./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/reducercommutativity/sep10-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/config/AutomizerReach.xml -i ../../sv-benchmarks/c/reducercommutativity/sep10-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 246513a49efb434b9c960a67f526057a6e0f9037478ee43a300fa4a565ea6e54 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 06:19:16,540 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 06:19:16,543 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 06:19:16,590 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 06:19:16,591 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 06:19:16,592 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 06:19:16,595 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 06:19:16,598 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 06:19:16,600 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 06:19:16,602 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 06:19:16,603 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 06:19:16,605 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 06:19:16,606 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 06:19:16,608 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 06:19:16,610 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 06:19:16,612 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 06:19:16,613 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 06:19:16,614 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 06:19:16,617 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 06:19:16,620 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 06:19:16,622 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 06:19:16,624 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 06:19:16,626 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 06:19:16,627 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 06:19:16,632 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 06:19:16,633 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 06:19:16,634 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 06:19:16,635 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 06:19:16,636 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 06:19:16,638 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 06:19:16,638 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 06:19:16,640 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 06:19:16,641 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 06:19:16,642 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 06:19:16,644 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 06:19:16,644 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 06:19:16,645 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 06:19:16,646 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 06:19:16,646 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 06:19:16,648 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 06:19:16,649 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 06:19:16,650 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-20 06:19:16,683 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 06:19:16,683 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 06:19:16,684 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 06:19:16,684 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 06:19:16,685 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 06:19:16,685 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 06:19:16,686 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-20 06:19:16,686 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-20 06:19:16,687 INFO L138 SettingsManager]: * Use SBE=true [2021-11-20 06:19:16,687 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 06:19:16,687 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 06:19:16,688 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 06:19:16,688 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 06:19:16,688 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 06:19:16,688 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 06:19:16,689 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 06:19:16,689 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 06:19:16,689 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 06:19:16,689 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 06:19:16,690 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 06:19:16,690 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 06:19:16,690 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 06:19:16,691 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-20 06:19:16,696 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 06:19:16,696 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 06:19:16,696 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 06:19:16,697 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 06:19:16,697 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 06:19:16,697 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-20 06:19:16,697 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 06:19:16,698 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-20 06:19:16,698 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-20 06:19:16,698 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 06:19:16,698 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 06:19:16,699 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_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 246513a49efb434b9c960a67f526057a6e0f9037478ee43a300fa4a565ea6e54 [2021-11-20 06:19:16,988 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 06:19:17,011 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 06:19:17,015 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 06:19:17,016 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 06:19:17,019 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 06:19:17,021 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/../../sv-benchmarks/c/reducercommutativity/sep10-2.i [2021-11-20 06:19:17,107 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/data/eb1edd688/8c8fce87a8984bfa8c3fc2c6204d1a74/FLAG4d97043e3 [2021-11-20 06:19:17,782 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 06:19:17,782 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/sv-benchmarks/c/reducercommutativity/sep10-2.i [2021-11-20 06:19:17,790 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/data/eb1edd688/8c8fce87a8984bfa8c3fc2c6204d1a74/FLAG4d97043e3 [2021-11-20 06:19:18,115 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/data/eb1edd688/8c8fce87a8984bfa8c3fc2c6204d1a74 [2021-11-20 06:19:18,118 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 06:19:18,120 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 06:19:18,122 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 06:19:18,122 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 06:19:18,141 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 06:19:18,141 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 06:19:18" (1/1) ... [2021-11-20 06:19:18,143 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4c80bef3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:19:18, skipping insertion in model container [2021-11-20 06:19:18,143 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 06:19:18" (1/1) ... [2021-11-20 06:19:18,151 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 06:19:18,168 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 06:19:18,389 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/sv-benchmarks/c/reducercommutativity/sep10-2.i[1293,1306] [2021-11-20 06:19:18,393 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 06:19:18,400 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 06:19:18,422 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/sv-benchmarks/c/reducercommutativity/sep10-2.i[1293,1306] [2021-11-20 06:19:18,423 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 06:19:18,437 INFO L208 MainTranslator]: Completed translation [2021-11-20 06:19:18,438 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:19:18 WrapperNode [2021-11-20 06:19:18,438 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 06:19:18,439 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 06:19:18,440 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 06:19:18,440 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 06:19:18,450 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:19:18" (1/1) ... [2021-11-20 06:19:18,459 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:19:18" (1/1) ... [2021-11-20 06:19:18,482 INFO L137 Inliner]: procedures = 16, calls = 22, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 67 [2021-11-20 06:19:18,483 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 06:19:18,484 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 06:19:18,484 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 06:19:18,484 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 06:19:18,492 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:19:18" (1/1) ... [2021-11-20 06:19:18,492 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:19:18" (1/1) ... [2021-11-20 06:19:18,494 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:19:18" (1/1) ... [2021-11-20 06:19:18,495 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:19:18" (1/1) ... [2021-11-20 06:19:18,501 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:19:18" (1/1) ... [2021-11-20 06:19:18,506 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:19:18" (1/1) ... [2021-11-20 06:19:18,507 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:19:18" (1/1) ... [2021-11-20 06:19:18,510 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 06:19:18,511 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 06:19:18,511 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 06:19:18,511 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 06:19:18,512 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:19:18" (1/1) ... [2021-11-20 06:19:18,524 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 06:19:18,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 06:19:18,549 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 06:19:18,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 06:19:18,602 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 06:19:18,602 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 06:19:18,603 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 06:19:18,603 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 06:19:18,603 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 06:19:18,603 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 06:19:18,603 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 06:19:18,604 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 06:19:18,604 INFO L130 BoogieDeclarations]: Found specification of procedure sep [2021-11-20 06:19:18,604 INFO L138 BoogieDeclarations]: Found implementation of procedure sep [2021-11-20 06:19:18,701 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 06:19:18,703 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 06:19:18,941 