:39:44,896 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537571793] [2021-11-02 22:39:44,896 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:39:44,896 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:44,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:39:44,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:39:44,897 INFO L87 Difference]: Start difference. First operand 612 states and 830 transitions. Second operand has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:44,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:44,977 INFO L93 Difference]: Finished difference Result 1079 states and 1417 transitions. [2021-11-02 22:39:44,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:39:44,978 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-02 22:39:44,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:44,984 INFO L225 Difference]: With dead ends: 1079 [2021-11-02 22:39:44,984 INFO L226 Difference]: Without dead ends: 918 [2021-11-02 22:39:44,985 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:39:44,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 918 states. [2021-11-02 22:39:45,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 918 to 575. [2021-11-02 22:39:45,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.3449477351916377) internal successors, (772), 574 states have internal predecessors, (772), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:45,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 772 transitions. [2021-11-02 22:39:45,014 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 772 transitions. Word has length 32 [2021-11-02 22:39:45,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:45,014 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 772 transitions. [2021-11-02 22:39:45,014 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:45,014 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 772 transitions. [2021-11-02 22:39:45,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-02 22:39:45,016 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:45,016 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:45,063 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-02 22:39:45,243 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-02 22:39:45,243 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:39:45,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:45,244 INFO L85 PathProgramCache]: Analyzing trace with hash 380203431, now seen corresponding path program 9 times [2021-11-02 22:39:45,244 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:45,244 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1176160023] [2021-11-02 22:39:45,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:45,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:45,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:45,370 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-02 22:39:45,370 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:45,370 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1176160023] [2021-11-02 22:39:45,370 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1176160023] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:45,370 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [819804527] [2021-11-02 22:39:45,370 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:39:45,371 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:45,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:45,375 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:45,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-02 22:39:46,055 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-02 22:39:46,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:46,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-02 22:39:46,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:46,200 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-02 22:39:46,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [819804527] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:46,201 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:46,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2021-11-02 22:39:46,201 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320824811] [2021-11-02 22:39:46,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-02 22:39:46,202 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:46,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-02 22:39:46,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:39:46,202 INFO L87 Difference]: Start difference. First operand 575 states and 772 transitions. Second operand has 13 states, 13 states have (on average 2.769230769230769) internal successors, (36), 13 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:46,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:46,694 INFO L93 Difference]: Finished difference Result 1456 states and 1981 transitions. [2021-11-02 22:39:46,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-02 22:39:46,695 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.769230769230769) internal successors, (36), 13 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-02 22:39:46,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:46,700 INFO L225 Difference]: With dead ends: 1456 [2021-11-02 22:39:46,700 INFO L226 Difference]: Without dead ends: 1280 [2021-11-02 22:39:46,701 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=148, Invalid=314, Unknown=0, NotChecked=0, Total=462 [2021-11-02 22:39:46,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1280 states. [2021-11-02 22:39:46,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1280 to 655. [2021-11-02 22:39:46,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 655 states, 654 states have (on average 1.3654434250764527) internal successors, (893), 654 states have internal predecessors, (893), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:46,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 655 states to 655 states and 893 transitions. [2021-11-02 22:39:46,726 INFO L78 Accepts]: Start accepts. Automaton has 655 states and 893 transitions. Word has length 32 [2021-11-02 22:39:46,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:46,726 INFO L470 AbstractCegarLoop]: Abstraction has 655 states and 893 transitions. [2021-11-02 22:39:46,726 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.769230769230769) internal successors, (36), 13 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:46,727 INFO L276 IsEmpty]: Start isEmpty. Operand 655 states and 893 transitions. [2021-11-02 22:39:46,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-02 22:39:46,728 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:46,729 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:46,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-02 22:39:46,943 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-02 22:39:46,943 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:39:46,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:46,944 INFO L85 PathProgramCache]: Analyzing trace with hash -404867559, now seen corresponding path program 5 times [2021-11-02 22:39:46,944 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:46,944 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901387684] [2021-11-02 22:39:46,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:46,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:46,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:47,131 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-02 22:39:47,131 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:47,132 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1901387684] [2021-11-02 22:39:47,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1901387684] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:47,132 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [307283994] [2021-11-02 22:39:47,132 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:39:47,133 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:47,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:47,135 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:47,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-02 22:39:47,805 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-02 22:39:47,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:47,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-02 22:39:47,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:48,056 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:39:48,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [307283994] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:48,057 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:48,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 18] total 19 [2021-11-02 22:39:48,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92834420] [2021-11-02 22:39:48,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-02 22:39:48,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:48,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-02 22:39:48,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=299, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:39:48,059 INFO L87 Difference]: Start difference. First operand 655 states and 893 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:48,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:48,486 INFO L93 Difference]: Finished difference Result 765 states and 1021 transitions. [2021-11-02 22:39:48,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-02 22:39:48,486 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-02 22:39:48,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:48,490 INFO L225 Difference]: With dead ends: 765 [2021-11-02 22:39:48,490 INFO L226 Difference]: Without dead ends: 746 [2021-11-02 22:39:48,490 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=73, Invalid=527, Unknown=0, NotChecked=0, Total=600 [2021-11-02 22:39:48,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 746 states. [2021-11-02 22:39:48,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 746 to 655. [2021-11-02 22:39:48,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 655 states, 654 states have (on average 1.363914373088685) internal successors, (892), 654 states have internal predecessors, (892), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:48,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 655 states to 655 states and 892 transitions. [2021-11-02 22:39:48,518 INFO L78 Accepts]: Start accepts. Automaton has 655 states and 892 transitions. Word has length 32 [2021-11-02 22:39:48,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:48,519 INFO L470 AbstractCegarLoop]: Abstraction has 655 states and 892 transitions. [2021-11-02 22:39:48,519 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:48,519 INFO L276 IsEmpty]: Start isEmpty. Operand 655 states and 892 transitions. [2021-11-02 22:39:48,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-02 22:39:48,520 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:48,521 INFO L513 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:48,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-02 22:39:48,727 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-11-02 22:39:48,727 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:39:48,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:48,728 INFO L85 PathProgramCache]: Analyzing trace with hash -1578398681, now seen corresponding path program 20 times [2021-11-02 22:39:48,728 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:48,728 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1619590128] [2021-11-02 22:39:48,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:48,728 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:48,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:49,148 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:49,149 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:49,149 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1619590128] [2021-11-02 22:39:49,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1619590128] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:49,149 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1078809367] [2021-11-02 22:39:49,149 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:39:49,149 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:49,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:49,150 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:49,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-02 22:39:49,625 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:39:49,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:49,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-02 22:39:49,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:49,823 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:49,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1078809367] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:49,823 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:49,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2021-11-02 22:39:49,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803230914] [2021-11-02 22:39:49,823 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-02 22:39:49,823 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:49,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-02 22:39:49,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2021-11-02 22:39:49,824 INFO L87 Difference]: Start difference. First operand 655 states and 892 transitions. Second operand has 25 states, 25 states have (on average 1.36) internal successors, (34), 25 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:50,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:50,997 INFO L93 Difference]: Finished difference Result 949 states and 1428 transitions. [2021-11-02 22:39:50,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-02 22:39:50,998 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.36) internal successors, (34), 25 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-02 22:39:50,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:51,002 INFO L225 Difference]: With dead ends: 949 [2021-11-02 22:39:51,002 INFO L226 Difference]: Without dead ends: 911 [2021-11-02 22:39:51,002 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=597, Unknown=0, NotChecked=0, Total=650 [2021-11-02 22:39:51,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 911 states. [2021-11-02 22:39:51,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 911 to 687. [2021-11-02 22:39:51,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 687 states, 686 states have (on average 1.3673469387755102) internal successors, (938), 686 states have internal predecessors, (938), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:51,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 687 states to 687 states and 938 transitions. [2021-11-02 22:39:51,036 INFO L78 Accepts]: Start accepts. Automaton has 687 states and 938 transitions. Word has length 32 [2021-11-02 22:39:51,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:51,036 INFO L470 AbstractCegarLoop]: Abstraction has 687 states and 938 transitions. [2021-11-02 22:39:51,036 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.36) internal successors, (34), 25 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:51,037 INFO L276 IsEmpty]: Start isEmpty. Operand 687 states and 938 transitions. [2021-11-02 22:39:51,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-02 22:39:51,038 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:51,039 INFO L513 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:51,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-02 22:39:51,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:51,255 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:39:51,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:51,255 INFO L85 PathProgramCache]: Analyzing trace with hash 767761996, now seen corresponding path program 21 times [2021-11-02 22:39:51,256 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:51,256 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [676326897] [2021-11-02 22:39:51,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:51,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:51,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:51,745 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:51,745 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:51,745 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [676326897] [2021-11-02 22:39:51,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [676326897] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:51,746 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [780423797] [2021-11-02 22:39:51,746 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:39:51,746 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:51,746 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:51,747 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:51,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-02 22:39:52,719 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-02 22:39:52,719 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:52,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-02 22:39:52,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:52,986 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:52,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [780423797] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:52,986 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:52,987 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26] total 28 [2021-11-02 22:39:52,987 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390157968] [2021-11-02 22:39:52,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-02 22:39:52,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:52,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-02 22:39:52,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=700, Unknown=0, NotChecked=0, Total=756 [2021-11-02 22:39:52,988 INFO L87 Difference]: Start difference. First operand 687 states and 938 transitions. Second operand has 28 states, 28 states have (on average 1.3571428571428572) internal successors, (38), 28 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:54,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:54,546 INFO L93 Difference]: Finished difference Result 999 states and 1507 transitions. [2021-11-02 22:39:54,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-02 22:39:54,546 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.3571428571428572) internal successors, (38), 28 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-02 22:39:54,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:54,551 INFO L225 Difference]: With dead ends: 999 [2021-11-02 22:39:54,551 INFO L226 Difference]: Without dead ends: 961 [2021-11-02 22:39:54,551 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=62, Invalid=750, Unknown=0, NotChecked=0, Total=812 [2021-11-02 22:39:54,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 961 states. [2021-11-02 22:39:54,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 961 to 719. [2021-11-02 22:39:54,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 719 states, 718 states have (on average 1.3704735376044568) internal successors, (984), 718 states have internal predecessors, (984), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:54,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 719 states to 719 states and 984 transitions. [2021-11-02 22:39:54,574 INFO L78 Accepts]: Start accepts. Automaton has 719 states and 984 transitions. Word has length 33 [2021-11-02 22:39:54,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:54,574 INFO L470 AbstractCegarLoop]: Abstraction has 719 states and 984 transitions. [2021-11-02 22:39:54,575 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.3571428571428572) internal successors, (38), 28 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:54,575 INFO L276 IsEmpty]: Start isEmpty. Operand 719 states and 984 transitions. [2021-11-02 22:39:54,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-02 22:39:54,577 