./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/config/AutomizerReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF --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 5506d4c7458a400c41a33af3f6404f1e04b9f2e97e99f1fb53b74acf6bf59baf --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 07:19:36,734 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 07:19:36,736 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 07:19:36,787 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 07:19:36,788 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 07:19:36,789 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 07:19:36,791 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 07:19:36,793 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 07:19:36,795 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 07:19:36,797 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 07:19:36,798 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 07:19:36,799 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 07:19:36,800 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 07:19:36,801 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 07:19:36,803 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 07:19:36,805 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 07:19:36,806 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 07:19:36,807 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 07:19:36,810 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 07:19:36,813 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 07:19:36,815 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 07:19:36,816 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 07:19:36,818 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 07:19:36,819 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 07:19:36,823 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 07:19:36,823 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 07:19:36,824 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 07:19:36,825 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 07:19:36,826 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 07:19:36,827 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 07:19:36,828 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 07:19:36,829 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 07:19:36,830 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 07:19:36,831 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 07:19:36,832 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 07:19:36,833 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 07:19:36,833 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 07:19:36,834 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 07:19:36,834 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 07:19:36,836 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 07:19:36,837 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 07:19:36,838 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-20 07:19:36,864 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 07:19:36,864 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 07:19:36,864 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 07:19:36,865 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 07:19:36,865 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 07:19:36,865 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 07:19:36,866 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-20 07:19:36,866 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-20 07:19:36,867 INFO L138 SettingsManager]: * Use SBE=true [2021-11-20 07:19:36,867 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 07:19:36,867 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 07:19:36,867 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 07:19:36,868 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 07:19:36,868 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 07:19:36,868 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 07:19:36,868 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 07:19:36,868 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 07:19:36,869 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 07:19:36,869 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 07:19:36,873 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 07:19:36,874 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 07:19:36,874 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 07:19:36,874 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-20 07:19:36,874 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 07:19:36,875 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 07:19:36,875 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 07:19:36,875 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 07:19:36,875 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 07:19:36,876 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-20 07:19:36,876 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 07:19:36,877 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-20 07:19:36,877 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-20 07:19:36,877 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 07:19:36,877 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 07:19:36,878 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_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5506d4c7458a400c41a33af3f6404f1e04b9f2e97e99f1fb53b74acf6bf59baf [2021-11-20 07:19:37,147 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 07:19:37,185 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 07:19:37,188 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 07:19:37,189 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 07:19:37,190 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 07:19:37,191 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c [2021-11-20 07:19:37,256 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/data/aa9099986/1494f93277dc48e3aa09b617c8e91a7b/FLAG6b91c7b56 [2021-11-20 07:19:37,669 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 07:19:37,669 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c [2021-11-20 07:19:37,675 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/data/aa9099986/1494f93277dc48e3aa09b617c8e91a7b/FLAG6b91c7b56 [2021-11-20 07:19:38,074 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/data/aa9099986/1494f93277dc48e3aa09b617c8e91a7b [2021-11-20 07:19:38,076 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 07:19:38,078 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 07:19:38,094 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 07:19:38,094 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 07:19:38,097 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 07:19:38,098 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 07:19:38" (1/1) ... [2021-11-20 07:19:38,099 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@a105d01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:19:38, skipping insertion in model container [2021-11-20 07:19:38,099 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 07:19:38" (1/1) ... [2021-11-20 07:19:38,107 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 07:19:38,130 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 07:19:38,386 WARN L230 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_99e48714-7662-421f-8846-0e3b85e64002/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c[526,539] [2021-11-20 07:19:38,404 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 07:19:38,414 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 07:19:38,429 WARN L230 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_99e48714-7662-421f-8846-0e3b85e64002/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound50.c[526,539] [2021-11-20 07:19:38,437 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 07:19:38,452 INFO L208 MainTranslator]: Completed translation [2021-11-20 07:19:38,452 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:19:38 WrapperNode [2021-11-20 07:19:38,452 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 07:19:38,454 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 07:19:38,454 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 07:19:38,454 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 07:19:38,462 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:19:38" (1/1) ... [2021-11-20 07:19:38,470 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:19:38" (1/1) ... [2021-11-20 07:19:38,491 INFO L137 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 61 [2021-11-20 07:19:38,492 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 07:19:38,492 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 07:19:38,493 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 07:19:38,493 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 07:19:38,502 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:19:38" (1/1) ... [2021-11-20 07:19:38,502 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:19:38" (1/1) ... [2021-11-20 07:19:38,504 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:19:38" (1/1) ... [2021-11-20 07:19:38,504 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:19:38" (1/1) ... [2021-11-20 07:19:38,508 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:19:38" (1/1) ... [2021-11-20 07:19:38,513 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:19:38" (1/1) ... [2021-11-20 07:19:38,514 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:19:38" (1/1) ... [2021-11-20 07:19:38,516 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 07:19:38,517 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 07:19:38,517 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 07:19:38,517 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 07:19:38,518 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:19:38" (1/1) ... [2021-11-20 07:19:38,527 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 07:19:38,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:19:38,568 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 07:19:38,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 07:19:38,633 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 07:19:38,634 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 07:19:38,634 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 07:19:38,634 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 07:19:38,634 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-20 07:19:38,634 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-20 07:19:38,718 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 07:19:38,721 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 07:19:38,920 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 07:19:38,931 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 07:19:38,935 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-20 07:19:38,938 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 07:19:38 BoogieIcfgContainer [2021-11-20 07:19:38,938 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 07:19:38,944 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 07:19:38,944 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 07:19:38,948 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 07:19:38,948 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 07:19:38" (1/3) ... [2021-11-20 07:19:38,950 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1292a2fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 07:19:38, skipping insertion in model container [2021-11-20 07:19:38,950 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:19:38" (2/3) ... [2021-11-20 07:19:38,951 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1292a2fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 07:19:38, skipping insertion in model container [2021-11-20 07:19:38,951 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 07:19:38" (3/3) ... [2021-11-20 07:19:38,953 INFO L111 eAbstractionObserver]: Analyzing ICFG hard2_unwindbound50.c [2021-11-20 07:19:38,963 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 07:19:38,964 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 07:19:39,033 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 07:19:39,041 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 [2021-11-20 07:19:39,041 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 07:19:39,065 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 16 states have (on average 1.5625) internal successors, (25), 17 states have internal predecessors, (25), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-20 07:19:39,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-20 07:19:39,071 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:19:39,072 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:19:39,072 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:19:39,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:19:39,077 INFO L85 PathProgramCache]: Analyzing trace with hash 643118537, now seen corresponding path program 1 times [2021-11-20 07:19:39,088 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:19:39,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716759294] [2021-11-20 07:19:39,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:39,090 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:19:39,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:19:39,240 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:19:39,240 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:19:39,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1716759294] [2021-11-20 07:19:39,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1716759294] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 07:19:39,242 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 07:19:39,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 07:19:39,244 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309297187] [2021-11-20 07:19:39,245 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 07:19:39,250 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-20 07:19:39,251 