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 06:19:18,948 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 06:19:18,949 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-20 06:19:18,951 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 06:19:18 BoogieIcfgContainer [2021-11-20 06:19:18,951 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 06:19:18,953 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 06:19:18,953 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 06:19:18,962 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 06:19:18,963 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 06:19:18" (1/3) ... [2021-11-20 06:19:18,963 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@457c7283 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 06:19:18, skipping insertion in model container [2021-11-20 06:19:18,964 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:19:18" (2/3) ... [2021-11-20 06:19:18,964 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@457c7283 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 06:19:18, skipping insertion in model container [2021-11-20 06:19:18,964 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 06:19:18" (3/3) ... [2021-11-20 06:19:18,966 INFO L111 eAbstractionObserver]: Analyzing ICFG sep10-2.i [2021-11-20 06:19:18,979 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 06:19:18,980 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 06:19:19,043 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 06:19:19,053 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-20 06:19:19,053 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 06:19:19,075 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 22 states have internal predecessors, (30), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 06:19:19,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-20 06:19:19,084 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 06:19:19,085 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 06:19:19,085 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 06:19:19,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 06:19:19,093 INFO L85 PathProgramCache]: Analyzing trace with hash -1312709850, now seen corresponding path program 1 times [2021-11-20 06:19:19,111 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 06:19:19,113 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [545306640] [2021-11-20 06:19:19,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 06:19:19,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 06:19:19,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:19,377 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-11-20 06:19:19,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:19,391 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-20 06:19:19,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:19,403 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-20 06:19:19,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:19,416 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-20 06:19:19,416 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 06:19:19,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [545306640] [2021-11-20 06:19:19,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [545306640] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 06:19:19,418 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 06:19:19,418 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 06:19:19,421 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482620179] [2021-11-20 06:19:19,421 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 06:19:19,427 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 06:19:19,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 06:19:19,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 06:19:19,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 06:19:19,462 INFO L87 Difference]: Start difference. First operand has 27 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 22 states have internal predecessors, (30), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-20 06:19:19,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 06:19:19,501 INFO L93 Difference]: Finished difference Result 52 states and 73 transitions. [2021-11-20 06:19:19,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 06:19:19,504 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 28 [2021-11-20 06:19:19,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 06:19:19,513 INFO L225 Difference]: With dead ends: 52 [2021-11-20 06:19:19,513 INFO L226 Difference]: Without dead ends: 25 [2021-11-20 06:19:19,517 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 06:19:19,521 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 1 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 06:19:19,523 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 58 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 06:19:19,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-20 06:19:19,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-11-20 06:19:19,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 06:19:19,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2021-11-20 06:19:19,568 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 28 [2021-11-20 06:19:19,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 06:19:19,568 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2021-11-20 06:19:19,569 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-20 06:19:19,569 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2021-11-20 06:19:19,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 06:19:19,572 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 06:19:19,572 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 06:19:19,572 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 06:19:19,573 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 06:19:19,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 06:19:19,574 INFO L85 PathProgramCache]: Analyzing trace with hash 1845794557, now seen corresponding path program 1 times [2021-11-20 06:19:19,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 06:19:19,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284415882] [2021-11-20 06:19:19,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 06:19:19,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 06:19:19,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:19,633 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-11-20 06:19:19,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:19,654 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-20 06:19:19,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:19,680 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-20 06:19:19,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:19,721 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-20 06:19:19,721 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 06:19:19,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284415882] [2021-11-20 06:19:19,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1284415882] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 06:19:19,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855495482] [2021-11-20 06:19:19,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 06:19:19,723 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:19:19,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 06:19:19,736 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 06:19:19,737 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 06:19:19,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:19,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 06:19:19,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 06:19:19,967 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 06:19:19,967 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 06:19:19,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [855495482] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 06:19:19,968 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 06:19:19,968 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2021-11-20 06:19:19,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447204379] [2021-11-20 06:19:19,970 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 06:19:19,971 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 06:19:19,971 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 06:19:19,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 06:19:19,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 06:19:19,972 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 06:19:19,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 06:19:19,987 INFO L93 Difference]: Finished difference Result 45 states and 58 transitions. [2021-11-20 06:19:19,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 06:19:19,988 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 30 [2021-11-20 06:19:19,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 06:19:19,990 INFO L225 Difference]: With dead ends: 45 [2021-11-20 06:19:19,990 INFO L226 Difference]: Without dead ends: 27 [2021-11-20 06:19:19,991 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 06:19:19,993 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 3 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 06:19:19,994 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 50 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 06:19:19,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-20 06:19:20,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2021-11-20 06:19:20,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 06:19:20,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2021-11-20 06:19:20,002 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 30 [2021-11-20 06:19:20,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 06:19:20,005 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2021-11-20 06:19:20,005 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 06:19:20,006 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2021-11-20 06:19:20,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-20 06:19:20,009 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 06:19:20,010 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 06:19:20,044 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-20 06:19:20,231 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:19:20,231 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 06:19:20,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 06:19:20,232 INFO L85 PathProgramCache]: Analyzing trace with hash -701057785, now seen corresponding path program 1 times [2021-11-20 06:19:20,232 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 06:19:20,233 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [332498977] [2021-11-20 06:19:20,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 06:19:20,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 06:19:20,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:20,279 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-11-20 06:19:20,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:20,309 