./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/termination-crafted/LexIndexValue-Pointer-3.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/termination-crafted/LexIndexValue-Pointer-3.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-64bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 29e5ebbacca85d2fb1b0bd6d164adabb3234eca085536ff1d3458c8110967632 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-02 22:45:16,695 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-02 22:45:16,699 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-02 22:45:16,751 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-02 22:45:16,752 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-02 22:45:16,753 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-02 22:45:16,755 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-02 22:45:16,758 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-02 22:45:16,761 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-02 22:45:16,763 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-02 22:45:16,764 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-02 22:45:16,766 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-02 22:45:16,767 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-02 22:45:16,769 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-02 22:45:16,771 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-02 22:45:16,773 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-02 22:45:16,775 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-02 22:45:16,777 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-02 22:45:16,780 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-02 22:45:16,784 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-02 22:45:16,787 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-02 22:45:16,789 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-02 22:45:16,791 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-02 22:45:16,793 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-02 22:45:16,797 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-02 22:45:16,798 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-02 22:45:16,799 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-02 22:45:16,800 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-02 22:45:16,801 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-02 22:45:16,802 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-02 22:45:16,803 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-02 22:45:16,804 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-02 22:45:16,806 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-02 22:45:16,807 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-02 22:45:16,808 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-02 22:45:16,809 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-02 22:45:16,810 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-02 22:45:16,811 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-02 22:45:16,811 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-02 22:45:16,813 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-02 22:45:16,814 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-02 22:45:16,815 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-64bit-Automizer_Default.epf [2021-11-02 22:45:16,846 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-02 22:45:16,846 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-02 22:45:16,847 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-02 22:45:16,847 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-02 22:45:16,849 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-02 22:45:16,849 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-02 22:45:16,850 INFO L138 SettingsManager]: * Use SBE=true [2021-11-02 22:45:16,850 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-02 22:45:16,851 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-02 22:45:16,851 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-02 22:45:16,851 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-02 22:45:16,852 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-02 22:45:16,852 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-02 22:45:16,852 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-02 22:45:16,853 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-02 22:45:16,853 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-02 22:45:16,853 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-02 22:45:16,854 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-02 22:45:16,854 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-02 22:45:16,854 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-02 22:45:16,854 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:45:16,855 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-02 22:45:16,855 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-02 22:45:16,855 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-02 22:45:16,856 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-02 22:45:16,856 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-02 22:45:16,856 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_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 29e5ebbacca85d2fb1b0bd6d164adabb3234eca085536ff1d3458c8110967632 [2021-11-02 22:45:17,162 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-02 22:45:17,196 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-02 22:45:17,201 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-02 22:45:17,203 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-02 22:45:17,204 INFO L275 PluginConnector]: CDTParser initialized [2021-11-02 22:45:17,205 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/../../sv-benchmarks/c/termination-crafted/LexIndexValue-Pointer-3.c [2021-11-02 22:45:17,333 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/data/107a24071/9d57566abacb4cf9bdca64e6b00e5cbe/FLAG4a4bc2905 [2021-11-02 22:45:17,843 INFO L306 CDTParser]: Found 1 translation units. [2021-11-02 22:45:17,844 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/sv-benchmarks/c/termination-crafted/LexIndexValue-Pointer-3.c [2021-11-02 22:45:17,852 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/data/107a24071/9d57566abacb4cf9bdca64e6b00e5cbe/FLAG4a4bc2905 [2021-11-02 22:45:18,214 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/data/107a24071/9d57566abacb4cf9bdca64e6b00e5cbe [2021-11-02 22:45:18,218 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-02 22:45:18,220 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-02 22:45:18,230 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-02 22:45:18,231 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-02 22:45:18,236 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-02 22:45:18,237 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:45:18" (1/1) ... [2021-11-02 22:45:18,239 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f6f8ed9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:45:18, skipping insertion in model container [2021-11-02 22:45:18,241 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:45:18" (1/1) ... [2021-11-02 22:45:18,252 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-02 22:45:18,271 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-02 22:45:18,483 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:45:18,493 INFO L203 MainTranslator]: Completed pre-run [2021-11-02 22:45:18,511 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:45:18,528 INFO L208 MainTranslator]: Completed translation [2021-11-02 22:45:18,528 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:45:18 WrapperNode [2021-11-02 22:45:18,529 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-02 22:45:18,530 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-02 22:45:18,530 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-02 22:45:18,531 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-02 22:45:18,545 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:45:18" (1/1) ... [2021-11-02 22:45:18,546 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:45:18" (1/1) ... [2021-11-02 22:45:18,554 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:45:18" (1/1) ... [2021-11-02 22:45:18,554 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:45:18" (1/1) ... [2021-11-02 22:45:18,563 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:45:18" (1/1) ... [2021-11-02 22:45:18,568 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:45:18" (1/1) ... [2021-11-02 22:45:18,569 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:45:18" (1/1) ... [2021-11-02 22:45:18,571 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-02 22:45:18,573 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-02 22:45:18,573 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-02 22:45:18,573 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-02 22:45:18,574 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:45:18" (1/1) ... [2021-11-02 22:45:18,584 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:45:18,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:18,611 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-02 22:45:18,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-02 22:45:18,651 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-02 22:45:18,651 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-02 22:45:18,652 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-02 22:45:18,652 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-02 22:45:18,652 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-02 22:45:18,652 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-11-02 22:45:18,653 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-02 22:45:18,653 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-02 22:45:18,653 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-02 22:45:18,653 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-02 22:45:18,654 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-02 22:45:18,654 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-02 22:45:18,654 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-02 22:45:18,930 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-02 22:45:18,930 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-02 22:45:18,932 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:45:18 BoogieIcfgContainer [2021-11-02 22:45:18,933 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-02 22:45:18,935 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-02 22:45:18,935 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-02 22:45:18,939 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-02 22:45:18,940 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 10:45:18" (1/3) ... [2021-11-02 22:45:18,941 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@450cd4a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:45:18, skipping insertion in model container [2021-11-02 22:45:18,941 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:45:18" (2/3) ... [2021-11-02 22:45:18,942 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@450cd4a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:45:18, skipping insertion in model container [2021-11-02 22:45:18,942 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:45:18" (3/3) ... [2021-11-02 22:45:18,943 INFO L111 eAbstractionObserver]: Analyzing ICFG LexIndexValue-Pointer-3.c [2021-11-02 22:45:18,963 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-02 22:45:18,963 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 12 error locations. [2021-11-02 22:45:19,065 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-02 22:45:19,073 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-02 22:45:19,074 INFO L340 AbstractCegarLoop]: Starting to check reachability of 12 error locations. [2021-11-02 22:45:19,093 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 20 states have (on average 1.85) internal successors, (37), 32 states have internal predecessors, (37), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:45:19,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-02 22:45:19,103 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:19,104 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:19,104 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:19,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:19,112 INFO L85 PathProgramCache]: Analyzing trace with hash 1512530378, now seen corresponding path program 1 times [2021-11-02 22:45:19,123 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:19,124 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102362829] [2021-11-02 22:45:19,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:19,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:19,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:19,445 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:19,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:19,458 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:19,459 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:19,460 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102362829] [2021-11-02 22:45:19,461 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [102362829] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:45:19,461 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:45:19,461 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:45:19,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102372926] [2021-11-02 22:45:19,469 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:45:19,470 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:19,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:45:19,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:45:19,490 INFO L87 Difference]: Start difference. First operand has 37 states, 20 states have (on average 1.85) internal successors, (37), 32 states have internal predecessors, (37), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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) [2021-11-02 22:45:19,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:19,656 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2021-11-02 22:45:19,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:45:19,658 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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 8 [2021-11-02 22:45:19,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:19,667 INFO L225 Difference]: With dead ends: 42 [2021-11-02 22:45:19,667 INFO L226 Difference]: Without dead ends: 39 [2021-11-02 22:45:19,669 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:45:19,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-02 22:45:19,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2021-11-02 22:45:19,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 21 states have (on average 1.7142857142857142) internal successors, (36), 32 states have internal predecessors, (36), 2 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) [2021-11-02 22:45:19,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2021-11-02 22:45:19,713 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 8 [2021-11-02 22:45:19,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:19,714 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2021-11-02 22:45:19,715 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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) [2021-11-02 22:45:19,715 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2021-11-02 22:45:19,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-02 22:45:19,716 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:19,716 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:19,717 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-02 22:45:19,717 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:19,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:19,719 INFO L85 PathProgramCache]: Analyzing trace with hash 1512530377, now seen corresponding path program 1 times [2021-11-02 22:45:19,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:19,719 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1389581409] [2021-11-02 22:45:19,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:19,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:19,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:19,806 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:19,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:19,831 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:19,831 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:19,832 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1389581409] [2021-11-02 22:45:19,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1389581409] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:45:19,832 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:45:19,833 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:45:19,833 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908329074] [2021-11-02 22:45:19,834 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:45:19,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:19,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:45:19,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:45:19,837 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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) [2021-11-02 22:45:19,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:19,944 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-11-02 22:45:19,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:45:19,945 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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 8 [2021-11-02 22:45:19,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:19,946 INFO L225 Difference]: With dead ends: 34 [2021-11-02 22:45:19,946 INFO L226 Difference]: Without dead ends: 34 [2021-11-02 22:45:19,947 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:45:19,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-02 22:45:19,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-11-02 22:45:19,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 30 states have internal predecessors, (33), 2 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) [2021-11-02 22:45:19,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2021-11-02 22:45:19,953 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 8 [2021-11-02 22:45:19,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:19,954 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2021-11-02 22:45:19,954 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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) [2021-11-02 22:45:19,954 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2021-11-02 22:45:19,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-02 22:45:19,955 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:19,955 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:19,956 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-02 22:45:19,956 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:19,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:19,957 INFO L85 PathProgramCache]: Analyzing trace with hash 1352220941, now seen corresponding path program 1 times [2021-11-02 22:45:19,957 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:19,957 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879612928] [2021-11-02 22:45:19,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:19,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:19,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:20,172 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:20,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:20,193 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:20,193 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:20,194 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [879612928] [2021-11-02 22:45:20,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [879612928] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:20,195 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1113442426] [2021-11-02 22:45:20,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:20,195 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:20,197 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:20,199 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:20,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-02 22:45:20,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:20,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-02 22:45:20,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:20,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:45:20,591 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:20,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1113442426] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:20,593 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:20,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 3] total 6 [2021-11-02 22:45:20,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915630086] [2021-11-02 22:45:20,597 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:45:20,597 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:20,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:45:20,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:45:20,609 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:20,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:20,746 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2021-11-02 22:45:20,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:45:20,747 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-02 22:45:20,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:20,753 INFO L225 Difference]: With dead ends: 39 [2021-11-02 22:45:20,753 INFO L226 Difference]: Without dead ends: 39 [2021-11-02 22:45:20,756 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:45:20,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-02 22:45:20,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-11-02 22:45:20,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 28 states have (on average 1.3571428571428572) internal successors, (38), 35 states have internal predecessors, (38), 2 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) [2021-11-02 22:45:20,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2021-11-02 22:45:20,773 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 12 [2021-11-02 22:45:20,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:20,774 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2021-11-02 22:45:20,774 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:20,775 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2021-11-02 22:45:20,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-02 22:45:20,776 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:20,777 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:20,823 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:20,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:20,994 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr2REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:20,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:20,995 INFO L85 PathProgramCache]: Analyzing trace with hash -952719167, now seen corresponding path program 1 times [2021-11-02 22:45:20,995 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:20,995 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30257152] [2021-11-02 22:45:20,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:20,996 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:21,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:21,090 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:21,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:21,117 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-02 22:45:21,118 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:21,118 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30257152] [2021-11-02 22:45:21,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30257152] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:45:21,118 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:45:21,119 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:45:21,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380200129] [2021-11-02 22:45:21,119 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:45:21,120 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:21,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:45:21,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:45:21,121 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 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) [2021-11-02 22:45:21,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:21,212 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2021-11-02 22:45:21,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:45:21,214 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 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 21 [2021-11-02 22:45:21,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:21,216 INFO L225 Difference]: With dead ends: 36 [2021-11-02 22:45:21,216 INFO L226 Difference]: Without dead ends: 36 [2021-11-02 22:45:21,218 INFO L786 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 [2021-11-02 22:45:21,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-02 22:45:21,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-02 22:45:21,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 28 states have (on average 1.25) internal successors, (35), 32 states have internal predecessors, (35), 2 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) [2021-11-02 22:45:21,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-11-02 22:45:21,242 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 21 [2021-11-02 22:45:21,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:21,243 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-11-02 22:45:21,243 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 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) [2021-11-02 22:45:21,244 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-11-02 22:45:21,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-02 22:45:21,245 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:21,245 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:21,245 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-02 22:45:21,246 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:21,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:21,247 INFO L85 PathProgramCache]: Analyzing trace with hash -952719166, now seen corresponding path program 1 times [2021-11-02 22:45:21,247 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:21,248 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255709199] [2021-11-02 22:45:21,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:21,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:21,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:21,356 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:21,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:21,363 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:21,363 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:21,364 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255709199] [2021-11-02 22:45:21,364 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255709199] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:21,364 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [867638191] [2021-11-02 22:45:21,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:21,365 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:21,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:21,366 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:21,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-02 22:45:21,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:21,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-02 22:45:21,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:21,535 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:21,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [867638191] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:21,536 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:21,536 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-11-02 22:45:21,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269202655] [2021-11-02 22:45:21,537 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:45:21,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:21,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:45:21,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:45:21,539 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:21,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:21,606 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2021-11-02 22:45:21,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:45:21,607 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-11-02 22:45:21,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:21,608 INFO L225 Difference]: With dead ends: 43 [2021-11-02 22:45:21,608 INFO L226 Difference]: Without dead ends: 43 [2021-11-02 22:45:21,609 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:45:21,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-02 22:45:21,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2021-11-02 22:45:21,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 32 states have (on average 1.21875) internal successors, (39), 36 states have internal predecessors, (39), 2 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) [2021-11-02 22:45:21,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-11-02 22:45:21,615 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 21 [2021-11-02 22:45:21,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:21,615 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-11-02 22:45:21,616 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:21,616 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-11-02 22:45:21,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-02 22:45:21,617 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:21,617 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:21,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:21,845 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:21,846 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:21,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:21,847 INFO L85 PathProgramCache]: Analyzing trace with hash -535630241, now seen corresponding path program 2 times [2021-11-02 22:45:21,847 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:21,847 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349531164] [2021-11-02 22:45:21,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:21,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:21,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:21,950 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:21,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:21,956 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:21,957 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:21,957 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349531164] [2021-11-02 22:45:21,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [349531164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:21,958 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1250171035] [2021-11-02 22:45:21,958 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:45:21,958 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:21,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:21,959 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:21,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-02 22:45:22,043 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-02 22:45:22,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:22,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-02 22:45:22,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:22,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:45:22,339 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-02 22:45:22,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1250171035] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:45:22,340 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:45:22,340 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 10 [2021-11-02 22:45:22,341 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608447703] [2021-11-02 22:45:22,341 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:45:22,342 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:22,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:45:22,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:45:22,344 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:22,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:22,413 INFO L93 Difference]: Finished difference Result 53 states and 56 transitions. [2021-11-02 22:45:22,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:45:22,414 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 1 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 25 [2021-11-02 22:45:22,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:22,418 INFO L225 Difference]: With dead ends: 53 [2021-11-02 22:45:22,418 INFO L226 Difference]: Without dead ends: 53 [2021-11-02 22:45:22,419 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:45:22,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-02 22:45:22,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 47. [2021-11-02 22:45:22,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 43 states have internal predecessors, (48), 2 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) [2021-11-02 22:45:22,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2021-11-02 22:45:22,440 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 25 [2021-11-02 22:45:22,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:22,440 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2021-11-02 22:45:22,441 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:22,441 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2021-11-02 22:45:22,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-02 22:45:22,442 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:22,442 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:22,489 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:22,643 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:22,643 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr9ASSERT_VIOLATIONMEMORY_FREE === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:22,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:22,644 INFO L85 PathProgramCache]: Analyzing trace with hash -1157031131, now seen corresponding path program 1 times [2021-11-02 22:45:22,644 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:22,644 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1023603201] [2021-11-02 22:45:22,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:22,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:22,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:22,754 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:22,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:22,774 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-02 22:45:22,774 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:22,775 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1023603201] [2021-11-02 22:45:22,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1023603201] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:45:22,775 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:45:22,775 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:45:22,776 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214577494] [2021-11-02 22:45:22,776 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:45:22,777 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:22,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:45:22,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:45:22,786 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand has 4 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 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) [2021-11-02 22:45:22,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:22,848 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2021-11-02 22:45:22,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:45:22,849 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 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 28 [2021-11-02 22:45:22,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:22,852 INFO L225 Difference]: With dead ends: 46 [2021-11-02 22:45:22,852 INFO L226 Difference]: Without dead ends: 46 [2021-11-02 22:45:22,853 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:45:22,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-02 22:45:22,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-11-02 22:45:22,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 39 states have (on average 1.205128205128205) internal successors, (47), 42 states have internal predecessors, (47), 2 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) [2021-11-02 22:45:22,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-11-02 22:45:22,870 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 28 [2021-11-02 22:45:22,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:22,872 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-11-02 22:45:22,872 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 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) [2021-11-02 22:45:22,872 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-11-02 22:45:22,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-02 22:45:22,874 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:22,874 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:22,874 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-02 22:45:22,875 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:22,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:22,876 INFO L85 PathProgramCache]: Analyzing trace with hash -1157029730, now seen corresponding path program 1 times [2021-11-02 22:45:22,876 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:22,876 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137431696] [2021-11-02 22:45:22,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:22,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:22,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:23,026 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:23,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:23,035 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:45:23,036 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:23,042 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137431696] [2021-11-02 22:45:23,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1137431696] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:23,047 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1550575544] [2021-11-02 22:45:23,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:23,047 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:23,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:23,055 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:23,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-02 22:45:23,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:23,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-02 22:45:23,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:23,297 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:45:23,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1550575544] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:23,297 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:23,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-11-02 22:45:23,298 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914871212] [2021-11-02 22:45:23,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:45:23,299 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:23,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:45:23,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:45:23,300 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:23,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:23,373 INFO L93 Difference]: Finished difference Result 53 states and 57 transitions. [2021-11-02 22:45:23,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:45:23,373 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-11-02 22:45:23,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:23,377 INFO L225 Difference]: With dead ends: 53 [2021-11-02 22:45:23,377 INFO L226 Difference]: Without dead ends: 53 [2021-11-02 22:45:23,378 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:45:23,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-02 22:45:23,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2021-11-02 22:45:23,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 43 states have (on average 1.186046511627907) internal successors, (51), 46 states have internal predecessors, (51), 2 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) [2021-11-02 22:45:23,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2021-11-02 22:45:23,385 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 28 [2021-11-02 22:45:23,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:23,386 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2021-11-02 22:45:23,386 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:23,386 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2021-11-02 22:45:23,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-02 22:45:23,390 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:23,390 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:23,433 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:23,617 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:23,618 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:23,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:23,618 INFO L85 PathProgramCache]: Analyzing trace with hash -1730297759, now seen corresponding path program 2 times [2021-11-02 22:45:23,618 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:23,619 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589879920] [2021-11-02 