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:54,577 INFO L513 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:54,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-02 22:39:54,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:54,777 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:39:54,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:54,778 INFO L85 PathProgramCache]: Analyzing trace with hash -1111633127, now seen corresponding path program 7 times [2021-11-02 22:39:54,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:54,778 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2051045264] [2021-11-02 22:39:54,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:54,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:54,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:55,065 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-02 22:39:55,066 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:55,066 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2051045264] [2021-11-02 22:39:55,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2051045264] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:55,066 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2018117696] [2021-11-02 22:39:55,066 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:39:55,066 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:55,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:55,067 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:55,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-02 22:39:55,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:55,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-02 22:39:55,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:55,898 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-02 22:39:55,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2018117696] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:55,899 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:55,899 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 26 [2021-11-02 22:39:55,899 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078434754] [2021-11-02 22:39:55,899 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-02 22:39:55,899 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:55,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-02 22:39:55,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=585, Unknown=0, NotChecked=0, Total=650 [2021-11-02 22:39:55,900 INFO L87 Difference]: Start difference. First operand 719 states and 984 transitions. Second operand has 26 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:58,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:58,262 INFO L93 Difference]: Finished difference Result 1248 states and 1737 transitions. [2021-11-02 22:39:58,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-02 22:39:58,263 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-02 22:39:58,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:58,268 INFO L225 Difference]: With dead ends: 1248 [2021-11-02 22:39:58,268 INFO L226 Difference]: Without dead ends: 1109 [2021-11-02 22:39:58,269 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1653 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=265, Invalid=5435, Unknown=0, NotChecked=0, Total=5700 [2021-11-02 22:39:58,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1109 states. [2021-11-02 22:39:58,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1109 to 767. [2021-11-02 22:39:58,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 767 states, 766 states have (on average 1.3629242819843341) internal successors, (1044), 766 states have internal predecessors, (1044), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:58,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 767 states to 767 states and 1044 transitions. [2021-11-02 22:39:58,297 INFO L78 Accepts]: Start accepts. Automaton has 767 states and 1044 transitions. Word has length 34 [2021-11-02 22:39:58,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:58,298 INFO L470 AbstractCegarLoop]: Abstraction has 767 states and 1044 transitions. [2021-11-02 22:39:58,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:39:58,298 INFO L276 IsEmpty]: Start isEmpty. Operand 767 states and 1044 transitions. [2021-11-02 22:39:58,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-02 22:39:58,300 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:58,300 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:58,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-02 22:39:58,527 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-11-02 22:39:58,527 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:39:58,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:58,528 INFO L85 PathProgramCache]: Analyzing trace with hash -2062692825, now seen corresponding path program 6 times [2021-11-02 22:39:58,528 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:58,528 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [181863047] [2021-11-02 22:39:58,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:58,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:58,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:58,744 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-02 22:39:58,744 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:58,744 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [181863047] [2021-11-02 22:39:58,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [181863047] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:58,744 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231810317] [2021-11-02 22:39:58,744 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:39:58,744 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:58,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:58,745 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:58,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-02 22:39:59,484 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-02 22:39:59,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:59,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-02 22:39:59,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:59,614 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-02 22:39:59,615 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231810317] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:59,615 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:59,615 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-11-02 22:39:59,615 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064970739] [2021-11-02 22:39:59,615 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-02 22:39:59,615 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:59,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-02 22:39:59,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:39:59,616 INFO L87 Difference]: Start difference. First operand 767 states and 1044 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:40:00,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:40:00,081 INFO L93 Difference]: Finished difference Result 887 states and 1184 transitions. [2021-11-02 22:40:00,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-02 22:40:00,082 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-02 22:40:00,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:40:00,086 INFO L225 Difference]: With dead ends: 887 [2021-11-02 22:40:00,086 INFO L226 Difference]: Without dead ends: 867 [2021-11-02 22:40:00,087 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2021-11-02 22:40:00,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 867 states. [2021-11-02 22:40:00,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 867 to 767. [2021-11-02 22:40:00,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 767 states, 766 states have (on average 1.3616187989556137) internal successors, (1043), 766 states have internal predecessors, (1043), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:40:00,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 767 states to 767 states and 1043 transitions. [2021-11-02 22:40:00,110 INFO L78 Accepts]: Start accepts. Automaton has 767 states and 1043 transitions. Word has length 34 [2021-11-02 22:40:00,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:40:00,110 INFO L470 AbstractCegarLoop]: Abstraction has 767 states and 1043 transitions. [2021-11-02 22:40:00,111 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:40:00,111 INFO L276 IsEmpty]: Start isEmpty. Operand 767 states and 1043 transitions. [2021-11-02 22:40:00,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-02 22:40:00,112 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:40:00,112 INFO L513 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:40:00,117 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-02 22:40:00,312 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-11-02 22:40:00,313 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:40:00,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:40:00,313 INFO L85 PathProgramCache]: Analyzing trace with hash 484298951, now seen corresponding path program 22 times [2021-11-02 22:40:00,313 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:40:00,313 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032868655] [2021-11-02 22:40:00,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:40:00,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:40:00,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:40:00,888 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:40:00,888 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:40:00,889 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032868655] [2021-11-02 22:40:00,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1032868655] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:40:00,889 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [840397108] [2021-11-02 22:40:00,889 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:40:00,889 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:40:00,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:40:00,891 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:40:00,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-02 22:40:01,608 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:40:01,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:40:01,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-02 22:40:01,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:40:01,784 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:40:01,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [840397108] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:40:01,784 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:40:01,784 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 27 [2021-11-02 22:40:01,784 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421959821] [2021-11-02 22:40:01,784 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-02 22:40:01,785 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:40:01,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-02 22:40:01,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=650, Unknown=0, NotChecked=0, Total=702 [2021-11-02 22:40:01,785 INFO L87 Difference]: Start difference. First operand 767 states and 1043 transitions. Second operand has 27 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 27 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:40:03,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:40:03,187 INFO L93 Difference]: Finished difference Result 1083 states and 1622 transitions. [2021-11-02 22:40:03,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-02 22:40:03,188 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 27 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-02 22:40:03,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:40:03,192 INFO L225 Difference]: With dead ends: 1083 [2021-11-02 22:40:03,192 INFO L226 Difference]: Without dead ends: 1045 [2021-11-02 22:40:03,193 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=57, Invalid=699, Unknown=0, NotChecked=0, Total=756 [2021-11-02 22:40:03,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1045 states. [2021-11-02 22:40:03,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1045 to 801. [2021-11-02 22:40:03,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 801 states, 800 states have (on average 1.365) internal successors, (1092), 800 states have internal predecessors, (1092), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:40:03,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 801 states to 801 states and 1092 transitions. [2021-11-02 22:40:03,217 INFO L78 Accepts]: Start accepts. Automaton has 801 states and 1092 transitions. Word has length 34 [2021-11-02 22:40:03,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:40:03,218 INFO L470 AbstractCegarLoop]: Abstraction has 801 states and 1092 transitions. [2021-11-02 22:40:03,218 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 27 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:40:03,218 INFO L276 IsEmpty]: Start isEmpty. Operand 801 states and 1092 transitions. [2021-11-02 22:40:03,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-02 22:40:03,219 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:40:03,220 INFO L513 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:40:03,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-02 22:40:03,422 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-02 22:40:03,422 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:40:03,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:40:03,422 INFO L85 PathProgramCache]: Analyzing trace with hash 286879148, now seen corresponding path program 23 times [2021-11-02 22:40:03,423 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:40:03,423 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643503163] [2021-11-02 22:40:03,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:40:03,423 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:40:03,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:40:04,020 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:40:04,020 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:40:04,020 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643503163] [2021-11-02 22:40:04,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1643503163] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:40:04,021 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [605196522] [2021-11-02 22:40:04,021 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:40:04,021 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:40:04,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:40:04,023 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:40:04,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-02 22:40:08,774 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-11-02 22:40:08,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:40:08,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-02 22:40:08,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:40:09,005 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:40:09,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [605196522] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:40:09,006 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:40:09,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2021-11-02 22:40:09,006 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407714692] [2021-11-02 22:40:09,006 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-02 22:40:09,006 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:40:09,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-02 22:40:09,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=702, Unknown=0, NotChecked=0, Total=756 [2021-11-02 22:40:09,007 INFO L87 Difference]: Start difference. First operand 801 states and 1092 transitions. Second operand has 28 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 28 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:40:10,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:40:10,558 INFO L93 Difference]: Finished difference Result 1127 states and 1691 transitions. [2021-11-02 22:40:10,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-02 22:40:10,559 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 28 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-02 22:40:10,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:40:10,563 INFO L225 Difference]: With dead ends: 1127 [2021-11-02 22:40:10,563 INFO L226 Difference]: Without dead ends: 1089 [2021-11-02 22:40:10,564 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=59, Invalid=753, Unknown=0, NotChecked=0, Total=812 [2021-11-02 22:40:10,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1089 states. [2021-11-02 22:40:10,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1089 to 835. [2021-11-02 22:40:10,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 835 states, 834 states have (on average 1.36810551558753) internal successors, (1141), 834 states have internal predecessors, (1141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:40:10,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 835 states to 835 states and 1141 transitions. [2021-11-02 22:40:10,589 INFO L78 Accepts]: Start accepts. Automaton has 835 states and 1141 transitions. Word has length 35 [2021-11-02 22:40:10,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:40:10,590 INFO L470 AbstractCegarLoop]: Abstraction has 835 states and 1141 transitions. [2021-11-02 22:40:10,590 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 28 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:40:10,590 INFO L276 IsEmpty]: Start isEmpty. Operand 835 states and 1141 transitions. [2021-11-02 22:40:10,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-02 22:40:10,591 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:40:10,591 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:40:10,600 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-02 22:40:10,791 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-02 22:40:10,792 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:40:10,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:40:10,792 INFO L85 PathProgramCache]: Analyzing trace with hash 1563221799, now seen corresponding path program 10 times [2021-11-02 22:40:10,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:40:10,792 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1976126468] [2021-11-02 22:40:10,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:40:10,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:40:10,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:40:11,524 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-02 22:40:11,524 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:40:11,524 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1976126468] [2021-11-02 22:40:11,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1976126468] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:40:11,525 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1349656818] [2021-11-02 22:40:11,525 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:40:11,525 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:40:11,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:40:11,527 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:40:11,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-02 22:40:12,357 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:40:12,358 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:40:12,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-02 22:40:12,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:40:13,723 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-02 22:40:13,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1349656818] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:40:13,724 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:40:13,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 19 [2021-11-02 22:40:13,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377231572] [2021-11-02 22:40:13,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-02 