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-20 06:19:20,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:20,324 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-11-20 06:19:20,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:20,345 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-20 06:19:20,345 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 06:19:20,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [332498977] [2021-11-20 06:19:20,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [332498977] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 06:19:20,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2102284469] [2021-11-20 06:19:20,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 06:19:20,346 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:19:20,346 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 06:19:20,347 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 06:19:20,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 06:19:20,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:20,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 06:19:20,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 06:19:20,591 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-20 06:19:20,591 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 06:19:20,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2102284469] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 06:19:20,592 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 06:19:20,592 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-20 06:19:20,593 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667638030] [2021-11-20 06:19:20,594 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 06:19:20,594 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 06:19:20,594 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 06:19:20,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 06:19:20,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-20 06:19:20,598 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 06:19:20,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 06:19:20,623 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2021-11-20 06:19:20,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 06:19:20,625 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2021-11-20 06:19:20,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 06:19:20,628 INFO L225 Difference]: With dead ends: 41 [2021-11-20 06:19:20,628 INFO L226 Difference]: Without dead ends: 27 [2021-11-20 06:19:20,629 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-20 06:19:20,635 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 1 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 06:19:20,637 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 49 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 06:19:20,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-20 06:19:20,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-11-20 06:19:20,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 21 states have internal predecessors, (25), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 06:19:20,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2021-11-20 06:19:20,654 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 39 [2021-11-20 06:19:20,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 06:19:20,655 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2021-11-20 06:19:20,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 06:19:20,656 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2021-11-20 06:19:20,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-20 06:19:20,662 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 06:19:20,662 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 06:19:20,704 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 06:19:20,887 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-20 06:19:20,888 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 06:19:20,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 06:19:20,888 INFO L85 PathProgramCache]: Analyzing trace with hash -235909079, now seen corresponding path program 1 times [2021-11-20 06:19:20,888 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 06:19:20,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [516208649] [2021-11-20 06:19:20,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 06:19:20,889 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 06:19:20,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:20,932 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-11-20 06:19:20,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:20,967 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-20 06:19:20,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:20,981 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-11-20 06:19:20,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:20,994 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-20 06:19:20,995 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 06:19:20,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [516208649] [2021-11-20 06:19:20,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [516208649] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 06:19:20,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [763517602] [2021-11-20 06:19:20,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 06:19:20,996 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:19:20,996 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 06:19:20,997 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 06:19:21,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 06:19:21,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:21,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 06:19:21,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 06:19:21,240 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-20 06:19:21,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 06:19:21,381 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-20 06:19:21,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [763517602] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 06:19:21,382 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 06:19:21,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 4] total 9 [2021-11-20 06:19:21,386 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457248210] [2021-11-20 06:19:21,387 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 06:19:21,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-20 06:19:21,389 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 06:19:21,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-20 06:19:21,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-11-20 06:19:21,391 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 9 states have internal predecessors, (40), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-20 06:19:21,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 06:19:21,450 INFO L93 Difference]: Finished difference Result 58 states and 76 transitions. [2021-11-20 06:19:21,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-20 06:19:21,451 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 9 states have internal predecessors, (40), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 41 [2021-11-20 06:19:21,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 06:19:21,452 INFO L225 Difference]: With dead ends: 58 [2021-11-20 06:19:21,452 INFO L226 Difference]: Without dead ends: 37 [2021-11-20 06:19:21,453 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-11-20 06:19:21,455 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 12 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 06:19:21,455 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 156 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 06:19:21,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-20 06:19:21,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2021-11-20 06:19:21,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 30 states have internal predecessors, (35), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 06:19:21,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2021-11-20 06:19:21,465 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 41 [2021-11-20 06:19:21,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 06:19:21,465 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2021-11-20 06:19:21,466 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 9 states have internal predecessors, (40), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-20 06:19:21,469 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2021-11-20 06:19:21,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 06:19:21,473 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 06:19:21,473 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 06:19:21,516 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-20 06:19:21,686 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:19:21,687 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 06:19:21,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 06:19:21,688 INFO L85 PathProgramCache]: Analyzing trace with hash 1946429025, now seen corresponding path program 2 times [2021-11-20 06:19:21,688 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 06:19:21,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508174702] [2021-11-20 06:19:21,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 06:19:21,688 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 06:19:21,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:21,781 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-11-20 06:19:21,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:21,791 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-11-20 06:19:21,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:21,800 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-20 06:19:21,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:21,813 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-20 06:19:21,813 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 06:19:21,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508174702] [2021-11-20 06:19:21,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [508174702] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 06:19:21,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [943702818] [2021-11-20 06:19:21,814 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 06:19:21,814 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:19:21,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 06:19:21,815 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 06:19:21,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 06:19:21,894 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 06:19:21,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 06:19:21,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-20 06:19:21,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 06:19:22,069 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-20 06:19:22,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 06:19:22,274 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-20 