22:45:23,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:23,619 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:23,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:23,744 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:23,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:23,753 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:45:23,753 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:23,754 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589879920] [2021-11-02 22:45:23,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [589879920] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:23,754 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [491810850] [2021-11-02 22:45:23,754 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:45:23,755 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:23,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:23,762 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:23,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-02 22:45:23,867 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:45:23,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:23,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-02 22:45:23,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:23,995 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:45:23,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [491810850] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:23,996 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:23,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-11-02 22:45:23,997 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525472884] [2021-11-02 22:45:24,000 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:45:24,009 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:24,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:45:24,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:45:24,011 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 10 states, 10 states have (on average 3.5) internal successors, (35), 9 states have internal predecessors, (35), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:24,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:24,093 INFO L93 Difference]: Finished difference Result 57 states and 61 transitions. [2021-11-02 22:45:24,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:45:24,094 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 9 states have internal predecessors, (35), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-11-02 22:45:24,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:24,095 INFO L225 Difference]: With dead ends: 57 [2021-11-02 22:45:24,095 INFO L226 Difference]: Without dead ends: 57 [2021-11-02 22:45:24,095 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:45:24,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-02 22:45:24,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2021-11-02 22:45:24,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 50 states have internal predecessors, (55), 2 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) [2021-11-02 22:45:24,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2021-11-02 22:45:24,100 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 32 [2021-11-02 22:45:24,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:24,100 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2021-11-02 22:45:24,101 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 9 states have internal predecessors, (35), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:24,101 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2021-11-02 22:45:24,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-02 22:45:24,102 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:24,102 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:24,134 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:24,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:24,318 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:24,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:24,319 INFO L85 PathProgramCache]: Analyzing trace with hash 939968164, now seen corresponding path program 3 times [2021-11-02 22:45:24,319 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:24,319 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716488562] [2021-11-02 22:45:24,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:24,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:24,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:24,428 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:24,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:24,437 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:45:24,438 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:24,438 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1716488562] [2021-11-02 22:45:24,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1716488562] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:24,440 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1423003693] [2021-11-02 22:45:24,440 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:45:24,440 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:24,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:24,455 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:24,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-02 22:45:24,574 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-02 22:45:24,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:24,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-02 22:45:24,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:24,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:45:24,943 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-02 22:45:24,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1423003693] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:24,944 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:24,944 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5] total 14 [2021-11-02 22:45:24,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787609259] [2021-11-02 22:45:24,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-02 22:45:24,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:24,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-02 22:45:24,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:45:24,955 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand has 14 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 13 states have internal predecessors, (45), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:25,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:25,252 INFO L93 Difference]: Finished difference Result 79 states and 83 transitions. [2021-11-02 22:45:25,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-02 22:45:25,253 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 13 states have internal predecessors, (45), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-11-02 22:45:25,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:25,254 INFO L225 Difference]: With dead ends: 79 [2021-11-02 22:45:25,254 INFO L226 Difference]: Without dead ends: 79 [2021-11-02 22:45:25,255 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=131, Invalid=421, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:45:25,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-02 22:45:25,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 65. [2021-11-02 22:45:25,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 58 states have (on average 1.1724137931034482) internal successors, (68), 61 states have internal predecessors, (68), 2 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) [2021-11-02 22:45:25,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 71 transitions. [2021-11-02 22:45:25,260 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 71 transitions. Word has length 36 [2021-11-02 22:45:25,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:25,261 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 71 transitions. [2021-11-02 22:45:25,261 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 13 states have internal predecessors, (45), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:25,261 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 71 transitions. [2021-11-02 22:45:25,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-02 22:45:25,262 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:25,262 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:25,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:25,463 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-02 22:45:25,463 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting mainErr11ENSURES_VIOLATIONMEMORY_LEAK === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:25,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:25,464 INFO L85 PathProgramCache]: Analyzing trace with hash 1802057073, now seen corresponding path program 1 times [2021-11-02 22:45:25,464 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:25,464 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1213946285] [2021-11-02 22:45:25,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:25,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:25,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:25,621 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:25,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:25,632 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:25,632 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:25,633 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1213946285] [2021-11-02 22:45:25,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1213946285] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:25,633 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1659968078] [2021-11-02 22:45:25,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:25,634 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:25,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:25,642 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:25,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-02 22:45:25,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:25,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-02 22:45:25,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:25,951 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:25,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1659968078] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:25,952 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:25,952 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-11-02 22:45:25,953 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878724681] [2021-11-02 22:45:25,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:45:25,955 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:25,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:45:25,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:45:25,957 INFO L87 Difference]: Start difference. First operand 65 states and 71 transitions. Second operand has 12 states, 12 states have (on average 3.75) internal successors, (45), 11 states have internal predecessors, (45), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:26,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:26,036 INFO L93 Difference]: Finished difference Result 72 states and 78 transitions. [2021-11-02 22:45:26,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:45:26,037 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 11 states have internal predecessors, (45), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-11-02 22:45:26,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:26,038 INFO L225 Difference]: With dead ends: 72 [2021-11-02 22:45:26,038 INFO L226 Difference]: Without dead ends: 72 [2021-11-02 22:45:26,039 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:45:26,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-02 22:45:26,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 69. [2021-11-02 22:45:26,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 62 states have (on average 1.1612903225806452) internal successors, (72), 65 states have internal predecessors, (72), 2 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) [2021-11-02 22:45:26,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 75 transitions. [2021-11-02 22:45:26,059 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 75 transitions. Word has length 42 [2021-11-02 22:45:26,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:26,060 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 75 transitions. [2021-11-02 22:45:26,060 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 11 states have internal predecessors, (45), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:26,060 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 75 transitions. [2021-11-02 22:45:26,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-02 22:45:26,061 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:26,062 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:26,105 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:26,277 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-02 22:45:26,277 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting mainErr11ENSURES_VIOLATIONMEMORY_LEAK === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:26,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:26,278 INFO L85 PathProgramCache]: Analyzing trace with hash 1063093236, now seen corresponding path program 2 times [2021-11-02 22:45:26,278 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:26,278 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [708161122] [2021-11-02 22:45:26,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:26,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:26,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:26,429 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:26,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:26,433 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:26,434 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:26,434 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [708161122] [2021-11-02 22:45:26,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [708161122] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:26,434 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [450478577] [2021-11-02 22:45:26,434 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:45:26,437 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:26,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:26,439 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:26,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-02 22:45:26,557 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-02 22:45:26,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:26,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-02 22:45:26,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:26,883 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-02 22:45:26,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [450478577] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:45:26,883 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:45:26,883 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [12] total 15 [2021-11-02 22:45:26,884 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136303688] [2021-11-02 22:45:26,885 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:45:26,885 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:26,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:45:26,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=145, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:45:26,886 INFO L87 Difference]: Start difference. First operand 69 states and 75 transitions. Second operand has 5 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 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) [2021-11-02 22:45:26,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:26,915 INFO L93 Difference]: Finished difference Result 68 states and 74 transitions. [2021-11-02 22:45:26,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:45:26,915 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 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 46 [2021-11-02 22:45:26,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:26,916 INFO L225 Difference]: With dead ends: 68 [2021-11-02 22:45:26,917 INFO L226 Difference]: Without dead ends: 64 [2021-11-02 22:45:26,917 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=65, Invalid=145, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:45:26,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-02 22:45:26,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-11-02 22:45:26,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 58 states have (on average 1.1206896551724137) internal successors, (65), 60 states have internal predecessors, (65), 2 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) [2021-11-02 22:45:26,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2021-11-02 22:45:26,921 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 46 [2021-11-02 22:45:26,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:26,922 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2021-11-02 22:45:26,922 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 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) [2021-11-02 22:45:26,922 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2021-11-02 22:45:26,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-02 22:45:26,924 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:26,924 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:26,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:27,137 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-02 22:45:27,138 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:27,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:27,138 INFO L85 PathProgramCache]: Analyzing trace with hash -1362222989, now seen corresponding path program 4 times [2021-11-02 22:45:27,147 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:27,147 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918103552] [2021-11-02 22:45:27,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:27,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:27,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:27,275 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:27,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:27,286 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-02 22:45:27,287 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:27,287 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918103552] [2021-11-02 22:45:27,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1918103552] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:27,287 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [777530593] [2021-11-02 22:45:27,287 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:45:27,288 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:27,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:27,289 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:27,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-02 22:45:27,529 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:45:27,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:27,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-02 22:45:27,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:27,711 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-02 22:45:27,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [777530593] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:27,712 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:27,712 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-11-02 22:45:27,712 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75845466] [2021-11-02 22:45:27,714 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-02 22:45:27,714 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:27,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-02 22:45:27,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:45:27,716 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand has 13 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 12 states have internal predecessors, (47), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:27,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:27,796 INFO L93 Difference]: Finished difference Result 71 states and 75 transitions. [2021-11-02 22:45:27,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:45:27,797 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 12 states have internal predecessors, (47), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-11-02 22:45:27,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:27,798 INFO L225 Difference]: With dead ends: 71 [2021-11-02 22:45:27,799 INFO L226 Difference]: Without dead ends: 71 [2021-11-02 22:45:27,799 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:45:27,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-02 22:45:27,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2021-11-02 22:45:27,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 62 states have (on average 1.1129032258064515) internal successors, (69), 64 states have internal predecessors, (69), 2 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) [2021-11-02 22:45:27,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 72 transitions. [2021-11-02 22:45:27,808 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 72 transitions. Word has length 47 [2021-11-02 22:45:27,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:27,810 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 72 transitions. [2021-11-02 22:45:27,810 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 12 states have internal predecessors, (47), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:27,810 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 72 transitions. [2021-11-02 22:45:27,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-02 22:45:27,814 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:27,815 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:27,864 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:28,029 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-02 22:45:28,030 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:28,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:28,030 INFO L85 PathProgramCache]: Analyzing trace with hash 753232848, now seen corresponding path program 5 times [2021-11-02 22:45:28,030 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:28,031 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [23147302] [2021-11-02 22:45:28,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:28,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:28,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:28,173 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:28,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:28,178 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-02 22:45:28,179 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:28,179 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [23147302] [2021-11-02 22:45:28,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [23147302] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:28,179 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [756419800] [2021-11-02 22:45:28,180 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:45:28,180 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:28,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:28,182 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:28,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-02 22:45:28,420 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-02 22:45:28,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:28,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-02 22:45:28,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:28,620 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-02 22:45:28,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [756419800] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:28,621 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:28,621 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-11-02 22:45:28,621 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512304864] [2021-11-02 22:45:28,622 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-02 22:45:28,622 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:28,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-02 22:45:28,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:45:28,627 INFO L87 Difference]: Start difference. First operand 68 states and 72 transitions. Second operand has 14 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:28,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:28,707 INFO L93 Difference]: Finished difference Result 75 states and 79 transitions. [2021-11-02 22:45:28,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 22:45:28,708 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-11-02 22:45:28,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:28,709 INFO L225 Difference]: With dead ends: 75 [2021-11-02 22:45:28,709 INFO L226 Difference]: Without dead ends: 75 [2021-11-02 22:45:28,710 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:45:28,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-02 22:45:28,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2021-11-02 22:45:28,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 66 states have (on average 1.106060606060606) internal successors, (73), 68 states have internal predecessors, (73), 2 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) [2021-11-02 22:45:28,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 76 transitions. [2021-11-02 22:45:28,716 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 76 transitions. Word has length 51 [2021-11-02 22:45:28,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:28,716 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 76 transitions. [2021-11-02 22:45:28,717 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:28,717 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 76 transitions. [2021-11-02 22:45:28,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-02 22:45:28,719 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:28,719 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:28,762 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:28,939 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:28,940 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:28,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:28,940 INFO L85 PathProgramCache]: Analyzing trace with hash -310525779, now seen corresponding path program 6 times [2021-11-02 22:45:28,940 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:28,940 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450490688] [2021-11-02 22:45:28,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:28,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:28,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:29,125 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:29,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:29,131 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-02 22:45:29,131 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:29,131 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1450490688] [2021-11-02 22:45:29,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1450490688] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:29,132 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1606469848] [2021-11-02 22:45:29,132 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:45:29,132 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:29,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:29,133 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:29,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-02 22:45:29,382 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-02 22:45:29,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:29,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-02 22:45:29,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:29,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:45:29,946 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-02 22:45:29,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1606469848] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:29,947 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:29,947 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 6] total 19 [2021-11-02 22:45:29,947 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778608105] [2021-11-02 22:45:29,948 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-02 22:45:29,948 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:29,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-02 22:45:29,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=252, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:45:29,950 INFO L87 Difference]: Start difference. First operand 72 states and 76 transitions. Second operand has 19 states, 19 states have (on average 3.3684210526315788) internal successors, (64), 18 states have internal predecessors, (64), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:30,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:30,481 INFO L93 Difference]: Finished difference Result 88 states and 93 transitions. [2021-11-02 22:45:30,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-02 22:45:30,482 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.3684210526315788) internal successors, (64), 18 states have internal predecessors, (64), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-11-02 22:45:30,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:30,483 INFO L225 Difference]: With dead ends: 88 [2021-11-02 22:45:30,483 INFO L226 Difference]: Without dead ends: 88 [2021-11-02 22:45:30,484 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=262, Invalid=860, Unknown=0, NotChecked=0, Total=1122 [2021-11-02 22:45:30,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-02 22:45:30,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 83. [2021-11-02 22:45:30,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 77 states have (on average 1.103896103896104) internal successors, (85), 79 states have internal predecessors, (85), 2 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) [2021-11-02 22:45:30,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 88 transitions. [2021-11-02 22:45:30,488 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 88 transitions. Word has length 55 [2021-11-02 22:45:30,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:30,488 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 88 transitions. [2021-11-02 22:45:30,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.3684210526315788) internal successors, (64), 18 states have internal predecessors, (64), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:30,488 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 88 transitions. [2021-11-02 22:45:30,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-02 22:45:30,490 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:30,490 INFO L513 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:30,535 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:30,701 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-02 22:45:30,702 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:30,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:30,702 INFO L85 PathProgramCache]: Analyzing trace with hash -1854051309, now seen corresponding path program 7 times [2021-11-02 22:45:30,702 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:30,702 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1005068078] [2021-11-02 22:45:30,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:30,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:30,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:30,925 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:30,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:30,930 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-02 22:45:30,931 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:30,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1005068078] [2021-11-02 22:45:30,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1005068078] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:30,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990696492] [2021-11-02 22:45:30,931 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:45:30,931 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:30,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:30,934 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:30,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-02 22:45:31,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:31,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-02 22:45:31,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:31,426 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-02 22:45:31,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1990696492] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:31,426 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:31,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-11-02 22:45:31,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559805296] [2021-11-02 22:45:31,429 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-02 22:45:31,429 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:31,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-02 22:45:31,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:45:31,430 INFO L87 Difference]: Start difference. First operand 83 states and 88 transitions. Second operand has 16 states, 16 states have (on average 3.6875) internal successors, (59), 15 states have internal predecessors, (59), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:31,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:31,513 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2021-11-02 22:45:31,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-02 22:45:31,514 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.6875) internal successors, (59), 15 states have internal predecessors, (59), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-11-02 22:45:31,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:31,515 INFO L225 Difference]: With dead ends: 90 [2021-11-02 22:45:31,515 INFO L226 Difference]: Without dead ends: 90 [2021-11-02 22:45:31,517 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:45:31,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-02 22:45:31,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 87. [2021-11-02 22:45:31,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 81 states have (on average 1.0987654320987654) internal successors, (89), 83 states have internal predecessors, (89), 2 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) [2021-11-02 22:45:31,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 92 transitions. [2021-11-02 22:45:31,521 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 92 transitions. Word has length 62 [2021-11-02 22:45:31,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:31,521 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 92 transitions. [2021-11-02 22:45:31,522 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.6875) internal successors, (59), 15 states have internal predecessors, (59), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:31,522 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 92 transitions. [2021-11-02 22:45:31,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-02 22:45:31,523 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:31,523 INFO L513 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:31,559 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-11-02 22:45:31,737 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-02 22:45:31,738 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:31,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:31,738 INFO L85 PathProgramCache]: Analyzing trace with hash -259761386, now seen corresponding path program 8 times [2021-11-02 22:45:31,738 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:31,738 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777545525] [2021-11-02 22:45:31,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:31,739 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:31,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:31,962 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:31,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:31,967 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-02 22:45:31,968 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:31,968 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [777545525] [2021-11-02 22:45:31,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [777545525] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:31,968 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1530702089] [2021-11-02 22:45:31,969 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:45:31,969 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:31,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:31,970 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:31,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-02 22:45:32,296 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:45:32,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:32,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-02 22:45:32,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:32,525 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-02 22:45:32,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1530702089] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:32,526 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:32,526 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-11-02 22:45:32,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90648940] [2021-11-02 22:45:32,527 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-02 22:45:32,527 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:32,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-02 22:45:32,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:45:32,529 INFO L87 Difference]: Start difference. First operand 87 states and 92 transitions. Second operand has 17 states, 17 states have (on average 3.7058823529411766) internal successors, (63), 16 states have internal predecessors, (63), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:32,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:32,632 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2021-11-02 22:45:32,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-02 22:45:32,633 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.7058823529411766) internal successors, (63), 16 states have internal predecessors, (63), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 66 [2021-11-02 22:45:32,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:32,634 INFO L225 Difference]: With dead ends: 94 [2021-11-02 22:45:32,634 INFO L226 Difference]: Without dead ends: 94 [2021-11-02 22:45:32,635 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:45:32,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-02 22:45:32,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 91. [2021-11-02 22:45:32,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 85 states have (on average 1.0941176470588236) internal successors, (93), 87 states have internal predecessors, (93), 2 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) [2021-11-02 22:45:32,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 96 transitions. [2021-11-02 22:45:32,639 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 96 transitions. Word has length 66 [2021-11-02 22:45:32,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:32,640 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 96 transitions. [2021-11-02 22:45:32,640 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.7058823529411766) internal successors, (63), 16 states have internal predecessors, (63), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:32,640 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 96 transitions. [2021-11-02 22:45:32,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-02 22:45:32,641 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:32,641 INFO L513 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:32,691 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:32,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-02 22:45:32,858 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:32,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:32,858 INFO L85 PathProgramCache]: Analyzing trace with hash -2069491559, now seen corresponding path program 9 times [2021-11-02 22:45:32,858 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:32,858 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [326715215] [2021-11-02 22:45:32,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:32,859 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:32,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:33,071 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:33,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:33,079 INFO L134 CoverageAnalysis]: Checked inductivity of 337 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-02 22:45:33,079 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:33,080 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [326715215] [2021-11-02 22:45:33,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [326715215] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:33,080 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [685556955] [2021-11-02 22:45:33,080 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:45:33,080 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:33,081 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:33,082 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:33,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-02 22:45:33,414 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-02 22:45:33,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:33,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-02 