22:40:13,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:40:13,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-02 22:40:13,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=302, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:40:13,725 INFO L87 Difference]: Start difference. First operand 835 states and 1141 transitions. Second operand has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 19 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:40:16,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:40:16,768 INFO L93 Difference]: Finished difference Result 849 states and 1154 transitions. [2021-11-02 22:40:16,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-02 22:40:16,769 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 19 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-02 22:40:16,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:40:16,772 INFO L225 Difference]: With dead ends: 849 [2021-11-02 22:40:16,773 INFO L226 Difference]: Without dead ends: 819 [2021-11-02 22:40:16,773 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=85, Invalid=617, Unknown=0, NotChecked=0, Total=702 [2021-11-02 22:40:16,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 819 states. [2021-11-02 22:40:16,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 819 to 819. [2021-11-02 22:40:16,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 819 states, 818 states have (on average 1.374083129584352) internal successors, (1124), 818 states have internal predecessors, (1124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:40:16,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 819 states to 819 states and 1124 transitions. [2021-11-02 22:40:16,805 INFO L78 Accepts]: Start accepts. Automaton has 819 states and 1124 transitions. Word has length 36 [2021-11-02 22:40:16,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:40:16,805 INFO L470 AbstractCegarLoop]: Abstraction has 819 states and 1124 transitions. [2021-11-02 22:40:16,805 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 19 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:40:16,805 INFO L276 IsEmpty]: Start isEmpty. Operand 819 states and 1124 transitions. [2021-11-02 22:40:16,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-02 22:40:16,807 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:40:16,807 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:40:16,856 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-02 22:40:17,035 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-02 22:40:17,035 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:40:17,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:40:17,035 INFO L85 PathProgramCache]: Analyzing trace with hash 61818599, now seen corresponding path program 8 times [2021-11-02 22:40:17,036 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:40:17,036 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [994700889] [2021-11-02 22:40:17,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:40:17,036 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:40:17,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:40:17,416 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:40:17,416 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:40:17,416 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [994700889] [2021-11-02 22:40:17,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [994700889] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:40:17,417 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [346764994] [2021-11-02 22:40:17,417 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:40:17,417 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:40:17,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:40:17,418 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:40:17,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-02 22:40:18,046 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:40:18,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:40:18,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-02 22:40:18,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:40:18,388 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 8 proven. 64 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-02 22:40:18,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [346764994] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:40:18,388 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:40:18,388 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 11] total 30 [2021-11-02 22:40:18,388 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895802893] [2021-11-02 22:40:18,388 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-02 22:40:18,389 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:40:18,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-02 22:40:18,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=812, Unknown=0, NotChecked=0, Total=870 [2021-11-02 22:40:18,389 INFO L87 Difference]: Start difference. First operand 819 states and 1124 transitions. Second operand has 30 states, 30 states have (on average 2.0) internal successors, (60), 30 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:20,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:42:20,739 INFO L93 Difference]: Finished difference Result 3099 states and 3898 transitions. [2021-11-02 22:42:20,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 398 states. [2021-11-02 22:42:20,739 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 30 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-02 22:42:20,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:42:20,755 INFO L225 Difference]: With dead ends: 3099 [2021-11-02 22:42:20,756 INFO L226 Difference]: Without dead ends: 2959 [2021-11-02 22:42:20,769 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 457 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 421 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77076 ImplicationChecksByTransitivity, 105.8s TimeCoverageRelationStatistics Valid=7079, Invalid=171427, Unknown=0, NotChecked=0, Total=178506 [2021-11-02 22:42:20,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2959 states. [2021-11-02 22:42:20,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2959 to 846. [2021-11-02 22:42:20,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 846 states, 845 states have (on average 1.375147928994083) internal successors, (1162), 845 states have internal predecessors, (1162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:20,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 846 states to 846 states and 1162 transitions. [2021-11-02 22:42:20,860 INFO L78 Accepts]: Start accepts. Automaton has 846 states and 1162 transitions. Word has length 36 [2021-11-02 22:42:20,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:42:20,860 INFO L470 AbstractCegarLoop]: Abstraction has 846 states and 1162 transitions. [2021-11-02 22:42:20,860 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 30 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:20,861 INFO L276 IsEmpty]: Start isEmpty. Operand 846 states and 1162 transitions. [2021-11-02 22:42:20,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-02 22:42:20,862 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:42:20,862 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:42:20,893 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-02 22:42:21,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:21,063 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:42:21,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:42:21,064 INFO L85 PathProgramCache]: Analyzing trace with hash 837715225, now seen corresponding path program 7 times [2021-11-02 22:42:21,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:42:21,064 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207848965] [2021-11-02 22:42:21,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:42:21,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:42:21,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:42:21,306 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-02 22:42:21,306 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:42:21,306 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207848965] [2021-11-02 22:42:21,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [207848965] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:21,307 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025283291] [2021-11-02 22:42:21,307 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:42:21,307 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:21,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:42:21,311 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:42:21,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-02 22:42:22,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:42:22,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-02 22:42:22,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:42:22,567 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-02 22:42:22,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1025283291] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:22,568 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:42:22,568 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2021-11-02 22:42:22,569 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421033025] [2021-11-02 22:42:22,569 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-02 22:42:22,569 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:42:22,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-02 22:42:22,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=208, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:42:22,570 INFO L87 Difference]: Start difference. First operand 846 states and 1162 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:23,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:42:23,170 INFO L93 Difference]: Finished difference Result 965 states and 1302 transitions. [2021-11-02 22:42:23,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-02 22:42:23,171 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-02 22:42:23,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:42:23,176 INFO L225 Difference]: With dead ends: 965 [2021-11-02 22:42:23,176 INFO L226 Difference]: Without dead ends: 944 [2021-11-02 22:42:23,177 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=62, Invalid=400, Unknown=0, NotChecked=0, Total=462 [2021-11-02 22:42:23,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 944 states. [2021-11-02 22:42:23,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 944 to 846. [2021-11-02 22:42:23,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 846 states, 845 states have (on average 1.3739644970414202) internal successors, (1161), 845 states have internal predecessors, (1161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:23,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 846 states to 846 states and 1161 transitions. [2021-11-02 22:42:23,279 INFO L78 Accepts]: Start accepts. Automaton has 846 states and 1161 transitions. Word has length 36 [2021-11-02 22:42:23,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:42:23,279 INFO L470 AbstractCegarLoop]: Abstraction has 846 states and 1161 transitions. [2021-11-02 22:42:23,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:23,281 INFO L276 IsEmpty]: Start isEmpty. Operand 846 states and 1161 transitions. [2021-11-02 22:42:23,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-02 22:42:23,287 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:42:23,287 INFO L513 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:42:23,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-02 22:42:23,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-02 22:42:23,507 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:42:23,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:42:23,508 INFO L85 PathProgramCache]: Analyzing trace with hash -1538167449, now seen corresponding path program 24 times [2021-11-02 22:42:23,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:42:23,508 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1280702357] [2021-11-02 22:42:23,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:42:23,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:42:23,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:42:24,130 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:42:24,130 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:42:24,130 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1280702357] [2021-11-02 22:42:24,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1280702357] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:24,131 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [122519431] [2021-11-02 22:42:24,131 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:42:24,131 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:24,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:42:24,132 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:42:24,134 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-02 22:42:25,787 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-11-02 22:42:25,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:42:25,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-02 22:42:25,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:42:26,002 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:42:26,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [122519431] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:26,002 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:42:26,002 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 28 [2021-11-02 22:42:26,003 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743518245] [2021-11-02 22:42:26,003 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-02 22:42:26,003 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:42:26,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-02 22:42:26,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2021-11-02 22:42:26,004 INFO L87 Difference]: Start difference. First operand 846 states and 1161 transitions. Second operand has 28 states, 28 states have (on average 1.5) internal successors, (42), 28 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:27,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:42:27,651 INFO L93 Difference]: Finished difference Result 1156 states and 1727 transitions. [2021-11-02 22:42:27,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-02 22:42:27,652 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.5) internal successors, (42), 28 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-02 22:42:27,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:42:27,658 INFO L225 Difference]: With dead ends: 1156 [2021-11-02 22:42:27,658 INFO L226 Difference]: Without dead ends: 1120 [2021-11-02 22:42:27,659 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2021-11-02 22:42:27,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1120 states. [2021-11-02 22:42:27,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1120 to 881. [2021-11-02 22:42:27,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 881 states, 880 states have (on average 1.3772727272727272) internal successors, (1212), 880 states have internal predecessors, (1212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:27,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 881 states to 881 states and 1212 transitions. [2021-11-02 22:42:27,692 INFO L78 Accepts]: Start accepts. Automaton has 881 states and 1212 transitions. Word has length 36 [2021-11-02 22:42:27,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:42:27,693 INFO L470 AbstractCegarLoop]: Abstraction has 881 states and 1212 transitions. [2021-11-02 22:42:27,693 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.5) internal successors, (42), 28 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:27,693 INFO L276 IsEmpty]: Start isEmpty. Operand 881 states and 1212 transitions. [2021-11-02 22:42:27,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-02 22:42:27,694 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:42:27,694 INFO L513 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:42:27,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-02 22:42:27,895 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:27,895 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:42:27,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:42:27,896 INFO L85 PathProgramCache]: Analyzing trace with hash 2014930188, now seen corresponding path program 25 times [2021-11-02 22:42:27,896 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:42:27,896 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608031033] [2021-11-02 22:42:27,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:42:27,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:42:27,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:42:28,617 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:42:28,617 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:42:28,617 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608031033] [2021-11-02 22:42:28,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608031033] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:28,617 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1067856773] [2021-11-02 22:42:28,618 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:42:28,618 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:28,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:42:28,620 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:42:28,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-02 22:42:29,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:42:29,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-02 22:42:29,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:42:29,763 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:42:29,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1067856773] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:29,764 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:42:29,764 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2021-11-02 22:42:29,764 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966515031] [2021-11-02 22:42:29,764 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-02 22:42:29,765 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:42:29,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-02 22:42:29,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=812, Unknown=0, NotChecked=0, Total=870 [2021-11-02 22:42:29,766 INFO L87 Difference]: Start difference. First operand 881 states and 1212 transitions. Second operand has 30 states, 30 states have (on average 1.3) internal successors, (39), 30 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:31,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:42:31,579 INFO L93 Difference]: Finished difference Result 1200 states and 1796 transitions. [2021-11-02 22:42:31,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-02 22:42:31,580 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.3) internal successors, (39), 30 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-02 22:42:31,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:42:31,583 INFO L225 Difference]: With dead ends: 1200 [2021-11-02 22:42:31,583 INFO L226 Difference]: Without dead ends: 1164 [2021-11-02 22:42:31,584 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=63, Invalid=867, Unknown=0, NotChecked=0, Total=930 [2021-11-02 22:42:31,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1164 states. [2021-11-02 22:42:31,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1164 to 916. [2021-11-02 22:42:31,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 916 states, 915 states have (on average 1.380327868852459) internal successors, (1263), 915 states have internal predecessors, (1263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:31,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 916 states to 916 states and 1263 transitions. [2021-11-02 22:42:31,619 INFO L78 Accepts]: Start accepts. Automaton has 916 states and 1263 transitions. Word has length 37 [2021-11-02 22:42:31,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:42:31,619 INFO L470 AbstractCegarLoop]: Abstraction has 916 states and 1263 transitions. [2021-11-02 22:42:31,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.3) internal successors, (39), 30 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:31,620 INFO L276 IsEmpty]: Start isEmpty. Operand 916 states and 1263 transitions. [2021-11-02 22:42:31,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-02 22:42:31,622 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:42:31,622 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:42:31,665 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2021-11-02 22:42:31,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:31,847 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:42:31,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:42:31,848 INFO L85 PathProgramCache]: Analyzing trace with hash -1506070490, now seen corresponding path program 11 times [2021-11-02 22:42:31,848 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:42:31,848 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646887288] [2021-11-02 22:42:31,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:42:31,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:42:31,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:42:32,020 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-02 22:42:32,020 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:42:32,020 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646887288] [2021-11-02 22:42:32,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [646887288] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:32,020 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [30143499] [2021-11-02 22:42:32,020 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:42:32,021 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:32,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:42:32,023 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:42:32,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-02 22:42:33,379 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-02 22:42:33,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:42:33,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-02 22:42:33,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:42:33,508 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-02 22:42:33,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [30143499] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:33,509 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:42:33,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 9 [2021-11-02 22:42:33,510 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348449429] [2021-11-02 22:42:33,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:42:33,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:42:33,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:42:33,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:42:33,511 INFO L87 Difference]: Start difference. First operand 916 states and 1263 transitions. Second operand has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:33,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:42:33,642 INFO L93 Difference]: Finished difference Result 1945 states and 2533 transitions. [2021-11-02 22:42:33,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:42:33,655 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-02 22:42:33,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:42:33,660 INFO L225 Difference]: With dead ends: 1945 [2021-11-02 22:42:33,661 INFO L226 Difference]: Without dead ends: 1711 [2021-11-02 22:42:33,662 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:42:33,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1711 states. [2021-11-02 22:42:33,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1711 to 929. [2021-11-02 22:42:33,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 929 states, 928 states have (on average 1.3502155172413792) internal successors, (1253), 928 states have internal predecessors, (1253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:33,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 929 states to 929 states and 1253 transitions. [2021-11-02 22:42:33,708 INFO L78 Accepts]: Start accepts. Automaton has 929 states and 1253 transitions. Word has length 38 [2021-11-02 22:42:33,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:42:33,708 INFO L470 AbstractCegarLoop]: Abstraction has 929 states and 1253 transitions. [2021-11-02 22:42:33,708 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:33,708 INFO L276 IsEmpty]: Start isEmpty. Operand 929 states and 1253 transitions. [2021-11-02 22:42:33,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-02 22:42:33,709 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:42:33,709 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:42:33,715 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2021-11-02 22:42:33,910 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-11-02 22:42:33,910 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:42:33,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:42:33,910 INFO L85 PathProgramCache]: Analyzing trace with hash 857975207, now seen corresponding path program 8 times [2021-11-02 22:42:33,911 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:42:33,911 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [89169777] [2021-11-02 22:42:33,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:42:33,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:42:33,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:42:34,172 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-02 22:42:34,173 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:42:34,173 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [89169777] [2021-11-02 22:42:34,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [89169777] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:34,173 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494851034] [2021-11-02 22:42:34,173 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:42:34,173 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:34,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:42:34,174 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:42:34,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-02 22:42:34,920 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:42:34,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:42:34,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-02 22:42:34,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:42:35,083 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-02 22:42:35,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494851034] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:35,083 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:42:35,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2021-11-02 22:42:35,084 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680200775] [2021-11-02 22:42:35,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-02 22:42:35,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:42:35,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-02 22:42:35,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=238, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:42:35,085 INFO L87 Difference]: Start difference. First operand 929 states and 1253 transitions. Second operand has 17 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 17 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:35,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:42:35,631 INFO L93 Difference]: Finished difference Result 1074 states and 1421 transitions. [2021-11-02 22:42:35,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-02 22:42:35,631 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 17 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-02 22:42:35,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:42:35,633 INFO L225 Difference]: With dead ends: 1074 [2021-11-02 22:42:35,633 INFO L226 Difference]: Without dead ends: 1052 [2021-11-02 22:42:35,634 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:42:35,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1052 states. [2021-11-02 22:42:35,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1052 to 929. [2021-11-02 22:42:35,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 929 states, 928 states have (on average 1.3491379310344827) internal successors, (1252), 928 states have internal predecessors, (1252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:35,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 929 states to 929 states and 1252 transitions. [2021-11-02 22:42:35,678 INFO L78 Accepts]: Start accepts. Automaton has 929 states and 1252 transitions. Word has length 38 [2021-11-02 22:42:35,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:42:35,679 INFO L470 AbstractCegarLoop]: Abstraction has 929 states and 1252 transitions. [2021-11-02 22:42:35,679 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 17 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:35,679 INFO L276 IsEmpty]: Start isEmpty. Operand 929 states and 1252 transitions. [2021-11-02 22:42:35,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-02 22:42:35,680 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:42:35,681 INFO L513 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:42:35,709 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-02 22:42:35,881 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:35,881 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:42:35,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:42:35,882 INFO L85 PathProgramCache]: Analyzing trace with hash 491807239, now seen corresponding path program 26 times [2021-11-02 22:42:35,882 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:42:35,882 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559958691] [2021-11-02 22:42:35,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:42:35,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:42:35,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:42:36,620 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:42:36,620 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:42:36,620 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559958691] [2021-11-02 22:42:36,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559958691] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:36,620 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [291779430] [2021-11-02 22:42:36,621 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:42:36,621 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:36,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:42:36,622 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:42:36,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-02 22:42:37,629 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:42:37,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:42:37,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-02 22:42:37,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:42:37,862 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:42:37,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [291779430] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:37,862 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:42:37,862 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 31 [2021-11-02 22:42:37,862 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700859138] [2021-11-02 22:42:37,863 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-02 22:42:37,863 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:42:37,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-02 22:42:37,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=870, Unknown=0, NotChecked=0, Total=930 [2021-11-02 22:42:37,864 INFO L87 Difference]: Start difference. First operand 929 states and 1252 transitions. Second operand has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:39,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:42:39,741 INFO L93 Difference]: Finished difference Result 1291 states and 1915 transitions. [2021-11-02 22:42:39,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-02 22:42:39,742 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-02 22:42:39,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:42:39,744 INFO L225 Difference]: With dead ends: 1291 [2021-11-02 22:42:39,745 INFO L226 Difference]: Without dead ends: 1253 [2021-11-02 22:42:39,746 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=65, Invalid=927, Unknown=0, NotChecked=0, Total=992 [2021-11-02 22:42:39,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1253 states. [2021-11-02 22:42:39,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1253 to 964. [2021-11-02 22:42:39,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 964 states, 963 states have (on average 1.35202492211838) internal successors, (1302), 963 states have internal predecessors, (1302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:39,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 964 states to 964 states and 1302 transitions. [2021-11-02 22:42:39,789 INFO L78 Accepts]: Start accepts. Automaton has 964 states and 1302 transitions. Word has length 38 [2021-11-02 22:42:39,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:42:39,789 INFO L470 AbstractCegarLoop]: Abstraction has 964 states and 1302 transitions. [2021-11-02 22:42:39,789 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:39,789 INFO L276 IsEmpty]: Start isEmpty. Operand 964 states and 1302 transitions. [2021-11-02 22:42:39,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-02 22:42:39,790 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:42:39,790 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:42:39,818 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Ended with exit code 0 [2021-11-02 22:42:39,991 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:39,991 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:42:39,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:42:39,992 INFO L85 PathProgramCache]: Analyzing trace with hash 1062375293, now seen corresponding path program 9 times [2021-11-02 22:42:39,992 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:42:39,992 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1876374655] [2021-11-02 22:42:39,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:42:39,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:42:40,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:42:40,245 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-02 22:42:40,245 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:42:40,245 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1876374655] [2021-11-02 22:42:40,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1876374655] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:40,246 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [299423477] [2021-11-02 22:42:40,246 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:42:40,246 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:40,246 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:42:40,247 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:42:40,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-02 22:42:41,709 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-02 22:42:41,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:42:41,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-02 22:42:41,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:42:41,949 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-02 22:42:41,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [299423477] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:41,949 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:42:41,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 10] total 24 [2021-11-02 22:42:41,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351405806] [2021-11-02 22:42:41,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-02 22:42:41,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:42:41,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-02 22:42:41,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=500, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:42:41,951 INFO L87 Difference]: Start difference. First operand 964 states and 1302 transitions. Second operand has 24 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:43,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:42:43,410 INFO L93 Difference]: Finished difference Result 1224 states and 1600 transitions. [2021-11-02 22:42:43,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-02 22:42:43,418 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-02 22:42:43,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:42:43,421 INFO L225 Difference]: With dead ends: 1224 [2021-11-02 22:42:43,422 INFO L226 Difference]: Without dead ends: 1036 [2021-11-02 22:42:43,423 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=172, Invalid=2278, Unknown=0, NotChecked=0, Total=2450 [2021-11-02 22:42:43,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1036 states. [2021-11-02 22:42:43,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1036 to 917. [2021-11-02 22:42:43,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 917 states, 916 states have (on average 1.3329694323144106) internal successors, (1221), 916 states have internal predecessors, (1221), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:43,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 917 states to 917 states and 1221 transitions. [2021-11-02 22:42:43,469 INFO L78 Accepts]: Start accepts. Automaton has 917 states and 1221 transitions. Word has length 39 [2021-11-02 22:42:43,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:42:43,470 INFO L470 AbstractCegarLoop]: Abstraction has 917 states and 1221 transitions. [2021-11-02 22:42:43,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:43,470 INFO L276 IsEmpty]: Start isEmpty. Operand 917 states and 1221 transitions. [2021-11-02 22:42:43,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-02 22:42:43,472 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:42:43,472 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:42:43,480 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2021-11-02 22:42:43,680 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:43,680 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:42:43,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:42:43,681 INFO L85 PathProgramCache]: Analyzing trace with hash 377237085, now seen corresponding path program 9 times [2021-11-02 22:42:43,681 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:42:43,681 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629806457] [2021-11-02 22:42:43,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:42:43,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:42:43,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:42:44,144 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:42:44,145 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:42:44,145 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629806457] [2021-11-02 22:42:44,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629806457] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:44,145 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1928102920] [2021-11-02 22:42:44,145 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:42:44,145 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:44,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:42:44,146 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:42:44,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-02 22:42:45,286 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-02 22:42:45,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:42:45,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-02 22:42:45,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:42:45,536 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:42:45,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1928102920] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:45,537 