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:19:39,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-20 07:19:39,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-20 07:19:39,287 INFO L87 Difference]: Start difference. First operand has 26 states, 16 states have (on average 1.5625) internal successors, (25), 17 states have internal predecessors, (25), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 07:19:39,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:19:39,315 INFO L93 Difference]: Finished difference Result 50 states and 83 transitions. [2021-11-20 07:19:39,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-20 07:19:39,317 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-20 07:19:39,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:19:39,328 INFO L225 Difference]: With dead ends: 50 [2021-11-20 07:19:39,328 INFO L226 Difference]: Without dead ends: 22 [2021-11-20 07:19:39,333 INFO L932 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 [2021-11-20 07:19:39,338 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 07:19:39,339 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 07:19:39,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-20 07:19:39,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-20 07:19:39,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-20 07:19:39,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 32 transitions. [2021-11-20 07:19:39,421 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 32 transitions. Word has length 8 [2021-11-20 07:19:39,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:19:39,422 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 32 transitions. [2021-11-20 07:19:39,422 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 07:19:39,423 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 32 transitions. [2021-11-20 07:19:39,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-20 07:19:39,424 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:19:39,424 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:19:39,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 07:19:39,425 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:19:39,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:19:39,427 INFO L85 PathProgramCache]: Analyzing trace with hash 181060127, now seen corresponding path program 1 times [2021-11-20 07:19:39,427 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:19:39,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368039926] [2021-11-20 07:19:39,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:39,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:19:39,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:19:39,552 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:19:39,552 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:19:39,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368039926] [2021-11-20 07:19:39,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1368039926] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 07:19:39,554 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 07:19:39,554 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 07:19:39,554 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1717534092] [2021-11-20 07:19:39,555 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 07:19:39,556 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 07:19:39,556 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:19:39,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 07:19:39,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 07:19:39,574 INFO L87 Difference]: Start difference. First operand 22 states and 32 transitions. Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 07:19:39,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:19:39,665 INFO L93 Difference]: Finished difference Result 36 states and 51 transitions. [2021-11-20 07:19:39,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 07:19:39,666 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-20 07:19:39,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:19:39,667 INFO L225 Difference]: With dead ends: 36 [2021-11-20 07:19:39,668 INFO L226 Difference]: Without dead ends: 34 [2021-11-20 07:19:39,669 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-20 07:19:39,672 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 15 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 07:19:39,675 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 105 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 07:19:39,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-20 07:19:39,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26. [2021-11-20 07:19:39,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-20 07:19:39,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 35 transitions. [2021-11-20 07:19:39,698 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 35 transitions. Word has length 8 [2021-11-20 07:19:39,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:19:39,700 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 35 transitions. [2021-11-20 07:19:39,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 07:19:39,701 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 35 transitions. [2021-11-20 07:19:39,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-20 07:19:39,707 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:19:39,708 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:19:39,708 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 07:19:39,709 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:19:39,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:19:39,711 INFO L85 PathProgramCache]: Analyzing trace with hash -712280900, now seen corresponding path program 1 times [2021-11-20 07:19:39,712 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:19:39,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873426856] [2021-11-20 07:19:39,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:39,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:19:39,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:19:39,807 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:19:39,807 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:19:39,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1873426856] [2021-11-20 07:19:39,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1873426856] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 07:19:39,810 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 07:19:39,810 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 07:19:39,811 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696721047] [2021-11-20 07:19:39,811 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 07:19:39,812 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 07:19:39,813 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:19:39,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 07:19:39,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 07:19:39,815 INFO L87 Difference]: Start difference. First operand 26 states and 35 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 07:19:39,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:19:39,850 INFO L93 Difference]: Finished difference Result 42 states and 57 transitions. [2021-11-20 07:19:39,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 07:19:39,851 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-20 07:19:39,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:19:39,854 INFO L225 Difference]: With dead ends: 42 [2021-11-20 07:19:39,855 INFO L226 Difference]: Without dead ends: 28 [2021-11-20 07:19:39,855 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 07:19:39,858 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 0 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 07:19:39,859 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 85 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 07:19:39,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-20 07:19:39,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-20 07:19:39,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-20 07:19:39,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2021-11-20 07:19:39,870 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 10 [2021-11-20 07:19:39,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:19:39,870 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2021-11-20 07:19:39,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 07:19:39,871 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2021-11-20 07:19:39,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-20 07:19:39,872 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:19:39,872 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:19:39,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-20 07:19:39,873 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:19:39,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:19:39,874 INFO L85 PathProgramCache]: Analyzing trace with hash 2036073049, now seen corresponding path program 1 times [2021-11-20 07:19:39,874 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:19:39,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54223053] [2021-11-20 07:19:39,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:39,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:19:39,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:19:39,939 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-11-20 07:19:39,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:19:39,949 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:19:39,949 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:19:39,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54223053] [2021-11-20 07:19:39,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [54223053] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 07:19:39,950 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 07:19:39,950 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 07:19:39,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491400139] [2021-11-20 07:19:39,951 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 07:19:39,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 07:19:39,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:19:39,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 07:19:39,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 07:19:39,953 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-20 07:19:40,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:19:40,025 INFO L93 Difference]: Finished difference Result 42 states and 56 transitions. [2021-11-20 07:19:40,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 07:19:40,026 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-11-20 07:19:40,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:19:40,028 INFO L225 Difference]: With dead ends: 42 [2021-11-20 07:19:40,028 INFO L226 Difference]: Without dead ends: 40 [2021-11-20 07:19:40,029 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-20 07:19:40,031 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 13 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 07:19:40,032 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 101 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 07:19:40,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-20 07:19:40,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2021-11-20 07:19:40,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 22 states have internal predecessors, (27), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-20 07:19:40,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2021-11-20 07:19:40,053 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 13 [2021-11-20 07:19:40,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:19:40,054 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2021-11-20 07:19:40,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-20 07:19:40,054 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2021-11-20 07:19:40,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-20 07:19:40,055 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:19:40,055 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:19:40,056 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-20 07:19:40,056 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:19:40,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:19:40,057 INFO L85 PathProgramCache]: Analyzing trace with hash 380169759, now seen corresponding path program 1 times [2021-11-20 07:19:40,057 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:19:40,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658727080] [2021-11-20 07:19:40,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:40,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:19:40,073 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 07:19:40,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [749344683] [2021-11-20 07:19:40,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:40,074 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:19:40,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:19:40,077 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:19:40,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 07:19:40,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:19:40,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-20 07:19:40,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:19:40,490 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 07:19:40,490 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 07:19:40,491 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:19:40,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658727080] [2021-11-20 07:19:40,493 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 07:19:40,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [749344683] [2021-11-20 07:19:40,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [749344683] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 07:19:40,494 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 07:19:40,495 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 07:19:40,495 