22:45:33,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:33,439 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:45:34,003 INFO L134 CoverageAnalysis]: Checked inductivity of 337 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2021-11-02 22:45:34,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [685556955] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:34,004 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:34,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 8] total 24 [2021-11-02 22:45:34,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302348487] [2021-11-02 22:45:34,005 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-02 22:45:34,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:34,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-02 22:45:34,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=412, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:45:34,006 INFO L87 Difference]: Start difference. First operand 91 states and 96 transitions. Second operand has 24 states, 24 states have (on average 3.2916666666666665) internal successors, (79), 23 states have internal predecessors, (79), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:34,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:34,619 INFO L93 Difference]: Finished difference Result 107 states and 113 transitions. [2021-11-02 22:45:34,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-02 22:45:34,619 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.2916666666666665) internal successors, (79), 23 states have internal predecessors, (79), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 70 [2021-11-02 22:45:34,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:34,620 INFO L225 Difference]: With dead ends: 107 [2021-11-02 22:45:34,621 INFO L226 Difference]: Without dead ends: 107 [2021-11-02 22:45:34,622 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=424, Invalid=1468, Unknown=0, NotChecked=0, Total=1892 [2021-11-02 22:45:34,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-02 22:45:34,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 102. [2021-11-02 22:45:34,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 96 states have (on average 1.09375) internal successors, (105), 98 states have internal predecessors, (105), 2 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) [2021-11-02 22:45:34,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 108 transitions. [2021-11-02 22:45:34,625 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 108 transitions. Word has length 70 [2021-11-02 22:45:34,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:34,626 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 108 transitions. [2021-11-02 22:45:34,626 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 3.2916666666666665) internal successors, (79), 23 states have internal predecessors, (79), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:34,626 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 108 transitions. [2021-11-02 22:45:34,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-02 22:45:34,627 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:34,627 INFO L513 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:34,655 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:34,845 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-02 22:45:34,846 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:34,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:34,846 INFO L85 PathProgramCache]: Analyzing trace with hash -1965572799, now seen corresponding path program 10 times [2021-11-02 22:45:34,846 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:34,846 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117525948] [2021-11-02 22:45:34,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:34,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:34,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:35,083 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:35,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:35,088 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-02 22:45:35,088 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:35,088 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117525948] [2021-11-02 22:45:35,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [117525948] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:35,088 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965849806] [2021-11-02 22:45:35,089 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:45:35,089 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:35,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:35,094 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:35,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-02 22:45:35,575 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:45:35,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:35,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-02 22:45:35,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:35,875 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-02 22:45:35,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1965849806] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:35,876 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:35,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-11-02 22:45:35,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756276184] [2021-11-02 22:45:35,878 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-02 22:45:35,878 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:35,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-02 22:45:35,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:45:35,879 INFO L87 Difference]: Start difference. First operand 102 states and 108 transitions. Second operand has 19 states, 19 states have (on average 3.736842105263158) internal successors, (71), 18 states have internal predecessors, (71), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:35,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:35,977 INFO L93 Difference]: Finished difference Result 109 states and 115 transitions. [2021-11-02 22:45:35,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-02 22:45:35,978 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.736842105263158) internal successors, (71), 18 states have internal predecessors, (71), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-11-02 22:45:35,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:35,979 INFO L225 Difference]: With dead ends: 109 [2021-11-02 22:45:35,979 INFO L226 Difference]: Without dead ends: 109 [2021-11-02 22:45:35,980 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:45:35,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-02 22:45:35,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 106. [2021-11-02 22:45:35,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 100 states have (on average 1.09) internal successors, (109), 102 states have internal predecessors, (109), 2 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) [2021-11-02 22:45:35,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 112 transitions. [2021-11-02 22:45:35,984 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 112 transitions. Word has length 77 [2021-11-02 22:45:35,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:35,985 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 112 transitions. [2021-11-02 22:45:35,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.736842105263158) internal successors, (71), 18 states have internal predecessors, (71), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:35,985 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 112 transitions. [2021-11-02 22:45:35,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-02 22:45:35,986 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:35,987 INFO L513 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:36,032 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:36,201 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:36,202 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:36,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:36,202 INFO L85 PathProgramCache]: Analyzing trace with hash 1374324702, now seen corresponding path program 11 times [2021-11-02 22:45:36,202 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:36,202 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301313921] [2021-11-02 22:45:36,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:36,203 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:36,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:36,464 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:36,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:36,470 INFO L134 CoverageAnalysis]: Checked inductivity of 457 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-02 22:45:36,470 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:36,470 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301313921] [2021-11-02 22:45:36,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1301313921] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:36,471 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [488713762] [2021-11-02 22:45:36,471 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:45:36,471 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:36,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:36,474 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:36,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-02 22:45:37,014 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2021-11-02 22:45:37,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:37,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-02 22:45:37,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:37,322 INFO L134 CoverageAnalysis]: Checked inductivity of 457 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-02 22:45:37,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [488713762] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:37,322 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:37,322 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-11-02 22:45:37,322 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352442999] [2021-11-02 22:45:37,323 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-02 22:45:37,323 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:37,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-02 22:45:37,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:45:37,324 INFO L87 Difference]: Start difference. First operand 106 states and 112 transitions. Second operand has 20 states, 20 states have (on average 3.75) internal successors, (75), 19 states have internal predecessors, (75), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:37,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:37,416 INFO L93 Difference]: Finished difference Result 113 states and 119 transitions. [2021-11-02 22:45:37,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-02 22:45:37,417 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.75) internal successors, (75), 19 states have internal predecessors, (75), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2021-11-02 22:45:37,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:37,418 INFO L225 Difference]: With dead ends: 113 [2021-11-02 22:45:37,418 INFO L226 Difference]: Without dead ends: 113 [2021-11-02 22:45:37,419 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:45:37,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-02 22:45:37,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 110. [2021-11-02 22:45:37,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 104 states have (on average 1.0865384615384615) internal successors, (113), 106 states have internal predecessors, (113), 2 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) [2021-11-02 22:45:37,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 116 transitions. [2021-11-02 22:45:37,423 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 116 transitions. Word has length 81 [2021-11-02 22:45:37,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:37,423 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 116 transitions. [2021-11-02 22:45:37,424 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.75) internal successors, (75), 19 states have internal predecessors, (75), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:37,424 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 116 transitions. [2021-11-02 22:45:37,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-02 22:45:37,425 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:37,425 INFO L513 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:37,460 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:37,649 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:37,650 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:37,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:37,650 INFO L85 PathProgramCache]: Analyzing trace with hash 1730984955, now seen corresponding path program 12 times [2021-11-02 22:45:37,650 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:37,651 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575904321] [2021-11-02 22:45:37,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:37,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:37,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:37,918 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:37,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:37,923 INFO L134 CoverageAnalysis]: Checked inductivity of 518 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-02 22:45:37,923 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:37,923 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575904321] [2021-11-02 22:45:37,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1575904321] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:37,924 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1480332384] [2021-11-02 22:45:37,924 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:45:37,924 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:37,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:37,926 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:37,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-02 22:45:38,472 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-11-02 22:45:38,472 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:38,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-02 22:45:38,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:38,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:45:39,438 INFO L134 CoverageAnalysis]: Checked inductivity of 518 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2021-11-02 22:45:39,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1480332384] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:39,438 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:39,438 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 9] total 28 [2021-11-02 22:45:39,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552381166] [2021-11-02 22:45:39,439 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-02 22:45:39,439 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:39,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-02 22:45:39,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=560, Unknown=0, NotChecked=0, Total=756 [2021-11-02 22:45:39,441 INFO L87 Difference]: Start difference. First operand 110 states and 116 transitions. Second operand has 28 states, 28 states have (on average 3.357142857142857) internal successors, (94), 27 states have internal predecessors, (94), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:40,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:40,170 INFO L93 Difference]: Finished difference Result 126 states and 133 transitions. [2021-11-02 22:45:40,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-02 22:45:40,173 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.357142857142857) internal successors, (94), 27 states have internal predecessors, (94), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2021-11-02 22:45:40,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:40,175 INFO L225 Difference]: With dead ends: 126 [2021-11-02 22:45:40,175 INFO L226 Difference]: Without dead ends: 126 [2021-11-02 22:45:40,176 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 446 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=597, Invalid=2055, Unknown=0, NotChecked=0, Total=2652 [2021-11-02 22:45:40,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-02 22:45:40,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 121. [2021-11-02 22:45:40,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 115 states have (on average 1.0869565217391304) internal successors, (125), 117 states have internal predecessors, (125), 2 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) [2021-11-02 22:45:40,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 128 transitions. [2021-11-02 22:45:40,181 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 128 transitions. Word has length 85 [2021-11-02 22:45:40,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:40,182 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 128 transitions. [2021-11-02 22:45:40,182 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 3.357142857142857) internal successors, (94), 27 states have internal predecessors, (94), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:40,182 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 128 transitions. [2021-11-02 22:45:40,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-02 22:45:40,183 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:40,183 INFO L513 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:40,230 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:40,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:40,398 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:40,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:40,398 INFO L85 PathProgramCache]: Analyzing trace with hash -320569659, now seen corresponding path program 13 times [2021-11-02 22:45:40,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:40,398 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1046119125] [2021-11-02 22:45:40,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:40,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:40,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:40,700 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:40,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:40,705 INFO L134 CoverageAnalysis]: Checked inductivity of 596 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-02 22:45:40,705 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:40,705 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1046119125] [2021-11-02 22:45:40,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1046119125] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:40,706 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [136154098] [2021-11-02 22:45:40,706 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:45:40,706 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:40,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:40,707 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:40,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-02 22:45:41,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:41,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-02 22:45:41,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:41,534 INFO L134 CoverageAnalysis]: Checked inductivity of 596 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-02 22:45:41,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [136154098] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:41,535 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:41,535 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-11-02 22:45:41,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049664429] [2021-11-02 22:45:41,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-02 22:45:41,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:41,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-02 22:45:41,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-11-02 22:45:41,537 INFO L87 Difference]: Start difference. First operand 121 states and 128 transitions. Second operand has 22 states, 22 states have (on average 3.772727272727273) internal successors, (83), 21 states have internal predecessors, (83), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:41,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:41,649 INFO L93 Difference]: Finished difference Result 128 states and 135 transitions. [2021-11-02 22:45:41,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-02 22:45:41,650 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.772727272727273) internal successors, (83), 21 states have internal predecessors, (83), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 92 [2021-11-02 22:45:41,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:41,651 INFO L225 Difference]: With dead ends: 128 [2021-11-02 22:45:41,651 INFO L226 Difference]: Without dead ends: 128 [2021-11-02 22:45:41,652 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-11-02 22:45:41,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-02 22:45:41,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 125. [2021-11-02 22:45:41,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 119 states have (on average 1.084033613445378) internal successors, (129), 121 states have internal predecessors, (129), 2 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) [2021-11-02 22:45:41,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 132 transitions. [2021-11-02 22:45:41,656 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 132 transitions. Word has length 92 [2021-11-02 22:45:41,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:41,657 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 132 transitions. [2021-11-02 22:45:41,657 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.772727272727273) internal successors, (83), 21 states have internal predecessors, (83), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:41,657 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 132 transitions. [2021-11-02 22:45:41,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-02 22:45:41,658 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:41,658 INFO L513 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:41,703 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:41,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-02 22:45:41,878 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:41,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:41,878 INFO L85 PathProgramCache]: Analyzing trace with hash 1327072904, now seen corresponding path program 14 times [2021-11-02 22:45:41,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:41,878 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156998893] [2021-11-02 22:45:41,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:41,879 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:41,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:42,188 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:42,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:42,192 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-02 22:45:42,193 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:42,193 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156998893] [2021-11-02 22:45:42,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1156998893] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:42,193 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2095431852] [2021-11-02 22:45:42,193 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:45:42,193 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:42,193 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:42,202 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:42,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-02 22:45:42,694 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:45:42,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:42,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-02 22:45:42,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:43,077 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-02 22:45:43,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2095431852] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:43,077 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:43,078 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-11-02 22:45:43,078 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781038645] [2021-11-02 22:45:43,079 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-02 22:45:43,079 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:43,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-02 22:45:43,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:45:43,081 INFO L87 Difference]: Start difference. First operand 125 states and 132 transitions. Second operand has 23 states, 23 states have (on average 3.782608695652174) internal successors, (87), 22 states have internal predecessors, (87), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:43,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:43,195 INFO L93 Difference]: Finished difference Result 132 states and 139 transitions. [2021-11-02 22:45:43,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-02 22:45:43,195 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.782608695652174) internal successors, (87), 22 states have internal predecessors, (87), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 96 [2021-11-02 22:45:43,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:43,196 INFO L225 Difference]: With dead ends: 132 [2021-11-02 22:45:43,196 INFO L226 Difference]: Without dead ends: 132 [2021-11-02 22:45:43,197 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:45:43,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-02 22:45:43,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 129. [2021-11-02 22:45:43,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 123 states have (on average 1.08130081300813) internal successors, (133), 125 states have internal predecessors, (133), 2 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) [2021-11-02 22:45:43,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 136 transitions. [2021-11-02 22:45:43,201 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 136 transitions. Word has length 96 [2021-11-02 22:45:43,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:43,202 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 136 transitions. [2021-11-02 22:45:43,202 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.782608695652174) internal successors, (87), 22 states have internal predecessors, (87), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:43,202 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 136 transitions. [2021-11-02 22:45:43,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-02 22:45:43,204 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:43,204 INFO L513 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:43,236 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:43,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:43,418 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:43,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:43,418 INFO L85 PathProgramCache]: Analyzing trace with hash -64031541, now seen corresponding path program 15 times [2021-11-02 22:45:43,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:43,418 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1287838588] [2021-11-02 22:45:43,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:43,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:43,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:43,809 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:43,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:43,814 INFO L134 CoverageAnalysis]: Checked inductivity of 738 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-02 22:45:43,814 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:43,814 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1287838588] [2021-11-02 22:45:43,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1287838588] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:43,814 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77420293] [2021-11-02 22:45:43,815 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:45:43,815 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:43,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:43,817 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:43,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-02 22:45:44,316 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-02 22:45:44,316 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:44,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-02 22:45:44,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:44,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:45:45,184 INFO L134 CoverageAnalysis]: Checked inductivity of 738 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2021-11-02 22:45:45,184 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77420293] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:45,184 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:45,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 10] total 32 [2021-11-02 22:45:45,185 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807669447] [2021-11-02 22:45:45,185 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-02 22:45:45,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:45,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-02 22:45:45,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=730, Unknown=0, NotChecked=0, Total=992 [2021-11-02 22:45:45,187 INFO L87 Difference]: Start difference. First operand 129 states and 136 transitions. Second operand has 32 states, 32 states have (on average 3.40625) internal successors, (109), 31 states have internal predecessors, (109), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:46,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:46,085 INFO L93 Difference]: Finished difference Result 145 states and 153 transitions. [2021-11-02 22:45:46,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-02 22:45:46,086 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.40625) internal successors, (109), 31 states have internal predecessors, (109), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 100 [2021-11-02 22:45:46,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:46,087 INFO L225 Difference]: With dead ends: 145 [2021-11-02 22:45:46,087 INFO L226 Difference]: Without dead ends: 145 [2021-11-02 22:45:46,089 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 600 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=800, Invalid=2740, Unknown=0, NotChecked=0, Total=3540 [2021-11-02 22:45:46,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-11-02 22:45:46,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 140. [2021-11-02 22:45:46,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 134 states have (on average 1.0820895522388059) internal successors, (145), 136 states have internal predecessors, (145), 2 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) [2021-11-02 22:45:46,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 148 transitions. [2021-11-02 22:45:46,094 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 148 transitions. Word has length 100 [2021-11-02 22:45:46,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:46,095 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 148 transitions. [2021-11-02 22:45:46,095 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 3.40625) internal successors, (109), 31 states have internal predecessors, (109), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:46,095 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 148 transitions. [2021-11-02 22:45:46,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-02 22:45:46,097 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:46,097 INFO L513 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:46,142 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:46,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:46,298 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:46,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:46,298 INFO L85 PathProgramCache]: Analyzing trace with hash 786039567, now seen corresponding path program 16 times [2021-11-02 22:45:46,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:46,298 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114455449] [2021-11-02 22:45:46,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:46,299 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:46,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:46,688 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:46,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:46,693 INFO L134 CoverageAnalysis]: Checked inductivity of 831 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-02 22:45:46,693 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:46,693 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114455449] [2021-11-02 22:45:46,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1114455449] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:46,693 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1268917228] [2021-11-02 22:45:46,693 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:45:46,694 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:46,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:46,695 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:46,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-02 22:45:47,654 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:45:47,654 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:47,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-02 22:45:47,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:47,967 INFO L134 CoverageAnalysis]: Checked inductivity of 831 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-02 22:45:47,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1268917228] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:47,967 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:47,967 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-11-02 22:45:47,967 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807583691] [2021-11-02 22:45:47,968 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-02 22:45:47,968 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:47,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-02 22:45:47,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2021-11-02 22:45:47,969 INFO L87 Difference]: Start difference. First operand 140 states and 148 transitions. Second operand has 25 states, 25 states have (on average 3.8) internal successors, (95), 24 states have internal predecessors, (95), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:48,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:48,071 INFO L93 Difference]: Finished difference Result 147 states and 155 transitions. [2021-11-02 22:45:48,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-02 22:45:48,071 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.8) internal successors, (95), 24 states have internal predecessors, (95), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2021-11-02 22:45:48,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:48,072 INFO L225 Difference]: With dead ends: 147 [2021-11-02 22:45:48,072 INFO L226 Difference]: Without dead ends: 147 [2021-11-02 22:45:48,073 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2021-11-02 22:45:48,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-02 22:45:48,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 144. [2021-11-02 22:45:48,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 138 states have (on average 1.0797101449275361) internal successors, (149), 140 states have internal predecessors, (149), 2 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) [2021-11-02 22:45:48,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 152 transitions. [2021-11-02 22:45:48,078 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 152 transitions. Word has length 107 [2021-11-02 22:45:48,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:48,079 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 152 transitions. [2021-11-02 22:45:48,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.8) internal successors, (95), 24 states have internal predecessors, (95), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:48,079 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 152 transitions. [2021-11-02 22:45:48,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-02 22:45:48,081 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:48,081 INFO L513 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:48,115 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2021-11-02 22:45:48,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-02 22:45:48,302 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:48,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:48,302 INFO L85 PathProgramCache]: Analyzing trace with hash 1261575404, now seen corresponding path program 17 times [2021-11-02 22:45:48,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:48,303 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631794940] [2021-11-02 22:45:48,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:48,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:48,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:48,677 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:48,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:48,682 INFO L134 CoverageAnalysis]: Checked inductivity of 912 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-02 22:45:48,682 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:48,682 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631794940] [2021-11-02 22:45:48,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1631794940] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:48,683 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [546438346] [2021-11-02 22:45:48,683 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:45:48,683 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:48,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:48,686 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:48,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-02 22:45:49,844 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2021-11-02 22:45:49,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:49,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-02 22:45:49,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:50,198 INFO L134 CoverageAnalysis]: Checked inductivity of 912 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-02 22:45:50,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [546438346] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:50,198 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:50,199 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-11-02 22:45:50,199 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435654821] [2021-11-02 22:45:50,199 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-02 22:45:50,199 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:50,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-02 22:45:50,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2021-11-02 22:45:50,201 INFO L87 Difference]: Start difference. First operand 144 states and 152 transitions. Second operand has 26 states, 26 states have (on average 3.8076923076923075) internal successors, (99), 25 states have internal predecessors, (99), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:50,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:50,310 INFO L93 Difference]: Finished difference Result 151 states and 159 transitions. [2021-11-02 22:45:50,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-02 22:45:50,311 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.8076923076923075) internal successors, (99), 25 states have internal predecessors, (99), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 111 [2021-11-02 22:45:50,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:50,312 INFO L225 Difference]: With dead ends: 151 [2021-11-02 22:45:50,312 INFO L226 Difference]: Without dead ends: 151 [2021-11-02 22:45:50,313 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2021-11-02 22:45:50,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-11-02 22:45:50,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 148. [2021-11-02 22:45:50,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 142 states have (on average 1.0774647887323943) internal successors, (153), 144 states have internal predecessors, (153), 2 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) [2021-11-02 22:45:50,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 156 transitions. [2021-11-02 22:45:50,326 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 156 transitions. Word has length 111 [2021-11-02 22:45:50,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:50,326 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 156 transitions. [2021-11-02 22:45:50,326 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.8076923076923075) internal successors, (99), 25 states have internal predecessors, (99), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:50,326 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 156 transitions. [2021-11-02 22:45:50,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-02 22:45:50,328 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:50,328 INFO L513 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:50,370 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:50,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-02 22:45:50,554 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:50,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:50,554 INFO L85 PathProgramCache]: Analyzing trace with hash -402653111, now seen corresponding path program 18 times [2021-11-02 22:45:50,554 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:50,554 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71458559] [2021-11-02 22:45:50,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:50,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:50,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:50,950 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:50,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:50,955 INFO L134 CoverageAnalysis]: Checked inductivity of 997 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-02 22:45:50,955 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:50,956 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [71458559] [2021-11-02 22:45:50,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [71458559] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:50,956 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [348159466] [2021-11-02 22:45:50,956 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:45:50,957 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:50,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:50,961 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:50,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-02 22:45:51,911 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-11-02 22:45:51,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:51,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-02 22:45:51,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:51,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:45:52,971 INFO L134 CoverageAnalysis]: Checked inductivity of 997 backedges. 