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:42:45,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 23 [2021-11-02 22:42:45,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378185415] [2021-11-02 22:42:45,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-02 22:42:45,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:42:45,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-02 22:42:45,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:42:45,539 INFO L87 Difference]: Start difference. First operand 917 states and 1221 transitions. Second operand has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 23 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:50,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:42:50,214 INFO L93 Difference]: Finished difference Result 1697 states and 2345 transitions. [2021-11-02 22:42:50,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2021-11-02 22:42:50,214 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 23 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-02 22:42:50,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:42:50,217 INFO L225 Difference]: With dead ends: 1697 [2021-11-02 22:42:50,217 INFO L226 Difference]: Without dead ends: 1554 [2021-11-02 22:42:50,219 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4851 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=450, Invalid=14312, Unknown=0, NotChecked=0, Total=14762 [2021-11-02 22:42:50,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1554 states. [2021-11-02 22:42:50,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1554 to 998. [2021-11-02 22:42:50,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 998 states, 997 states have (on average 1.3259779338014042) internal successors, (1322), 997 states have internal predecessors, (1322), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:50,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 998 states to 998 states and 1322 transitions. [2021-11-02 22:42:50,254 INFO L78 Accepts]: Start accepts. Automaton has 998 states and 1322 transitions. Word has length 39 [2021-11-02 22:42:50,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:42:50,255 INFO L470 AbstractCegarLoop]: Abstraction has 998 states and 1322 transitions. [2021-11-02 22:42:50,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 23 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:50,255 INFO L276 IsEmpty]: Start isEmpty. Operand 998 states and 1322 transitions. [2021-11-02 22:42:50,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-02 22:42:50,256 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:42:50,256 INFO L513 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:42:50,266 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-02 22:42:50,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:50,457 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:42:50,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:42:50,458 INFO L85 PathProgramCache]: Analyzing trace with hash 519636076, now seen corresponding path program 27 times [2021-11-02 22:42:50,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:42:50,458 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432605633] [2021-11-02 22:42:50,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:42:50,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:42:50,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:42:51,072 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:42:51,072 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:42:51,072 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432605633] [2021-11-02 22:42:51,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1432605633] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:51,072 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1081937188] [2021-11-02 22:42:51,072 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:42:51,073 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:51,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:42:51,073 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:42:51,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-02 22:42:53,693 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-02 22:42:53,693 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:42:53,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-02 22:42:53,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:42:53,952 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:42:53,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1081937188] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:53,952 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:42:53,952 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 31 [2021-11-02 22:42:53,952 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257281608] [2021-11-02 22:42:53,953 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-02 22:42:53,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:42:53,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-02 22:42:53,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2021-11-02 22:42:53,953 INFO L87 Difference]: Start difference. First operand 998 states and 1322 transitions. Second operand has 31 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 31 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:56,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:42:56,049 INFO L93 Difference]: Finished difference Result 1330 states and 1912 transitions. [2021-11-02 22:42:56,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-02 22:42:56,050 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 31 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-02 22:42:56,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:42:56,052 INFO L225 Difference]: With dead ends: 1330 [2021-11-02 22:42:56,052 INFO L226 Difference]: Without dead ends: 1274 [2021-11-02 22:42:56,053 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2021-11-02 22:42:56,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1274 states. [2021-11-02 22:42:56,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1274 to 1033. [2021-11-02 22:42:56,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1033 states, 1032 states have (on average 1.3284883720930232) internal successors, (1371), 1032 states have internal predecessors, (1371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:56,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1033 states to 1033 states and 1371 transitions. [2021-11-02 22:42:56,087 INFO L78 Accepts]: Start accepts. Automaton has 1033 states and 1371 transitions. Word has length 39 [2021-11-02 22:42:56,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:42:56,087 INFO L470 AbstractCegarLoop]: Abstraction has 1033 states and 1371 transitions. [2021-11-02 22:42:56,087 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 31 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:42:56,087 INFO L276 IsEmpty]: Start isEmpty. Operand 1033 states and 1371 transitions. [2021-11-02 22:42:56,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-02 22:42:56,088 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:42:56,089 INFO L513 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:42:56,095 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Ended with exit code 0 [2021-11-02 22:42:56,289 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:56,289 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:42:56,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:42:56,290 INFO L85 PathProgramCache]: Analyzing trace with hash 1382330023, now seen corresponding path program 28 times [2021-11-02 22:42:56,290 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:42:56,290 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1258374359] [2021-11-02 22:42:56,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:42:56,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:42:56,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:42:57,097 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:42:57,098 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:42:57,098 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1258374359] [2021-11-02 22:42:57,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1258374359] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:57,098 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [508031011] [2021-11-02 22:42:57,098 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:42:57,098 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:57,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:42:57,100 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:42:57,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-02 22:42:58,046 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:42:58,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:42:58,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-02 22:42:58,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:42:58,299 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:42:58,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [508031011] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:58,299 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:42:58,300 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 33 [2021-11-02 22:42:58,300 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433254559] [2021-11-02 22:42:58,300 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-02 22:42:58,300 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:42:58,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-02 22:42:58,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=992, Unknown=0, NotChecked=0, Total=1056 [2021-11-02 22:42:58,301 INFO L87 Difference]: Start difference. First operand 1033 states and 1371 transitions. Second operand has 33 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 33 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:43:00,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:43:00,503 INFO L93 Difference]: Finished difference Result 1373 states and 1977 transitions. [2021-11-02 22:43:00,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-02 22:43:00,504 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 33 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-02 22:43:00,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:43:00,506 INFO L225 Difference]: With dead ends: 1373 [2021-11-02 22:43:00,506 INFO L226 Difference]: Without dead ends: 1317 [2021-11-02 22:43:00,507 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=69, Invalid=1053, Unknown=0, NotChecked=0, Total=1122 [2021-11-02 22:43:00,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1317 states. [2021-11-02 22:43:00,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1317 to 1068. [2021-11-02 22:43:00,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1068 states, 1067 states have (on average 1.330834114339269) internal successors, (1420), 1067 states have internal predecessors, (1420), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:43:00,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1068 states to 1068 states and 1420 transitions. [2021-11-02 22:43:00,542 INFO L78 Accepts]: Start accepts. Automaton has 1068 states and 1420 transitions. Word has length 40 [2021-11-02 22:43:00,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:43:00,542 INFO L470 AbstractCegarLoop]: Abstraction has 1068 states and 1420 transitions. [2021-11-02 22:43:00,542 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 33 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:43:00,543 INFO L276 IsEmpty]: Start isEmpty. Operand 1068 states and 1420 transitions. [2021-11-02 22:43:00,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-02 22:43:00,544 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:43:00,544 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:43:00,570 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Ended with exit code 0 [2021-11-02 22:43:00,744 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-02 22:43:00,745 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:43:00,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:43:00,745 INFO L85 PathProgramCache]: Analyzing trace with hash 1770910093, now seen corresponding path program 10 times [2021-11-02 22:43:00,745 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:43:00,745 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278478708] [2021-11-02 22:43:00,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:43:00,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:43:00,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:01,228 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-02 22:43:01,229 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:43:01,229 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278478708] [2021-11-02 22:43:01,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [278478708] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:43:01,229 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [834826018] [2021-11-02 22:43:01,230 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:43:01,230 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:43:01,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:43:01,235 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:43:01,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-02 22:43:02,267 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:43:02,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:43:02,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-02 22:43:02,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:43:02,691 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 18 proven. 81 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-02 22:43:02,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [834826018] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:43:02,691 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:43:02,691 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 12] total 33 [2021-11-02 22:43:02,691 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699159048] [2021-11-02 22:43:02,691 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-02 22:43:02,692 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:43:02,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-02 22:43:02,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=984, Unknown=0, NotChecked=0, Total=1056 [2021-11-02 22:43:02,692 INFO L87 Difference]: Start difference. First operand 1068 states and 1420 transitions. Second operand has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 33 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:15,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:15,563 INFO L93 Difference]: Finished difference Result 2919 states and 3775 transitions. [2021-11-02 22:45:15,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 216 states. [2021-11-02 22:45:15,564 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 33 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-02 22:45:15,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:15,567 INFO L225 Difference]: With dead ends: 2919 [2021-11-02 22:45:15,567 INFO L226 Difference]: Without dead ends: 2759 [2021-11-02 22:45:15,571 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 232 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20237 ImplicationChecksByTransitivity, 108.8s TimeCoverageRelationStatistics Valid=4172, Invalid=50350, Unknown=0, NotChecked=0, Total=54522 [2021-11-02 22:45:15,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2759 states. [2021-11-02 22:45:15,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2759 to 1059. [2021-11-02 22:45:15,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1059 states, 1058 states have (on average 1.3251417769376181) internal successors, (1402), 1058 states have internal predecessors, (1402), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:15,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1059 states to 1059 states and 1402 transitions. [2021-11-02 22:45:15,627 INFO L78 Accepts]: Start accepts. Automaton has 1059 states and 1402 transitions. Word has length 41 [2021-11-02 22:45:15,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:15,627 INFO L470 AbstractCegarLoop]: Abstraction has 1059 states and 1402 transitions. [2021-11-02 22:45:15,628 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 33 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:15,628 INFO L276 IsEmpty]: Start isEmpty. Operand 1059 states and 1402 transitions. [2021-11-02 22:45:15,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-02 22:45:15,629 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:15,630 INFO L513 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:15,665 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2021-11-02 22:45:15,843 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-02 22:45:15,843 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:45:15,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:15,843 INFO L85 PathProgramCache]: Analyzing trace with hash -1938928692, now seen corresponding path program 29 times [2021-11-02 22:45:15,843 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:15,844 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395310508] [2021-11-02 22:45:15,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:15,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:15,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:16,526 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:16,526 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:16,526 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395310508] [2021-11-02 22:45:16,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395310508] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:16,526 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1928384945] [2021-11-02 22:45:16,526 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:45:16,526 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:16,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:16,527 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:16,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-02 22:45:20,280 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2021-11-02 22:45:20,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:20,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-02 22:45:20,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:20,516 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:20,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1928384945] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:20,517 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:20,517 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2021-11-02 22:45:20,517 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895506639] [2021-11-02 22:45:20,517 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-02 22:45:20,517 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:20,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-02 22:45:20,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=1056, Unknown=0, NotChecked=0, Total=1122 [2021-11-02 22:45:20,519 INFO L87 Difference]: Start difference. First operand 1059 states and 1402 transitions. Second operand has 34 states, 34 states have (on average 1.2647058823529411) internal successors, (43), 34 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:22,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:22,406 INFO L93 Difference]: Finished difference Result 1406 states and 2021 transitions. [2021-11-02 22:45:22,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-02 22:45:22,406 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.2647058823529411) internal successors, (43), 34 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-02 22:45:22,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:22,409 INFO L225 Difference]: With dead ends: 1406 [2021-11-02 22:45:22,409 INFO L226 Difference]: Without dead ends: 1350 [2021-11-02 22:45:22,410 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=71, Invalid=1119, Unknown=0, NotChecked=0, Total=1190 [2021-11-02 