./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/in-de61.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version f8e1c903 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/in-de61.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 49b7efdcf8f4d6c873493bd370328870547a88b20d287c5de5342268b0966917 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-f8e1c90 [2021-11-09 09:09:24,753 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-09 09:09:24,755 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-09 09:09:24,819 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-09 09:09:24,820 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-09 09:09:24,825 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-09 09:09:24,827 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-09 09:09:24,832 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-09 09:09:24,835 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-09 09:09:24,843 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-09 09:09:24,844 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-09 09:09:24,846 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-09 09:09:24,846 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-09 09:09:24,847 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-09 09:09:24,849 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-09 09:09:24,850 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-09 09:09:24,851 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-09 09:09:24,853 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-09 09:09:24,855 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-09 09:09:24,865 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-09 09:09:24,868 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-09 09:09:24,870 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-09 09:09:24,876 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-09 09:09:24,877 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-09 09:09:24,885 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-09 09:09:24,885 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-09 09:09:24,886 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-09 09:09:24,888 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-09 09:09:24,889 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-09 09:09:24,891 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-09 09:09:24,892 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-09 09:09:24,893 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-09 09:09:24,895 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-09 09:09:24,896 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-09 09:09:24,898 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-09 09:09:24,898 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-09 09:09:24,899 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-09 09:09:24,899 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-09 09:09:24,900 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-09 09:09:24,901 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-09 09:09:24,902 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-09 09:09:24,902 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-09 09:09:24,954 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-09 09:09:24,954 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-09 09:09:24,954 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-09 09:09:24,955 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-09 09:09:24,956 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-09 09:09:24,956 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-09 09:09:24,956 INFO L138 SettingsManager]: * Use SBE=true [2021-11-09 09:09:24,956 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-09 09:09:24,957 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-09 09:09:24,957 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-09 09:09:24,957 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-09 09:09:24,957 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-09 09:09:24,957 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-09 09:09:24,958 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-09 09:09:24,958 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-09 09:09:24,958 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-09 09:09:24,958 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-09 09:09:24,959 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-09 09:09:24,959 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-09 09:09:24,959 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-09 09:09:24,959 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-09 09:09:24,959 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-09 09:09:24,965 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-09 09:09:24,966 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-09 09:09:24,966 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-09 09:09:24,966 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-09 09:09:24,966 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-09 09:09:24,966 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-09 09:09:24,967 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-09 09:09:24,969 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-09 09:09:24,969 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-09 09:09:24,969 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-09 09:09:24,970 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_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 49b7efdcf8f4d6c873493bd370328870547a88b20d287c5de5342268b0966917 [2021-11-09 09:09:25,267 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-09 09:09:25,292 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-09 09:09:25,296 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-09 09:09:25,297 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-09 09:09:25,298 INFO L275 PluginConnector]: CDTParser initialized [2021-11-09 09:09:25,299 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/../../sv-benchmarks/c/loops-crafted-1/in-de61.c [2021-11-09 09:09:25,384 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/data/4a5444394/729ace401499409b93becd08d440ee75/FLAG724c24aee [2021-11-09 09:09:25,872 INFO L306 CDTParser]: Found 1 translation units. [2021-11-09 09:09:25,874 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/sv-benchmarks/c/loops-crafted-1/in-de61.c [2021-11-09 09:09:25,886 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/data/4a5444394/729ace401499409b93becd08d440ee75/FLAG724c24aee [2021-11-09 09:09:26,212 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/data/4a5444394/729ace401499409b93becd08d440ee75 [2021-11-09 09:09:26,215 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-09 09:09:26,217 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-09 09:09:26,221 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-09 09:09:26,221 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-09 09:09:26,226 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-09 09:09:26,227 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 09:09:26" (1/1) ... [2021-11-09 09:09:26,229 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f0d118f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:26, skipping insertion in model container [2021-11-09 09:09:26,229 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 09:09:26" (1/1) ... [2021-11-09 09:09:26,238 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-09 09:09:26,255 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-09 09:09:26,416 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/sv-benchmarks/c/loops-crafted-1/in-de61.c[368,381] [2021-11-09 09:09:26,439 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-09 09:09:26,448 INFO L203 MainTranslator]: Completed pre-run [2021-11-09 09:09:26,459 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/sv-benchmarks/c/loops-crafted-1/in-de61.c[368,381] [2021-11-09 09:09:26,464 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-09 09:09:26,476 INFO L208 MainTranslator]: Completed translation [2021-11-09 09:09:26,477 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:26 