85 proven. 51 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2021-11-02 22:45:52,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [348159466] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:52,972 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:52,972 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 13] total 38 [2021-11-02 22:45:52,972 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170948423] [2021-11-02 22:45:52,972 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-02 22:45:52,973 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:52,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-02 22:45:52,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=1061, Unknown=0, NotChecked=0, Total=1406 [2021-11-02 22:45:52,974 INFO L87 Difference]: Start difference. First operand 148 states and 156 transitions. Second operand has 38 states, 38 states have (on average 3.3684210526315788) internal successors, (128), 37 states have internal predecessors, (128), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:54,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:54,287 INFO L93 Difference]: Finished difference Result 165 states and 174 transitions. [2021-11-02 22:45:54,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-02 22:45:54,287 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.3684210526315788) internal successors, (128), 37 states have internal predecessors, (128), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 115 [2021-11-02 22:45:54,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:54,289 INFO L225 Difference]: With dead ends: 165 [2021-11-02 22:45:54,289 INFO L226 Difference]: Without dead ends: 165 [2021-11-02 22:45:54,291 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 847 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1095, Invalid=3735, Unknown=0, NotChecked=0, Total=4830 [2021-11-02 22:45:54,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-11-02 22:45:54,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 163. [2021-11-02 22:45:54,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 157 states have (on average 1.0764331210191083) internal successors, (169), 159 states have internal predecessors, (169), 2 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) [2021-11-02 22:45:54,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 172 transitions. [2021-11-02 22:45:54,297 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 172 transitions. Word has length 115 [2021-11-02 22:45:54,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:54,310 INFO L470 AbstractCegarLoop]: Abstraction has 163 states and 172 transitions. [2021-11-02 22:45:54,311 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.3684210526315788) internal successors, (128), 37 states have internal predecessors, (128), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:54,311 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 172 transitions. [2021-11-02 22:45:54,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-02 22:45:54,313 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:54,314 INFO L513 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:54,344 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-11-02 22:45:54,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-02 22:45:54,526 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:54,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:54,528 INFO L85 PathProgramCache]: Analyzing trace with hash -192272134, now seen corresponding path program 19 times [2021-11-02 22:45:54,528 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:54,529 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190254549] [2021-11-02 22:45:54,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:54,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:54,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:54,941 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:54,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:54,952 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-02 22:45:54,953 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:54,953 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1190254549] [2021-11-02 22:45:54,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1190254549] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:54,954 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [137099371] [2021-11-02 22:45:54,954 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:45:54,954 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:54,954 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:54,955 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:54,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-02 22:45:55,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:55,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-02 22:45:55,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:56,134 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-02 22:45:56,134 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [137099371] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:56,134 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:56,134 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-11-02 22:45:56,135 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670232565] [2021-11-02 22:45:56,135 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-02 22:45:56,135 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:56,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-02 22:45:56,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2021-11-02 22:45:56,136 INFO L87 Difference]: Start difference. First operand 163 states and 172 transitions. Second operand has 29 states, 29 states have (on average 3.8275862068965516) internal successors, (111), 28 states have internal predecessors, (111), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:56,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:56,271 INFO L93 Difference]: Finished difference Result 170 states and 179 transitions. [2021-11-02 22:45:56,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-02 22:45:56,271 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.8275862068965516) internal successors, (111), 28 states have internal predecessors, (111), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 126 [2021-11-02 22:45:56,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:56,273 INFO L225 Difference]: With dead ends: 170 [2021-11-02 22:45:56,273 INFO L226 Difference]: Without dead ends: 170 [2021-11-02 22:45:56,273 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2021-11-02 22:45:56,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-02 22:45:56,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 167. [2021-11-02 22:45:56,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 161 states have (on average 1.0745341614906831) internal successors, (173), 163 states have internal predecessors, (173), 2 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) [2021-11-02 22:45:56,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 176 transitions. [2021-11-02 22:45:56,280 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 176 transitions. Word has length 126 [2021-11-02 22:45:56,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:56,280 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 176 transitions. [2021-11-02 22:45:56,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 3.8275862068965516) internal successors, (111), 28 states have internal predecessors, (111), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:56,281 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 176 transitions. [2021-11-02 22:45:56,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-02 22:45:56,283 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:56,283 INFO L513 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:56,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-02 22:45:56,497 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-02 22:45:56,498 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:56,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:56,498 INFO L85 PathProgramCache]: Analyzing trace with hash -841515011, now seen corresponding path program 20 times [2021-11-02 22:45:56,498 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:56,498 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866102820] [2021-11-02 22:45:56,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:56,499 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:56,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:57,001 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:57,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:57,007 INFO L134 CoverageAnalysis]: Checked inductivity of 1295 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-02 22:45:57,008 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:57,008 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866102820] [2021-11-02 22:45:57,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [866102820] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:57,008 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [292689493] [2021-11-02 22:45:57,008 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:45:57,009 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:57,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:57,010 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:57,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-02 22:45:57,815 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:45:57,815 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:57,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-02 22:45:57,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:45:58,201 INFO L134 CoverageAnalysis]: Checked inductivity of 1295 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-02 22:45:58,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [292689493] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:58,202 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:58,202 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-11-02 22:45:58,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227874267] [2021-11-02 22:45:58,202 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-02 22:45:58,203 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:58,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-02 22:45:58,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2021-11-02 22:45:58,204 INFO L87 Difference]: Start difference. First operand 167 states and 176 transitions. Second operand has 30 states, 30 states have (on average 3.8333333333333335) internal successors, (115), 29 states have internal predecessors, (115), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:58,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:45:58,354 INFO L93 Difference]: Finished difference Result 174 states and 183 transitions. [2021-11-02 22:45:58,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-02 22:45:58,354 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.8333333333333335) internal successors, (115), 29 states have internal predecessors, (115), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 130 [2021-11-02 22:45:58,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:45:58,355 INFO L225 Difference]: With dead ends: 174 [2021-11-02 22:45:58,356 INFO L226 Difference]: Without dead ends: 174 [2021-11-02 22:45:58,356 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2021-11-02 22:45:58,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-11-02 22:45:58,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 171. [2021-11-02 22:45:58,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 165 states have (on average 1.0727272727272728) internal successors, (177), 167 states have internal predecessors, (177), 2 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) [2021-11-02 22:45:58,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 180 transitions. [2021-11-02 22:45:58,362 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 180 transitions. Word has length 130 [2021-11-02 22:45:58,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:45:58,362 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 180 transitions. [2021-11-02 22:45:58,363 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 3.8333333333333335) internal successors, (115), 29 states have internal predecessors, (115), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:45:58,363 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 180 transitions. [2021-11-02 22:45:58,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-02 22:45:58,365 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:45:58,365 INFO L513 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:45:58,414 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2021-11-02 22:45:58,581 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-02 22:45:58,582 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:45:58,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:45:58,582 INFO L85 PathProgramCache]: Analyzing trace with hash 46898560, now seen corresponding path program 21 times [2021-11-02 22:45:58,582 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:45:58,582 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1212887657] [2021-11-02 22:45:58,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:45:58,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:45:58,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:59,104 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:45:59,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:45:59,109 INFO L134 CoverageAnalysis]: Checked inductivity of 1396 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-02 22:45:59,110 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:45:59,110 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1212887657] [2021-11-02 22:45:59,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1212887657] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:59,110 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1954237076] [2021-11-02 22:45:59,111 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:45:59,111 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:45:59,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:45:59,130 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:45:59,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-02 22:45:59,994 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-02 22:45:59,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:45:59,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-02 22:45:59,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:46:00,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:46:01,310 INFO L134 CoverageAnalysis]: Checked inductivity of 1396 backedges. 101 proven. 70 refuted. 0 times theorem prover too weak. 1225 trivial. 0 not checked. [2021-11-02 22:46:01,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1954237076] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:01,311 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:46:01,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 14] total 43 [2021-11-02 22:46:01,312 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907879259] [2021-11-02 22:46:01,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-02 22:46:01,313 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:46:01,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-02 22:46:01,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=459, Invalid=1347, Unknown=0, NotChecked=0, Total=1806 [2021-11-02 22:46:01,315 INFO L87 Difference]: Start difference. First operand 171 states and 180 transitions. Second operand has 43 states, 43 states have (on average 3.4186046511627906) internal successors, (147), 42 states have internal predecessors, (147), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:02,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:46:02,718 INFO L93 Difference]: Finished difference Result 188 states and 198 transitions. [2021-11-02 22:46:02,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-02 22:46:02,718 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.4186046511627906) internal successors, (147), 42 states have internal predecessors, (147), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 134 [2021-11-02 22:46:02,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:46:02,719 INFO L225 Difference]: With dead ends: 188 [2021-11-02 22:46:02,720 INFO L226 Difference]: Without dead ends: 188 [2021-11-02 22:46:02,722 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1105 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1451, Invalid=4869, Unknown=0, NotChecked=0, Total=6320 [2021-11-02 22:46:02,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-11-02 22:46:02,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 186. [2021-11-02 22:46:02,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 180 states have (on average 1.0722222222222222) internal successors, (193), 182 states have internal predecessors, (193), 2 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) [2021-11-02 22:46:02,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 196 transitions. [2021-11-02 22:46:02,728 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 196 transitions. Word has length 134 [2021-11-02 22:46:02,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:46:02,729 INFO L470 AbstractCegarLoop]: Abstraction has 186 states and 196 transitions. [2021-11-02 22:46:02,729 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 3.4186046511627906) internal successors, (147), 42 states have internal predecessors, (147), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:02,730 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 196 transitions. [2021-11-02 22:46:02,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-02 22:46:02,731 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:46:02,732 INFO L513 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:46:02,761 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-11-02 22:46:02,941 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:02,942 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:46:02,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:46:02,942 INFO L85 PathProgramCache]: Analyzing trace with hash 33009047, now seen corresponding path program 22 times [2021-11-02 22:46:02,942 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:46:02,942 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [599912136] [2021-11-02 22:46:02,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:46:02,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:46:02,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:03,449 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:46:03,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:03,464 INFO L134 CoverageAnalysis]: Checked inductivity of 1632 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-02 22:46:03,465 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:46:03,465 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [599912136] [2021-11-02 22:46:03,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [599912136] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:03,465 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1210254502] [2021-11-02 22:46:03,466 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:46:03,466 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:03,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:46:03,482 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:46:03,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-02 22:46:05,025 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:46:05,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:46:05,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 488 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-02 22:46:05,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:46:05,503 INFO L134 CoverageAnalysis]: Checked inductivity of 1632 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-02 22:46:05,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1210254502] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:05,504 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:46:05,504 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2021-11-02 22:46:05,504 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336598466] [2021-11-02 22:46:05,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-02 22:46:05,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:46:05,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-02 22:46:05,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2021-11-02 22:46:05,507 INFO L87 Difference]: Start difference. First operand 186 states and 196 transitions. Second operand has 33 states, 33 states have (on average 3.8484848484848486) internal successors, (127), 32 states have internal predecessors, (127), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:05,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:46:05,646 INFO L93 Difference]: Finished difference Result 193 states and 203 transitions. [2021-11-02 22:46:05,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-02 22:46:05,647 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.8484848484848486) internal successors, (127), 32 states have internal predecessors, (127), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 145 [2021-11-02 22:46:05,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:46:05,648 INFO L225 Difference]: With dead ends: 193 [2021-11-02 22:46:05,648 INFO L226 Difference]: Without dead ends: 193 [2021-11-02 22:46:05,649 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2021-11-02 22:46:05,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-11-02 22:46:05,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 190. [2021-11-02 22:46:05,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 184 states have (on average 1.0706521739130435) internal successors, (197), 186 states have internal predecessors, (197), 2 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) [2021-11-02 22:46:05,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 200 transitions. [2021-11-02 22:46:05,655 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 200 transitions. Word has length 145 [2021-11-02 22:46:05,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:46:05,656 INFO L470 AbstractCegarLoop]: Abstraction has 190 states and 200 transitions. [2021-11-02 22:46:05,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 3.8484848484848486) internal successors, (127), 32 states have internal predecessors, (127), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:05,657 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 200 transitions. [2021-11-02 22:46:05,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-02 22:46:05,659 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:46:05,659 INFO L513 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:46:05,707 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-02 22:46:05,881 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-02 22:46:05,882 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:46:05,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:46:05,882 INFO L85 PathProgramCache]: Analyzing trace with hash -1169524300, now seen corresponding path program 23 times [2021-11-02 22:46:05,882 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:46:05,882 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [691244974] [2021-11-02 22:46:05,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:46:05,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:46:05,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:06,454 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:46:06,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:06,473 INFO L134 CoverageAnalysis]: Checked inductivity of 1745 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-02 22:46:06,473 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:46:06,473 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [691244974] [2021-11-02 22:46:06,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [691244974] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:06,473 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [3505506] [2021-11-02 22:46:06,473 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:46:06,473 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:06,474 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:46:06,490 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:46:06,509 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-02 22:46:08,264 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2021-11-02 22:46:08,265 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:46:08,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-02 22:46:08,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:46:08,758 INFO L134 CoverageAnalysis]: Checked inductivity of 1745 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-02 22:46:08,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [3505506] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:08,758 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:46:08,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-11-02 22:46:08,758 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472181127] [2021-11-02 22:46:08,759 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-02 22:46:08,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:46:08,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-02 22:46:08,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2021-11-02 22:46:08,761 INFO L87 Difference]: Start difference. First operand 190 states and 200 transitions. Second operand has 34 states, 34 states have (on average 3.8529411764705883) internal successors, (131), 33 states have internal predecessors, (131), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:08,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:46:08,903 INFO L93 Difference]: Finished difference Result 197 states and 207 transitions. [2021-11-02 22:46:08,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-02 22:46:08,903 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.8529411764705883) internal successors, (131), 33 states have internal predecessors, (131), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 149 [2021-11-02 22:46:08,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:46:08,904 INFO L225 Difference]: With dead ends: 197 [2021-11-02 22:46:08,905 INFO L226 Difference]: Without dead ends: 197 [2021-11-02 22:46:08,905 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2021-11-02 22:46:08,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-11-02 22:46:08,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 194. [2021-11-02 22:46:08,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 188 states have (on average 1.0691489361702127) internal successors, (201), 190 states have internal predecessors, (201), 2 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) [2021-11-02 22:46:08,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 204 transitions. [2021-11-02 22:46:08,912 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 204 transitions. Word has length 149 [2021-11-02 22:46:08,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:46:08,912 INFO L470 AbstractCegarLoop]: Abstraction has 194 states and 204 transitions. [2021-11-02 22:46:08,913 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 3.8529411764705883) internal successors, (131), 33 states have internal predecessors, (131), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:08,913 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 204 transitions. [2021-11-02 22:46:08,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-11-02 22:46:08,914 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:46:08,914 INFO L513 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:46:08,954 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-02 22:46:09,133 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-02 22:46:09,134 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:46:09,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:46:09,134 INFO L85 PathProgramCache]: Analyzing trace with hash 904916817, now seen corresponding path program 24 times [2021-11-02 22:46:09,134 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:46:09,135 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024507269] [2021-11-02 22:46:09,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:46:09,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:46:09,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:09,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:46:09,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:09,819 INFO L134 CoverageAnalysis]: Checked inductivity of 1862 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-02 22:46:09,820 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:46:09,820 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024507269] [2021-11-02 22:46:09,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1024507269] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:09,820 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1486920080] [2021-11-02 22:46:09,820 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:46:09,820 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:09,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:46:09,822 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:46:09,837 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-02 22:46:11,473 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 17 check-sat command(s) [2021-11-02 22:46:11,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:46:11,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-02 22:46:11,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:46:11,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:46:12,978 INFO L134 CoverageAnalysis]: Checked inductivity of 1862 backedges. 117 proven. 92 refuted. 0 times theorem prover too weak. 1653 trivial. 0 not checked. [2021-11-02 22:46:12,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1486920080] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:12,979 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:46:12,979 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 15] total 48 [2021-11-02 22:46:12,979 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210609388] [2021-11-02 22:46:12,980 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-02 22:46:12,980 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:46:12,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-02 22:46:12,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=590, Invalid=1666, Unknown=0, NotChecked=0, Total=2256 [2021-11-02 22:46:12,981 INFO L87 Difference]: Start difference. First operand 194 states and 204 transitions. Second operand has 48 states, 48 states have (on average 3.4583333333333335) internal successors, (166), 47 states have internal predecessors, (166), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:14,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:46:14,917 INFO L93 Difference]: Finished difference Result 211 states and 222 transitions. [2021-11-02 22:46:14,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-02 22:46:14,918 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.4583333333333335) internal successors, (166), 47 states have internal predecessors, (166), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 153 [2021-11-02 22:46:14,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:46:14,920 INFO L225 Difference]: With dead ends: 211 [2021-11-02 22:46:14,920 INFO L226 Difference]: Without dead ends: 211 [2021-11-02 22:46:14,923 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1396 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1858, Invalid=6152, Unknown=0, NotChecked=0, Total=8010 [2021-11-02 22:46:14,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-11-02 22:46:14,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 209. [2021-11-02 22:46:14,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 203 states have (on average 1.0689655172413792) internal successors, (217), 205 states have internal predecessors, (217), 2 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) [2021-11-02 22:46:14,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 220 transitions. [2021-11-02 22:46:14,931 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 220 transitions. Word has length 153 [2021-11-02 22:46:14,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:46:14,932 INFO L470 AbstractCegarLoop]: Abstraction has 209 states and 220 transitions. [2021-11-02 22:46:14,932 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 3.4583333333333335) internal successors, (166), 47 states have internal predecessors, (166), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:14,932 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 220 transitions. [2021-11-02 22:46:14,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-02 22:46:14,933 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:46:14,934 INFO L513 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:46:14,985 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-02 22:46:15,149 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:15,150 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:46:15,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:46:15,150 INFO L85 PathProgramCache]: Analyzing trace with hash -1886295950, now seen corresponding path program 25 times [2021-11-02 22:46:15,150 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:46:15,150 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [870165698] [2021-11-02 22:46:15,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:46:15,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:46:15,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:15,916 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:46:15,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:15,922 INFO L134 CoverageAnalysis]: Checked inductivity of 2133 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-11-02 22:46:15,923 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:46:15,923 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [870165698] [2021-11-02 22:46:15,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [870165698] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:15,923 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1523002344] [2021-11-02 22:46:15,923 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:46:15,925 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:15,925 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:46:15,930 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:46:15,941 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-02 22:46:17,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:17,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 549 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-02 22:46:17,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:46:17,785 INFO L134 CoverageAnalysis]: Checked inductivity of 2133 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-11-02 22:46:17,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1523002344] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:17,785 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:46:17,785 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-11-02 22:46:17,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [342817706] [2021-11-02 22:46:17,786 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-02 22:46:17,786 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:46:17,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-02 22:46:17,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2021-11-02 22:46:17,788 INFO L87 Difference]: Start difference. First operand 209 states and 220 transitions. Second operand has 37 states, 37 states have (on average 3.864864864864865) internal successors, (143), 36 states have internal predecessors, (143), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:17,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:46:17,945 INFO L93 Difference]: Finished difference Result 216 states and 227 transitions. [2021-11-02 22:46:17,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-02 22:46:17,946 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.864864864864865) internal successors, (143), 36 states have internal predecessors, (143), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 164 [2021-11-02 22:46:17,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:46:17,948 INFO L225 Difference]: With dead ends: 216 [2021-11-02 22:46:17,948 INFO L226 Difference]: Without dead ends: 216 [2021-11-02 22:46:17,949 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2021-11-02 22:46:17,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-11-02 22:46:17,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 213. [2021-11-02 22:46:17,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 207 states have (on average 1.067632850241546) internal successors, (221), 209 states have internal predecessors, (221), 2 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) [2021-11-02 22:46:17,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 224 transitions. [2021-11-02 22:46:17,956 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 224 transitions. Word has length 164 [2021-11-02 22:46:17,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:46:17,956 INFO L470 AbstractCegarLoop]: Abstraction has 213 states and 224 transitions. [2021-11-02 22:46:17,957 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 3.864864864864865) internal successors, (143), 36 states have internal predecessors, (143), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:17,957 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 224 transitions. [2021-11-02 22:46:17,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-11-02 22:46:17,958 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:46:17,958 INFO L513 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:46:17,995 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-02 22:46:18,173 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-02 22:46:18,174 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:46:18,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:46:18,174 INFO L85 PathProgramCache]: Analyzing trace with hash -1238866635, now seen corresponding path program 26 times [2021-11-02 22:46:18,174 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:46:18,174 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1026257145] [2021-11-02 22:46:18,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:46:18,175 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:46:18,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:18,882 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:46:18,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:18,888 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 0 proven. 2145 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-11-02 22:46:18,888 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:46:18,889 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1026257145] [2021-11-02 22:46:18,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1026257145] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:18,889 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2053332875] [2021-11-02 22:46:18,889 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:46:18,889 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:18,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:46:18,904 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:46:18,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-02 22:46:19,998 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:46:19,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:46:20,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 560 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-02 22:46:20,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:46:20,461 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 0 proven. 