06:19:22,275 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [943702818] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 06:19:22,275 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 06:19:22,276 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 7, 7] total 14 [2021-11-20 06:19:22,276 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482842854] [2021-11-20 06:19:22,276 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 06:19:22,278 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-20 06:19:22,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 06:19:22,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-20 06:19:22,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-11-20 06:19:22,281 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 14 states, 14 states have (on average 3.7857142857142856) internal successors, (53), 14 states have internal predecessors, (53), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-20 06:19:22,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 06:19:22,364 INFO L93 Difference]: Finished difference Result 74 states and 92 transitions. [2021-11-20 06:19:22,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-20 06:19:22,365 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7857142857142856) internal successors, (53), 14 states have internal predecessors, (53), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 56 [2021-11-20 06:19:22,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 06:19:22,366 INFO L225 Difference]: With dead ends: 74 [2021-11-20 06:19:22,367 INFO L226 Difference]: Without dead ends: 50 [2021-11-20 06:19:22,367 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-11-20 06:19:22,369 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 17 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 06:19:22,369 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 111 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 06:19:22,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-20 06:19:22,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2021-11-20 06:19:22,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 44 states have internal predecessors, (49), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 06:19:22,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 55 transitions. [2021-11-20 06:19:22,378 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 55 transitions. Word has length 56 [2021-11-20 06:19:22,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 06:19:22,378 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 55 transitions. [2021-11-20 06:19:22,379 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.7857142857142856) internal successors, (53), 14 states have internal predecessors, (53), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-20 06:19:22,379 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 55 transitions. [2021-11-20 06:19:22,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-20 06:19:22,380 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 06:19:22,381 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 6, 6, 6, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 06:19:22,409 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 06:19:22,591 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:19:22,591 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 06:19:22,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 06:19:22,592 INFO L85 PathProgramCache]: Analyzing trace with hash 1341839115, now seen corresponding path program 3 times [2021-11-20 06:19:22,592 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 06:19:22,592 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715873285] [2021-11-20 06:19:22,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 06:19:22,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 06:19:22,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:22,692 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-20 06:19:22,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:22,735 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-11-20 06:19:22,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:22,756 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-20 06:19:22,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:22,770 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 137 trivial. 0 not checked. [2021-11-20 06:19:22,770 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 06:19:22,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715873285] [2021-11-20 06:19:22,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [715873285] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 06:19:22,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [73215148] [2021-11-20 06:19:22,771 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 06:19:22,771 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:19:22,771 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 06:19:22,780 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 06:19:22,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 06:19:22,857 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 06:19:22,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 06:19:22,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 06:19:22,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 06:19:23,038 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 40 proven. 5 refuted. 0 times theorem prover too weak. 137 trivial. 0 not checked. [2021-11-20 06:19:23,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 06:19:23,201 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 40 proven. 5 refuted. 0 times theorem prover too weak. 137 trivial. 0 not checked. [2021-11-20 06:19:23,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [73215148] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 06:19:23,205 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 06:19:23,205 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-20 06:19:23,205 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937355227] [2021-11-20 06:19:23,205 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 06:19:23,207 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 06:19:23,208 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 06:19:23,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 06:19:23,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-11-20 06:19:23,209 INFO L87 Difference]: Start difference. First operand 49 states and 55 transitions. Second operand has 8 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 06:19:23,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 06:19:23,266 INFO L93 Difference]: Finished difference Result 86 states and 107 transitions. [2021-11-20 06:19:23,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-20 06:19:23,266 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 70 [2021-11-20 06:19:23,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 06:19:23,272 INFO L225 Difference]: With dead ends: 86 [2021-11-20 06:19:23,273 INFO L226 Difference]: Without dead ends: 61 [2021-11-20 06:19:23,274 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-11-20 06:19:23,279 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 26 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 06:19:23,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 80 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 06:19:23,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-20 06:19:23,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-11-20 06:19:23,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.1607142857142858) internal successors, (65), 56 states have internal predecessors, (65), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 06:19:23,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 71 transitions. [2021-11-20 06:19:23,304 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 71 transitions. Word has length 70 [2021-11-20 06:19:23,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 06:19:23,305 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 71 transitions. [2021-11-20 06:19:23,305 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 06:19:23,305 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 71 transitions. [2021-11-20 06:19:23,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-20 06:19:23,309 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 06:19:23,310 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 18, 10, 10, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 06:19:23,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 06:19:23,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-20 06:19:23,535 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 06:19:23,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 06:19:23,536 INFO L85 PathProgramCache]: Analyzing trace with hash -189786485, now seen corresponding path program 4 times [2021-11-20 06:19:23,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 06:19:23,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56702748] [2021-11-20 06:19:23,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 06:19:23,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 06:19:23,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:23,629 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-20 06:19:23,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:23,716 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-11-20 06:19:23,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:23,748 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 79 [2021-11-20 06:19:23,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:23,781 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 299 refuted. 0 times theorem prover too weak. 333 trivial. 0 not checked. [2021-11-20 06:19:23,781 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 06:19:23,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56702748] [2021-11-20 06:19:23,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [56702748] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 06:19:23,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [221075490] [2021-11-20 06:19:23,782 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 06:19:23,782 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:19:23,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 06:19:23,787 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 06:19:23,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 06:19:23,910 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 06:19:23,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 06:19:23,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 06:19:23,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 06:19:24,148 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 244 proven. 51 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2021-11-20 06:19:24,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 06:19:24,373 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 299 refuted. 0 times theorem prover too weak. 333 trivial. 