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976956668] [2021-11-20 07:19:40,495 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 07:19:40,496 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 07:19:40,497 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:19:40,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 07:19:40,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 07:19:40,503 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-20 07:19:40,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:19:40,635 INFO L93 Difference]: Finished difference Result 61 states and 83 transitions. [2021-11-20 07:19:40,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 07:19:40,636 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-11-20 07:19:40,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:19:40,638 INFO L225 Difference]: With dead ends: 61 [2021-11-20 07:19:40,638 INFO L226 Difference]: Without dead ends: 46 [2021-11-20 07:19:40,640 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-20 07:19:40,643 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 10 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 07:19:40,646 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 115 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 07:19:40,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-20 07:19:40,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-11-20 07:19:40,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 30 states have internal predecessors, (36), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-20 07:19:40,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 60 transitions. [2021-11-20 07:19:40,675 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 60 transitions. Word has length 18 [2021-11-20 07:19:40,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:19:40,676 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 60 transitions. [2021-11-20 07:19:40,676 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-20 07:19:40,677 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 60 transitions. [2021-11-20 07:19:40,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-20 07:19:40,679 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:19:40,680 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:19:40,730 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 07:19:40,893 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:19:40,894 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:19:40,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:19:40,895 INFO L85 PathProgramCache]: Analyzing trace with hash -461064832, now seen corresponding path program 1 times [2021-11-20 07:19:40,895 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:19:40,895 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368132345] [2021-11-20 07:19:40,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:40,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:19:40,912 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 07:19:40,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [600539800] [2021-11-20 07:19:40,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:40,913 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:19:40,913 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:19:40,914 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:19:40,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 07:19:40,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:19:40,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-20 07:19:40,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:19:41,189 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 07:19:41,189 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 07:19:41,190 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:19:41,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [368132345] [2021-11-20 07:19:41,191 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 07:19:41,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [600539800] [2021-11-20 07:19:41,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [600539800] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 07:19:41,196 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 07:19:41,196 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 07:19:41,197 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542785746] [2021-11-20 07:19:41,197 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 07:19:41,197 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 07:19:41,198 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:19:41,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 07:19:41,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 07:19:41,199 INFO L87 Difference]: Start difference. First operand 46 states and 60 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-20 07:19:41,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:19:41,284 INFO L93 Difference]: Finished difference Result 60 states and 79 transitions. [2021-11-20 07:19:41,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 07:19:41,285 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 26 [2021-11-20 07:19:41,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:19:41,291 INFO L225 Difference]: With dead ends: 60 [2021-11-20 07:19:41,292 INFO L226 Difference]: Without dead ends: 52 [2021-11-20 07:19:41,293 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-20 07:19:41,298 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 11 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 07:19:41,299 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 87 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 07:19:41,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-20 07:19:41,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2021-11-20 07:19:41,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 32 states have (on average 1.28125) internal successors, (41), 34 states have internal predecessors, (41), 13 states have call successors, (13), 5 states have call predecessors, (13), 5 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-20 07:19:41,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 66 transitions. [2021-11-20 07:19:41,329 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 66 transitions. Word has length 26 [2021-11-20 07:19:41,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:19:41,331 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 66 transitions. [2021-11-20 07:19:41,331 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-20 07:19:41,331 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 66 transitions. [2021-11-20 07:19:41,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-20 07:19:41,333 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:19:41,334 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:19:41,377 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 07:19:41,549 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:19:41,550 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:19:41,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:19:41,550 INFO L85 PathProgramCache]: Analyzing trace with hash -909290541, now seen corresponding path program 1 times [2021-11-20 07:19:41,551 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:19:41,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1921845156] [2021-11-20 07:19:41,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:41,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:19:41,564 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 07:19:41,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1737669015] [2021-11-20 07:19:41,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:41,573 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:19:41,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:19:41,575 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:19:41,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 07:19:41,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:19:41,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-20 07:19:41,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:19:41,766 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-20 07:19:41,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:19:41,904 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-20 07:19:41,905 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:19:41,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1921845156] [2021-11-20 07:19:41,906 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 07:19:41,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1737669015] [2021-11-20 07:19:41,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1737669015] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 07:19:41,906 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 07:19:41,907 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2021-11-20 07:19:41,908 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530279293] [2021-11-20 07:19:41,908 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 07:19:41,910 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 07:19:41,910 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:19:41,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 07:19:41,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-11-20 07:19:41,912 INFO L87 Difference]: Start difference. First operand 51 states and 66 transitions. Second operand has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-20 07:19:42,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:19:42,071 INFO L93 Difference]: Finished difference Result 140 states and 173 transitions. [2021-11-20 07:19:42,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-20 07:19:42,071 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 33 [2021-11-20 07:19:42,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:19:42,077 INFO L225 Difference]: With dead ends: 140 [2021-11-20 07:19:42,077 INFO L226 Difference]: Without dead ends: 115 [2021-11-20 07:19:42,081 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-20 07:19:42,082 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 50 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 07:19:42,083 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 153 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 07:19:42,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-20 07:19:42,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 108. [2021-11-20 07:19:42,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 70 states have (on average 1.2142857142857142) internal successors, (85), 73 states have internal predecessors, (85), 23 states have call successors, (23), 14 states have call predecessors, (23), 14 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-20 07:19:42,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 129 transitions. [2021-11-20 07:19:42,113 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 129 transitions. Word has length 33 [2021-11-20 07:19:42,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:19:42,114 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 129 transitions. [2021-11-20 07:19:42,114 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-20 07:19:42,115 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 129 transitions. [2021-11-20 07:19:42,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-20 07:19:42,116 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:19:42,117 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-20 07:19:42,160 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 07:19:42,341 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:19:42,342 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:19:42,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:19:42,343 INFO L85 PathProgramCache]: Analyzing trace with hash 252591112, now seen corresponding path program 1 times [2021-11-20 07:19:42,343 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:19:42,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1458115522] [2021-11-20 07:19:42,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:42,343 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:19:42,357 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 07:19:42,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [862935855] [2021-11-20 07:19:42,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:42,358 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:19:42,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:19:42,366 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:19:42,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 07:19:42,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:19:42,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-20 07:19:42,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:19:42,662 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-20 07:19:42,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:19:42,820 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-20 07:19:42,822 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:19:42,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1458115522] [2021-11-20 07:19:42,822 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 07:19:42,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [862935855] [2021-11-20 07:19:42,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [862935855] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-20 07:19:42,823 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 07:19:42,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-11-20 07:19:42,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468028751] [2021-11-20 07:19:42,824 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 07:19:42,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 07:19:42,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:19:42,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 07:19:42,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-20 07:19:42,826 INFO L87 Difference]: Start difference. First operand 108 states and 129 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-20 