WrapperNode [2021-11-09 09:09:26,477 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-09 09:09:26,478 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-09 09:09:26,478 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-09 09:09:26,478 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-09 09:09:26,485 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:26" (1/1) ... [2021-11-09 09:09:26,491 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:26" (1/1) ... [2021-11-09 09:09:26,510 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-09 09:09:26,511 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-09 09:09:26,511 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-09 09:09:26,511 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-09 09:09:26,517 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:26" (1/1) ... [2021-11-09 09:09:26,517 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:26" (1/1) ... [2021-11-09 09:09:26,519 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:26" (1/1) ... [2021-11-09 09:09:26,519 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:26" (1/1) ... [2021-11-09 09:09:26,523 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:26" (1/1) ... [2021-11-09 09:09:26,528 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:26" (1/1) ... [2021-11-09 09:09:26,530 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:26" (1/1) ... [2021-11-09 09:09:26,532 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-09 09:09:26,533 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-09 09:09:26,533 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-09 09:09:26,533 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-09 09:09:26,538 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:26" (1/1) ... [2021-11-09 09:09:26,547 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-09 09:09:26,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:26,590 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-09 09:09:26,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-09 09:09:26,632 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-09 09:09:26,632 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-09 09:09:26,632 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-09 09:09:26,633 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-09 09:09:26,851 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-09 09:09:26,851 INFO L299 CfgBuilder]: Removed 12 assume(true) statements. [2021-11-09 09:09:26,854 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 09:09:26 BoogieIcfgContainer [2021-11-09 09:09:26,854 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-09 09:09:26,858 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-09 09:09:26,872 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-09 09:09:26,876 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-09 09:09:26,876 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.11 09:09:26" (1/3) ... [2021-11-09 09:09:26,877 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60701635 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 09:09:26, skipping insertion in model container [2021-11-09 09:09:26,878 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:26" (2/3) ... [2021-11-09 09:09:26,878 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60701635 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 09:09:26, skipping insertion in model container [2021-11-09 09:09:26,878 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 09:09:26" (3/3) ... [2021-11-09 09:09:26,880 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de61.c [2021-11-09 09:09:26,886 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-09 09:09:26,894 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-09 09:09:26,955 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-09 09:09:26,978 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 [2021-11-09 09:09:26,984 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-09 09:09:26,999 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:27,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-09 09:09:27,005 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:27,005 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:27,006 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:27,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:27,012 INFO L85 PathProgramCache]: Analyzing trace with hash 1928996963, now seen corresponding path program 1 times [2021-11-09 09:09:27,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:27,023 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1866694615] [2021-11-09 09:09:27,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:27,024 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:27,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:27,168 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:27,168 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:27,169 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1866694615] [2021-11-09 09:09:27,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1866694615] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:09:27,170 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:09:27,170 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-09 09:09:27,172 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97090135] [2021-11-09 09:09:27,177 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-09 09:09:27,177 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:27,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-09 09:09:27,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-09 09:09:27,192 INFO L87 Difference]: Start difference. First operand has 17 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:27,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:27,206 INFO L93 Difference]: Finished difference Result 31 states and 53 transitions. [2021-11-09 09:09:27,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-09 09:09:27,208 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-09 09:09:27,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:27,233 INFO L225 Difference]: With dead ends: 31 [2021-11-09 09:09:27,233 INFO L226 Difference]: Without dead ends: 13 [2021-11-09 09:09:27,235 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-09 09:09:27,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-09 09:09:27,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-09 09:09:27,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.5) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:27,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 18 transitions. [2021-11-09 09:09:27,268 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 18 transitions. Word has length 12 [2021-11-09 09:09:27,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:27,268 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 18 transitions. [2021-11-09 09:09:27,269 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:27,269 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 18 transitions. [2021-11-09 09:09:27,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-09 09:09:27,269 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:27,270 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:27,270 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-09 09:09:27,270 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:27,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:27,271 INFO L85 PathProgramCache]: Analyzing trace with hash 1814480359, now seen corresponding path program 1 times [2021-11-09 09:09:27,272 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:27,272 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1857767093] [2021-11-09 09:09:27,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:27,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:27,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:27,758 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:27,758 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:27,759 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1857767093] [2021-11-09 09:09:27,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1857767093] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:09:27,759 