0 not checked. [2021-11-20 06:19:24,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [221075490] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 06:19:24,374 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 06:19:24,374 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 12 [2021-11-20 06:19:24,374 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811965035] [2021-11-20 06:19:24,375 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 06:19:24,375 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-20 06:19:24,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 06:19:24,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-20 06:19:24,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-11-20 06:19:24,377 INFO L87 Difference]: Start difference. First operand 61 states and 71 transitions. Second operand has 12 states, 12 states have (on average 4.916666666666667) internal successors, (59), 12 states have internal predecessors, (59), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 06:19:24,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 06:19:24,418 INFO L93 Difference]: Finished difference Result 110 states and 139 transitions. [2021-11-20 06:19:24,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 06:19:24,419 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.916666666666667) internal successors, (59), 12 states have internal predecessors, (59), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) Word has length 106 [2021-11-20 06:19:24,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 06:19:24,421 INFO L225 Difference]: With dead ends: 110 [2021-11-20 06:19:24,421 INFO L226 Difference]: Without dead ends: 73 [2021-11-20 06:19:24,422 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 214 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-11-20 06:19:24,423 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 43 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 06:19:24,423 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 88 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 06:19:24,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-11-20 06:19:24,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2021-11-20 06:19:24,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.1911764705882353) internal successors, (81), 68 states have internal predecessors, (81), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 06:19:24,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2021-11-20 06:19:24,432 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 106 [2021-11-20 06:19:24,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 06:19:24,433 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2021-11-20 06:19:24,433 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.916666666666667) internal successors, (59), 12 states have internal predecessors, (59), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 06:19:24,433 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2021-11-20 06:19:24,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-20 06:19:24,435 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 06:19:24,436 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 30, 10, 10, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 06:19:24,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 06:19:24,651 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-20 06:19:24,651 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 06:19:24,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 06:19:24,652 INFO L85 PathProgramCache]: Analyzing trace with hash 1263048203, now seen corresponding path program 5 times [2021-11-20 06:19:24,652 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 06:19:24,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941646023] [2021-11-20 06:19:24,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 06:19:24,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 06:19:24,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:24,810 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-20 06:19:24,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:24,845 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-11-20 06:19:24,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:24,864 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 103 [2021-11-20 06:19:24,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:24,893 INFO L134 CoverageAnalysis]: Checked inductivity of 1514 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1510 trivial. 0 not checked. [2021-11-20 06:19:24,893 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 06:19:24,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941646023] [2021-11-20 06:19:24,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1941646023] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 06:19:24,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [622970136] [2021-11-20 06:19:24,894 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-20 06:19:24,895 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:19:24,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 06:19:24,899 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 06:19:24,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 06:19:25,354 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2021-11-20 06:19:25,355 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 06:19:25,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 06:19:25,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 06:19:25,681 INFO L134 CoverageAnalysis]: Checked inductivity of 1514 backedges. 650 proven. 4 refuted. 0 times theorem prover too weak. 860 trivial. 0 not checked. [2021-11-20 06:19:25,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 06:19:25,989 INFO L134 CoverageAnalysis]: Checked inductivity of 1514 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1510 trivial. 0 not checked. [2021-11-20 06:19:25,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [622970136] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 06:19:25,990 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 06:19:25,990 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2021-11-20 06:19:25,990 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529675136] [2021-11-20 06:19:25,991 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 06:19:25,992 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-20 06:19:25,992 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 06:19:25,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-20 06:19:25,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-11-20 06:19:25,996 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand has 9 states, 9 states have (on average 4.333333333333333) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-20 06:19:26,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 06:19:26,032 INFO L93 Difference]: Finished difference Result 122 states and 150 transitions. [2021-11-20 06:19:26,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-20 06:19:26,033 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.333333333333333) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 142 [2021-11-20 06:19:26,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 06:19:26,035 INFO L225 Difference]: With dead ends: 122 [2021-11-20 06:19:26,035 INFO L226 Difference]: Without dead ends: 81 [2021-11-20 06:19:26,036 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 286 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-11-20 06:19:26,037 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 6 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 06:19:26,038 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 95 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 06:19:26,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-20 06:19:26,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2021-11-20 06:19:26,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.1710526315789473) internal successors, (89), 76 states have internal predecessors, (89), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 06:19:26,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 95 transitions. [2021-11-20 06:19:26,055 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 95 transitions. Word has length 142 [2021-11-20 06:19:26,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 06:19:26,057 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 95 transitions. [2021-11-20 06:19:26,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.333333333333333) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-20 06:19:26,058 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 95 transitions. [2021-11-20 06:19:26,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-11-20 06:19:26,063 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 06:19:26,063 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 30, 10, 10, 6, 6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 06:19:26,104 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 06:19:26,283 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:19:26,283 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 06:19:26,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 06:19:26,283 INFO L85 PathProgramCache]: Analyzing trace with hash -660788349, now seen corresponding path program 6 times [2021-11-20 06:19:26,284 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 06:19:26,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638156535] [2021-11-20 06:19:26,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 06:19:26,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 06:19:26,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:26,468 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-20 06:19:26,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:26,487 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-11-20 06:19:26,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:26,500 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 111 [2021-11-20 06:19:26,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:26,517 INFO L134 CoverageAnalysis]: Checked inductivity of 1546 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 1510 trivial. 0 not checked. [2021-11-20 06:19:26,518 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 06:19:26,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638156535] [2021-11-20 06:19:26,518 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638156535] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 06:19:26,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594683493] [2021-11-20 06:19:26,518 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-20 06:19:26,518 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:19:26,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 06:19:26,520 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 06:19:26,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 06:19:26,943 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2021-11-20 06:19:26,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 06:19:26,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 06:19:26,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 06:19:27,259 INFO L134 CoverageAnalysis]: Checked inductivity of 1546 backedges. 