22:45:22,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1350 states. [2021-11-02 22:45:22,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1350 to 1094. [2021-11-02 22:45:22,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1094 states, 1093 states have (on average 1.3275388838060385) internal successors, (1451), 1093 states have internal predecessors, (1451), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:22,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1094 states to 1094 states and 1451 transitions. [2021-11-02 22:45:22,458 INFO L78 Accepts]: Start accepts. Automaton has 1094 states and 1451 transitions. Word has length 41 [2021-11-02 22:45:22,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:22,458 INFO L470 AbstractCegarLoop]: Abstraction has 1094 states and 1451 transitions. [2021-11-02 22:45:22,459 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.2647058823529411) internal successors, (43), 34 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:22,459 INFO L276 IsEmpty]: Start isEmpty. Operand 1094 states and 1451 transitions. [2021-11-02 22:45:22,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-02 22:45:22,460 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:22,461 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:22,468 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2021-11-02 22:45:22,667 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:22,667 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:45:22,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:22,667 INFO L85 PathProgramCache]: Analyzing trace with hash -2041166362, now seen corresponding path program 12 times [2021-11-02 22:45:22,667 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:22,668 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664687646] [2021-11-02 22:45:22,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:22,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:22,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:23,330 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 75 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:45:23,330 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:23,330 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664687646] [2021-11-02 22:45:23,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [664687646] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:23,330 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211039174] [2021-11-02 22:45:23,331 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:45:23,331 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:23,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:23,333 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:23,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-02 22:45:24,577 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-11-02 22:45:24,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:24,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 91 conjunts are in the unsatisfiable core [2021-11-02 22:45:24,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:25,640 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:25,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1211039174] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:25,641 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:25,641 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 31] total 39 [2021-11-02 22:45:25,641 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573643069] [2021-11-02 22:45:25,641 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-02 22:45:25,641 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:25,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-02 22:45:25,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1376, Unknown=0, NotChecked=0, Total=1482 [2021-11-02 22:45:25,642 INFO L87 Difference]: Start difference. First operand 1094 states and 1451 transitions. Second operand has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 39 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:27,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:27,311 INFO L93 Difference]: Finished difference Result 1110 states and 1466 transitions. [2021-11-02 22:45:27,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-02 22:45:27,312 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 39 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-02 22:45:27,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:27,314 INFO L225 Difference]: With dead ends: 1110 [2021-11-02 22:45:27,314 INFO L226 Difference]: Without dead ends: 1075 [2021-11-02 22:45:27,315 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 424 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=158, Invalid=2004, Unknown=0, NotChecked=0, Total=2162 [2021-11-02 22:45:27,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1075 states. [2021-11-02 22:45:27,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1075 to 1075. [2021-11-02 22:45:27,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1075 states, 1074 states have (on average 1.3324022346368716) internal successors, (1431), 1074 states have internal predecessors, (1431), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:27,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1075 states to 1075 states and 1431 transitions. [2021-11-02 22:45:27,362 INFO L78 Accepts]: Start accepts. Automaton has 1075 states and 1431 transitions. Word has length 42 [2021-11-02 22:45:27,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:27,362 INFO L470 AbstractCegarLoop]: Abstraction has 1075 states and 1431 transitions. [2021-11-02 22:45:27,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 39 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:27,362 INFO L276 IsEmpty]: Start isEmpty. Operand 1075 states and 1431 transitions. [2021-11-02 22:45:27,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-02 22:45:27,364 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:27,364 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:27,371 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:27,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:27,571 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:45:27,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:27,572 INFO L85 PathProgramCache]: Analyzing trace with hash 1591776935, now seen corresponding path program 13 times [2021-11-02 22:45:27,572 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:27,572 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1662592182] [2021-11-02 22:45:27,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:27,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:27,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:27,738 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2021-11-02 22:45:27,738 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:27,738 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1662592182] [2021-11-02 22:45:27,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1662592182] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:27,738 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [654058115] [2021-11-02 22:45:27,738 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:45:27,739 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:27,739 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:27,740 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:27,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-02 22:45:28,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:28,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-02 22:45:28,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:28,824 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 12 proven. 30 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-02 22:45:28,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [654058115] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:28,825 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:28,825 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 17 [2021-11-02 22:45:28,825 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265559710] [2021-11-02 22:45:28,825 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-02 22:45:28,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:28,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-02 22:45:28,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=189, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:45:28,826 INFO L87 Difference]: Start difference. First operand 1075 states and 1431 transitions. Second operand has 17 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 17 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:30,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:30,087 INFO L93 Difference]: Finished difference Result 3042 states and 4004 transitions. [2021-11-02 22:45:30,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-02 22:45:30,087 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 17 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-02 22:45:30,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:30,091 INFO L225 Difference]: With dead ends: 3042 [2021-11-02 22:45:30,092 INFO L226 Difference]: Without dead ends: 2727 [2021-11-02 22:45:30,093 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=338, Invalid=784, Unknown=0, NotChecked=0, Total=1122 [2021-11-02 22:45:30,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2727 states. [2021-11-02 22:45:30,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2727 to 1226. [2021-11-02 22:45:30,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1226 states, 1225 states have (on average 1.3444897959183673) internal successors, (1647), 1225 states have internal predecessors, (1647), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:30,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1226 states to 1226 states and 1647 transitions. [2021-11-02 22:45:30,158 INFO L78 Accepts]: Start accepts. Automaton has 1226 states and 1647 transitions. Word has length 42 [2021-11-02 22:45:30,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:30,158 INFO L470 AbstractCegarLoop]: Abstraction has 1226 states and 1647 transitions. [2021-11-02 22:45:30,158 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 17 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:30,158 INFO L276 IsEmpty]: Start isEmpty. Operand 1226 states and 1647 transitions. [2021-11-02 22:45:30,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-02 22:45:30,160 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:30,160 INFO L513 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:30,197 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2021-11-02 22:45:30,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable62 [2021-11-02 22:45:30,375 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:45:30,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:30,376 INFO L85 PathProgramCache]: Analyzing trace with hash -1818733753, now seen corresponding path program 30 times [2021-11-02 22:45:30,376 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:30,376 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1916605344] [2021-11-02 22:45:30,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:30,376 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:30,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:31,105 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:31,105 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:31,105 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1916605344] [2021-11-02 22:45:31,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1916605344] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:31,105 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1773675098] [2021-11-02 22:45:31,106 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:45:31,106 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:31,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:31,111 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:31,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-02 22:45:33,929 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2021-11-02 22:45:33,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:33,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-02 22:45:33,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:34,175 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:34,175 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1773675098] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:34,176 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:34,176 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34] total 35 [2021-11-02 22:45:34,176 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152560853] [2021-11-02 22:45:34,176 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-02 22:45:34,176 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:34,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-02 22:45:34,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=1122, Unknown=0, NotChecked=0, Total=1190 [2021-11-02 22:45:34,177 INFO L87 Difference]: Start difference. First operand 1226 states and 1647 transitions. Second operand has 35 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 35 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:36,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:36,274 INFO L93 Difference]: Finished difference Result 1698 states and 2508 transitions. [2021-11-02 22:45:36,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-02 22:45:36,275 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 35 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-02 22:45:36,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:36,278 INFO L225 Difference]: With dead ends: 1698 [2021-11-02 22:45:36,279 INFO L226 Difference]: Without dead ends: 1633 [2021-11-02 22:45:36,279 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=73, Invalid=1187, Unknown=0, NotChecked=0, Total=1260 [2021-11-02 22:45:36,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1633 states. [2021-11-02 22:45:36,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1633 to 1267. [2021-11-02 22:45:36,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1267 states, 1266 states have (on average 1.3467614533965244) internal successors, (1705), 1266 states have internal predecessors, (1705), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:36,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1267 states to 1267 states and 1705 transitions. [2021-11-02 22:45:36,343 INFO L78 Accepts]: Start accepts. Automaton has 1267 states and 1705 transitions. Word has length 42 [2021-11-02 22:45:36,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:36,344 INFO L470 AbstractCegarLoop]: Abstraction has 1267 states and 1705 transitions. [2021-11-02 22:45:36,344 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 35 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:36,344 INFO L276 IsEmpty]: Start isEmpty. Operand 1267 states and 1705 transitions. [2021-11-02 22:45:36,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-02 22:45:36,346 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:36,346 INFO L513 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:36,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:36,554 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:36,554 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:45:36,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:36,555 INFO L85 PathProgramCache]: Analyzing trace with hash 179807437, now seen corresponding path program 11 times [2021-11-02 22:45:36,555 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:36,555 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997146078] [2021-11-02 22:45:36,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:36,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:36,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:36,920 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-02 22:45:36,923 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:36,923 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1997146078] [2021-11-02 22:45:36,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1997146078] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:36,923 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1945458248] [2021-11-02 22:45:36,924 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:45:36,925 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:36,925 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:36,926 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:36,935 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-02 22:45:40,711 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-11-02 22:45:40,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:40,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 66 conjunts are in the unsatisfiable core [2021-11-02 22:45:40,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:41,183 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-02 22:45:41,184 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1945458248] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:41,184 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:41,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 35 [2021-11-02 22:45:41,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527430167] [2021-11-02 22:45:41,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-02 22:45:41,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:41,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-02 22:45:41,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1101, Unknown=0, NotChecked=0, Total=1190 [2021-11-02 22:45:41,186 INFO L87 Difference]: Start difference. First operand 1267 states and 1705 transitions. Second operand has 35 states, 35 states have (on average 1.3142857142857143) internal successors, (46), 35 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:45,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:45,339 INFO L93 Difference]: Finished difference Result 2130 states and 2967 transitions. [2021-11-02 22:45:45,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2021-11-02 22:45:45,340 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.3142857142857143) internal successors, (46), 35 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-02 22:45:45,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:45,341 INFO L225 Difference]: With dead ends: 2130 [2021-11-02 22:45:45,341 INFO L226 Difference]: Without dead ends: 1973 [2021-11-02 22:45:45,342 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6105 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=489, Invalid=17601, Unknown=0, NotChecked=0, Total=18090 [2021-11-02 22:45:45,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1973 states. [2021-11-02 22:45:45,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1973 to 1334. [2021-11-02 22:45:45,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1334 states, 1333 states have (on average 1.3465866466616654) internal successors, (1795), 1333 states have internal predecessors, (1795), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:45,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1334 states to 1334 states and 1795 transitions. [2021-11-02 22:45:45,388 INFO L78 Accepts]: Start accepts. Automaton has 1334 states and 1795 transitions. Word has length 43 [2021-11-02 22:45:45,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:45,388 INFO L470 AbstractCegarLoop]: Abstraction has 1334 states and 1795 transitions. [2021-11-02 22:45:45,389 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.3142857142857143) internal successors, (46), 35 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:45,389 INFO L276 IsEmpty]: Start isEmpty. Operand 1334 states and 1795 transitions. [2021-11-02 22:45:45,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-02 22:45:45,390 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:45,390 INFO L513 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:45,397 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:45,590 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:45,591 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:45:45,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:45,591 