2145 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-11-02 22:46:20,461 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2053332875] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:20,461 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:46:20,461 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-11-02 22:46:20,462 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809407611] [2021-11-02 22:46:20,462 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-02 22:46:20,462 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:46:20,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-02 22:46:20,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2021-11-02 22:46:20,463 INFO L87 Difference]: Start difference. First operand 213 states and 224 transitions. Second operand has 38 states, 38 states have (on average 3.8684210526315788) internal successors, (147), 37 states have internal predecessors, (147), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:20,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:46:20,616 INFO L93 Difference]: Finished difference Result 220 states and 231 transitions. [2021-11-02 22:46:20,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-02 22:46:20,617 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.8684210526315788) internal successors, (147), 37 states have internal predecessors, (147), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 168 [2021-11-02 22:46:20,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:46:20,618 INFO L225 Difference]: With dead ends: 220 [2021-11-02 22:46:20,618 INFO L226 Difference]: Without dead ends: 220 [2021-11-02 22:46:20,619 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2021-11-02 22:46:20,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-11-02 22:46:20,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 217. [2021-11-02 22:46:20,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 211 states have (on average 1.066350710900474) internal successors, (225), 213 states have internal predecessors, (225), 2 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) [2021-11-02 22:46:20,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 228 transitions. [2021-11-02 22:46:20,626 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 228 transitions. Word has length 168 [2021-11-02 22:46:20,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:46:20,626 INFO L470 AbstractCegarLoop]: Abstraction has 217 states and 228 transitions. [2021-11-02 22:46:20,627 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.8684210526315788) internal successors, (147), 37 states have internal predecessors, (147), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:20,627 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 228 transitions. [2021-11-02 22:46:20,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-11-02 22:46:20,628 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:46:20,628 INFO L513 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:46:20,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-02 22:46:20,853 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-02 22:46:20,854 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:46:20,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:46:20,854 INFO L85 PathProgramCache]: Analyzing trace with hash -1952626568, now seen corresponding path program 27 times [2021-11-02 22:46:20,854 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:46:20,854 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435685554] [2021-11-02 22:46:20,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:46:20,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:46:20,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:21,728 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:46:21,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:21,734 INFO L134 CoverageAnalysis]: Checked inductivity of 2395 backedges. 0 proven. 2278 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-11-02 22:46:21,735 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:46:21,735 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435685554] [2021-11-02 22:46:21,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435685554] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:21,735 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1861568584] [2021-11-02 22:46:21,735 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:46:21,735 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:21,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:46:21,738 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:46:21,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-02 22:46:22,982 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-02 22:46:22,982 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:46:22,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-02 22:46:22,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:46:23,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:46:24,801 INFO L134 CoverageAnalysis]: Checked inductivity of 2395 backedges. 133 proven. 117 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2021-11-02 22:46:24,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1861568584] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:24,805 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:46:24,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 16] total 53 [2021-11-02 22:46:24,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429644916] [2021-11-02 22:46:24,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-02 22:46:24,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:46:24,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-02 22:46:24,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=738, Invalid=2018, Unknown=0, NotChecked=0, Total=2756 [2021-11-02 22:46:24,811 INFO L87 Difference]: Start difference. First operand 217 states and 228 transitions. Second operand has 53 states, 53 states have (on average 3.490566037735849) internal successors, (185), 52 states have internal predecessors, (185), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:26,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:46:26,713 INFO L93 Difference]: Finished difference Result 234 states and 246 transitions. [2021-11-02 22:46:26,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-02 22:46:26,714 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 3.490566037735849) internal successors, (185), 52 states have internal predecessors, (185), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 172 [2021-11-02 22:46:26,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:46:26,716 INFO L225 Difference]: With dead ends: 234 [2021-11-02 22:46:26,716 INFO L226 Difference]: Without dead ends: 234 [2021-11-02 22:46:26,718 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1720 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2316, Invalid=7584, Unknown=0, NotChecked=0, Total=9900 [2021-11-02 22:46:26,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2021-11-02 22:46:26,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 232. [2021-11-02 22:46:26,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 226 states have (on average 1.0663716814159292) internal successors, (241), 228 states have internal predecessors, (241), 2 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) [2021-11-02 22:46:26,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 244 transitions. [2021-11-02 22:46:26,726 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 244 transitions. Word has length 172 [2021-11-02 22:46:26,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:46:26,727 INFO L470 AbstractCegarLoop]: Abstraction has 232 states and 244 transitions. [2021-11-02 22:46:26,727 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 3.490566037735849) internal successors, (185), 52 states have internal predecessors, (185), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:26,727 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 244 transitions. [2021-11-02 22:46:26,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2021-11-02 22:46:26,729 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:46:26,729 INFO L513 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:46:26,781 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-02 22:46:26,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-02 22:46:26,946 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:46:26,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:46:26,946 INFO L85 PathProgramCache]: Analyzing trace with hash 1378214943, now seen corresponding path program 28 times [2021-11-02 22:46:26,946 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:46:26,946 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1749358786] [2021-11-02 22:46:26,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:46:26,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:46:27,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:27,909 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:46:27,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:27,915 INFO L134 CoverageAnalysis]: Checked inductivity of 2701 backedges. 0 proven. 2556 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-02 22:46:27,915 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:46:27,916 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1749358786] [2021-11-02 22:46:27,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1749358786] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:27,916 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [977054387] [2021-11-02 22:46:27,916 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:46:27,916 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:27,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:46:27,917 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:46:27,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-02 22:46:31,144 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:46:31,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:46:31,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-02 22:46:31,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:46:31,657 INFO L134 CoverageAnalysis]: Checked inductivity of 2701 backedges. 0 proven. 2556 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-02 22:46:31,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [977054387] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:31,658 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:46:31,658 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-11-02 22:46:31,658 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130797090] [2021-11-02 22:46:31,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-02 22:46:31,659 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:46:31,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-02 22:46:31,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2021-11-02 22:46:31,660 INFO L87 Difference]: Start difference. First operand 232 states and 244 transitions. Second operand has 41 states, 41 states have (on average 3.8780487804878048) internal successors, (159), 40 states have internal predecessors, (159), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:31,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:46:31,868 INFO L93 Difference]: Finished difference Result 239 states and 251 transitions. [2021-11-02 22:46:31,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-02 22:46:31,869 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.8780487804878048) internal successors, (159), 40 states have internal predecessors, (159), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 183 [2021-11-02 22:46:31,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:46:31,870 INFO L225 Difference]: With dead ends: 239 [2021-11-02 22:46:31,871 INFO L226 Difference]: Without dead ends: 239 [2021-11-02 22:46:31,871 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2021-11-02 22:46:31,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2021-11-02 22:46:31,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 236. [2021-11-02 22:46:31,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 236 states, 230 states have (on average 1.065217391304348) internal successors, (245), 232 states have internal predecessors, (245), 2 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) [2021-11-02 22:46:31,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 248 transitions. [2021-11-02 22:46:31,879 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 248 transitions. Word has length 183 [2021-11-02 22:46:31,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:46:31,879 INFO L470 AbstractCegarLoop]: Abstraction has 236 states and 248 transitions. [2021-11-02 22:46:31,880 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 3.8780487804878048) internal successors, (159), 40 states have internal predecessors, (159), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:31,880 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 248 transitions. [2021-11-02 22:46:31,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-11-02 22:46:31,882 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:46:31,882 INFO L513 BasicCegarLoop]: trace histogram [37, 37, 37, 37, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:46:31,920 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2021-11-02 22:46:32,097 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-02 22:46:32,098 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:46:32,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:46:32,098 INFO L85 PathProgramCache]: Analyzing trace with hash -954486148, now seen corresponding path program 29 times [2021-11-02 22:46:32,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:46:32,098 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [907988272] [2021-11-02 22:46:32,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:46:32,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:46:32,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:32,932 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:46:32,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:32,938 INFO L134 CoverageAnalysis]: Checked inductivity of 2846 backedges. 0 proven. 2701 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-02 22:46:32,939 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:46:32,939 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [907988272] [2021-11-02 22:46:32,939 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [907988272] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:32,939 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [208859354] [2021-11-02 22:46:32,940 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:46:32,940 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:32,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:46:32,946 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:46:32,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-02 22:46:36,447 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 38 check-sat command(s) [2021-11-02 22:46:36,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:46:36,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 621 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-02 22:46:36,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:46:36,987 INFO L134 CoverageAnalysis]: Checked inductivity of 2846 backedges. 0 proven. 2701 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-02 22:46:36,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [208859354] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:36,988 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:46:36,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40] total 42 [2021-11-02 22:46:36,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010536649] [2021-11-02 22:46:36,989 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-02 22:46:36,990 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:46:36,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-02 22:46:36,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2021-11-02 22:46:36,991 INFO L87 Difference]: Start difference. First operand 236 states and 248 transitions. Second operand has 42 states, 42 states have (on average 3.880952380952381) internal successors, (163), 41 states have internal predecessors, (163), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:37,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:46:37,188 INFO L93 Difference]: Finished difference Result 243 states and 255 transitions. [2021-11-02 22:46:37,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-02 22:46:37,189 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 3.880952380952381) internal successors, (163), 41 states have internal predecessors, (163), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 187 [2021-11-02 22:46:37,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:46:37,191 INFO L225 Difference]: With dead ends: 243 [2021-11-02 22:46:37,191 INFO L226 Difference]: Without dead ends: 243 [2021-11-02 22:46:37,192 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 188 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2021-11-02 22:46:37,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-11-02 22:46:37,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 240. [2021-11-02 22:46:37,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 240 states, 234 states have (on average 1.064102564102564) internal successors, (249), 236 states have internal predecessors, (249), 2 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) [2021-11-02 22:46:37,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 252 transitions. [2021-11-02 22:46:37,200 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 252 transitions. Word has length 187 [2021-11-02 22:46:37,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:46:37,201 INFO L470 AbstractCegarLoop]: Abstraction has 240 states and 252 transitions. [2021-11-02 22:46:37,201 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 3.880952380952381) internal successors, (163), 41 states have internal predecessors, (163), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:37,201 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 252 transitions. [2021-11-02 22:46:37,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-11-02 22:46:37,203 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:46:37,203 INFO L513 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:46:37,260 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-02 22:46:37,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:37,418 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:46:37,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:46:37,418 INFO L85 PathProgramCache]: Analyzing trace with hash 362351193, now seen corresponding path program 30 times [2021-11-02 22:46:37,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:46:37,418 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [97097602] [2021-11-02 22:46:37,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:46:37,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:46:37,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:38,352 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:46:38,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:38,356 INFO L134 CoverageAnalysis]: Checked inductivity of 2995 backedges. 0 proven. 2850 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-02 22:46:38,357 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:46:38,357 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [97097602] [2021-11-02 22:46:38,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [97097602] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:38,357 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196161648] [2021-11-02 22:46:38,357 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:46:38,357 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:38,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:46:38,358 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:46:38,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-02 22:46:40,641 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2021-11-02 22:46:40,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:46:40,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 434 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-02 22:46:40,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:46:40,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:46:42,233 INFO L134 CoverageAnalysis]: Checked inductivity of 2995 backedges. 149 proven. 145 refuted. 0 times theorem prover too weak. 2701 trivial. 0 not checked. [2021-11-02 22:46:42,233 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1196161648] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:42,233 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:46:42,233 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 17] total 58 [2021-11-02 22:46:42,234 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513483221] [2021-11-02 22:46:42,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-02 22:46:42,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:46:42,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-02 22:46:42,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=2403, Unknown=0, NotChecked=0, Total=3306 [2021-11-02 22:46:42,240 INFO L87 Difference]: Start difference. First operand 240 states and 252 transitions. Second operand has 58 states, 58 states have (on average 3.5172413793103448) internal successors, (204), 57 states have internal predecessors, (204), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:44,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:46:44,484 INFO L93 Difference]: Finished difference Result 257 states and 270 transitions. [2021-11-02 22:46:44,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-11-02 22:46:44,485 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 3.5172413793103448) internal successors, (204), 57 states have internal predecessors, (204), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 191 [2021-11-02 22:46:44,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:46:44,486 INFO L225 Difference]: With dead ends: 257 [2021-11-02 22:46:44,486 INFO L226 Difference]: Without dead ends: 257 [2021-11-02 22:46:44,487 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2077 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2825, Invalid=9165, Unknown=0, NotChecked=0, Total=11990 [2021-11-02 22:46:44,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-11-02 22:46:44,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 255. [2021-11-02 22:46:44,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 249 states have (on average 1.0642570281124497) internal successors, (265), 251 states have internal predecessors, (265), 2 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) [2021-11-02 22:46:44,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 268 transitions. [2021-11-02 22:46:44,493 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 268 transitions. Word has length 191 [2021-11-02 22:46:44,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:46:44,494 INFO L470 AbstractCegarLoop]: Abstraction has 255 states and 268 transitions. [2021-11-02 22:46:44,494 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 3.5172413793103448) internal successors, (204), 57 states have internal predecessors, (204), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:44,495 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 268 transitions. [2021-11-02 22:46:44,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2021-11-02 22:46:44,496 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:46:44,497 INFO L513 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:46:44,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-02 22:46:44,721 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-02 22:46:44,722 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:46:44,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:46:44,722 INFO L85 PathProgramCache]: Analyzing trace with hash 536042474, now seen corresponding path program 31 times [2021-11-02 22:46:44,722 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:46:44,722 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330005738] [2021-11-02 22:46:44,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:46:44,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:46:44,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:45,680 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:46:45,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:45,685 INFO L134 CoverageAnalysis]: Checked inductivity of 3336 backedges. 0 proven. 3160 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2021-11-02 22:46:45,686 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:46:45,686 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [330005738] [2021-11-02 22:46:45,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [330005738] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:45,686 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373884106] [2021-11-02 22:46:45,686 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:46:45,686 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:45,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:46:45,690 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:46:45,701 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-02 22:46:47,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:47,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 671 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-02 22:46:47,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:46:48,042 INFO L134 CoverageAnalysis]: Checked inductivity of 3336 backedges. 0 proven. 3160 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2021-11-02 22:46:48,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1373884106] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:48,042 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:46:48,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43] total 45 [2021-11-02 22:46:48,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102046406] [2021-11-02 22:46:48,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-02 22:46:48,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:46:48,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-02 22:46:48,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2021-11-02 22:46:48,045 INFO L87 Difference]: Start difference. First operand 255 states and 268 transitions. Second operand has 45 states, 45 states have (on average 3.888888888888889) internal successors, (175), 44 states have internal predecessors, (175), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:48,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:46:48,219 INFO L93 Difference]: Finished difference Result 262 states and 275 transitions. [2021-11-02 22:46:48,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-02 22:46:48,220 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 3.888888888888889) internal successors, (175), 44 states have internal predecessors, (175), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 202 [2021-11-02 22:46:48,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:46:48,222 INFO L225 Difference]: With dead ends: 262 [2021-11-02 22:46:48,222 INFO L226 Difference]: Without dead ends: 262 [2021-11-02 22:46:48,222 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 203 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2021-11-02 22:46:48,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2021-11-02 22:46:48,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 259. [2021-11-02 22:46:48,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 253 states have (on average 1.0632411067193677) internal successors, (269), 255 states have internal predecessors, (269), 2 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) [2021-11-02 22:46:48,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 272 transitions. [2021-11-02 22:46:48,230 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 272 transitions. Word has length 202 [2021-11-02 22:46:48,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:46:48,231 INFO L470 AbstractCegarLoop]: Abstraction has 259 states and 272 transitions. [2021-11-02 22:46:48,231 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 3.888888888888889) internal successors, (175), 44 states have internal predecessors, (175), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:48,231 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 272 transitions. [2021-11-02 22:46:48,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2021-11-02 22:46:48,233 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:46:48,233 INFO L513 BasicCegarLoop]: trace histogram [41, 41, 41, 41, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:46:48,279 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-02 22:46:48,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-02 22:46:48,450 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:46:48,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:46:48,450 INFO L85 PathProgramCache]: Analyzing trace with hash -1255559571, now seen corresponding path program 32 times [2021-11-02 22:46:48,450 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:46:48,450 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472383099] [2021-11-02 22:46:48,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:46:48,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:46:48,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:49,440 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:46:49,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:49,444 INFO L134 CoverageAnalysis]: Checked inductivity of 3497 backedges. 0 proven. 3321 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2021-11-02 22:46:49,444 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:46:49,444 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472383099] [2021-11-02 22:46:49,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1472383099] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:49,445 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [929027751] [2021-11-02 22:46:49,445 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:46:49,445 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:49,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:46:49,447 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:46:49,472 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-02 22:46:51,226 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:46:51,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:46:51,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 682 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-02 22:46:51,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:46:51,781 INFO L134 CoverageAnalysis]: Checked inductivity of 3497 backedges. 0 proven. 3321 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2021-11-02 22:46:51,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [929027751] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:51,781 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:46:51,781 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44] total 46 [2021-11-02 22:46:51,781 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307117588] [2021-11-02 22:46:51,782 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-02 22:46:51,782 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:46:51,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-02 22:46:51,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2021-11-02 22:46:51,783 INFO L87 Difference]: Start difference. First operand 259 states and 272 transitions. Second operand has 46 states, 46 states have (on average 3.891304347826087) internal successors, (179), 45 states have internal predecessors, (179), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:51,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:46:51,993 INFO L93 Difference]: Finished difference Result 266 states and 279 transitions. [2021-11-02 22:46:51,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-02 22:46:51,993 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.891304347826087) internal successors, (179), 45 states have internal predecessors, (179), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 206 [2021-11-02 22:46:51,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:46:51,995 INFO L225 Difference]: With dead ends: 266 [2021-11-02 22:46:51,996 INFO L226 Difference]: Without dead ends: 266 [2021-11-02 22:46:51,996 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 207 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2021-11-02 22:46:51,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-11-02 22:46:52,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 263. [2021-11-02 22:46:52,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 257 states have (on average 1.0622568093385214) internal successors, (273), 259 states have internal predecessors, (273), 2 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) [2021-11-02 22:46:52,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 276 transitions. [2021-11-02 22:46:52,004 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 276 transitions. Word has length 206 [2021-11-02 22:46:52,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:46:52,004 INFO L470 AbstractCegarLoop]: Abstraction has 263 states and 276 transitions. [2021-11-02 22:46:52,005 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 3.891304347826087) internal successors, (179), 45 states have internal predecessors, (179), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:52,005 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 276 transitions. [2021-11-02 22:46:52,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2021-11-02 22:46:52,019 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:46:52,021 INFO L513 BasicCegarLoop]: trace histogram [42, 42, 42, 42, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:46:52,055 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-02 22:46:52,229 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:52,230 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:46:52,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:46:52,230 INFO L85 PathProgramCache]: Analyzing trace with hash 1243416432, now seen corresponding path program 33 times [2021-11-02 22:46:52,230 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:46:52,230 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [660622475] [2021-11-02 22:46:52,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:46:52,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:46:52,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:53,175 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:46:53,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:46:53,178 INFO L134 CoverageAnalysis]: Checked inductivity of 3662 backedges. 0 proven. 3486 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2021-11-02 22:46:53,178 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:46:53,179 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [660622475] [2021-11-02 22:46:53,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [660622475] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:53,179 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126333598] [2021-11-02 22:46:53,179 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:46:53,179 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:53,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:46:53,180 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:46:53,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-02 22:46:54,912 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-02 22:46:54,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:46:54,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-02 22:46:54,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:46:54,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:46:56,643 INFO L134 CoverageAnalysis]: Checked inductivity of 3662 backedges. 165 proven. 176 refuted. 0 times theorem prover too weak. 3321 trivial. 0 not checked. [2021-11-02 22:46:56,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1126333598] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:46:56,644 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:46:56,644 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 18] total 63 [2021-11-02 22:46:56,644 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142222502] [2021-11-02 22:46:56,645 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-02 22:46:56,645 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:46:56,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-02 22:46:56,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1085, Invalid=2821, Unknown=0, NotChecked=0, Total=3906 [2021-11-02 22:46:56,647 INFO L87 Difference]: Start difference. First operand 263 states and 276 transitions. Second operand has 63 states, 63 states have (on average 3.5396825396825395) internal successors, (223), 62 states have internal predecessors, (223), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:59,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:46:59,265 INFO L93 Difference]: Finished difference Result 280 states and 294 transitions. [2021-11-02 22:46:59,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-02 22:46:59,265 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 3.5396825396825395) internal successors, (223), 62 states have internal predecessors, (223), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 210 [2021-11-02 22:46:59,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:46:59,267 INFO L225 Difference]: With dead ends: 280 [2021-11-02 22:46:59,267 INFO L226 Difference]: Without dead ends: 280 [2021-11-02 22:46:59,269 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2467 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=3385, Invalid=10895, Unknown=0, NotChecked=0, Total=14280 [2021-11-02 22:46:59,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2021-11-02 22:46:59,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 278. [2021-11-02 22:46:59,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 272 states have (on average 1.0625) internal successors, (289), 274 states have internal predecessors, (289), 2 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) [2021-11-02 22:46:59,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 292 transitions. [2021-11-02 22:46:59,276 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 292 transitions. Word has length 210 [2021-11-02 22:46:59,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:46:59,277 INFO L470 AbstractCegarLoop]: Abstraction has 278 states and 292 transitions. [2021-11-02 22:46:59,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 3.5396825396825395) internal successors, (223), 62 states have internal predecessors, (223), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:46:59,277 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 292 transitions. [2021-11-02 22:46:59,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2021-11-02 22:46:59,279 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:46:59,279 INFO L513 BasicCegarLoop]: trace histogram [44, 44, 44, 44, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:46:59,324 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-02 22:46:59,501 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:46:59,502 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:46:59,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:46:59,502 INFO L85 PathProgramCache]: Analyzing trace with hash 1791895207, now seen corresponding path program 34 times [2021-11-02 22:46:59,502 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:46:59,502 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947397007] [2021-11-02 22:46:59,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:46:59,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:46:59,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:47:00,716 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:47:00,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:47:00,722 INFO L134 CoverageAnalysis]: Checked inductivity of 4038 backedges. 0 proven. 3828 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-02 22:47:00,722 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:47:00,722 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947397007] [2021-11-02 22:47:00,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1947397007] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:47:00,722 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1124536688] [2021-11-02 22:47:00,723 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:47:00,723 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:47:00,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:47:00,726 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:47:00,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-02 22:47:28,644 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:47:28,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:47:28,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 732 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-02 22:47:28,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:47:29,388 INFO L134 CoverageAnalysis]: Checked inductivity of 4038 backedges. 0 proven. 