07:19:43,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:19:43,052 INFO L93 Difference]: Finished difference Result 125 states and 150 transitions. [2021-11-20 07:19:43,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 07:19:43,053 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 36 [2021-11-20 07:19:43,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:19:43,055 INFO L225 Difference]: With dead ends: 125 [2021-11-20 07:19:43,055 INFO L226 Difference]: Without dead ends: 121 [2021-11-20 07:19:43,055 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-20 07:19:43,056 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 11 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 07:19:43,057 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 97 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 07:19:43,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-11-20 07:19:43,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 118. [2021-11-20 07:19:43,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 77 states have (on average 1.1818181818181819) internal successors, (91), 80 states have internal predecessors, (91), 25 states have call successors, (25), 16 states have call predecessors, (25), 15 states have return successors, (23), 21 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-20 07:19:43,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 139 transitions. [2021-11-20 07:19:43,078 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 139 transitions. Word has length 36 [2021-11-20 07:19:43,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:19:43,079 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 139 transitions. [2021-11-20 07:19:43,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-20 07:19:43,079 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 139 transitions. [2021-11-20 07:19:43,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-20 07:19:43,081 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:19:43,081 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:19:43,118 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-20 07:19:43,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-20 07:19:43,302 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:19:43,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:19:43,303 INFO L85 PathProgramCache]: Analyzing trace with hash 1605675221, now seen corresponding path program 1 times [2021-11-20 07:19:43,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:19:43,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1259375129] [2021-11-20 07:19:43,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:43,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:19:43,319 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 07:19:43,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2047308951] [2021-11-20 07:19:43,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:43,320 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:19:43,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:19:43,322 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:19:43,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 07:19:43,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:19:43,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-20 07:19:43,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:19:43,551 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 36 proven. 42 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-20 07:19:43,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:19:43,747 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-20 07:19:43,747 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:19:43,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1259375129] [2021-11-20 07:19:43,747 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 07:19:43,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2047308951] [2021-11-20 07:19:43,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2047308951] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 07:19:43,748 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 07:19:43,748 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2021-11-20 07:19:43,748 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893815455] [2021-11-20 07:19:43,749 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 07:19:43,752 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-20 07:19:43,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:19:43,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-20 07:19:43,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-11-20 07:19:43,753 INFO L87 Difference]: Start difference. First operand 118 states and 139 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-11-20 07:19:43,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:19:43,964 INFO L93 Difference]: Finished difference Result 241 states and 294 transitions. [2021-11-20 07:19:43,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 07:19:43,965 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 49 [2021-11-20 07:19:43,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:19:43,968 INFO L225 Difference]: With dead ends: 241 [2021-11-20 07:19:43,968 INFO L226 Difference]: Without dead ends: 220 [2021-11-20 07:19:43,968 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2021-11-20 07:19:43,969 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 80 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 07:19:43,969 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 268 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 07:19:43,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-11-20 07:19:43,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 213. [2021-11-20 07:19:43,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 138 states have (on average 1.1956521739130435) internal successors, (165), 147 states have internal predecessors, (165), 49 states have call successors, (49), 26 states have call predecessors, (49), 25 states have return successors, (45), 39 states have call predecessors, (45), 45 states have call successors, (45) [2021-11-20 07:19:43,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 259 transitions. [2021-11-20 07:19:43,995 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 259 transitions. Word has length 49 [2021-11-20 07:19:43,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:19:43,995 INFO L470 AbstractCegarLoop]: Abstraction has 213 states and 259 transitions. [2021-11-20 07:19:43,995 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-11-20 07:19:43,996 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 259 transitions. [2021-11-20 07:19:43,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-20 07:19:43,998 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:19:43,998 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:19:44,025 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-20 07:19:44,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:19:44,211 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:19:44,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:19:44,212 INFO L85 PathProgramCache]: Analyzing trace with hash -1800695307, now seen corresponding path program 1 times [2021-11-20 07:19:44,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:19:44,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118635676] [2021-11-20 07:19:44,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:44,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:19:44,221 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 07:19:44,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1474501872] [2021-11-20 07:19:44,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:44,222 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:19:44,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:19:44,228 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:19:44,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 07:19:44,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:19:44,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-20 07:19:44,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:19:44,892 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-20 07:19:44,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:19:46,673 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-20 07:19:46,674 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:19:46,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118635676] [2021-11-20 07:19:46,674 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 07:19:46,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474501872] [2021-11-20 07:19:46,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474501872] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 07:19:46,674 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 07:19:46,675 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-11-20 07:19:46,675 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396948296] [2021-11-20 07:19:46,675 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 07:19:46,676 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-20 07:19:46,676 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:19:46,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-20 07:19:46,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-20 07:19:46,677 INFO L87 Difference]: Start difference. First operand 213 states and 259 transitions. Second operand has 10 states, 10 states have (on average 3.3) internal successors, (33), 9 states have internal predecessors, (33), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-20 07:19:50,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:19:50,320 INFO L93 Difference]: Finished difference Result 367 states and 475 transitions. [2021-11-20 07:19:50,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-20 07:19:50,321 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 9 states have internal predecessors, (33), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 58 [2021-11-20 07:19:50,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:19:50,324 INFO L225 Difference]: With dead ends: 367 [2021-11-20 07:19:50,324 INFO L226 Difference]: Without dead ends: 299 [2021-11-20 07:19:50,326 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2021-11-20 07:19:50,326 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 50 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 07:19:50,327 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 241 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 07:19:50,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-11-20 07:19:50,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 270. [2021-11-20 07:19:50,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 184 states have (on average 1.233695652173913) internal successors, (227), 190 states have internal predecessors, (227), 56 states have call successors, (56), 29 states have call predecessors, (56), 29 states have return successors, (54), 50 states have call predecessors, (54), 54 states have call successors, (54) [2021-11-20 07:19:50,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 337 transitions. [2021-11-20 07:19:50,398 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 337 transitions. Word has length 58 [2021-11-20 07:19:50,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:19:50,400 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 337 transitions. [2021-11-20 07:19:50,400 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 9 states have internal predecessors, (33), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-20 07:19:50,400 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 337 transitions. [2021-11-20 07:19:50,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-20 07:19:50,410 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:19:50,410 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:19:50,452 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 07:19:50,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:19:50,626 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:19:50,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:19:50,626 INFO L85 PathProgramCache]: Analyzing trace with hash -1688778742, now seen corresponding path program 1 times [2021-11-20 07:19:50,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:19:50,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877766627] [2021-11-20 07:19:50,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:50,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:19:50,642 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 07:19:50,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1842988635] [2021-11-20 07:19:50,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:50,643 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:19:50,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:19:50,644 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:19:50,677 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 07:19:50,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:19:50,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-20 07:19:50,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:19:51,514 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 66 proven. 13 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2021-11-20 07:19:51,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:19:51,883 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 68 proven. 