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:09:27,760 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-09 09:09:27,760 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718413597] [2021-11-09 09:09:27,761 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-09 09:09:27,762 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:27,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-09 09:09:27,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-09 09:09:27,764 INFO L87 Difference]: Start difference. First operand 13 states and 18 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:27,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:27,903 INFO L93 Difference]: Finished difference Result 31 states and 46 transitions. [2021-11-09 09:09:27,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-09 09:09:27,904 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-09 09:09:27,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:27,905 INFO L225 Difference]: With dead ends: 31 [2021-11-09 09:09:27,906 INFO L226 Difference]: Without dead ends: 14 [2021-11-09 09:09:27,907 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-09 09:09:27,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-09 09:09:27,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-11-09 09:09:27,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:27,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 19 transitions. [2021-11-09 09:09:27,917 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 19 transitions. Word has length 12 [2021-11-09 09:09:27,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:27,917 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 19 transitions. [2021-11-09 09:09:27,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:27,918 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 19 transitions. [2021-11-09 09:09:27,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-09 09:09:27,919 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:27,920 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:27,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-09 09:09:27,920 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:27,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:27,925 INFO L85 PathProgramCache]: Analyzing trace with hash -1427170164, now seen corresponding path program 1 times [2021-11-09 09:09:27,925 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:27,926 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1014537282] [2021-11-09 09:09:27,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:27,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:27,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:28,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:28,079 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:28,080 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1014537282] [2021-11-09 09:09:28,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1014537282] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:28,085 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [919223630] [2021-11-09 09:09:28,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:28,086 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:28,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:28,093 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:28,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-09 09:09:28,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:28,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-09 09:09:28,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:28,309 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:28,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [919223630] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:28,310 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:28,310 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-11-09 09:09:28,311 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786514875] [2021-11-09 09:09:28,312 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-09 09:09:28,312 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:28,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-09 09:09:28,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-09 09:09:28,315 INFO L87 Difference]: Start difference. First operand 14 states and 19 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:28,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:28,419 INFO L93 Difference]: Finished difference Result 38 states and 56 transitions. [2021-11-09 09:09:28,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-09 09:09:28,419 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-09 09:09:28,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:28,422 INFO L225 Difference]: With dead ends: 38 [2021-11-09 09:09:28,423 INFO L226 Difference]: Without dead ends: 30 [2021-11-09 09:09:28,423 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-09 09:09:28,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-09 09:09:28,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 26. [2021-11-09 09:09:28,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:28,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 37 transitions. [2021-11-09 09:09:28,433 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 37 transitions. Word has length 13 [2021-11-09 09:09:28,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:28,434 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 37 transitions. [2021-11-09 09:09:28,434 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:28,434 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 37 transitions. [2021-11-09 09:09:28,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-09 09:09:28,435 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:28,436 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:28,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:28,664 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:28,664 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:28,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:28,665 INFO L85 PathProgramCache]: Analyzing trace with hash 1160878727, now seen corresponding path program 2 times [2021-11-09 09:09:28,665 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:28,666 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567917167] [2021-11-09 09:09:28,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:28,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:28,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:28,810 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:28,811 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:28,811 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1567917167] [2021-11-09 09:09:28,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1567917167] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:28,813 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1044573927] [2021-11-09 09:09:28,813 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 09:09:28,813 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:28,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:28,815 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:28,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-09 09:09:28,877 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 09:09:28,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:09:28,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-09 09:09:28,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:28,992 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:28,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1044573927] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:28,993 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:28,993 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-11-09 09:09:28,993 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133749829] [2021-11-09 09:09:28,994 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-09 09:09:28,995 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:28,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-09 09:09:28,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-09 09:09:28,997 INFO L87 Difference]: Start