650 proven. 36 refuted. 0 times theorem prover too weak. 860 trivial. 0 not checked. [2021-11-20 06:19:27,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 06:19:27,583 INFO L134 CoverageAnalysis]: Checked inductivity of 1546 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 1510 trivial. 0 not checked. [2021-11-20 06:19:27,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [594683493] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 06:19:27,584 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 06:19:27,584 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 12 [2021-11-20 06:19:27,588 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122070020] [2021-11-20 06:19:27,588 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 06:19:27,589 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-20 06:19:27,589 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 06:19:27,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-20 06:19:27,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-11-20 06:19:27,592 INFO L87 Difference]: Start difference. First operand 81 states and 95 transitions. Second operand has 12 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 12 states have internal predecessors, (47), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-20 06:19:27,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 06:19:27,640 INFO L93 Difference]: Finished difference Result 128 states and 155 transitions. [2021-11-20 06:19:27,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-20 06:19:27,643 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 12 states have internal predecessors, (47), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 150 [2021-11-20 06:19:27,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 06:19:27,646 INFO L225 Difference]: With dead ends: 128 [2021-11-20 06:19:27,646 INFO L226 Difference]: Without dead ends: 87 [2021-11-20 06:19:27,650 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 302 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-11-20 06:19:27,653 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 9 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 06:19:27,654 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 95 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 06:19:27,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-11-20 06:19:27,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-11-20 06:19:27,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.1585365853658536) internal successors, (95), 82 states have internal predecessors, (95), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 06:19:27,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 101 transitions. [2021-11-20 06:19:27,678 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 101 transitions. Word has length 150 [2021-11-20 06:19:27,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 06:19:27,680 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 101 transitions. [2021-11-20 06:19:27,681 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 12 states have internal predecessors, (47), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-20 06:19:27,681 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 101 transitions. [2021-11-20 06:19:27,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-20 06:19:27,684 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 06:19:27,695 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 30, 10, 10, 9, 9, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 06:19:27,741 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-20 06:19:27,906 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:19:27,906 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 06:19:27,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 06:19:27,907 INFO L85 PathProgramCache]: Analyzing trace with hash -1766594339, now seen corresponding path program 7 times [2021-11-20 06:19:27,907 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 06:19:27,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1920761492] [2021-11-20 06:19:27,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 06:19:27,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 06:19:28,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:29,130 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-20 06:19:29,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:29,459 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-11-20 06:19:29,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:29,713 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117 [2021-11-20 06:19:29,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:29,941 INFO L134 CoverageAnalysis]: Checked inductivity of 1591 backedges. 0 proven. 1305 refuted. 0 times theorem prover too weak. 286 trivial. 0 not checked. [2021-11-20 06:19:29,942 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 06:19:29,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1920761492] [2021-11-20 06:19:29,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1920761492] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 06:19:29,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1391157675] [2021-11-20 06:19:29,943 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 06:19:29,943 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:19:29,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 06:19:29,947 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 06:19:29,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 06:19:30,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:30,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 481 conjuncts, 89 conjunts are in the unsatisfiable core [2021-11-20 06:19:30,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 06:19:32,504 INFO L134 CoverageAnalysis]: Checked inductivity of 1591 backedges. 0 proven. 1305 refuted. 0 times theorem prover too weak. 286 trivial. 0 not checked. [2021-11-20 06:19:32,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 06:19:34,007 INFO L134 CoverageAnalysis]: Checked inductivity of 1591 backedges. 4 proven. 1307 refuted. 0 times theorem prover too weak. 280 trivial. 0 not checked. [2021-11-20 06:19:34,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1391157675] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 06:19:34,008 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 06:19:34,008 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 22] total 39 [2021-11-20 06:19:34,008 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698184799] [2021-11-20 06:19:34,009 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 06:19:34,011 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-20 06:19:34,011 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 06:19:34,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-20 06:19:34,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=1379, Unknown=0, NotChecked=0, Total=1482 [2021-11-20 06:19:34,013 INFO L87 Difference]: Start difference. First operand 87 states and 101 transitions. Second operand has 39 states, 38 states have (on average 2.3947368421052633) internal successors, (91), 32 states have internal predecessors, (91), 3 states have call successors, (3), 1 states have call predecessors, (3), 4 states have return successors, (7), 7 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-20 06:19:35,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 06:19:35,021 INFO L93 Difference]: Finished difference Result 293 states and 410 transitions. [2021-11-20 06:19:35,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-20 06:19:35,023 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 2.3947368421052633) internal successors, (91), 32 states have internal predecessors, (91), 3 states have call successors, (3), 1 states have call predecessors, (3), 4 states have return successors, (7), 7 states have call predecessors, (7), 3 states have call successors, (7) Word has length 156 [2021-11-20 06:19:35,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 06:19:35,034 INFO L225 Difference]: With dead ends: 293 [2021-11-20 06:19:35,034 INFO L226 Difference]: Without dead ends: 289 [2021-11-20 06:19:35,035 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 308 SyntacticMatches, 12 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=111, Invalid=1449, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 06:19:35,036 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 65 mSDsluCounter, 3144 mSDsCounter, 0 mSdLazyCounter, 1190 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 3270 SdHoareTripleChecker+Invalid, 1213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 1190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-20 06:19:35,038 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 3270 Invalid, 1213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 1190 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-20 06:19:35,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-20 06:19:35,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 229. [2021-11-20 06:19:35,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 221 states have (on average 1.2714932126696832) internal successors, (281), 222 states have internal predecessors, (281), 5 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-20 06:19:35,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 295 transitions. [2021-11-20 06:19:35,122 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 295 transitions. Word has length 156 [2021-11-20 06:19:35,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 06:19:35,123 INFO L470 AbstractCegarLoop]: Abstraction has 229 states and 295 transitions. [2021-11-20 06:19:35,123 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 2.3947368421052633) internal successors, (91), 32 states have internal predecessors, (91), 3 states have call successors, (3), 1 states have call predecessors, (3), 4 states have return successors, (7), 7 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-20 06:19:35,124 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 295 transitions. [2021-11-20 06:19:35,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-20 06:19:35,127 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 06:19:35,128 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 29, 10, 10, 9, 9, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 06:19:35,171 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-20 06:19:35,355 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:19:35,355 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 06:19:35,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 06:19:35,355 INFO L85 PathProgramCache]: Analyzing trace with hash -1086535969, now seen corresponding path program 1 times [2021-11-20 06:19:35,356 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 06:19:35,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [365684869] [2021-11-20 06:19:35,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 06:19:35,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 06:19:35,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:36,487 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-20 06:19:36,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:36,823 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-11-20 06:19:36,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:36,842 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117 [2021-11-20 06:19:36,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:37,367 INFO L134 CoverageAnalysis]: Checked inductivity of 1591 backedges. 