INFO L85 PathProgramCache]: Analyzing trace with hash 1907309356, now seen corresponding path program 31 times [2021-11-02 22:45:45,591 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:45,591 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [744891249] [2021-11-02 22:45:45,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:45,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:45,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:46,308 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:46,309 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:46,309 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [744891249] [2021-11-02 22:45:46,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [744891249] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:46,309 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [704427342] [2021-11-02 22:45:46,309 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:45:46,309 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:46,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:46,310 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:46,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-02 22:45:47,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:47,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-02 22:45:47,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:47,440 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:47,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [704427342] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:47,440 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:47,440 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2021-11-02 22:45:47,440 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51598025] [2021-11-02 22:45:47,441 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-02 22:45:47,441 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:47,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-02 22:45:47,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=1190, Unknown=0, NotChecked=0, Total=1260 [2021-11-02 22:45:47,441 INFO L87 Difference]: Start difference. First operand 1334 states and 1795 transitions. Second operand has 36 states, 36 states have (on average 1.25) internal successors, (45), 36 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:49,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:49,575 INFO L93 Difference]: Finished difference Result 1819 states and 2681 transitions. [2021-11-02 22:45:49,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-02 22:45:49,575 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.25) internal successors, (45), 36 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-02 22:45:49,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:49,577 INFO L225 Difference]: With dead ends: 1819 [2021-11-02 22:45:49,577 INFO L226 Difference]: Without dead ends: 1754 [2021-11-02 22:45:49,578 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=75, Invalid=1257, Unknown=0, NotChecked=0, Total=1332 [2021-11-02 22:45:49,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1754 states. [2021-11-02 22:45:49,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1754 to 1377. [2021-11-02 22:45:49,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1377 states, 1376 states have (on average 1.3488372093023255) internal successors, (1856), 1376 states have internal predecessors, (1856), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:49,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1377 states to 1377 states and 1856 transitions. [2021-11-02 22:45:49,641 INFO L78 Accepts]: Start accepts. Automaton has 1377 states and 1856 transitions. Word has length 43 [2021-11-02 22:45:49,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:49,642 INFO L470 AbstractCegarLoop]: Abstraction has 1377 states and 1856 transitions. [2021-11-02 22:45:49,642 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.25) internal successors, (45), 36 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:49,642 INFO L276 IsEmpty]: Start isEmpty. Operand 1377 states and 1856 transitions. [2021-11-02 22:45:49,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-02 22:45:49,644 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:49,644 INFO L513 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:49,686 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:49,867 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:49,867 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:45:49,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:49,867 INFO L85 PathProgramCache]: Analyzing trace with hash 1450528743, now seen corresponding path program 32 times [2021-11-02 22:45:49,868 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:49,868 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445271087] [2021-11-02 22:45:49,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:49,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:49,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:50,626 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:50,626 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:50,626 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445271087] [2021-11-02 22:45:50,626 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [445271087] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:50,626 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [957155951] [2021-11-02 22:45:50,626 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:45:50,626 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:50,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:50,627 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:50,628 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-02 22:45:51,546 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:45:51,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:51,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-02 22:45:51,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:51,798 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:51,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [957155951] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:51,798 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:51,798 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 37 [2021-11-02 22:45:51,798 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153365908] [2021-11-02 22:45:51,798 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-02 22:45:51,799 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:51,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-02 22:45:51,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=1260, Unknown=0, NotChecked=0, Total=1332 [2021-11-02 22:45:51,799 INFO L87 Difference]: Start difference. First operand 1377 states and 1856 transitions. Second operand has 37 states, 37 states have (on average 1.2432432432432432) internal successors, (46), 37 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:54,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:54,040 INFO L93 Difference]: Finished difference Result 1873 states and 2764 transitions. [2021-11-02 22:45:54,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-02 22:45:54,040 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.2432432432432432) internal successors, (46), 37 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-02 22:45:54,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:54,042 INFO L225 Difference]: With dead ends: 1873 [2021-11-02 22:45:54,042 INFO L226 Difference]: Without dead ends: 1808 [2021-11-02 22:45:54,042 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=77, Invalid=1329, Unknown=0, NotChecked=0, Total=1406 [2021-11-02 22:45:54,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1808 states. [2021-11-02 22:45:54,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1808 to 1420. [2021-11-02 22:45:54,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1420 states, 1419 states have (on average 1.3509513742071881) internal successors, (1917), 1419 states have internal predecessors, (1917), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:54,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1420 states to 1420 states and 1917 transitions. [2021-11-02 22:45:54,091 INFO L78 Accepts]: Start accepts. Automaton has 1420 states and 1917 transitions. Word has length 44 [2021-11-02 22:45:54,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:54,092 INFO L470 AbstractCegarLoop]: Abstraction has 1420 states and 1917 transitions. [2021-11-02 22:45:54,092 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.2432432432432432) internal successors, (46), 37 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:45:54,092 INFO L276 IsEmpty]: Start isEmpty. Operand 1420 states and 1917 transitions. [2021-11-02 22:45:54,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-02 22:45:54,093 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:54,093 INFO L513 BasicCegarLoop]: trace histogram [11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:54,116 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Ended with exit code 0 [2021-11-02 22:45:54,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-11-02 22:45:54,295 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:45:54,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:54,295 INFO L85 PathProgramCache]: Analyzing trace with hash 1991519901, now seen corresponding path program 12 times [2021-11-02 22:45:54,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:54,296 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126850424] [2021-11-02 22:45:54,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:54,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:54,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:54,816 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:54,816 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:54,816 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126850424] [2021-11-02 22:45:54,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2126850424] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:54,816 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [660553560] [2021-11-02 22:45:54,816 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:45:54,817 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:54,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:54,819 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:54,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-02 22:45:56,254 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-02 22:45:56,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:56,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-02 22:45:56,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:56,755 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2021-11-02 22:45:56,755 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [660553560] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:56,755 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:56,755 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 14] total 39 [2021-11-02 22:45:56,755 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173294313] [2021-11-02 22:45:56,756 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-02 22:45:56,756 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:56,756 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-02 22:45:56,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=1406, Unknown=0, NotChecked=0, Total=1482 [2021-11-02 22:45:56,757 INFO L87 Difference]: Start difference. First operand 1420 states and 1917 transitions. Second operand has 39 states, 39 states have (on average 1.6666666666666667) internal successors, (65), 39 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:46:06,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:46:06,574 INFO L93 Difference]: Finished difference Result 2836 states and 3870 transitions. [2021-11-02 22:46:06,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 185 states. [2021-11-02 22:46:06,574 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.6666666666666667) internal successors, (65), 39 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-02 22:46:06,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:46:06,576 INFO L225 Difference]: With dead ends: 2836 [2021-11-02 22:46:06,576 INFO L226 Difference]: Without dead ends: 2189 [2021-11-02 22:46:06,578 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12567 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=883, Invalid=38123, Unknown=0, NotChecked=0, Total=39006 [2021-11-02 22:46:06,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2189 states. [2021-11-02 22:46:06,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2189 to 1221. [2021-11-02 22:46:06,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1221 states, 1220 states have (on average 1.301639344262295) internal successors, (1588), 1220 states have internal predecessors, (1588), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:46:06,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1221 states to 1221 states and 1588 transitions. [2021-11-02 22:46:06,630 INFO L78 Accepts]: Start accepts. Automaton has 1221 states and 1588 transitions. Word has length 45 [2021-11-02 22:46:06,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:46:06,631 INFO L470 AbstractCegarLoop]: Abstraction has 1221 states and 1588 transitions. [2021-11-02 22:46:06,631 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.6666666666666667) internal successors, (65), 39 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:46:06,631 INFO L276 IsEmpty]: Start isEmpty. Operand 1221 states and 1588 transitions. [2021-11-02 22:46:06,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-02 22:46:06,632 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:46:06,632 INFO L513 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:46:06,638 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2021-11-02 22:46:06,835 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-11-02 22:46:06,835 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:46:06,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:46:06,835 INFO L85 PathProgramCache]: Analyzing trace with hash 175231628, now seen corresponding path program 33 times [2021-11-02 22:46:06,836 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:46:06,836 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927993605] [2021-11-02 22:46:06,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:46:06,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:46:06,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:07,659 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:46:07,659 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:46:07,659 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927993605] [2021-11-02 22:46:07,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1927993605] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:07,660 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [125519344] [2021-11-02 22:46:07,660 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:46:07,660 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:07,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:46:07,663 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:46:07,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-02 22:46:12,451 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-02 22:46:12,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:46:12,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-02 22:46:12,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:46:12,748 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:46:12,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [125519344] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:12,749 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:46:12,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 38 [2021-11-02 22:46:12,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555558942] [2021-11-02 22:46:12,749 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-02 22:46:12,749 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:46:12,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-02 22:46:12,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=1332, Unknown=0, NotChecked=0, Total=1406 [2021-11-02 22:46:12,750 INFO L87 Difference]: Start difference. First operand 1221 states and 1588 transitions. Second operand has 38 states, 38 states have (on average 1.236842105263158) internal successors, (47), 38 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:46:15,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:46:15,368 INFO L93 Difference]: Finished difference Result 1867 states and 2756 transitions. [2021-11-02 22:46:15,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-02 22:46:15,369 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.236842105263158) internal successors, (47), 38 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-02 22:46:15,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:46:15,370 INFO L225 Difference]: With dead ends: 1867 [2021-11-02 22:46:15,370 INFO L226 Difference]: Without dead ends: 1797 [2021-11-02 22:46:15,371 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=79, Invalid=1403, Unknown=0, NotChecked=0, Total=1482 [2021-11-02 22:46:15,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1797 states. [2021-11-02 22:46:15,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1797 to 1252. [2021-11-02 22:46:15,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1252 states, 1251 states have (on average 1.3053557154276578) internal successors, (1633), 1251 states have internal predecessors, (1633), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:46:15,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1252 states to 1252 states and 1633 transitions. [2021-11-02 22:46:15,438 INFO L78 Accepts]: Start accepts. Automaton has 1252 states and 1633 transitions. Word has length 45 [2021-11-02 22:46:15,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:46:15,439 INFO L470 AbstractCegarLoop]: Abstraction has 1252 states and 1633 transitions. [2021-11-02 22:46:15,439 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.236842105263158) internal successors, (47), 38 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:46:15,439 INFO L276 IsEmpty]: Start isEmpty. Operand 1252 states and 1633 transitions. [2021-11-02 22:46:15,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-02 22:46:15,442 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:46:15,442 INFO L513 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:46:15,455 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2021-11-02 22:46:15,651 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-11-02 22:46:15,652 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:46:15,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:46:15,652 INFO L85 PathProgramCache]: Analyzing trace with hash -704273273, now seen corresponding path program 34 times [2021-11-02 22:46:15,652 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:46:15,653 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197841097] [2021-11-02 22:46:15,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:46:15,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:46:15,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:16,416 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:46:16,417 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:46:16,417 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197841097] [2021-11-02 22:46:16,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1197841097] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:16,417 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033732981] [2021-11-02 22:46:16,417 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:46:16,417 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:16,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:46:16,419 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:46:16,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2021-11-02 22:46:17,422 