2 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2021-11-20 07:19:51,883 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:19:51,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877766627] [2021-11-20 07:19:51,884 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 07:19:51,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842988635] [2021-11-20 07:19:51,884 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842988635] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 07:19:51,884 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 07:19:51,884 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9] total 16 [2021-11-20 07:19:51,887 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634933526] [2021-11-20 07:19:51,887 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 07:19:51,889 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-20 07:19:51,889 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:19:51,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-20 07:19:51,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-11-20 07:19:51,890 INFO L87 Difference]: Start difference. First operand 270 states and 337 transitions. Second operand has 16 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 8 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 7 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-20 07:19:52,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:19:52,410 INFO L93 Difference]: Finished difference Result 331 states and 412 transitions. [2021-11-20 07:19:52,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 07:19:52,411 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 8 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 7 states have call predecessors, (17), 6 states have call successors, (17) Word has length 69 [2021-11-20 07:19:52,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:19:52,418 INFO L225 Difference]: With dead ends: 331 [2021-11-20 07:19:52,418 INFO L226 Difference]: Without dead ends: 235 [2021-11-20 07:19:52,419 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 121 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2021-11-20 07:19:52,420 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 50 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 406 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 260 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 406 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 07:19:52,420 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 260 Invalid, 453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 406 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 07:19:52,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2021-11-20 07:19:52,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 219. [2021-11-20 07:19:52,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 149 states have (on average 1.1946308724832215) internal successors, (178), 153 states have internal predecessors, (178), 43 states have call successors, (43), 27 states have call predecessors, (43), 26 states have return successors, (41), 38 states have call predecessors, (41), 41 states have call successors, (41) [2021-11-20 07:19:52,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 262 transitions. [2021-11-20 07:19:52,465 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 262 transitions. Word has length 69 [2021-11-20 07:19:52,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:19:52,466 INFO L470 AbstractCegarLoop]: Abstraction has 219 states and 262 transitions. [2021-11-20 07:19:52,466 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 8 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 7 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-20 07:19:52,466 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 262 transitions. [2021-11-20 07:19:52,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-20 07:19:52,470 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:19:52,470 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:19:52,513 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 07:19:52,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-20 07:19:52,688 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:19:52,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:19:52,689 INFO L85 PathProgramCache]: Analyzing trace with hash -1687889621, now seen corresponding path program 1 times [2021-11-20 07:19:52,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:19:52,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1842207508] [2021-11-20 07:19:52,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:52,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:19:52,701 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 07:19:52,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1764402672] [2021-11-20 07:19:52,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:52,705 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:19:52,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:19:52,706 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:19:52,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 07:19:52,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:19:52,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 07:19:52,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:19:53,018 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 84 proven. 0 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-11-20 07:19:53,019 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 07:19:53,019 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:19:53,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1842207508] [2021-11-20 07:19:53,019 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 07:19:53,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764402672] [2021-11-20 07:19:53,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1764402672] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 07:19:53,022 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 07:19:53,022 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 07:19:53,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134239056] [2021-11-20 07:19:53,023 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 07:19:53,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 07:19:53,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:19:53,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 07:19:53,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-20 07:19:53,024 INFO L87 Difference]: Start difference. First operand 219 states and 262 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-20 07:19:53,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:19:53,098 INFO L93 Difference]: Finished difference Result 238 states and 285 transitions. [2021-11-20 07:19:53,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 07:19:53,098 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 78 [2021-11-20 07:19:53,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:19:53,101 INFO L225 Difference]: With dead ends: 238 [2021-11-20 07:19:53,101 INFO L226 Difference]: Without dead ends: 218 [2021-11-20 07:19:53,101 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-20 07:19:53,102 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 26 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 07:19:53,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 86 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 07:19:53,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2021-11-20 07:19:53,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 213. [2021-11-20 07:19:53,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 146 states have (on average 1.1643835616438356) internal successors, (170), 148 states have internal predecessors, (170), 41 states have call successors, (41), 25 states have call predecessors, (41), 25 states have return successors, (40), 39 states have call predecessors, (40), 40 states have call successors, (40) [2021-11-20 07:19:53,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 251 transitions. [2021-11-20 07:19:53,150 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 251 transitions. Word has length 78 [2021-11-20 07:19:53,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:19:53,150 INFO L470 AbstractCegarLoop]: Abstraction has 213 states and 251 transitions. [2021-11-20 07:19:53,150 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-20 07:19:53,150 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 251 transitions. [2021-11-20 07:19:53,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-20 07:19:53,152 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:19:53,152 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-20 07:19:53,193 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 07:19:53,376 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-20 07:19:53,377 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:19:53,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:19:53,377 INFO L85 PathProgramCache]: Analyzing trace with hash 1611798954, now seen corresponding path program 2 times [2021-11-20 07:19:53,377 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:19:53,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1122718698] [2021-11-20 07:19:53,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:19:53,378 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:19:53,389 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 07:19:53,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1724073753] [2021-11-20 07:19:53,403 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 07:19:53,403 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:19:53,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:19:53,404 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:19:53,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 07:19:53,486 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 07:19:53,486 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 07:19:53,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-20 07:19:53,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:19:54,595 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 26 proven. 30 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2021-11-20 07:19:54,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:20:16,664 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 26 proven. 30 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2021-11-20 07:20:16,665 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:20:16,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1122718698] [2021-11-20 07:20:16,665 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 07:20:16,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1724073753] [2021-11-20 07:20:16,666 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1724073753] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 07:20:16,666 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 07:20:16,666 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 20 [2021-11-20 07:20:16,667 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000944417] [2021-11-20 07:20:16,667 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 07:20:16,667 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-20 07:20:16,668 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:20:16,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-20 07:20:16,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=280, Unknown=0, NotChecked=0, Total=380 [2021-11-20 07:20:16,669 INFO L87 Difference]: Start difference. First operand 213 states and 251 transitions. Second operand has 20 states, 20 states have (on average 2.35) internal successors, (47), 19 states have internal predecessors, (47), 12 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (26), 10 states have call predecessors, (26), 10 states have call successors, (26) [2021-11-20 07:20:45,822 WARN L227 SmtUtils]: Spent 28.11s on a formula simplification. DAG size of input: 186 DAG size of output: 114 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-20 07:20:48,788 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 07:21:09,353 WARN L227 SmtUtils]: Spent 19.30s on a formula simplification. DAG size of input: 65 DAG size of output: 54 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-20 07:21:18,238 WARN L227 SmtUtils]: Spent 8.70s on a formula simplification. DAG size of input: 84 DAG size of output: 64 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-20 07:21:25,778 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 07:21:28,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:21:28,766 INFO L93 Difference]: Finished difference Result 354 states and 467 transitions. [2021-11-20 07:21:28,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-20 07:21:28,767 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.35) internal successors, (47), 19 states have internal predecessors, (47), 12 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (26), 10 states have call predecessors, (26), 10 states have call successors, (26) Word has length 90 [2021-11-20 07:21:28,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:21:28,769 INFO L225 Difference]: With dead ends: 354 [2021-11-20 07:21:28,769 INFO L226 Difference]: Without dead ends: 297 [2021-11-20 07:21:28,770 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 159 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 65.9s TimeCoverageRelationStatistics Valid=245, Invalid=625, Unknown=0, NotChecked=0, Total=870 [2021-11-20 07:21:28,771 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 188 mSDsluCounter, 641 mSDsCounter, 0 mSdLazyCounter, 775 mSolverCounterSat, 323 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 725 SdHoareTripleChecker+Invalid, 1100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 323 IncrementalHoareTripleChecker+Valid, 775 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.1s IncrementalHoareTripleChecker+Time [2021-11-20 07:21:28,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [196 Valid, 725 Invalid, 1100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [323 Valid, 775 Invalid, 2 Unknown, 0 Unchecked, 9.1s Time] [2021-11-20 07:21:28,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2021-11-20 07:21:28,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 246. [2021-11-20 07:21:28,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 168 states have (on average 1.2023809523809523) internal successors, (202), 170 states have internal predecessors, (202), 49 states have call successors, (49), 28 states have call predecessors, (49), 28 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2021-11-20 07:21:28,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 299 transitions. [2021-11-20 07:21:28,824 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 299 