324 proven. 981 refuted. 0 times theorem prover too weak. 286 trivial. 0 not checked. [2021-11-20 06:19:37,367 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 06:19:37,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [365684869] [2021-11-20 06:19:37,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [365684869] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 06:19:37,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1503280403] [2021-11-20 06:19:37,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 06:19:37,368 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:19:37,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 06:19:37,369 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 06:19:37,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 06:19:37,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:37,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 480 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-20 06:19:37,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 06:19:37,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 06:19:37,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 17 [2021-11-20 06:19:38,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2021-11-20 06:19:38,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 24 treesize of output 20 [2021-11-20 06:19:40,409 INFO L134 CoverageAnalysis]: Checked inductivity of 1591 backedges. 651 proven. 487 refuted. 0 times theorem prover too weak. 453 trivial. 0 not checked. [2021-11-20 06:19:40,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 06:19:42,303 INFO L134 CoverageAnalysis]: Checked inductivity of 1591 backedges. 686 proven. 450 refuted. 0 times theorem prover too weak. 455 trivial. 0 not checked. [2021-11-20 06:19:42,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1503280403] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 06:19:42,303 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 06:19:42,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 22, 20] total 66 [2021-11-20 06:19:42,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871438133] [2021-11-20 06:19:42,304 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 06:19:42,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-20 06:19:42,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 06:19:42,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-20 06:19:42,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=4055, Unknown=0, NotChecked=0, Total=4290 [2021-11-20 06:19:42,309 INFO L87 Difference]: Start difference. First operand 229 states and 295 transitions. Second operand has 66 states, 64 states have (on average 2.859375) internal successors, (183), 63 states have internal predecessors, (183), 5 states have call successors, (8), 2 states have call predecessors, (8), 6 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-20 06:19:47,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 06:19:47,928 INFO L93 Difference]: Finished difference Result 916 states and 1259 transitions. [2021-11-20 06:19:47,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-20 06:19:47,929 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 64 states have (on average 2.859375) internal successors, (183), 63 states have internal predecessors, (183), 5 states have call successors, (8), 2 states have call predecessors, (8), 6 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) Word has length 156 [2021-11-20 06:19:47,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 06:19:47,937 INFO L225 Difference]: With dead ends: 916 [2021-11-20 06:19:47,937 INFO L226 Difference]: Without dead ends: 667 [2021-11-20 06:19:47,946 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 434 GetRequests, 320 SyntacticMatches, 5 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2752 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=860, Invalid=11350, Unknown=0, NotChecked=0, Total=12210 [2021-11-20 06:19:47,947 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 237 mSDsluCounter, 1796 mSDsCounter, 0 mSdLazyCounter, 2489 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 1849 SdHoareTripleChecker+Invalid, 3992 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 2489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1400 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-20 06:19:47,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [241 Valid, 1849 Invalid, 3992 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 2489 Invalid, 0 Unknown, 1400 Unchecked, 2.1s Time] [2021-11-20 06:19:47,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 667 states. [2021-11-20 06:19:47,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 667 to 635. [2021-11-20 06:19:48,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 635 states, 617 states have (on average 1.3354943273905997) internal successors, (824), 622 states have internal predecessors, (824), 9 states have call successors, (9), 3 states have call predecessors, (9), 8 states have return successors, (50), 9 states have call predecessors, (50), 9 states have call successors, (50) [2021-11-20 06:19:48,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 635 states to 635 states and 883 transitions. [2021-11-20 06:19:48,011 INFO L78 Accepts]: Start accepts. Automaton has 635 states and 883 transitions. Word has length 156 [2021-11-20 06:19:48,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 06:19:48,012 INFO L470 AbstractCegarLoop]: Abstraction has 635 states and 883 transitions. [2021-11-20 06:19:48,012 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 64 states have (on average 2.859375) internal successors, (183), 63 states have internal predecessors, (183), 5 states have call successors, (8), 2 states have call predecessors, (8), 6 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-20 06:19:48,013 INFO L276 IsEmpty]: Start isEmpty. Operand 635 states and 883 transitions. [2021-11-20 06:19:48,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-20 06:19:48,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 06:19:48,022 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 29, 10, 10, 9, 9, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 06:19:48,064 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 06:19:48,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:19:48,235 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 06:19:48,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 06:19:48,236 INFO L85 PathProgramCache]: Analyzing trace with hash -1508428901, now seen corresponding path program 2 times [2021-11-20 06:19:48,236 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 06:19:48,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [357770625] [2021-11-20 06:19:48,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 06:19:48,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 06:19:48,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:50,123 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-20 06:19:50,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:50,141 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-11-20 06:19:50,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:50,661 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117 [2021-11-20 06:19:50,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:19:50,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1591 backedges. 650 proven. 768 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2021-11-20 06:19:50,992 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 06:19:50,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [357770625] [2021-11-20 06:19:50,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [357770625] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 06:19:50,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [808797160] [2021-11-20 06:19:50,993 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 06:19:50,993 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:19:50,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 06:19:50,993 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 06:19:50,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 06:19:51,119 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 06:19:51,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 06:19:51,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 480 conjuncts, 110 conjunts are in the unsatisfiable core [2021-11-20 06:19:51,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 06:19:51,557 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-11-20 06:19:51,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 17 [2021-11-20 06:19:52,175 INFO L354 Elim1Store]: treesize reduction 84, result has 20.8 percent of original size [2021-11-20 06:19:52,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 44 [2021-11-20 06:19:52,358 INFO L354 Elim1Store]: treesize reduction 204, result has 14.3 percent of original size [2021-11-20 06:19:52,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 68 treesize of output 59 [2021-11-20 06:19:52,603 INFO L354 Elim1Store]: treesize reduction 204, result has 14.3 percent of original size [2021-11-20 06:19:52,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 68 treesize of output 59 [2021-11-20 06:19:52,803 INFO L354 Elim1Store]: treesize reduction 219, result has 12.4 percent of original size [2021-11-20 06:19:52,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 63 treesize of output 56 [2021-11-20 06:19:53,043 INFO L354 Elim1Store]: treesize reduction 219, result has 12.4 percent of original size [2021-11-20 06:19:53,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 63 treesize of output 56 [2021-11-20 06:19:53,246 INFO L354 Elim1Store]: treesize reduction 219, result has 12.4 percent of original size [2021-11-20 06:19:53,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 63 treesize of output 56 [2021-11-20 06:19:53,523 INFO L354 Elim1Store]: treesize reduction 219, result has 12.4 percent of original size [2021-11-20 06:19:53,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 63 treesize of output 56 [2021-11-20 06:19:53,782 INFO L354 Elim1Store]: treesize reduction 204, result has 14.3 percent of original size [2021-11-20 06:19:53,782 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 68 treesize of output 59 [2021-11-20 06:19:54,001 INFO L354 Elim1Store]: treesize reduction 88, result has 17.8 percent of original size [2021-11-20 06:19:54,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 58 treesize of output 42 [2021-11-20 06:19:54,098 INFO L354 Elim1Store]: treesize reduction 39, result has 18.8 percent of original size [2021-11-20 06:19:54,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 52 treesize of output 33 [2021-11-20 06:20:25,218 INFO L134 CoverageAnalysis]: Checked inductivity of 1591 backedges. 