3828 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-02 22:47:29,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1124536688] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:47:29,388 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:47:29,389 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47] total 49 [2021-11-02 22:47:29,389 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485316915] [2021-11-02 22:47:29,390 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-02 22:47:29,390 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:47:29,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-02 22:47:29,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2021-11-02 22:47:29,392 INFO L87 Difference]: Start difference. First operand 278 states and 292 transitions. Second operand has 49 states, 49 states have (on average 3.8979591836734695) internal successors, (191), 48 states have internal predecessors, (191), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:47:29,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:47:29,723 INFO L93 Difference]: Finished difference Result 285 states and 299 transitions. [2021-11-02 22:47:29,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-02 22:47:29,724 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.8979591836734695) internal successors, (191), 48 states have internal predecessors, (191), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 221 [2021-11-02 22:47:29,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:47:29,726 INFO L225 Difference]: With dead ends: 285 [2021-11-02 22:47:29,726 INFO L226 Difference]: Without dead ends: 285 [2021-11-02 22:47:29,726 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 222 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2021-11-02 22:47:29,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2021-11-02 22:47:29,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 282. [2021-11-02 22:47:29,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 276 states have (on average 1.0615942028985508) internal successors, (293), 278 states have internal predecessors, (293), 2 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) [2021-11-02 22:47:29,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 296 transitions. [2021-11-02 22:47:29,732 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 296 transitions. Word has length 221 [2021-11-02 22:47:29,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:47:29,733 INFO L470 AbstractCegarLoop]: Abstraction has 282 states and 296 transitions. [2021-11-02 22:47:29,733 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 3.8979591836734695) internal successors, (191), 48 states have internal predecessors, (191), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:47:29,734 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 296 transitions. [2021-11-02 22:47:29,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2021-11-02 22:47:29,736 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:47:29,736 INFO L513 BasicCegarLoop]: trace histogram [45, 45, 45, 45, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:47:29,792 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2021-11-02 22:47:29,949 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-11-02 22:47:29,950 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:47:29,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:47:29,950 INFO L85 PathProgramCache]: Analyzing trace with hash 1280526148, now seen corresponding path program 35 times [2021-11-02 22:47:29,950 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:47:29,950 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838580042] [2021-11-02 22:47:29,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:47:29,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:47:30,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:47:31,081 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:47:31,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:47:31,084 INFO L134 CoverageAnalysis]: Checked inductivity of 4215 backedges. 0 proven. 4005 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-02 22:47:31,085 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:47:31,085 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838580042] [2021-11-02 22:47:31,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [838580042] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:47:31,085 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1736060224] [2021-11-02 22:47:31,085 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:47:31,085 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:47:31,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:47:31,086 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:47:31,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-02 22:47:54,918 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 46 check-sat command(s) [2021-11-02 22:47:54,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:47:54,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 743 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-02 22:47:54,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:47:55,598 INFO L134 CoverageAnalysis]: Checked inductivity of 4215 backedges. 0 proven. 4005 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-02 22:47:55,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1736060224] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:47:55,599 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:47:55,599 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-11-02 22:47:55,599 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561951031] [2021-11-02 22:47:55,600 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-02 22:47:55,600 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:47:55,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-02 22:47:55,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2021-11-02 22:47:55,602 INFO L87 Difference]: Start difference. First operand 282 states and 296 transitions. Second operand has 50 states, 50 states have (on average 3.9) internal successors, (195), 49 states have internal predecessors, (195), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:47:55,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:47:55,863 INFO L93 Difference]: Finished difference Result 289 states and 303 transitions. [2021-11-02 22:47:55,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-02 22:47:55,864 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.9) internal successors, (195), 49 states have internal predecessors, (195), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 225 [2021-11-02 22:47:55,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:47:55,866 INFO L225 Difference]: With dead ends: 289 [2021-11-02 22:47:55,866 INFO L226 Difference]: Without dead ends: 289 [2021-11-02 22:47:55,866 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 226 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2021-11-02 22:47:55,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-02 22:47:55,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 286. [2021-11-02 22:47:55,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 280 states have (on average 1.0607142857142857) internal successors, (297), 282 states have internal predecessors, (297), 2 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) [2021-11-02 22:47:55,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 300 transitions. [2021-11-02 22:47:55,873 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 300 transitions. Word has length 225 [2021-11-02 22:47:55,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:47:55,874 INFO L470 AbstractCegarLoop]: Abstraction has 286 states and 300 transitions. [2021-11-02 22:47:55,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 3.9) internal successors, (195), 49 states have internal predecessors, (195), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:47:55,874 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 300 transitions. [2021-11-02 22:47:55,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2021-11-02 22:47:55,876 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:47:55,876 INFO L513 BasicCegarLoop]: trace histogram [46, 46, 46, 46, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:47:55,933 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-02 22:47:56,089 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-11-02 22:47:56,090 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:47:56,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:47:56,090 INFO L85 PathProgramCache]: Analyzing trace with hash -1360211615, now seen corresponding path program 36 times [2021-11-02 22:47:56,090 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:47:56,090 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099526418] [2021-11-02 22:47:56,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:47:56,090 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:47:56,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:47:57,478 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:47:57,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:47:57,482 INFO L134 CoverageAnalysis]: Checked inductivity of 4396 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-02 22:47:57,482 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:47:57,482 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1099526418] [2021-11-02 22:47:57,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1099526418] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:47:57,483 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [412255807] [2021-11-02 22:47:57,483 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:47:57,483 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:47:57,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:47:57,484 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:47:57,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-02 22:48:02,943 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-11-02 22:48:02,944 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:48:02,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-02 22:48:02,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:48:02,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:48:05,233 INFO L134 CoverageAnalysis]: Checked inductivity of 4396 backedges. 181 proven. 210 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2021-11-02 22:48:05,233 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [412255807] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:48:05,233 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:48:05,233 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 19] total 68 [2021-11-02 22:48:05,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376850742] [2021-11-02 22:48:05,234 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-02 22:48:05,234 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:48:05,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-02 22:48:05,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1284, Invalid=3272, Unknown=0, NotChecked=0, Total=4556 [2021-11-02 22:48:05,235 INFO L87 Difference]: Start difference. First operand 286 states and 300 transitions. Second operand has 68 states, 68 states have (on average 3.5588235294117645) internal successors, (242), 67 states have internal predecessors, (242), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:48:08,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:48:08,446 INFO L93 Difference]: Finished difference Result 303 states and 318 transitions. [2021-11-02 22:48:08,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-11-02 22:48:08,447 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 3.5588235294117645) internal successors, (242), 67 states have internal predecessors, (242), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 229 [2021-11-02 22:48:08,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:48:08,449 INFO L225 Difference]: With dead ends: 303 [2021-11-02 22:48:08,449 INFO L226 Difference]: Without dead ends: 303 [2021-11-02 22:48:08,451 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 213 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2890 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=3996, Invalid=12774, Unknown=0, NotChecked=0, Total=16770 [2021-11-02 22:48:08,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2021-11-02 22:48:08,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 301. [2021-11-02 22:48:08,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 295 states have (on average 1.0610169491525423) internal successors, (313), 297 states have internal predecessors, (313), 2 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) [2021-11-02 22:48:08,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 316 transitions. [2021-11-02 22:48:08,459 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 316 transitions. Word has length 229 [2021-11-02 22:48:08,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:48:08,460 INFO L470 AbstractCegarLoop]: Abstraction has 301 states and 316 transitions. [2021-11-02 22:48:08,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 3.5588235294117645) internal successors, (242), 67 states have internal predecessors, (242), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:48:08,461 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 316 transitions. [2021-11-02 22:48:08,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2021-11-02 22:48:08,463 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:48:08,463 INFO L513 BasicCegarLoop]: trace histogram [48, 48, 48, 48, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:48:08,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-02 22:48:08,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-11-02 22:48:08,690 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:48:08,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:48:08,690 INFO L85 PathProgramCache]: Analyzing trace with hash 1690731362, now seen corresponding path program 37 times [2021-11-02 22:48:08,690 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:48:08,690 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [343655698] [2021-11-02 22:48:08,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:48:08,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:48:08,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:48:10,122 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:48:10,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:48:10,126 INFO L134 CoverageAnalysis]: Checked inductivity of 4807 backedges. 0 proven. 4560 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-11-02 22:48:10,126 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:48:10,126 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [343655698] [2021-11-02 22:48:10,126 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [343655698] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:48:10,126 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1248773320] [2021-11-02 22:48:10,126 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:48:10,126 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:48:10,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:48:10,127 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:48:10,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-02 22:48:12,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:48:12,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 793 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-02 22:48:12,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:48:13,017 INFO L134 CoverageAnalysis]: Checked inductivity of 4807 backedges. 0 proven. 4560 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-11-02 22:48:13,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1248773320] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:48:13,018 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:48:13,018 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51] total 53 [2021-11-02 22:48:13,018 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891358807] [2021-11-02 22:48:13,019 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-02 22:48:13,019 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:48:13,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-02 22:48:13,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2021-11-02 22:48:13,020 INFO L87 Difference]: Start difference. First operand 301 states and 316 transitions. Second operand has 53 states, 53 states have (on average 3.9056603773584904) internal successors, (207), 52 states have internal predecessors, (207), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:48:13,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:48:13,307 INFO L93 Difference]: Finished difference Result 308 states and 323 transitions. [2021-11-02 22:48:13,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-02 22:48:13,308 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 3.9056603773584904) internal successors, (207), 52 states have internal predecessors, (207), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 240 [2021-11-02 22:48:13,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:48:13,309 INFO L225 Difference]: With dead ends: 308 [2021-11-02 22:48:13,309 INFO L226 Difference]: Without dead ends: 308 [2021-11-02 22:48:13,310 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 241 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2021-11-02 22:48:13,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2021-11-02 22:48:13,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 305. [2021-11-02 22:48:13,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 299 states have (on average 1.060200668896321) internal successors, (317), 301 states have internal predecessors, (317), 2 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) [2021-11-02 22:48:13,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 320 transitions. [2021-11-02 22:48:13,318 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 320 transitions. Word has length 240 [2021-11-02 22:48:13,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:48:13,318 INFO L470 AbstractCegarLoop]: Abstraction has 305 states and 320 transitions. [2021-11-02 22:48:13,319 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 3.9056603773584904) internal successors, (207), 52 states have internal predecessors, (207), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:48:13,319 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 320 transitions. [2021-11-02 22:48:13,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2021-11-02 22:48:13,321 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:48:13,321 INFO L513 BasicCegarLoop]: trace histogram [49, 49, 49, 49, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:48:13,366 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-02 22:48:13,537 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:48:13,538 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:48:13,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:48:13,538 INFO L85 PathProgramCache]: Analyzing trace with hash -1943151707, now seen corresponding path program 38 times [2021-11-02 22:48:13,538 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:48:13,538 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1495738385] [2021-11-02 22:48:13,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:48:13,538 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:48:13,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:48:14,927 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:48:14,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:48:14,931 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 0 proven. 4753 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-11-02 22:48:14,931 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:48:14,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1495738385] [2021-11-02 22:48:14,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1495738385] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:48:14,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [16690724] [2021-11-02 22:48:14,931 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:48:14,932 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:48:14,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:48:14,933 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:48:14,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-02 22:48:17,181 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:48:17,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:48:17,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 804 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-02 22:48:17,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:48:17,836 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 0 proven. 4753 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-11-02 22:48:17,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [16690724] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:48:17,836 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:48:17,837 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52] total 54 [2021-11-02 22:48:17,837 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603153926] [2021-11-02 22:48:17,837 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-02 22:48:17,837 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:48:17,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-02 22:48:17,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2021-11-02 22:48:17,838 INFO L87 Difference]: Start difference. First operand 305 states and 320 transitions. Second operand has 54 states, 54 states have (on average 3.9074074074074074) internal successors, (211), 53 states have internal predecessors, (211), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:48:18,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:48:18,069 INFO L93 Difference]: Finished difference Result 312 states and 327 transitions. [2021-11-02 22:48:18,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-02 22:48:18,069 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 3.9074074074074074) internal successors, (211), 53 states have internal predecessors, (211), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 244 [2021-11-02 22:48:18,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:48:18,071 INFO L225 Difference]: With dead ends: 312 [2021-11-02 22:48:18,072 INFO L226 Difference]: Without dead ends: 312 [2021-11-02 22:48:18,072 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 245 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2021-11-02 22:48:18,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2021-11-02 22:48:18,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 309. [2021-11-02 22:48:18,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 303 states have (on average 1.0594059405940595) internal successors, (321), 305 states have internal predecessors, (321), 2 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) [2021-11-02 22:48:18,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 324 transitions. [2021-11-02 22:48:18,080 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 324 transitions. Word has length 244 [2021-11-02 22:48:18,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:48:18,081 INFO L470 AbstractCegarLoop]: Abstraction has 309 states and 324 transitions. [2021-11-02 22:48:18,081 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 3.9074074074074074) internal successors, (211), 53 states have internal predecessors, (211), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:48:18,082 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 324 transitions. [2021-11-02 22:48:18,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2021-11-02 22:48:18,084 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:48:18,084 INFO L513 BasicCegarLoop]: trace histogram [50, 50, 50, 50, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:48:18,127 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-02 22:48:18,305 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-02 22:48:18,306 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:48:18,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:48:18,306 INFO L85 PathProgramCache]: Analyzing trace with hash -2082907544, now seen corresponding path program 39 times [2021-11-02 22:48:18,306 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:48:18,306 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741841208] [2021-11-02 22:48:18,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:48:18,307 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:48:18,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:48:19,898 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:48:19,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:48:19,902 INFO L134 CoverageAnalysis]: Checked inductivity of 5197 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-11-02 22:48:19,902 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:48:19,902 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741841208] [2021-11-02 22:48:19,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1741841208] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:48:19,902 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1672156369] [2021-11-02 22:48:19,905 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:48:19,906 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:48:19,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:48:19,907 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:48:19,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-02 22:48:22,352 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-02 22:48:22,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:48:22,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-02 22:48:22,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:48:22,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:48:24,832 INFO L134 CoverageAnalysis]: Checked inductivity of 5197 backedges. 0 proven. 247 refuted. 0 times theorem prover too weak. 4950 trivial. 0 not checked. [2021-11-02 22:48:24,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1672156369] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:48:24,832 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:48:24,832 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 18] total 71 [2021-11-02 22:48:24,833 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616002665] [2021-11-02 22:48:24,833 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-02 22:48:24,833 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:48:24,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-02 22:48:24,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1493, Invalid=3477, Unknown=0, NotChecked=0, Total=4970 [2021-11-02 22:48:24,834 INFO L87 Difference]: Start difference. First operand 309 states and 324 transitions. Second operand has 71 states, 71 states have (on average 3.619718309859155) internal successors, (257), 70 states have internal predecessors, (257), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:48:27,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:48:27,862 INFO L93 Difference]: Finished difference Result 325 states and 341 transitions. [2021-11-02 22:48:27,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-02 22:48:27,862 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.619718309859155) internal successors, (257), 70 states have internal predecessors, (257), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 248 [2021-11-02 22:48:27,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:48:27,864 INFO L225 Difference]: With dead ends: 325 [2021-11-02 22:48:27,864 INFO L226 Difference]: Without dead ends: 325 [2021-11-02 22:48:27,866 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 369 GetRequests, 233 SyntacticMatches, 0 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3198 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=4533, Invalid=14373, Unknown=0, NotChecked=0, Total=18906 [2021-11-02 22:48:27,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2021-11-02 22:48:27,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 320. [2021-11-02 22:48:27,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 320 states, 314 states have (on average 1.0605095541401275) internal successors, (333), 316 states have internal predecessors, (333), 2 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) [2021-11-02 22:48:27,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 336 transitions. [2021-11-02 22:48:27,875 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 336 transitions. Word has length 248 [2021-11-02 22:48:27,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:48:27,875 INFO L470 AbstractCegarLoop]: Abstraction has 320 states and 336 transitions. [2021-11-02 22:48:27,876 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 3.619718309859155) internal successors, (257), 70 states have internal predecessors, (257), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:48:27,876 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 336 transitions. [2021-11-02 22:48:27,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2021-11-02 22:48:27,878 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:48:27,879 INFO L513 BasicCegarLoop]: trace histogram [51, 51, 51, 51, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:48:27,923 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-02 22:48:28,093 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-02 22:48:28,094 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:48:28,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:48:28,094 INFO L85 PathProgramCache]: Analyzing trace with hash -2127610926, now seen corresponding path program 40 times [2021-11-02 22:48:28,094 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:48:28,094 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256318557] [2021-11-02 22:48:28,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:48:28,094 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:48:28,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:48:29,472 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:48:29,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:48:29,481 INFO L134 CoverageAnalysis]: Checked inductivity of 5438 backedges. 0 proven. 5151 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2021-11-02 22:48:29,482 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:48:29,482 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256318557] [2021-11-02 22:48:29,482 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1256318557] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:48:29,482 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355218784] [2021-11-02 22:48:29,483 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:48:29,483 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:48:29,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:48:29,484 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:48:29,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-02 22:48:56,365 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:48:56,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:48:56,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 843 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-02 22:48:56,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:48:57,328 INFO L134 CoverageAnalysis]: Checked inductivity of 5438 backedges. 0 proven. 5151 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2021-11-02 22:48:57,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355218784] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:48:57,328 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:48:57,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54] total 56 [2021-11-02 22:48:57,329 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328961841] [2021-11-02 22:48:57,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-02 22:48:57,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:48:57,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-02 22:48:57,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2021-11-02 22:48:57,332 INFO L87 Difference]: Start difference. First operand 320 states and 336 transitions. Second operand has 56 states, 56 states have (on average 3.9107142857142856) internal successors, (219), 55 states have internal predecessors, (219), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:48:57,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:48:57,662 INFO L93 Difference]: Finished difference Result 327 states and 343 transitions. [2021-11-02 22:48:57,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-02 22:48:57,663 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.9107142857142856) internal successors, (219), 55 states have internal predecessors, (219), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 255 [2021-11-02 22:48:57,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:48:57,666 INFO L225 Difference]: With dead ends: 327 [2021-11-02 22:48:57,666 INFO L226 Difference]: Without dead ends: 327 [2021-11-02 22:48:57,667 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 256 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2021-11-02 22:48:57,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2021-11-02 22:48:57,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 324. [2021-11-02 22:48:57,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 324 states, 318 states have (on average 1.059748427672956) internal successors, (337), 320 states have internal predecessors, (337), 2 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) [2021-11-02 22:48:57,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 340 transitions. [2021-11-02 22:48:57,677 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 340 transitions. Word has length 255 [2021-11-02 22:48:57,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:48:57,678 INFO L470 AbstractCegarLoop]: Abstraction has 324 states and 340 transitions. [2021-11-02 22:48:57,678 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 3.9107142857142856) internal successors, (219), 55 states have internal predecessors, (219), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:48:57,678 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 340 transitions. [2021-11-02 22:48:57,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 260 [2021-11-02 22:48:57,681 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:48:57,682 INFO L513 BasicCegarLoop]: trace histogram [52, 52, 52, 52, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:48:57,752 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-02 22:48:57,901 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-02 22:48:57,902 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:48:57,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:48:57,902 INFO L85 PathProgramCache]: Analyzing trace with hash -329648849, now seen corresponding path program 41 times [2021-11-02 22:48:57,902 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:48:57,902 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617360792] [2021-11-02 22:48:57,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:48:57,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:48:57,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:48:59,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:48:59,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:48:59,501 INFO L134 CoverageAnalysis]: Checked inductivity of 5643 backedges. 0 proven. 5356 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2021-11-02 22:48:59,501 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:48:59,501 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617360792] [2021-11-02 22:48:59,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1617360792] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:48:59,502 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2092305482] [2021-11-02 22:48:59,502 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:48:59,502 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:48:59,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:48:59,503 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:48:59,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-02 22:50:38,092 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 53 check-sat command(s) [2021-11-02 22:50:38,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:50:38,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 854 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-02 22:50:38,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:50:38,906 INFO L134 CoverageAnalysis]: Checked inductivity of 5643 backedges. 0 proven. 5356 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2021-11-02 22:50:38,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2092305482] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:50:38,906 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:50:38,906 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55] total 57 [2021-11-02 22:50:38,907 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016068569] [2021-11-02 22:50:38,907 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-02 22:50:38,907 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:38,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-02 22:50:38,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2021-11-02 22:50:38,908 INFO L87 Difference]: Start difference. First operand 324 states and 340 transitions. Second operand has 57 states, 57 states have (on average 3.912280701754386) internal successors, (223), 56 states have internal predecessors, (223), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:50:39,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:39,119 INFO L93 Difference]: Finished difference Result 331 states and 347 transitions. [2021-11-02 22:50:39,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-11-02 22:50:39,120 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 3.912280701754386) internal successors, (223), 56 states have internal predecessors, (223), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 259 [2021-11-02 22:50:39,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:39,121 INFO L225 Difference]: With dead ends: 331 [2021-11-02 22:50:39,122 INFO L226 Difference]: Without dead ends: 331 [2021-11-02 22:50:39,122 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 260 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2021-11-02 22:50:39,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2021-11-02 22:50:39,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 328. [2021-11-02 22:50:39,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 322 states have (on average 1.0590062111801242) internal successors, (341), 324 states have internal predecessors, (341), 2 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) [2021-11-02 22:50:39,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 344 transitions. [2021-11-02 22:50:39,129 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 344 transitions. Word has length 259 [2021-11-02 22:50:39,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:39,130 INFO L470 AbstractCegarLoop]: Abstraction has 328 states and 344 transitions. [2021-11-02 22:50:39,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 3.912280701754386) internal successors, (223), 56 states have internal predecessors, (223), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:50:39,130 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 344 transitions. [2021-11-02 22:50:39,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2021-11-02 22:50:39,133 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:39,133 INFO L513 BasicCegarLoop]: trace histogram [53, 53, 53, 53, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:39,217 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-02 22:50:39,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-02 22:50:39,358 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:50:39,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:39,358 INFO L85 PathProgramCache]: Analyzing trace with hash -425805812, now seen corresponding path program 42 times [2021-11-02 22:50:39,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:39,358 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734827027] [2021-11-02 22:50:39,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:39,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:39,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:40,777 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:50:40,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:40,780 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 0 proven. 5565 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2021-11-02 22:50:40,781 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:40,781 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734827027] [2021-11-02 22:50:40,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [734827027] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:50:40,781 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1102158189] [2021-11-02 22:50:40,781 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:50:40,782 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:50:40,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:50:40,784 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:50:40,785 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-02 22:50:53,469 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 29 check-sat command(s) [2021-11-02 22:50:53,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:50:53,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 590 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-02 22:50:53,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:50:53,515 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:50:55,837 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 209 proven. 287 refuted. 0 times theorem prover too weak. 5356 trivial. 