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:46:17,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:46:17,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-02 22:46:17,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:46:17,683 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:46:17,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033732981] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:17,683 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:46:17,683 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 39 [2021-11-02 22:46:17,684 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904103336] [2021-11-02 22:46:17,684 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-02 22:46:17,684 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:46:17,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-02 22:46:17,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=1406, Unknown=0, NotChecked=0, Total=1482 [2021-11-02 22:46:17,685 INFO L87 Difference]: Start difference. First operand 1252 states and 1633 transitions. Second operand has 39 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:46:20,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:46:20,335 INFO L93 Difference]: Finished difference Result 1912 states and 2829 transitions. [2021-11-02 22:46:20,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-02 22:46:20,336 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-02 22:46:20,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:46:20,338 INFO L225 Difference]: With dead ends: 1912 [2021-11-02 22:46:20,338 INFO L226 Difference]: Without dead ends: 1842 [2021-11-02 22:46:20,339 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=81, Invalid=1479, Unknown=0, NotChecked=0, Total=1560 [2021-11-02 22:46:20,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1842 states. [2021-11-02 22:46:20,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1842 to 1283. [2021-11-02 22:46:20,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1283 states, 1282 states have (on average 1.3088923556942278) internal successors, (1678), 1282 states have internal predecessors, (1678), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:46:20,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1283 states to 1283 states and 1678 transitions. [2021-11-02 22:46:20,381 INFO L78 Accepts]: Start accepts. Automaton has 1283 states and 1678 transitions. Word has length 46 [2021-11-02 22:46:20,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:46:20,381 INFO L470 AbstractCegarLoop]: Abstraction has 1283 states and 1678 transitions. [2021-11-02 22:46:20,381 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:46:20,381 INFO L276 IsEmpty]: Start isEmpty. Operand 1283 states and 1678 transitions. [2021-11-02 22:46:20,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-02 22:46:20,383 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:46:20,383 INFO L513 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:46:20,426 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Forceful destruction successful, exit code 0 [2021-11-02 22:46:20,618 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2021-11-02 22:46:20,619 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:46:20,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:46:20,619 INFO L85 PathProgramCache]: Analyzing trace with hash 2095845868, now seen corresponding path program 35 times [2021-11-02 22:46:20,619 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:46:20,619 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2098004258] [2021-11-02 22:46:20,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:46:20,619 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:46:20,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:21,528 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:46:21,528 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:46:21,528 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2098004258] [2021-11-02 22:46:21,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2098004258] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:21,528 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [837601818] [2021-11-02 22:46:21,528 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:46:21,529 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:21,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:46:21,531 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:46:21,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-02 22:47:07,326 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2021-11-02 22:47:07,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:47:07,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 75 conjunts are in the unsatisfiable core [2021-11-02 22:47:07,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:47:07,652 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:47:07,652 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [837601818] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:47:07,652 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:47:07,653 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2021-11-02 22:47:07,653 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221497681] [2021-11-02 22:47:07,653 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-02 22:47:07,653 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:47:07,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-02 22:47:07,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=1482, Unknown=0, NotChecked=0, Total=1560 [2021-11-02 22:47:07,654 INFO L87 Difference]: Start difference. First operand 1283 states and 1678 transitions. Second operand has 40 states, 40 states have (on average 1.225) internal successors, (49), 40 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:47:10,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:47:10,395 INFO L93 Difference]: Finished difference Result 1957 states and 2902 transitions. [2021-11-02 22:47:10,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-02 22:47:10,396 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.225) internal successors, (49), 40 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-02 22:47:10,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:47:10,397 INFO L225 Difference]: With dead ends: 1957 [2021-11-02 22:47:10,398 INFO L226 Difference]: Without dead ends: 1887 [2021-11-02 22:47:10,398 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=83, Invalid=1557, Unknown=0, NotChecked=0, Total=1640 [2021-11-02 22:47:10,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1887 states. [2021-11-02 22:47:10,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1887 to 1314. [2021-11-02 22:47:10,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1314 states, 1313 states have (on average 1.3122619954303123) internal successors, (1723), 1313 states have internal predecessors, (1723), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:47:10,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1314 states to 1314 states and 1723 transitions. [2021-11-02 22:47:10,443 INFO L78 Accepts]: Start accepts. Automaton has 1314 states and 1723 transitions. Word has length 47 [2021-11-02 22:47:10,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:47:10,443 INFO L470 AbstractCegarLoop]: Abstraction has 1314 states and 1723 transitions. [2021-11-02 22:47:10,443 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.225) internal successors, (49), 40 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:47:10,444 INFO L276 IsEmpty]: Start isEmpty. Operand 1314 states and 1723 transitions. [2021-11-02 22:47:10,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-02 22:47:10,445 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:47:10,445 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:47:10,455 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2021-11-02 22:47:10,645 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:47:10,646 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:47:10,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:47:10,646 INFO L85 PathProgramCache]: Analyzing trace with hash 1867421639, now seen corresponding path program 14 times [2021-11-02 22:47:10,646 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:47:10,647 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2035718815] [2021-11-02 22:47:10,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:47:10,647 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:47:10,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:47:11,561 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-02 22:47:11,561 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:47:11,561 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2035718815] [2021-11-02 22:47:11,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2035718815] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:47:11,562 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1009189740] [2021-11-02 22:47:11,562 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:47:11,562 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:47:11,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:47:11,564 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:47:11,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-02 22:47:12,866 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:47:12,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:47:12,869 WARN L261 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 119 conjunts are in the unsatisfiable core [2021-11-02 22:47:12,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:47:14,293 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:47:14,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1009189740] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:47:14,293 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:47:14,294 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 36] total 45 [2021-11-02 22:47:14,294 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870031395] [2021-11-02 22:47:14,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-02 22:47:14,294 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:47:14,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-02 22:47:14,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1857, Unknown=0, NotChecked=0, Total=1980 [2021-11-02 22:47:14,295 INFO L87 Difference]: Start difference. First operand 1314 states and 1723 transitions. Second operand has 45 states, 45 states have (on average 1.8222222222222222) internal successors, (82), 45 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:47:15,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:47:15,593 INFO L93 Difference]: Finished difference Result 1325 states and 1733 transitions. [2021-11-02 22:47:15,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-02 22:47:15,593 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.8222222222222222) internal successors, (82), 45 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-02 22:47:15,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:47:15,595 INFO L225 Difference]: With dead ends: 1325 [2021-11-02 22:47:15,595 INFO L226 Difference]: Without dead ends: 1285 [2021-11-02 22:47:15,595 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 606 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=181, Invalid=2681, Unknown=0, NotChecked=0, Total=2862 [2021-11-02 22:47:15,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1285 states. [2021-11-02 22:47:15,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1285 to 1285. [2021-11-02 22:47:15,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1285 states, 1284 states have (on average 1.3185358255451713) internal successors, (1693), 1284 states have internal predecessors, (1693), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:47:15,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1285 states to 1285 states and 1693 transitions. [2021-11-02 22:47:15,637 INFO L78 Accepts]: Start accepts. Automaton has 1285 states and 1693 transitions. Word has length 48 [2021-11-02 22:47:15,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:47:15,637 INFO L470 AbstractCegarLoop]: Abstraction has 1285 states and 1693 transitions. [2021-11-02 22:47:15,637 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.8222222222222222) internal successors, (82), 45 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:47:15,637 INFO L276 IsEmpty]: Start isEmpty. Operand 1285 states and 1693 transitions. [2021-11-02 22:47:15,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-02 22:47:15,639 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:47:15,640 INFO L513 BasicCegarLoop]: trace histogram [12, 12, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:47:15,664 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Ended with exit code 0 [2021-11-02 22:47:15,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:47:15,840 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:47:15,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:47:15,841 INFO L85 PathProgramCache]: Analyzing trace with hash 1453117287, now seen corresponding path program 10 times [2021-11-02 22:47:15,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:47:15,841 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [539239246] [2021-11-02 22:47:15,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:47:15,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:47:15,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:47:16,167 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 0 proven. 88 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-11-02 22:47:16,167 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:47:16,167 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [539239246] [2021-11-02 22:47:16,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [539239246] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:47:16,167 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1830886242] [2021-11-02 22:47:16,168 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:47:16,168 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:47:16,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:47:16,169 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:47:16,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2021-11-02 22:47:17,256 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:47:17,256 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:47:17,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-02 22:47:17,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:47:17,421 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 0 proven. 88 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-11-02 22:47:17,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1830886242] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:47:17,422 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:47:17,422 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2021-11-02 22:47:17,422 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010393101] [2021-11-02 22:47:17,422 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-02 22:47:17,422 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:47:17,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-02 22:47:17,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=376, Unknown=0, NotChecked=0, Total=420 [2021-11-02 22:47:17,423 INFO L87 Difference]: Start difference. First operand 1285 states and 1693 transitions. Second operand has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:47:18,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:47:18,193 INFO L93 Difference]: Finished difference Result 1556 states and 1994 transitions. [2021-11-02 22:47:18,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-02 22:47:18,193 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-02 22:47:18,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:47:18,195 INFO L225 Difference]: With dead ends: 1556 [2021-11-02 22:47:18,195 INFO L226 Difference]: Without dead ends: 1528 [2021-11-02 22:47:18,195 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=119, Invalid=1141, Unknown=0, NotChecked=0, Total=1260 [2021-11-02 22:47:18,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1528 states. [2021-11-02 22:47:18,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1528 to 1285. [2021-11-02 22:47:18,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1285 states, 1284 states have (on average 1.3177570093457944) internal successors, (1692), 1284 states have internal predecessors, (1692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:47:18,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1285 states to 1285 states and 1692 transitions. [2021-11-02 22:47:18,237 INFO L78 Accepts]: Start accepts. Automaton has 1285 states and 1692 transitions. Word has length 48 [2021-11-02 22:47:18,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:47:18,237 INFO L470 AbstractCegarLoop]: Abstraction has 1285 states and 1692 transitions. [2021-11-02 22:47:18,237 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:47:18,237 INFO L276 IsEmpty]: Start isEmpty. Operand 1285 states and 1692 transitions. [2021-11-02 22:47:18,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-02 22:47:18,239 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:47:18,239 INFO L513 BasicCegarLoop]: trace histogram [12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:47:18,263 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Ended with exit code 0 [2021-11-02 22:47:18,442 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:47:18,443 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:47:18,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:47:18,443 INFO L85 PathProgramCache]: Analyzing trace with hash -174381209, now seen corresponding path program 13 times [2021-11-02 22:47:18,443 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:47:18,443 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128564310] [2021-11-02 22:47:18,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:47:18,443 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:47:18,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:47:18,996 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:47:18,996 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:47:18,996 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128564310] [2021-11-02 22:47:18,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1128564310] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:47:18,996 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [318565073] [2021-11-02 22:47:18,997 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:47:18,997 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:47:18,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:47:18,997 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:47:18,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6c6d46b3-5efc-4dca-bfdd-a2696c164d7a/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-02 22:47:20,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:47:20,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-02 22:47:20,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:47:20,668 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 12 proven. 144 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-02 22:47:20,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [318565073] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:47:20,669 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:47:20,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 15] total 42 [2021-11-02 22:47:20,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705165733] [2021-11-02 22:47:20,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-02 22:47:20,669 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:47:20,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-02 22:47:20,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=1640, Unknown=0, NotChecked=0, Total=1722 [2021-11-02 22:47:20,670 INFO L87 Difference]: Start difference. First operand 1285 states and 1692 transitions. Second operand has 42 states, 42 states have (on average 1.9047619047619047) internal successors, (80), 42 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)