675 proven. 767 refuted. 0 times theorem prover too weak. 149 trivial. 0 not checked. [2021-11-20 06:20:25,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 06:21:21,198 INFO L134 CoverageAnalysis]: Checked inductivity of 1591 backedges. 710 proven. 631 refuted. 0 times theorem prover too weak. 250 trivial. 0 not checked. [2021-11-20 06:21:21,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [808797160] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 06:21:21,199 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 06:21:21,199 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 55, 44] total 120 [2021-11-20 06:21:21,199 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091246755] [2021-11-20 06:21:21,199 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 06:21:21,200 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 120 states [2021-11-20 06:21:21,201 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 06:21:21,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2021-11-20 06:21:21,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=689, Invalid=13546, Unknown=45, NotChecked=0, Total=14280 [2021-11-20 06:21:21,209 INFO L87 Difference]: Start difference. First operand 635 states and 883 transitions. Second operand has 120 states, 120 states have (on average 2.125) internal successors, (255), 117 states have internal predecessors, (255), 4 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-20 06:23:43,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 06:23:43,050 INFO L93 Difference]: Finished difference Result 2273 states and 3218 transitions. [2021-11-20 06:23:43,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-11-20 06:23:43,051 INFO L78 Accepts]: Start accepts. Automaton has has 120 states, 120 states have (on average 2.125) internal successors, (255), 117 states have internal predecessors, (255), 4 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) Word has length 156 [2021-11-20 06:23:43,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 06:23:43,065 INFO L225 Difference]: With dead ends: 2273 [2021-11-20 06:23:43,065 INFO L226 Difference]: Without dead ends: 1564 [2021-11-20 06:23:43,080 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 258 SyntacticMatches, 23 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7617 ImplicationChecksByTransitivity, 217.6s TimeCoverageRelationStatistics Valid=1568, Invalid=25395, Unknown=97, NotChecked=0, Total=27060 [2021-11-20 06:23:43,098 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 341 mSDsluCounter, 4170 mSDsCounter, 0 mSdLazyCounter, 6925 mSolverCounterSat, 270 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 346 SdHoareTripleChecker+Valid, 4244 SdHoareTripleChecker+Invalid, 8442 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 270 IncrementalHoareTripleChecker+Valid, 6925 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1247 IncrementalHoareTripleChecker+Unchecked, 12.7s IncrementalHoareTripleChecker+Time [2021-11-20 06:23:43,098 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [346 Valid, 4244 Invalid, 8442 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [270 Valid, 6925 Invalid, 0 Unknown, 1247 Unchecked, 12.7s Time] [2021-11-20 06:23:43,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1564 states. [2021-11-20 06:23:43,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1564 to 1363. [2021-11-20 06:23:43,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1363 states, 1326 states have (on average 1.3235294117647058) internal successors, (1755), 1338 states have internal predecessors, (1755), 17 states have call successors, (17), 7 states have call predecessors, (17), 19 states have return successors, (164), 17 states have call predecessors, (164), 17 states have call successors, (164) [2021-11-20 06:23:43,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1363 states to 1363 states and 1936 transitions. [2021-11-20 06:23:43,252 INFO L78 Accepts]: Start accepts. Automaton has 1363 states and 1936 transitions. Word has length 156 [2021-11-20 06:23:43,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 06:23:43,253 INFO L470 AbstractCegarLoop]: Abstraction has 1363 states and 1936 transitions. [2021-11-20 06:23:43,253 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 120 states, 120 states have (on average 2.125) internal successors, (255), 117 states have internal predecessors, (255), 4 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-20 06:23:43,254 INFO L276 IsEmpty]: Start isEmpty. Operand 1363 states and 1936 transitions. [2021-11-20 06:23:43,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-20 06:23:43,272 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 06:23:43,272 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 29, 10, 10, 9, 9, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 06:23:43,307 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-20 06:23:43,497 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-20 06:23:43,497 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 06:23:43,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 06:23:43,498 INFO L85 PathProgramCache]: Analyzing trace with hash 1248509279, now seen corresponding path program 3 times [2021-11-20 06:23:43,498 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 06:23:43,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719963004] [2021-11-20 06:23:43,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 06:23:43,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 06:23:43,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:23:45,270 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-20 06:23:45,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:23:45,854 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-11-20 06:23:45,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:23:45,870 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117 [2021-11-20 06:23:45,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 06:23:46,220 INFO L134 CoverageAnalysis]: Checked inductivity of 1591 backedges. 326 proven. 1094 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2021-11-20 06:23:46,220 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 06:23:46,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719963004] [2021-11-20 06:23:46,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [719963004] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 06:23:46,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [245773793] [2021-11-20 06:23:46,221 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 06:23:46,221 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 06:23:46,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 06:23:46,221 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 06:23:46,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af934b1d-008a-429b-b9c3-fb9db2e87b82/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-20 06:23:47,539 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-20 06:23:47,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 06:23:47,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 444 conjuncts, 75 conjunts are in the unsatisfiable core [2021-11-20 06:23:47,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 06:23:47,726 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-11-20 06:23:47,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 17 [2021-11-20 06:23:48,471 INFO L354 Elim1Store]: treesize reduction 84, result has 20.8 percent of original size [2021-11-20 06:23:48,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 44 [2021-11-20 06:23:48,694 INFO L354 Elim1Store]: treesize reduction 207, result has 12.3 percent of original size [2021-11-20 06:23:48,695 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 61 treesize of output 54 [2021-11-20 06:23:48,924 INFO L354 Elim1Store]: treesize reduction 219, result has 12.4 percent of original size [2021-11-20 06:23:48,925 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 63 treesize of output 56 [2021-11-20 06:23:49,154 INFO L354 Elim1Store]: treesize reduction 204, result has 14.3 percent of original size [2021-11-20 06:23:49,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 68 treesize of output 59 [2021-11-20 06:23:49,353 INFO L354 Elim1Store]: treesize reduction 150, result has 15.7 percent of original size [2021-11-20 06:23:49,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 58 treesize of output 51 [2021-11-20 06:23:49,529 INFO L354 Elim1Store]: treesize reduction 198, result has 20.8 percent of original size [2021-11-20 06:23:49,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 63 treesize of output 77 [2021-11-20 06:23:52,136 INFO L354 Elim1Store]: treesize reduction 382, result has 21.6 percent of original size [2021-11-20 06:23:52,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 98 treesize of output 148 [2021-11-20 06:23:57,542 INFO L354 Elim1Store]: treesize reduction 638, result has 14.4 percent of original size [2021-11-20 06:23:57,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 35 case distinctions, treesize of input 238 treesize of output 229 [2021-11-20 06:24:08,308 INFO L354 Elim1Store]: treesize reduction 810, result has 12.8 percent of original size [2021-11-20 06:24:08,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 44 case distinctions, treesize of input 292 treesize of output 262 [2021-11-20 06:24:23,479 INFO L354 Elim1Store]: treesize reduction 88, result has 17.8 percent of original size [2021-11-20 06:24:23,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 50 treesize of output 40 [2021-11-20 06:25:21,331 INFO L134 CoverageAnalysis]: Checked inductivity of 1591 backedges. 854 proven. 347 refuted. 1 times theorem prover too weak. 389 trivial. 0 not checked. [2021-11-20 06:25:21,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 06:26:13,920 INFO L134 CoverageAnalysis]: Checked inductivity of 1591 backedges. 648 proven. 533 refuted. 0 times theorem prover too weak. 410 trivial. 0 not checked. [2021-11-20 06:26:13,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [245773793] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 06:26:13,921 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 06:26:13,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 35] total 109 [2021-11-20 06:26:13,921 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134336799] [2021-11-20 06:26:13,921 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 06:26:13,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2021-11-20 06:26:13,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 06:26:13,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-11-20 06:26:13,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=898, Invalid=10820, Unknown=54, NotChecked=0, Total=11772 [2021-11-20 06:26:13,925 INFO L87 Difference]: Start difference. First operand 1363 states and 1936 transitions. Second operand has 109 states, 109 states have (on average 1.8623853211009174) internal successors, (203), 108 states have internal predecessors, (203), 5 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (7), 4 states have call predecessors, (7), 5 states have call successors, (7)