0 not checked. [2021-11-02 22:50:55,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1102158189] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:50:55,837 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:50:55,837 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 21] total 77 [2021-11-02 22:50:55,837 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827050676] [2021-11-02 22:50:55,838 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-02 22:50:55,838 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:55,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-02 22:50:55,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1677, Invalid=4175, Unknown=0, NotChecked=0, Total=5852 [2021-11-02 22:50:55,839 INFO L87 Difference]: Start difference. First operand 328 states and 344 transitions. Second operand has 77 states, 77 states have (on average 3.5844155844155843) internal successors, (276), 76 states have internal predecessors, (276), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:50:59,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:59,512 INFO L93 Difference]: Finished difference Result 345 states and 362 transitions. [2021-11-02 22:50:59,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-02 22:50:59,513 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 3.5844155844155843) internal successors, (276), 76 states have internal predecessors, (276), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 263 [2021-11-02 22:50:59,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:59,515 INFO L225 Difference]: With dead ends: 345 [2021-11-02 22:50:59,515 INFO L226 Difference]: Without dead ends: 345 [2021-11-02 22:50:59,517 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 245 SyntacticMatches, 0 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3742 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=5201, Invalid=16555, Unknown=0, NotChecked=0, Total=21756 [2021-11-02 22:50:59,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 345 states. [2021-11-02 22:50:59,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 345 to 343. [2021-11-02 22:50:59,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 337 states have (on average 1.0593471810089021) internal successors, (357), 339 states have internal predecessors, (357), 2 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) [2021-11-02 22:50:59,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 360 transitions. [2021-11-02 22:50:59,525 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 360 transitions. Word has length 263 [2021-11-02 22:50:59,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:59,525 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 360 transitions. [2021-11-02 22:50:59,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 3.5844155844155843) internal successors, (276), 76 states have internal predecessors, (276), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:50:59,526 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 360 transitions. [2021-11-02 22:50:59,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2021-11-02 22:50:59,528 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:59,528 INFO L513 BasicCegarLoop]: trace histogram [55, 55, 55, 55, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:59,573 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2021-11-02 22:50:59,745 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:50:59,746 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:50:59,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:59,746 INFO L85 PathProgramCache]: Analyzing trace with hash 2044057431, now seen corresponding path program 43 times [2021-11-02 22:50:59,746 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:59,746 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933100823] [2021-11-02 22:50:59,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:59,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:59,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:01,160 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:01,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:01,163 INFO L134 CoverageAnalysis]: Checked inductivity of 6325 backedges. 0 proven. 5995 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-02 22:51:01,163 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:01,163 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933100823] [2021-11-02 22:51:01,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [933100823] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:01,163 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [112163679] [2021-11-02 22:51:01,164 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:51:01,164 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:51:01,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:51:01,165 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:51:01,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-02 22:51:03,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:03,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 904 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-02 22:51:03,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:51:04,644 INFO L134 CoverageAnalysis]: Checked inductivity of 6325 backedges. 0 proven. 5995 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-02 22:51:04,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [112163679] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:04,644 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:51:04,644 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58] total 60 [2021-11-02 22:51:04,644 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652821966] [2021-11-02 22:51:04,645 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-02 22:51:04,645 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:04,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-02 22:51:04,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2021-11-02 22:51:04,646 INFO L87 Difference]: Start difference. First operand 343 states and 360 transitions. Second operand has 60 states, 60 states have (on average 3.9166666666666665) internal successors, (235), 59 states have internal predecessors, (235), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:51:04,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:04,846 INFO L93 Difference]: Finished difference Result 350 states and 367 transitions. [2021-11-02 22:51:04,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-02 22:51:04,846 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 3.9166666666666665) internal successors, (235), 59 states have internal predecessors, (235), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 274 [2021-11-02 22:51:04,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:04,848 INFO L225 Difference]: With dead ends: 350 [2021-11-02 22:51:04,848 INFO L226 Difference]: Without dead ends: 350 [2021-11-02 22:51:04,848 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 275 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2021-11-02 22:51:04,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2021-11-02 22:51:04,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 347. [2021-11-02 22:51:04,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 347 states, 341 states have (on average 1.0586510263929618) internal successors, (361), 343 states have internal predecessors, (361), 2 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) [2021-11-02 22:51:04,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 347 states and 364 transitions. [2021-11-02 22:51:04,854 INFO L78 Accepts]: Start accepts. Automaton has 347 states and 364 transitions. Word has length 274 [2021-11-02 22:51:04,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:04,854 INFO L470 AbstractCegarLoop]: Abstraction has 347 states and 364 transitions. [2021-11-02 22:51:04,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 3.9166666666666665) internal successors, (235), 59 states have internal predecessors, (235), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:51:04,854 INFO L276 IsEmpty]: Start isEmpty. Operand 347 states and 364 transitions. [2021-11-02 22:51:04,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2021-11-02 22:51:04,856 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:04,856 INFO L513 BasicCegarLoop]: trace histogram [56, 56, 56, 56, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:51:04,889 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-02 22:51:05,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:51:05,062 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:51:05,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:05,062 INFO L85 PathProgramCache]: Analyzing trace with hash 1948344026, now seen corresponding path program 44 times [2021-11-02 22:51:05,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:05,062 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [677809426] [2021-11-02 22:51:05,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:05,063 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:05,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:06,518 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:06,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:06,521 INFO L134 CoverageAnalysis]: Checked inductivity of 6546 backedges. 0 proven. 6216 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-02 22:51:06,521 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:06,521 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [677809426] [2021-11-02 22:51:06,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [677809426] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:06,522 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443482446] [2021-11-02 22:51:06,522 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:51:06,522 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:51:06,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:51:06,523 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:51:06,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-02 22:51:09,353 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:51:09,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:51:09,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 915 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-02 22:51:09,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:51:10,110 INFO L134 CoverageAnalysis]: Checked inductivity of 6546 backedges. 0 proven. 6216 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-02 22:51:10,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [443482446] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:10,110 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:51:10,110 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 59] total 61 [2021-11-02 22:51:10,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903790479] [2021-11-02 22:51:10,111 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-02 22:51:10,111 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:10,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-02 22:51:10,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2021-11-02 22:51:10,112 INFO L87 Difference]: Start difference. First operand 347 states and 364 transitions. Second operand has 61 states, 61 states have (on average 3.918032786885246) internal successors, (239), 60 states have internal predecessors, (239), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:51:10,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:10,348 INFO L93 Difference]: Finished difference Result 354 states and 371 transitions. [2021-11-02 22:51:10,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-11-02 22:51:10,349 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 3.918032786885246) internal successors, (239), 60 states have internal predecessors, (239), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 278 [2021-11-02 22:51:10,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:10,351 INFO L225 Difference]: With dead ends: 354 [2021-11-02 22:51:10,351 INFO L226 Difference]: Without dead ends: 354 [2021-11-02 22:51:10,351 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2021-11-02 22:51:10,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2021-11-02 22:51:10,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 351. [2021-11-02 22:51:10,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 351 states, 345 states have (on average 1.0579710144927537) internal successors, (365), 347 states have internal predecessors, (365), 2 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) [2021-11-02 22:51:10,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 368 transitions. [2021-11-02 22:51:10,358 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 368 transitions. Word has length 278 [2021-11-02 22:51:10,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:10,359 INFO L470 AbstractCegarLoop]: Abstraction has 351 states and 368 transitions. [2021-11-02 22:51:10,359 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 3.918032786885246) internal successors, (239), 60 states have internal predecessors, (239), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:51:10,359 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 368 transitions. [2021-11-02 22:51:10,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 283 [2021-11-02 22:51:10,362 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:10,362 INFO L513 BasicCegarLoop]: trace histogram [57, 57, 57, 57, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:51:10,411 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-02 22:51:10,576 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-11-02 22:51:10,576 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:51:10,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:10,577 INFO L85 PathProgramCache]: Analyzing trace with hash -964203299, now seen corresponding path program 45 times [2021-11-02 22:51:10,577 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:10,577 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097764397] [2021-11-02 22:51:10,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:10,577 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:10,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:12,105 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:12,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:12,110 INFO L134 CoverageAnalysis]: Checked inductivity of 6771 backedges. 0 proven. 6441 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-02 22:51:12,110 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:12,110 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097764397] [2021-11-02 22:51:12,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2097764397] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:12,110 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1550367213] [2021-11-02 22:51:12,110 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:51:12,110 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:51:12,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:51:12,114 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:51:12,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-02 22:51:15,240 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-02 22:51:15,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:51:15,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-02 22:51:15,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:51:15,267 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:51:17,671 INFO L134 CoverageAnalysis]: Checked inductivity of 6771 backedges. 225 proven. 330 refuted. 0 times theorem prover too weak. 6216 trivial. 0 not checked. [2021-11-02 22:51:17,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1550367213] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:17,673 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:51:17,673 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 22] total 82 [2021-11-02 22:51:17,673 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551793706] [2021-11-02 22:51:17,674 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-02 22:51:17,674 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:17,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-02 22:51:17,675 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1923, Invalid=4719, Unknown=0, NotChecked=0, Total=6642 [2021-11-02 22:51:17,675 INFO L87 Difference]: Start difference. First operand 351 states and 368 transitions. Second operand has 82 states, 82 states have (on average 3.597560975609756) internal successors, (295), 81 states have internal predecessors, (295), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:51:21,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:21,666 INFO L93 Difference]: Finished difference Result 368 states and 386 transitions. [2021-11-02 22:51:21,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-11-02 22:51:21,667 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 3.597560975609756) internal successors, (295), 81 states have internal predecessors, (295), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 282 [2021-11-02 22:51:21,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:21,669 INFO L225 Difference]: With dead ends: 368 [2021-11-02 22:51:21,669 INFO L226 Difference]: Without dead ends: 368 [2021-11-02 22:51:21,670 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 263 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4258 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=5953, Invalid=18853, Unknown=0, NotChecked=0, Total=24806 [2021-11-02 22:51:21,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 368 states. [2021-11-02 22:51:21,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 368 to 366. [2021-11-02 22:51:21,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 366 states, 360 states have (on average 1.0583333333333333) internal successors, (381), 362 states have internal predecessors, (381), 2 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) [2021-11-02 22:51:21,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 384 transitions. [2021-11-02 22:51:21,678 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 384 transitions. Word has length 282 [2021-11-02 22:51:21,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:21,679 INFO L470 AbstractCegarLoop]: Abstraction has 366 states and 384 transitions. [2021-11-02 22:51:21,679 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 3.597560975609756) internal successors, (295), 81 states have internal predecessors, (295), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:51:21,679 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 384 transitions. [2021-11-02 22:51:21,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2021-11-02 22:51:21,682 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:21,682 INFO L513 BasicCegarLoop]: trace histogram [59, 59, 59, 59, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:51:21,738 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-02 22:51:21,897 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:51:21,898 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:51:21,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:21,898 INFO L85 PathProgramCache]: Analyzing trace with hash 8455194, now seen corresponding path program 46 times [2021-11-02 22:51:21,898 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:21,898 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075639656] [2021-11-02 22:51:21,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:21,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:22,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:23,466 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:23,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:23,469 INFO L134 CoverageAnalysis]: Checked inductivity of 7279 backedges. 0 proven. 6903 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2021-11-02 22:51:23,469 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:23,469 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075639656] [2021-11-02 22:51:23,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2075639656] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:23,469 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1323445684] [2021-11-02 22:51:23,469 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:51:23,470 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:51:23,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:51:23,470 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:51:23,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-02 22:51:34,170 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:51:34,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:51:34,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 965 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-02 22:51:34,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:51:35,046 INFO L134 CoverageAnalysis]: Checked inductivity of 7279 backedges. 0 proven. 6903 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2021-11-02 22:51:35,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1323445684] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:35,046 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:51:35,046 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62] total 64 [2021-11-02 22:51:35,046 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617038595] [2021-11-02 22:51:35,047 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-02 22:51:35,047 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:35,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-02 22:51:35,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1955, Invalid=2077, Unknown=0, NotChecked=0, Total=4032 [2021-11-02 22:51:35,049 INFO L87 Difference]: Start difference. First operand 366 states and 384 transitions. Second operand has 64 states, 64 states have (on average 3.921875) internal successors, (251), 63 states have internal predecessors, (251), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:51:35,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:35,451 INFO L93 Difference]: Finished difference Result 373 states and 391 transitions. [2021-11-02 22:51:35,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-02 22:51:35,452 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 3.921875) internal successors, (251), 63 states have internal predecessors, (251), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 293 [2021-11-02 22:51:35,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:35,454 INFO L225 Difference]: With dead ends: 373 [2021-11-02 22:51:35,455 INFO L226 Difference]: Without dead ends: 373 [2021-11-02 22:51:35,455 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 294 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1955, Invalid=2077, Unknown=0, NotChecked=0, Total=4032 [2021-11-02 22:51:35,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 373 states. [2021-11-02 22:51:35,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 373 to 370. [2021-11-02 22:51:35,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 364 states have (on average 1.0576923076923077) internal successors, (385), 366 states have internal predecessors, (385), 2 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) [2021-11-02 22:51:35,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 388 transitions. [2021-11-02 22:51:35,463 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 388 transitions. Word has length 293 [2021-11-02 22:51:35,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:35,464 INFO L470 AbstractCegarLoop]: Abstraction has 370 states and 388 transitions. [2021-11-02 22:51:35,465 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 3.921875) internal successors, (251), 63 states have internal predecessors, (251), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:51:35,465 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 388 transitions. [2021-11-02 22:51:35,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2021-11-02 22:51:35,468 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:35,468 INFO L513 BasicCegarLoop]: trace histogram [60, 60, 60, 60, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:51:35,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-02 22:51:35,685 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:51:35,686 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:51:35,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:35,686 INFO L85 PathProgramCache]: Analyzing trace with hash 1949487031, now seen corresponding path program 47 times [2021-11-02 22:51:35,686 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:35,686 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170193282] [2021-11-02 22:51:35,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:35,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:35,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:37,430 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:37,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:37,433 INFO L134 CoverageAnalysis]: Checked inductivity of 7516 backedges. 0 proven. 7140 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2021-11-02 22:51:37,433 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:37,433 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170193282] [2021-11-02 22:51:37,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [170193282] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:37,434 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1462848898] [2021-11-02 22:51:37,434 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:51:37,434 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:51:37,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:51:37,435 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:51:37,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-02 22:52:41,852 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 61 check-sat command(s) [2021-11-02 22:52:41,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:52:41,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 976 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-02 22:52:41,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:52:42,664 INFO L134 CoverageAnalysis]: Checked inductivity of 7516 backedges. 0 proven. 7140 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2021-11-02 22:52:42,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1462848898] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:52:42,664 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:52:42,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 63] total 65 [2021-11-02 22:52:42,665 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428688246] [2021-11-02 22:52:42,665 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-02 22:52:42,665 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:52:42,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-02 22:52:42,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2018, Invalid=2142, Unknown=0, NotChecked=0, Total=4160 [2021-11-02 22:52:42,667 INFO L87 Difference]: Start difference. First operand 370 states and 388 transitions. Second operand has 65 states, 65 states have (on average 3.923076923076923) internal successors, (255), 64 states have internal predecessors, (255), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:52:42,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:52:42,876 INFO L93 Difference]: Finished difference Result 377 states and 395 transitions. [2021-11-02 22:52:42,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-02 22:52:42,877 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.923076923076923) internal successors, (255), 64 states have internal predecessors, (255), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 297 [2021-11-02 22:52:42,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:52:42,878 INFO L225 Difference]: With dead ends: 377 [2021-11-02 22:52:42,878 INFO L226 Difference]: Without dead ends: 377 [2021-11-02 22:52:42,879 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 298 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2018, Invalid=2142, Unknown=0, NotChecked=0, Total=4160 [2021-11-02 22:52:42,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2021-11-02 22:52:42,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 374. [2021-11-02 22:52:42,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 374 states, 368 states have (on average 1.0570652173913044) internal successors, (389), 370 states have internal predecessors, (389), 2 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) [2021-11-02 22:52:42,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 392 transitions. [2021-11-02 22:52:42,884 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 392 transitions. Word has length 297 [2021-11-02 22:52:42,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:52:42,884 INFO L470 AbstractCegarLoop]: Abstraction has 374 states and 392 transitions. [2021-11-02 22:52:42,884 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 3.923076923076923) internal successors, (255), 64 states have internal predecessors, (255), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:52:42,884 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 392 transitions. [2021-11-02 22:52:42,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 302 [2021-11-02 22:52:42,886 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:52:42,887 INFO L513 BasicCegarLoop]: trace histogram [61, 61, 61, 61, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:52:42,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-02 22:52:43,100 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-11-02 22:52:43,100 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:52:43,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:52:43,100 INFO L85 PathProgramCache]: Analyzing trace with hash -592739116, now seen corresponding path program 48 times [2021-11-02 22:52:43,100 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:52:43,100 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824792853] [2021-11-02 22:52:43,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:52:43,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:52:43,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:52:44,785 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:52:44,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:52:44,788 INFO L134 CoverageAnalysis]: Checked inductivity of 7757 backedges. 0 proven. 7381 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2021-11-02 22:52:44,788 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:52:44,788 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824792853] [2021-11-02 22:52:44,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [824792853] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:52:44,788 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2023264607] [2021-11-02 22:52:44,788 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:52:44,788 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:52:44,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:52:44,789 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:52:44,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-02 22:53:01,515 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 33 check-sat command(s) [2021-11-02 22:53:01,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:53:01,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 668 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-02 22:53:01,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:01,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:53:03,861 INFO L134 CoverageAnalysis]: Checked inductivity of 7757 backedges. 241 proven. 376 refuted. 0 times theorem prover too weak. 7140 trivial. 0 not checked. [2021-11-02 22:53:03,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2023264607] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:03,862 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:03,862 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 23] total 87 [2021-11-02 22:53:03,862 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087848341] [2021-11-02 22:53:03,862 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-02 22:53:03,863 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:03,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-02 22:53:03,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2186, Invalid=5296, Unknown=0, NotChecked=0, Total=7482 [2021-11-02 22:53:03,864 INFO L87 Difference]: Start difference. First operand 374 states and 392 transitions. Second operand has 87 states, 87 states have (on average 3.6091954022988504) internal successors, (314), 86 states have internal predecessors, (314), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:53:07,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:07,700 INFO L93 Difference]: Finished difference Result 391 states and 410 transitions. [2021-11-02 22:53:07,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-11-02 22:53:07,701 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 3.6091954022988504) internal successors, (314), 86 states have internal predecessors, (314), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 301 [2021-11-02 22:53:07,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:07,703 INFO L225 Difference]: With dead ends: 391 [2021-11-02 22:53:07,703 INFO L226 Difference]: Without dead ends: 391 [2021-11-02 22:53:07,705 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 447 GetRequests, 281 SyntacticMatches, 0 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4807 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=6756, Invalid=21300, Unknown=0, NotChecked=0, Total=28056 [2021-11-02 22:53:07,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2021-11-02 22:53:07,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 389. [2021-11-02 22:53:07,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 389 states, 383 states have (on average 1.0574412532637076) internal successors, (405), 385 states have internal predecessors, (405), 2 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) [2021-11-02 22:53:07,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 389 states to 389 states and 408 transitions. [2021-11-02 22:53:07,711 INFO L78 Accepts]: Start accepts. Automaton has 389 states and 408 transitions. Word has length 301 [2021-11-02 22:53:07,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:07,712 INFO L470 AbstractCegarLoop]: Abstraction has 389 states and 408 transitions. [2021-11-02 22:53:07,712 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 3.6091954022988504) internal successors, (314), 86 states have internal predecessors, (314), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:53:07,712 INFO L276 IsEmpty]: Start isEmpty. Operand 389 states and 408 transitions. [2021-11-02 22:53:07,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 313 [2021-11-02 22:53:07,714 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:07,715 INFO L513 BasicCegarLoop]: trace histogram [63, 63, 63, 63, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:07,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:07,933 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-11-02 22:53:07,934 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:53:07,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:07,934 INFO L85 PathProgramCache]: Analyzing trace with hash -886202097, now seen corresponding path program 49 times [2021-11-02 22:53:07,934 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:07,934 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241986711] [2021-11-02 22:53:07,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:07,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:08,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:09,823 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:09,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:09,826 INFO L134 CoverageAnalysis]: Checked inductivity of 8300 backedges. 0 proven. 7875 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2021-11-02 22:53:09,826 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:09,826 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241986711] [2021-11-02 22:53:09,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [241986711] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:09,826 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [642041704] [2021-11-02 22:53:09,826 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:53:09,826 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:09,827 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:09,827 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:09,828 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-02 22:53:12,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:12,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 1026 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-02 22:53:12,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:13,650 INFO L134 CoverageAnalysis]: Checked inductivity of 8300 backedges. 0 proven. 7875 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2021-11-02 22:53:13,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [642041704] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:13,651 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:13,651 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 66] total 68 [2021-11-02 22:53:13,651 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658634363] [2021-11-02 22:53:13,651 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-02 22:53:13,651 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:13,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-02 22:53:13,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2213, Invalid=2343, Unknown=0, NotChecked=0, Total=4556 [2021-11-02 22:53:13,652 INFO L87 Difference]: Start difference. First operand 389 states and 408 transitions. Second operand has 68 states, 68 states have (on average 3.926470588235294) internal successors, (267), 67 states have internal predecessors, (267), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:53:13,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:13,870 INFO L93 Difference]: Finished difference Result 396 states and 415 transitions. [2021-11-02 22:53:13,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-11-02 22:53:13,870 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 3.926470588235294) internal successors, (267), 67 states have internal predecessors, (267), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 312 [2021-11-02 22:53:13,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:13,872 INFO L225 Difference]: With dead ends: 396 [2021-11-02 22:53:13,872 INFO L226 Difference]: Without dead ends: 396 [2021-11-02 22:53:13,872 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 313 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2213, Invalid=2343, Unknown=0, NotChecked=0, Total=4556 [2021-11-02 22:53:13,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 396 states. [2021-11-02 22:53:13,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 396 to 393. [2021-11-02 22:53:13,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 393 states, 387 states have (on average 1.0568475452196382) internal successors, (409), 389 states have internal predecessors, (409), 2 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) [2021-11-02 22:53:13,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 393 states to 393 states and 412 transitions. [2021-11-02 22:53:13,876 INFO L78 Accepts]: Start accepts. Automaton has 393 states and 412 transitions. Word has length 312 [2021-11-02 22:53:13,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:13,876 INFO L470 AbstractCegarLoop]: Abstraction has 393 states and 412 transitions. [2021-11-02 22:53:13,877 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 3.926470588235294) internal successors, (267), 67 states have internal predecessors, (267), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:53:13,877 INFO L276 IsEmpty]: Start isEmpty. Operand 393 states and 412 transitions. [2021-11-02 22:53:13,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2021-11-02 22:53:13,879 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:13,879 INFO L513 BasicCegarLoop]: trace histogram [64, 64, 64, 64, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:13,910 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2021-11-02 22:53:14,085 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-11-02 22:53:14,086 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:53:14,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:14,086 INFO L85 PathProgramCache]: Analyzing trace with hash 320499282, now seen corresponding path program 50 times [2021-11-02 22:53:14,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:14,086 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1706289343] [2021-11-02 22:53:14,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:14,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:14,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:15,710 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:15,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:15,713 INFO L134 CoverageAnalysis]: Checked inductivity of 8553 backedges. 0 proven. 8128 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2021-11-02 22:53:15,713 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:15,713 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1706289343] [2021-11-02 22:53:15,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1706289343] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:15,714 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [863497453] [2021-11-02 22:53:15,714 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:53:15,714 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:15,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:15,714 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:15,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-02 22:53:18,991 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:53:18,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:53:18,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 1037 conjuncts, 66 conjunts are in the unsatisfiable core [2021-11-02 22:53:18,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:19,740 INFO L134 CoverageAnalysis]: Checked inductivity of 8553 backedges. 0 proven. 