transitions. Word has length 90 [2021-11-20 07:21:28,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:21:28,825 INFO L470 AbstractCegarLoop]: Abstraction has 246 states and 299 transitions. [2021-11-20 07:21:28,825 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.35) internal successors, (47), 19 states have internal predecessors, (47), 12 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (26), 10 states have call predecessors, (26), 10 states have call successors, (26) [2021-11-20 07:21:28,825 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 299 transitions. [2021-11-20 07:21:28,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-20 07:21:28,827 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:21:28,827 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-20 07:21:28,852 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-20 07:21:29,041 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-20 07:21:29,041 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:21:29,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:21:29,042 INFO L85 PathProgramCache]: Analyzing trace with hash -1147408146, now seen corresponding path program 3 times [2021-11-20 07:21:29,042 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:21:29,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [133291604] [2021-11-20 07:21:29,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:21:29,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:21:29,052 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 07:21:29,053 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [948443030] [2021-11-20 07:21:29,053 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 07:21:29,053 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:21:29,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:21:29,054 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:21:29,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 07:21:29,154 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-20 07:21:29,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 07:21:29,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-20 07:21:29,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:21:30,090 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 73 proven. 4 refuted. 0 times theorem prover too weak. 347 trivial. 0 not checked. [2021-11-20 07:21:30,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:21:41,440 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:21:41,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [133291604] [2021-11-20 07:21:41,440 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 07:21:41,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [948443030] [2021-11-20 07:21:41,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [948443030] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 07:21:41,441 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-20 07:21:41,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-11-20 07:21:41,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632179403] [2021-11-20 07:21:41,441 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-20 07:21:41,441 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 07:21:41,441 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:21:41,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 07:21:41,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-20 07:21:41,442 INFO L87 Difference]: Start difference. First operand 246 states and 299 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 07:21:41,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:21:41,615 INFO L93 Difference]: Finished difference Result 256 states and 307 transitions. [2021-11-20 07:21:41,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-20 07:21:41,616 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 95 [2021-11-20 07:21:41,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:21:41,618 INFO L225 Difference]: With dead ends: 256 [2021-11-20 07:21:41,618 INFO L226 Difference]: Without dead ends: 254 [2021-11-20 07:21:41,619 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 97 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2021-11-20 07:21:41,620 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 20 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 07:21:41,620 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 75 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 07:21:41,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-11-20 07:21:41,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 254. [2021-11-20 07:21:41,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 254 states, 174 states have (on average 1.1954022988505748) internal successors, (208), 176 states have internal predecessors, (208), 49 states have call successors, (49), 30 states have call predecessors, (49), 30 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2021-11-20 07:21:41,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 305 transitions. [2021-11-20 07:21:41,676 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 305 transitions. Word has length 95 [2021-11-20 07:21:41,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:21:41,676 INFO L470 AbstractCegarLoop]: Abstraction has 254 states and 305 transitions. [2021-11-20 07:21:41,677 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 07:21:41,677 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 305 transitions. [2021-11-20 07:21:41,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-20 07:21:41,678 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:21:41,678 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:21:41,704 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 07:21:41,893 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-20 07:21:41,893 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:21:41,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:21:41,894 INFO L85 PathProgramCache]: Analyzing trace with hash 1991126182, now seen corresponding path program 1 times [2021-11-20 07:21:41,894 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:21:41,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1066740718] [2021-11-20 07:21:41,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:21:41,894 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:21:41,915 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 07:21:41,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [487157164] [2021-11-20 07:21:41,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:21:41,915 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:21:41,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:21:41,916 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:21:41,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 07:21:41,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:21:41,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-20 07:21:41,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:21:42,188 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 120 proven. 260 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-20 07:21:42,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:21:42,440 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 28 proven. 44 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2021-11-20 07:21:42,440 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:21:42,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1066740718] [2021-11-20 07:21:42,440 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 07:21:42,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [487157164] [2021-11-20 07:21:42,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [487157164] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 07:21:42,441 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 07:21:42,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-11-20 07:21:42,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501047275] [2021-11-20 07:21:42,441 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 07:21:42,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-20 07:21:42,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:21:42,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-20 07:21:42,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-11-20 07:21:42,443 INFO L87 Difference]: Start difference. First operand 254 states and 305 transitions. Second operand has 14 states, 14 states have (on average 4.071428571428571) internal successors, (57), 14 states have internal predecessors, (57), 9 states have call successors, (29), 6 states have call predecessors, (29), 6 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) [2021-11-20 07:21:42,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:21:42,857 INFO L93 Difference]: Finished difference Result 691 states and 866 transitions. [2021-11-20 07:21:42,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-20 07:21:42,858 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.071428571428571) internal successors, (57), 14 states have internal predecessors, (57), 9 states have call successors, (29), 6 states have call predecessors, (29), 6 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) Word has length 96 [2021-11-20 07:21:42,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:21:42,863 INFO L225 Difference]: With dead ends: 691 [2021-11-20 07:21:42,863 INFO L226 Difference]: Without dead ends: 609 [2021-11-20 07:21:42,864 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2021-11-20 07:21:42,864 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 202 mSDsluCounter, 272 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 202 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 07:21:42,865 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [202 Valid, 346 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 179 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 07:21:42,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 609 states. [2021-11-20 07:21:42,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 609 to 531. [2021-11-20 07:21:42,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 531 states, 356 states have (on average 1.2247191011235956) internal successors, (436), 366 states have internal predecessors, (436), 111 states have call successors, (111), 64 states have call predecessors, (111), 63 states have return successors, (107), 100 states have call predecessors, (107), 107 states have call successors, (107) [2021-11-20 07:21:42,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 531 states to 531 states and 654 transitions. [2021-11-20 07:21:42,985 INFO L78 Accepts]: Start accepts. Automaton has 531 states and 654 transitions. Word has length 96 [2021-11-20 07:21:42,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:21:42,985 INFO L470 AbstractCegarLoop]: Abstraction has 531 states and 654 transitions. [2021-11-20 07:21:42,986 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.071428571428571) internal successors, (57), 14 states have internal predecessors, (57), 9 states have call successors, (29), 6 states have call predecessors, (29), 6 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) [2021-11-20 07:21:42,986 INFO L276 IsEmpty]: Start isEmpty. Operand 531 states and 654 transitions. [2021-11-20 07:21:42,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-20 07:21:42,987 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:21:42,988 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:21:43,020 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-20 07:21:43,213 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-20 07:21:43,213 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:21:43,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:21:43,214 INFO L85 PathProgramCache]: Analyzing trace with hash -402850320, now seen corresponding path program 1 times [2021-11-20 07:21:43,214 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:21:43,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546372661] [2021-11-20 07:21:43,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:21:43,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:21:43,230 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 07:21:43,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [67932691] [2021-11-20 07:21:43,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:21:43,235 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:21:43,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:21:43,237 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:21:43,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-20 07:21:43,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:21:43,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-20 07:21:43,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:21:43,669 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 30 proven. 414 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-20 07:21:43,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:21:44,000 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 30 proven. 