8128 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2021-11-02 22:53:19,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [863497453] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:19,741 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:19,741 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 67] total 69 [2021-11-02 22:53:19,741 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458702496] [2021-11-02 22:53:19,742 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-02 22:53:19,742 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:19,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-02 22:53:19,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2280, Invalid=2412, Unknown=0, NotChecked=0, Total=4692 [2021-11-02 22:53:19,743 INFO L87 Difference]: Start difference. First operand 393 states and 412 transitions. Second operand has 69 states, 69 states have (on average 3.927536231884058) internal successors, (271), 68 states have internal predecessors, (271), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:53:19,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:19,983 INFO L93 Difference]: Finished difference Result 400 states and 419 transitions. [2021-11-02 22:53:19,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-11-02 22:53:19,983 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 3.927536231884058) internal successors, (271), 68 states have internal predecessors, (271), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 316 [2021-11-02 22:53:19,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:19,985 INFO L225 Difference]: With dead ends: 400 [2021-11-02 22:53:19,985 INFO L226 Difference]: Without dead ends: 400 [2021-11-02 22:53:19,985 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 317 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2280, Invalid=2412, Unknown=0, NotChecked=0, Total=4692 [2021-11-02 22:53:19,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2021-11-02 22:53:19,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 397. [2021-11-02 22:53:19,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 397 states, 391 states have (on average 1.0562659846547315) internal successors, (413), 393 states have internal predecessors, (413), 2 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) [2021-11-02 22:53:19,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 416 transitions. [2021-11-02 22:53:19,991 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 416 transitions. Word has length 316 [2021-11-02 22:53:19,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:19,991 INFO L470 AbstractCegarLoop]: Abstraction has 397 states and 416 transitions. [2021-11-02 22:53:19,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 3.927536231884058) internal successors, (271), 68 states have internal predecessors, (271), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:53:19,992 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 416 transitions. [2021-11-02 22:53:19,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2021-11-02 22:53:19,994 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:19,994 INFO L513 BasicCegarLoop]: trace histogram [65, 65, 65, 65, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:20,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:20,217 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-02 22:53:20,218 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:53:20,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:20,218 INFO L85 PathProgramCache]: Analyzing trace with hash -779558379, now seen corresponding path program 51 times [2021-11-02 22:53:20,218 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:20,218 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214572484] [2021-11-02 22:53:20,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:20,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:20,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:21,915 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:21,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:21,918 INFO L134 CoverageAnalysis]: Checked inductivity of 8810 backedges. 0 proven. 8385 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2021-11-02 22:53:21,919 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:21,919 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214572484] [2021-11-02 22:53:21,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1214572484] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:21,919 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [220530534] [2021-11-02 22:53:21,919 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:53:21,919 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:21,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:21,920 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:21,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-02 22:53:25,533 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-02 22:53:25,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:53:25,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 520 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-02 22:53:25,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:25,556 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:53:27,947 INFO L134 CoverageAnalysis]: Checked inductivity of 8810 backedges. 0 proven. 425 refuted. 0 times theorem prover too weak. 8385 trivial. 0 not checked. [2021-11-02 22:53:27,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [220530534] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:27,948 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:27,948 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 22] total 90 [2021-11-02 22:53:27,948 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039543985] [2021-11-02 22:53:27,948 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 90 states [2021-11-02 22:53:27,948 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:27,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2021-11-02 22:53:27,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2459, Invalid=5551, Unknown=0, NotChecked=0, Total=8010 [2021-11-02 22:53:27,950 INFO L87 Difference]: Start difference. First operand 397 states and 416 transitions. Second operand has 90 states, 90 states have (on average 3.6555555555555554) internal successors, (329), 89 states have internal predecessors, (329), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:53:31,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:31,786 INFO L93 Difference]: Finished difference Result 413 states and 433 transitions. [2021-11-02 22:53:31,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-11-02 22:53:31,786 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 90 states have (on average 3.6555555555555554) internal successors, (329), 89 states have internal predecessors, (329), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 320 [2021-11-02 22:53:31,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:31,791 INFO L225 Difference]: With dead ends: 413 [2021-11-02 22:53:31,792 INFO L226 Difference]: Without dead ends: 413 [2021-11-02 22:53:31,794 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 301 SyntacticMatches, 0 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5199 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=7451, Invalid=23349, Unknown=0, NotChecked=0, Total=30800 [2021-11-02 22:53:31,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2021-11-02 22:53:31,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 408. [2021-11-02 22:53:31,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 408 states, 402 states have (on average 1.0572139303482586) internal successors, (425), 404 states have internal predecessors, (425), 2 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) [2021-11-02 22:53:31,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 428 transitions. [2021-11-02 22:53:31,801 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 428 transitions. Word has length 320 [2021-11-02 22:53:31,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:31,801 INFO L470 AbstractCegarLoop]: Abstraction has 408 states and 428 transitions. [2021-11-02 22:53:31,802 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 90 states, 90 states have (on average 3.6555555555555554) internal successors, (329), 89 states have internal predecessors, (329), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:53:31,802 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 428 transitions. [2021-11-02 22:53:31,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2021-11-02 22:53:31,804 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:31,804 INFO L513 BasicCegarLoop]: trace histogram [66, 66, 66, 66, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:31,856 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:32,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:32,025 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:53:32,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:32,025 INFO L85 PathProgramCache]: Analyzing trace with hash -641965051, now seen corresponding path program 52 times [2021-11-02 22:53:32,025 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:32,025 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47867800] [2021-11-02 22:53:32,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:32,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:32,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:33,750 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:33,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:33,753 INFO L134 CoverageAnalysis]: Checked inductivity of 9123 backedges. 0 proven. 8646 refuted. 0 times theorem prover too weak. 477 trivial. 0 not checked. [2021-11-02 22:53:33,754 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:33,754 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47867800] [2021-11-02 22:53:33,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [47867800] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:33,754 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1281747331] [2021-11-02 22:53:33,754 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:53:33,754 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:33,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:33,755 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:33,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-02 22:53:45,513 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:53:45,513 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:53:45,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 1076 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-02 22:53:45,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:53:46,312 INFO L134 CoverageAnalysis]: Checked inductivity of 9123 backedges. 0 proven. 8646 refuted. 0 times theorem prover too weak. 477 trivial. 0 not checked. [2021-11-02 22:53:46,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1281747331] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:46,312 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:53:46,312 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 69] total 71 [2021-11-02 22:53:46,313 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542548814] [2021-11-02 22:53:46,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-02 22:53:46,313 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:53:46,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-02 22:53:46,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2417, Invalid=2553, Unknown=0, NotChecked=0, Total=4970 [2021-11-02 22:53:46,314 INFO L87 Difference]: Start difference. First operand 408 states and 428 transitions. Second operand has 71 states, 71 states have (on average 3.9295774647887325) internal successors, (279), 70 states have internal predecessors, (279), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:53:46,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:53:46,555 INFO L93 Difference]: Finished difference Result 415 states and 435 transitions. [2021-11-02 22:53:46,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-02 22:53:46,555 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.9295774647887325) internal successors, (279), 70 states have internal predecessors, (279), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 327 [2021-11-02 22:53:46,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:53:46,557 INFO L225 Difference]: With dead ends: 415 [2021-11-02 22:53:46,557 INFO L226 Difference]: Without dead ends: 415 [2021-11-02 22:53:46,557 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 328 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2417, Invalid=2553, Unknown=0, NotChecked=0, Total=4970 [2021-11-02 22:53:46,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 415 states. [2021-11-02 22:53:46,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 415 to 412. [2021-11-02 22:53:46,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 412 states, 406 states have (on average 1.0566502463054188) internal successors, (429), 408 states have internal predecessors, (429), 2 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) [2021-11-02 22:53:46,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 432 transitions. [2021-11-02 22:53:46,563 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 432 transitions. Word has length 327 [2021-11-02 22:53:46,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:53:46,563 INFO L470 AbstractCegarLoop]: Abstraction has 412 states and 432 transitions. [2021-11-02 22:53:46,563 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 3.9295774647887325) internal successors, (279), 70 states have internal predecessors, (279), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:53:46,564 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 432 transitions. [2021-11-02 22:53:46,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 332 [2021-11-02 22:53:46,567 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:53:46,567 INFO L513 BasicCegarLoop]: trace histogram [67, 67, 67, 67, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:53:46,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-02 22:53:46,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:46,782 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:53:46,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:53:46,782 INFO L85 PathProgramCache]: Analyzing trace with hash 338233442, now seen corresponding path program 53 times [2021-11-02 22:53:46,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:53:46,782 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [428451180] [2021-11-02 22:53:46,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:53:46,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:53:46,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:48,709 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:53:48,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:53:48,713 INFO L134 CoverageAnalysis]: Checked inductivity of 9388 backedges. 0 proven. 8911 refuted. 0 times theorem prover too weak. 477 trivial. 0 not checked. [2021-11-02 22:53:48,713 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:53:48,713 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [428451180] [2021-11-02 22:53:48,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [428451180] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:53:48,714 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [625201492] [2021-11-02 22:53:48,714 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:53:48,714 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:53:48,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:53:48,715 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:53:48,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-02 22:56:11,885 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 68 check-sat command(s) [2021-11-02 22:56:11,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:56:12,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 1087 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-02 22:56:12,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:56:12,852 INFO L134 CoverageAnalysis]: Checked inductivity of 9388 backedges. 0 proven. 8911 refuted. 0 times theorem prover too weak. 477 trivial. 0 not checked. [2021-11-02 22:56:12,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [625201492] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:56:12,852 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:56:12,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70] total 72 [2021-11-02 22:56:12,853 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329591442] [2021-11-02 22:56:12,853 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-02 22:56:12,853 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:56:12,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-02 22:56:12,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2487, Invalid=2625, Unknown=0, NotChecked=0, Total=5112 [2021-11-02 22:56:12,854 INFO L87 Difference]: Start difference. First operand 412 states and 432 transitions. Second operand has 72 states, 72 states have (on average 3.9305555555555554) internal successors, (283), 71 states have internal predecessors, (283), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:56:13,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:56:13,108 INFO L93 Difference]: Finished difference Result 419 states and 439 transitions. [2021-11-02 22:56:13,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-02 22:56:13,108 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 3.9305555555555554) internal successors, (283), 71 states have internal predecessors, (283), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 331 [2021-11-02 22:56:13,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:56:13,110 INFO L225 Difference]: With dead ends: 419 [2021-11-02 22:56:13,110 INFO L226 Difference]: Without dead ends: 419 [2021-11-02 22:56:13,111 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 332 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2487, Invalid=2625, Unknown=0, NotChecked=0, Total=5112 [2021-11-02 22:56:13,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2021-11-02 22:56:13,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 416. [2021-11-02 22:56:13,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 416 states, 410 states have (on average 1.0560975609756098) internal successors, (433), 412 states have internal predecessors, (433), 2 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) [2021-11-02 22:56:13,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 416 states to 416 states and 436 transitions. [2021-11-02 22:56:13,116 INFO L78 Accepts]: Start accepts. Automaton has 416 states and 436 transitions. Word has length 331 [2021-11-02 22:56:13,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:56:13,116 INFO L470 AbstractCegarLoop]: Abstraction has 416 states and 436 transitions. [2021-11-02 22:56:13,116 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 3.9305555555555554) internal successors, (283), 71 states have internal predecessors, (283), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:56:13,116 INFO L276 IsEmpty]: Start isEmpty. Operand 416 states and 436 transitions. [2021-11-02 22:56:13,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2021-11-02 22:56:13,119 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:56:13,119 INFO L513 BasicCegarLoop]: trace histogram [68, 68, 68, 68, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:56:13,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-02 22:56:13,333 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:56:13,334 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:56:13,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:56:13,334 INFO L85 PathProgramCache]: Analyzing trace with hash 1153578559, now seen corresponding path program 54 times [2021-11-02 22:56:13,334 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:56:13,334 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1853983367] [2021-11-02 22:56:13,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:56:13,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:56:13,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:56:15,183 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:56:15,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:56:15,186 INFO L134 CoverageAnalysis]: Checked inductivity of 9657 backedges. 0 proven. 9180 refuted. 0 times theorem prover too weak. 477 trivial. 0 not checked. [2021-11-02 22:56:15,186 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:56:15,186 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1853983367] [2021-11-02 22:56:15,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1853983367] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:56:15,186 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1634622323] [2021-11-02 22:56:15,186 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:56:15,187 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:56:15,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:56:15,196 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:56:15,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-02 22:56:40,442 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 37 check-sat command(s) [2021-11-02 22:56:40,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:56:40,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 746 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-02 22:56:40,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:56:40,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:56:43,073 INFO L134 CoverageAnalysis]: Checked inductivity of 9657 backedges. 269 proven. 477 refuted. 0 times theorem prover too weak. 8911 trivial. 0 not checked. [2021-11-02 22:56:43,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1634622323] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:56:43,073 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:56:43,074 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 25] total 96 [2021-11-02 22:56:43,074 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212249250] [2021-11-02 22:56:43,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2021-11-02 22:56:43,074 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:56:43,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-11-02 22:56:43,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2692, Invalid=6428, Unknown=0, NotChecked=0, Total=9120 [2021-11-02 22:56:43,076 INFO L87 Difference]: Start difference. First operand 416 states and 436 transitions. Second operand has 96 states, 96 states have (on average 3.625) internal successors, (348), 95 states have internal predecessors, (348), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:56:47,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:56:47,694 INFO L93 Difference]: Finished difference Result 433 states and 454 transitions. [2021-11-02 22:56:47,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2021-11-02 22:56:47,695 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 96 states have (on average 3.625) internal successors, (348), 95 states have internal predecessors, (348), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 335 [2021-11-02 22:56:47,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:56:47,697 INFO L225 Difference]: With dead ends: 433 [2021-11-02 22:56:47,697 INFO L226 Difference]: Without dead ends: 433 [2021-11-02 22:56:47,698 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 497 GetRequests, 313 SyntacticMatches, 0 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5888 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=8300, Invalid=26110, Unknown=0, NotChecked=0, Total=34410 [2021-11-02 22:56:47,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2021-11-02 22:56:47,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 431. [2021-11-02 22:56:47,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 431 states, 425 states have (on average 1.056470588235294) internal successors, (449), 427 states have internal predecessors, (449), 2 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) [2021-11-02 22:56:47,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 452 transitions. [2021-11-02 22:56:47,702 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 452 transitions. Word has length 335 [2021-11-02 22:56:47,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:56:47,702 INFO L470 AbstractCegarLoop]: Abstraction has 431 states and 452 transitions. [2021-11-02 22:56:47,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 96 states have (on average 3.625) internal successors, (348), 95 states have internal predecessors, (348), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:56:47,702 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 452 transitions. [2021-11-02 22:56:47,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2021-11-02 22:56:47,705 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:56:47,705 INFO L513 BasicCegarLoop]: trace histogram [70, 70, 70, 70, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:56:47,766 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2021-11-02 22:56:47,929 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:56:47,930 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:56:47,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:56:47,930 INFO L85 PathProgramCache]: Analyzing trace with hash -328682940, now seen corresponding path program 55 times [2021-11-02 22:56:47,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:56:47,930 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352748269] [2021-11-02 22:56:47,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:56:47,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:56:48,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:56:49,869 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:56:49,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:56:49,874 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 0 proven. 9730 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2021-11-02 22:56:49,874 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:56:49,875 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352748269] [2021-11-02 22:56:49,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1352748269] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:56:49,875 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2088734188] [2021-11-02 22:56:49,875 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:56:49,875 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:56:49,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:56:49,877 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:56:49,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-02 22:56:53,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:56:53,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 1137 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-02 22:56:53,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:56:54,604 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 0 proven. 9730 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2021-11-02 22:56:54,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2088734188] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:56:54,605 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:56:54,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 73] total 75 [2021-11-02 22:56:54,605 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840556626] [2021-11-02 22:56:54,606 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2021-11-02 22:56:54,606 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:56:54,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-11-02 22:56:54,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2703, Invalid=2847, Unknown=0, NotChecked=0, Total=5550 [2021-11-02 22:56:54,607 INFO L87 Difference]: Start difference. First operand 431 states and 452 transitions. Second operand has 75 states, 75 states have (on average 3.933333333333333) internal successors, (295), 74 states have internal predecessors, (295), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:56:54,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:56:54,865 INFO L93 Difference]: Finished difference Result 438 states and 459 transitions. [2021-11-02 22:56:54,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-11-02 22:56:54,865 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 3.933333333333333) internal successors, (295), 74 states have internal predecessors, (295), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 346 [2021-11-02 22:56:54,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:56:54,867 INFO L225 Difference]: With dead ends: 438 [2021-11-02 22:56:54,867 INFO L226 Difference]: Without dead ends: 438 [2021-11-02 22:56:54,868 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 420 GetRequests, 347 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2703, Invalid=2847, Unknown=0, NotChecked=0, Total=5550 [2021-11-02 22:56:54,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 438 states. [2021-11-02 22:56:54,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 438 to 435. [2021-11-02 22:56:54,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 435 states, 429 states have (on average 1.055944055944056) internal successors, (453), 431 states have internal predecessors, (453), 2 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) [2021-11-02 22:56:54,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 456 transitions. [2021-11-02 22:56:54,872 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 456 transitions. Word has length 346 [2021-11-02 22:56:54,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:56:54,873 INFO L470 AbstractCegarLoop]: Abstraction has 435 states and 456 transitions. [2021-11-02 22:56:54,873 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 3.933333333333333) internal successors, (295), 74 states have internal predecessors, (295), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:56:54,873 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 456 transitions. [2021-11-02 22:56:54,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 351 [2021-11-02 22:56:54,875 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:56:54,876 INFO L513 BasicCegarLoop]: trace histogram [71, 71, 71, 71, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:56:54,920 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2021-11-02 22:56:55,101 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:56:55,102 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:56:55,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:56:55,102 INFO L85 PathProgramCache]: Analyzing trace with hash -1248039225, now seen corresponding path program 56 times [2021-11-02 22:56:55,102 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:56:55,102 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [620866452] [2021-11-02 22:56:55,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:56:55,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:56:55,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:56:57,239 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:56:57,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:56:57,242 INFO L134 CoverageAnalysis]: Checked inductivity of 10543 backedges. 0 proven. 10011 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2021-11-02 22:56:57,242 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:56:57,242 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [620866452] [2021-11-02 22:56:57,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [620866452] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:56:57,246 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1972495796] [2021-11-02 22:56:57,246 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:56:57,246 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:56:57,246 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:56:57,247 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:56:57,248 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-02 22:57:01,245 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:57:01,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:57:01,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 1148 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-02 22:57:01,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:57:02,043 INFO L134 CoverageAnalysis]: Checked inductivity of 10543 backedges. 0 proven. 10011 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2021-11-02 22:57:02,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1972495796] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:57:02,043 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:57:02,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 74] total 76 [2021-11-02 22:57:02,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156010140] [2021-11-02 22:57:02,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2021-11-02 22:57:02,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:57:02,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-11-02 22:57:02,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2777, Invalid=2923, Unknown=0, NotChecked=0, Total=5700 [2021-11-02 22:57:02,045 INFO L87 Difference]: Start difference. First operand 435 states and 456 transitions. Second operand has 76 states, 76 states have (on average 3.9342105263157894) internal successors, (299), 75 states have internal predecessors, (299), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:57:02,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:57:02,324 INFO L93 Difference]: Finished difference Result 442 states and 463 transitions. [2021-11-02 22:57:02,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-11-02 22:57:02,324 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 3.9342105263157894) internal successors, (299), 75 states have internal predecessors, (299), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 350 [2021-11-02 22:57:02,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:57:02,326 INFO L225 Difference]: With dead ends: 442 [2021-11-02 22:57:02,326 INFO L226 Difference]: Without dead ends: 442 [2021-11-02 22:57:02,327 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 351 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2777, Invalid=2923, Unknown=0, NotChecked=0, Total=5700 [2021-11-02 22:57:02,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2021-11-02 22:57:02,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 439. [2021-11-02 22:57:02,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 439 states, 433 states have (on average 1.0554272517321017) internal successors, (457), 435 states have internal predecessors, (457), 2 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) [2021-11-02 22:57:02,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 439 states to 439 states and 460 transitions. [2021-11-02 22:57:02,331 INFO L78 Accepts]: Start accepts. Automaton has 439 states and 460 transitions. Word has length 350 [2021-11-02 22:57:02,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:57:02,332 INFO L470 AbstractCegarLoop]: Abstraction has 439 states and 460 transitions. [2021-11-02 22:57:02,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 3.9342105263157894) internal successors, (299), 75 states have internal predecessors, (299), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:57:02,332 INFO L276 IsEmpty]: Start isEmpty. Operand 439 states and 460 transitions. [2021-11-02 22:57:02,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 355 [2021-11-02 22:57:02,333 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:57:02,334 INFO L513 BasicCegarLoop]: trace histogram [72, 72, 72, 72, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:57:02,367 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2021-11-02 22:57:02,534 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2021-11-02 22:57:02,534 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:57:02,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:57:02,534 INFO L85 PathProgramCache]: Analyzing trace with hash 231223754, now seen corresponding path program 57 times [2021-11-02 22:57:02,534 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:57:02,535 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178011315] [2021-11-02 22:57:02,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:57:02,535 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:57:02,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:04,636 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:57:04,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:04,640 INFO L134 CoverageAnalysis]: Checked inductivity of 10828 backedges. 0 proven. 10296 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2021-11-02 22:57:04,640 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:57:04,640 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178011315] [2021-11-02 22:57:04,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1178011315] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:57:04,640 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [106144213] [2021-11-02 22:57:04,641 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:57:04,641 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:57:04,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:57:04,643 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:57:04,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-02 22:57:09,234 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2021-11-02 22:57:09,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:57:09,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 576 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-02 22:57:09,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:57:09,327 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:57:12,135 INFO L134 CoverageAnalysis]: Checked inductivity of 10828 backedges. 285 proven. 532 refuted. 0 times theorem prover too weak. 10011 trivial. 0 not checked. [2021-11-02 22:57:12,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [106144213] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:57:12,136 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:57:12,136 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 26] total 101 [2021-11-02 22:57:12,136 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636312566] [2021-11-02 22:57:12,137 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2021-11-02 22:57:12,137 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:57:12,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2021-11-02 22:57:12,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3002, Invalid=7098, Unknown=0, NotChecked=0, Total=10100 [2021-11-02 22:57:12,139 INFO L87 Difference]: Start difference. First operand 439 states and 460 transitions. Second operand has 101 states, 101 states have (on average 3.633663366336634) internal successors, (367), 100 states have internal predecessors, (367), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:57:17,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:57:17,290 INFO L93 Difference]: Finished difference Result 456 states and 478 transitions. [2021-11-02 22:57:17,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-02 22:57:17,290 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 3.633663366336634) internal successors, (367), 100 states have internal predecessors, (367), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 354 [2021-11-02 22:57:17,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:57:17,292 INFO L225 Difference]: With dead ends: 456 [2021-11-02 22:57:17,292 INFO L226 Difference]: Without dead ends: 456 [2021-11-02 22:57:17,294 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 525 GetRequests, 331 SyntacticMatches, 0 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6530 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=9244, Invalid=28976, Unknown=0, NotChecked=0, Total=38220 [2021-11-02 22:57:17,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 456 states. [2021-11-02 22:57:17,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 456 to 454. [2021-11-02 22:57:17,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 454 states, 448 states have (on average 1.0558035714285714) internal successors, (473), 450 states have internal predecessors, (473), 2 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) [2021-11-02 22:57:17,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 454 states to 454 states and 476 transitions. [2021-11-02 22:57:17,299 INFO L78 Accepts]: Start accepts. Automaton has 454 states and 476 transitions. Word has length 354 [2021-11-02 22:57:17,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:57:17,300 INFO L470 AbstractCegarLoop]: Abstraction has 454 states and 476 transitions. [2021-11-02 22:57:17,300 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 3.633663366336634) internal successors, (367), 100 states have internal predecessors, (367), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:57:17,300 INFO L276 IsEmpty]: Start isEmpty. Operand 454 states and 476 transitions. [2021-11-02 22:57:17,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2021-11-02 22:57:17,302 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:57:17,302 INFO L513 BasicCegarLoop]: trace histogram [74, 74, 74, 74, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:57:17,336 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Ended with exit code 0 [2021-11-02 22:57:17,502 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable65 [2021-11-02 22:57:17,503 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 7 more)] === [2021-11-02 22:57:17,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:57:17,503 INFO L85 PathProgramCache]: Analyzing trace with hash -1725869555, now seen corresponding path program 58 times [2021-11-02 22:57:17,503 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:57:17,503 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436065243] [2021-11-02 22:57:17,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:57:17,504 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:57:17,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:19,617 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:57:19,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:57:19,621 INFO L134 CoverageAnalysis]: Checked inductivity of 11468 backedges. 0 proven. 10878 refuted. 0 times theorem prover too weak. 590 trivial. 0 not checked. [2021-11-02 22:57:19,621 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:57:19,621 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436065243] [2021-11-02 22:57:19,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [436065243] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:57:19,621 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1028476381] [2021-11-02 22:57:19,621 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:57:19,621 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:57:19,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:57:19,622 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:57:19,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c5089ca-9347-42bc-881d-53f1a2bb6f81/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process