42 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2021-11-20 07:21:44,001 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:21:44,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546372661] [2021-11-20 07:21:44,001 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 07:21:44,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [67932691] [2021-11-20 07:21:44,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [67932691] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 07:21:44,001 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 07:21:44,001 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 18 [2021-11-20 07:21:44,001 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626598801] [2021-11-20 07:21:44,002 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 07:21:44,002 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-20 07:21:44,002 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:21:44,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-20 07:21:44,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=181, Unknown=0, NotChecked=0, Total=306 [2021-11-20 07:21:44,003 INFO L87 Difference]: Start difference. First operand 531 states and 654 transitions. Second operand has 18 states, 18 states have (on average 4.111111111111111) internal successors, (74), 18 states have internal predecessors, (74), 13 states have call successors, (31), 8 states have call predecessors, (31), 7 states have return successors, (30), 12 states have call predecessors, (30), 12 states have call successors, (30) [2021-11-20 07:21:44,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:21:44,779 INFO L93 Difference]: Finished difference Result 1011 states and 1268 transitions. [2021-11-20 07:21:44,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-20 07:21:44,780 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 4.111111111111111) internal successors, (74), 18 states have internal predecessors, (74), 13 states have call successors, (31), 8 states have call predecessors, (31), 7 states have return successors, (30), 12 states have call predecessors, (30), 12 states have call successors, (30) Word has length 104 [2021-11-20 07:21:44,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:21:44,788 INFO L225 Difference]: With dead ends: 1011 [2021-11-20 07:21:44,788 INFO L226 Difference]: Without dead ends: 976 [2021-11-20 07:21:44,790 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=259, Invalid=497, Unknown=0, NotChecked=0, Total=756 [2021-11-20 07:21:44,791 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 361 mSDsluCounter, 368 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 242 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 361 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 534 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 242 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 07:21:44,791 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [361 Valid, 464 Invalid, 534 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [242 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 07:21:44,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 976 states. [2021-11-20 07:21:44,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 976 to 959. [2021-11-20 07:21:44,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 959 states, 652 states have (on average 1.1932515337423313) internal successors, (778), 661 states have internal predecessors, (778), 197 states have call successors, (197), 110 states have call predecessors, (197), 109 states have return successors, (188), 187 states have call predecessors, (188), 188 states have call successors, (188) [2021-11-20 07:21:44,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 959 states to 959 states and 1163 transitions. [2021-11-20 07:21:44,993 INFO L78 Accepts]: Start accepts. Automaton has 959 states and 1163 transitions. Word has length 104 [2021-11-20 07:21:44,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:21:44,994 INFO L470 AbstractCegarLoop]: Abstraction has 959 states and 1163 transitions. [2021-11-20 07:21:44,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 4.111111111111111) internal successors, (74), 18 states have internal predecessors, (74), 13 states have call successors, (31), 8 states have call predecessors, (31), 7 states have return successors, (30), 12 states have call predecessors, (30), 12 states have call successors, (30) [2021-11-20 07:21:44,994 INFO L276 IsEmpty]: Start isEmpty. Operand 959 states and 1163 transitions. [2021-11-20 07:21:44,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-20 07:21:44,996 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:21:44,996 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:21:45,032 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-20 07:21:45,209 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-20 07:21:45,209 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:21:45,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:21:45,210 INFO L85 PathProgramCache]: Analyzing trace with hash -1040094269, now seen corresponding path program 1 times [2021-11-20 07:21:45,210 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:21:45,210 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110213427] [2021-11-20 07:21:45,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:21:45,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:21:45,216 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 07:21:45,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1004813828] [2021-11-20 07:21:45,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:21:45,216 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:21:45,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:21:45,218 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:21:45,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-20 07:21:45,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:21:45,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-20 07:21:45,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:21:45,585 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 32 proven. 34 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2021-11-20 07:21:45,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:21:47,144 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 32 proven. 34 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2021-11-20 07:21:47,144 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:21:47,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110213427] [2021-11-20 07:21:47,145 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 07:21:47,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1004813828] [2021-11-20 07:21:47,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1004813828] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 07:21:47,145 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 07:21:47,146 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-11-20 07:21:47,146 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065554160] [2021-11-20 07:21:47,146 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 07:21:47,147 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-20 07:21:47,147 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:21:47,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-20 07:21:47,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-20 07:21:47,148 INFO L87 Difference]: Start difference. First operand 959 states and 1163 transitions. Second operand has 10 states, 10 states have (on average 4.9) internal successors, (49), 9 states have internal predecessors, (49), 6 states have call successors, (34), 2 states have call predecessors, (34), 1 states have return successors, (32), 6 states have call predecessors, (32), 6 states have call successors, (32) [2021-11-20 07:21:47,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:21:47,751 INFO L93 Difference]: Finished difference Result 961 states and 1164 transitions. [2021-11-20 07:21:47,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-20 07:21:47,752 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.9) internal successors, (49), 9 states have internal predecessors, (49), 6 states have call successors, (34), 2 states have call predecessors, (34), 1 states have return successors, (32), 6 states have call predecessors, (32), 6 states have call successors, (32) Word has length 106 [2021-11-20 07:21:47,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:21:47,759 INFO L225 Difference]: With dead ends: 961 [2021-11-20 07:21:47,759 INFO L226 Difference]: Without dead ends: 951 [2021-11-20 07:21:47,760 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 200 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-11-20 07:21:47,761 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 3 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 282 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 07:21:47,761 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 282 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 07:21:47,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 951 states. [2021-11-20 07:21:48,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 951 to 951. [2021-11-20 07:21:48,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 951 states, 647 states have (on average 1.1916537867078825) internal successors, (771), 656 states have internal predecessors, (771), 195 states have call successors, (195), 108 states have call predecessors, (195), 108 states have return successors, (187), 186 states have call predecessors, (187), 187 states have call successors, (187) [2021-11-20 07:21:48,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 951 states to 951 states and 1153 transitions. [2021-11-20 07:21:48,021 INFO L78 Accepts]: Start accepts. Automaton has 951 states and 1153 transitions. Word has length 106 [2021-11-20 07:21:48,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:21:48,022 INFO L470 AbstractCegarLoop]: Abstraction has 951 states and 1153 transitions. [2021-11-20 07:21:48,022 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.9) internal successors, (49), 9 states have internal predecessors, (49), 6 states have call successors, (34), 2 states have call predecessors, (34), 1 states have return successors, (32), 6 states have call predecessors, (32), 6 states have call successors, (32) [2021-11-20 07:21:48,023 INFO L276 IsEmpty]: Start isEmpty. Operand 951 states and 1153 transitions. [2021-11-20 07:21:48,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-20 07:21:48,025 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:21:48,025 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:21:48,059 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-20 07:21:48,245 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-20 07:21:48,246 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:21:48,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:21:48,246 INFO L85 PathProgramCache]: Analyzing trace with hash 1392087445, now seen corresponding path program 1 times [2021-11-20 07:21:48,246 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:21:48,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [692164911] [2021-11-20 07:21:48,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:21:48,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:21:48,257 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 07:21:48,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [768273001] [2021-11-20 07:21:48,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:21:48,258 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:21:48,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:21:48,289 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:21:48,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-20 07:21:48,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:21:48,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-20 07:21:48,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:21:48,786 INFO L134 CoverageAnalysis]: Checked inductivity of 560 backedges. 185 proven. 0 refuted. 0 times theorem prover too weak. 375 trivial. 0 not checked. [2021-11-20 07:21:48,786 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 07:21:48,786 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:21:48,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [692164911] [2021-11-20 07:21:48,787 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 07:21:48,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [768273001] [2021-11-20 07:21:48,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [768273001] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 07:21:48,787 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 07:21:48,787 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-20 07:21:48,788 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634502749] [2021-11-20 07:21:48,788 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 07:21:48,789 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 07:21:48,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:21:48,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 07:21:48,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-20 07:21:48,790 INFO L87 Difference]: Start difference. First operand 951 states and 1153 transitions. Second operand has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 5 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) [2021-11-20 07:21:49,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:21:49,289 INFO L93 Difference]: Finished difference Result 1418 states and 1767 transitions. [2021-11-20 07:21:49,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-20 07:21:49,290 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 5 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) Word has length 108 [2021-11-20 07:21:49,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:21:49,299 INFO L225 Difference]: With dead ends: 1418 [2021-11-20 07:21:49,299 INFO L226 Difference]: Without dead ends: 1081 [2021-11-20 07:21:49,301 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-20 07:21:49,302 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 18 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 297 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 07:21:49,302 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 297 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 07:21:49,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1081 states. [2021-11-20 07:21:49,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1081 to 845. [2021-11-20 07:21:49,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 845 states, 578 states have (on average 1.1591695501730104) internal successors, (670), 586 states have internal predecessors, (670), 159 states have call successors, (159), 108 states have call predecessors, (159), 107 states have return successors, (151), 150 states have call predecessors, (151), 151 states have call successors, (151) [2021-11-20 07:21:49,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 845 states to 845 states and 980 transitions. [2021-11-20 07:21:49,512 INFO L78 Accepts]: Start accepts. Automaton has 845 states and 980 transitions. Word has length 108 [2021-11-20 07:21:49,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:21:49,513 INFO L470 AbstractCegarLoop]: Abstraction has 845 states and 980 transitions. [2021-11-20 07:21:49,514 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 5 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) [2021-11-20 07:21:49,514 INFO L276 IsEmpty]: Start isEmpty. Operand 845 states and 980 transitions. [2021-11-20 07:21:49,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-20 07:21:49,516 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:21:49,517 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-11-20 07:21:49,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-20 07:21:49,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-20 07:21:49,738 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:21:49,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:21:49,739 INFO L85 PathProgramCache]: Analyzing trace with hash -312380604, now seen corresponding path program 2 times [2021-11-20 07:21:49,739 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:21:49,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997717941] [2021-11-20 07:21:49,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:21:49,739 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:21:49,751 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 07:21:49,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1005727788] [2021-11-20 07:21:49,767 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 07:21:49,767 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:21:49,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:21:49,768 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:21:49,783 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-20 07:21:49,854 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 07:21:49,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 07:21:49,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-20 07:21:49,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:21:50,129 INFO L134 CoverageAnalysis]: Checked inductivity of 644 backedges. 177 proven. 36 refuted. 0 times theorem prover too weak. 431 trivial. 0 not checked. [2021-11-20 07:21:50,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:21:50,763 INFO L134 CoverageAnalysis]: Checked inductivity of 644 backedges. 67 proven. 30 refuted. 0 times theorem prover too weak. 547 trivial. 0 not checked. [2021-11-20 07:21:50,764 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:21:50,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997717941] [2021-11-20 07:21:50,764 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 07:21:50,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1005727788] [2021-11-20 07:21:50,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1005727788] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 07:21:50,764 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 07:21:50,764 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-11-20 07:21:50,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460354528] [2021-11-20 07:21:50,765 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 07:21:50,765 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-20 07:21:50,765 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:21:50,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-20 07:21:50,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2021-11-20 07:21:50,767 INFO L87 Difference]: Start difference. First operand 845 states and 980 transitions. Second operand has 12 states, 12 states have (on average 4.75) internal successors, (57), 12 states have internal predecessors, (57), 9 states have call successors, (34), 2 states have call predecessors, (34), 2 states have return successors, (34), 9 states have call predecessors, (34), 9 states have call successors, (34) [2021-11-20 07:21:51,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:21:51,290 INFO L93 Difference]: Finished difference Result 1157 states and 1369 transitions. [2021-11-20 07:21:51,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-20 07:21:51,291 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 12 states have internal predecessors, (57), 9 states have call successors, (34), 2 states have call predecessors, (34), 2 states have return successors, (34), 9 states have call predecessors, (34), 9 states have call successors, (34) Word has length 118 [2021-11-20 07:21:51,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:21:51,298 INFO L225 Difference]: With dead ends: 1157 [2021-11-20 07:21:51,298 INFO L226 Difference]: Without dead ends: 884 [2021-11-20 07:21:51,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 222 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2021-11-20 07:21:51,302 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 19 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 07:21:51,302 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 263 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 158 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 07:21:51,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 884 states. [2021-11-20 07:21:51,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 884 to 865. [2021-11-20 07:21:51,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 865 states, 592 states have (on average 1.1554054054054055) internal successors, (684), 600 states have internal predecessors, (684), 165 states have call successors, (165), 108 states have call predecessors, (165), 107 states have return successors, (157), 156 states have call predecessors, (157), 157 states have call successors, (157) [2021-11-20 07:21:51,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 865 states to 865 states and 1006 transitions. [2021-11-20 07:21:51,571 INFO L78 Accepts]: Start accepts. Automaton has 865 states and 1006 transitions. Word has length 118 [2021-11-20 07:21:51,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:21:51,572 INFO L470 AbstractCegarLoop]: Abstraction has 865 states and 1006 transitions. [2021-11-20 07:21:51,572 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 12 states have internal predecessors, (57), 9 states have call successors, (34), 2 states have call predecessors, (34), 2 states have return successors, (34), 9 states have call predecessors, (34), 9 states have call successors, (34) [2021-11-20 07:21:51,573 INFO L276 IsEmpty]: Start isEmpty. Operand 865 states and 1006 transitions. [2021-11-20 07:21:51,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-20 07:21:51,575 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:21:51,575 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:21:51,621 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-20 07:21:51,801 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:21:51,802 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:21:51,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:21:51,802 INFO L85 PathProgramCache]: Analyzing trace with hash 146904463, now seen corresponding path program 2 times [2021-11-20 07:21:51,802 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:21:51,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090268345] [2021-11-20 07:21:51,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:21:51,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:21:51,812 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 07:21:51,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1231113645] [2021-11-20 07:21:51,813 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 07:21:51,813 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:21:51,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:21:51,814 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:21:51,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-20 07:21:51,890 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 07:21:51,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 07:21:51,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-20 07:21:51,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:21:52,168 INFO L134 CoverageAnalysis]: Checked inductivity of 699 backedges. 102 proven. 51 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2021-11-20 07:21:52,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:21:52,647 INFO L134 CoverageAnalysis]: Checked inductivity of 699 backedges. 69 proven. 18 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2021-11-20 07:21:52,648 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:21:52,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2090268345] [2021-11-20 07:21:52,648 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 07:21:52,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1231113645] [2021-11-20 07:21:52,649 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1231113645] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 07:21:52,649 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 07:21:52,649 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2021-11-20 07:21:52,649 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851276551] [2021-11-20 07:21:52,650 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 07:21:52,650 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-20 07:21:52,651 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:21:52,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-20 07:21:52,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-20 07:21:52,652 INFO L87 Difference]: Start difference. First operand 865 states and 1006 transitions. Second operand has 9 states, 9 states have (on average 6.111111111111111) internal successors, (55), 9 states have internal predecessors, (55), 8 states have call successors, (35), 2 states have call predecessors, (35), 2 states have return successors, (34), 8 states have call predecessors, (34), 8 states have call successors, (34) [2021-11-20 07:21:52,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:21:52,936 INFO L93 Difference]: Finished difference Result 992 states and 1123 transitions. [2021-11-20 07:21:52,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 07:21:52,937 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 6.111111111111111) internal successors, (55), 9 states have internal predecessors, (55), 8 states have call successors, (35), 2 states have call predecessors, (35), 2 states have return successors, (34), 8 states have call predecessors, (34), 8 states have call successors, (34) Word has length 120 [2021-11-20 07:21:52,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:21:52,948 INFO L225 Difference]: With dead ends: 992 [2021-11-20 07:21:52,949 INFO L226 Difference]: Without dead ends: 775 [2021-11-20 07:21:52,950 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 228 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-20 07:21:52,954 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 2 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 07:21:52,954 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 250 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 07:21:52,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 775 states. [2021-11-20 07:21:53,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 775 to 773. [2021-11-20 07:21:53,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 773 states, 528 states have (on average 1.1553030303030303) internal successors, (610), 536 states have internal predecessors, (610), 143 states have call successors, (143), 102 states have call predecessors, (143), 101 states have return successors, (135), 134 states have call predecessors, (135), 135 states have call successors, (135) [2021-11-20 07:21:53,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 773 states to 773 states and 888 transitions. [2021-11-20 07:21:53,176 INFO L78 Accepts]: Start accepts. Automaton has 773 states and 888 transitions. Word has length 120 [2021-11-20 07:21:53,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:21:53,177 INFO L470 AbstractCegarLoop]: Abstraction has 773 states and 888 transitions. [2021-11-20 07:21:53,177 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 6.111111111111111) internal successors, (55), 9 states have internal predecessors, (55), 8 states have call successors, (35), 2 states have call predecessors, (35), 2 states have return successors, (34), 8 states have call predecessors, (34), 8 states have call successors, (34) [2021-11-20 07:21:53,178 INFO L276 IsEmpty]: Start isEmpty. Operand 773 states and 888 transitions. [2021-11-20 07:21:53,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-20 07:21:53,180 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:21:53,180 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2021-11-20 07:21:53,226 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-20 07:21:53,393 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:21:53,393 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:21:53,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:21:53,394 INFO L85 PathProgramCache]: Analyzing trace with hash -405037921, now seen corresponding path program 4 times [2021-11-20 07:21:53,394 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:21:53,394 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576067622] [2021-11-20 07:21:53,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:21:53,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:21:53,411 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 07:21:53,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1722364170] [2021-11-20 07:21:53,413 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 07:21:53,413 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:21:53,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:21:53,414 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:21:53,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99e48714-7662-421f-8846-0e3b85e64002/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-20 07:21:53,799 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 07:21:53,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 07:21:53,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-20 07:21:53,807 INFO L286 TraceCheckSpWp]: Computing forward predicates...