difference. First operand 26 states and 37 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:29,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:29,126 INFO L93 Difference]: Finished difference Result 54 states and 82 transitions. [2021-11-09 09:09:29,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-09 09:09:29,127 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-09 09:09:29,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:29,130 INFO L225 Difference]: With dead ends: 54 [2021-11-09 09:09:29,130 INFO L226 Difference]: Without dead ends: 46 [2021-11-09 09:09:29,131 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-09 09:09:29,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-09 09:09:29,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 34. [2021-11-09 09:09:29,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.4848484848484849) internal successors, (49), 33 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:29,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 49 transitions. [2021-11-09 09:09:29,138 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 49 transitions. Word has length 14 [2021-11-09 09:09:29,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:29,139 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 49 transitions. [2021-11-09 09:09:29,139 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:29,139 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 49 transitions. [2021-11-09 09:09:29,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-09 09:09:29,140 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:29,140 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:29,178 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:29,364 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:29,364 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:29,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:29,365 INFO L85 PathProgramCache]: Analyzing trace with hash -603304611, now seen corresponding path program 1 times [2021-11-09 09:09:29,365 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:29,365 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1035156896] [2021-11-09 09:09:29,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:29,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:29,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:29,484 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:29,484 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:29,485 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1035156896] [2021-11-09 09:09:29,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1035156896] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:29,485 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1058648081] [2021-11-09 09:09:29,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:29,486 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:29,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:29,487 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:29,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-09 09:09:29,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:29,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-09 09:09:29,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:29,630 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:09:29,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1058648081] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:29,630 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:29,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4] total 9 [2021-11-09 09:09:29,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68319958] [2021-11-09 09:09:29,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-09 09:09:29,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:29,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-09 09:09:29,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-09 09:09:29,634 INFO L87 Difference]: Start difference. First operand 34 states and 49 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:29,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:29,985 INFO L93 Difference]: Finished difference Result 124 states and 173 transitions. [2021-11-09 09:09:29,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-09 09:09:29,986 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-09 09:09:29,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:29,989 INFO L225 Difference]: With dead ends: 124 [2021-11-09 09:09:29,989 INFO L226 Difference]: Without dead ends: 105 [2021-11-09 09:09:29,989 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2021-11-09 09:09:29,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-09 09:09:29,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 55. [2021-11-09 09:09:29,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.4074074074074074) internal successors, (76), 54 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:30,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 76 transitions. [2021-11-09 09:09:30,001 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 76 transitions. Word has length 15 [2021-11-09 09:09:30,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:30,001 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 76 transitions. [2021-11-09 09:09:30,001 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:30,002 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 76 transitions. [2021-11-09 09:09:30,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-09 09:09:30,003 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:30,003 INFO L513 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:30,040 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:30,218 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:30,218 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:30,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:30,219 INFO L85 PathProgramCache]: Analyzing trace with hash -213984276, now seen corresponding path program 3 times [2021-11-09 09:09:30,219 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:30,219 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858084101] [2021-11-09 09:09:30,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:30,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:30,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:30,342 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:30,343 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:30,343 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858084101] [2021-11-09 09:09:30,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858084101] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:30,343 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1523578199] [2021-11-09 09:09:30,343 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-09 09:09:30,343 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:30,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:30,350 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:30,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-09 09:09:30,412 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-09 09:09:30,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:09:30,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-09 09:09:30,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:30,509 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:30,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1523578199] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:30,509 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:30,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-11-09 09:09:30,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467875187] [2021-11-09 09:09:30,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-09 09:09:30,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:30,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-09 09:09:30,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-09 09:09:30,512 INFO L87 Difference]: Start difference. First operand 55 states and 76 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:30,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:30,646 INFO L93 Difference]: Finished difference Result 98 states and 147 transitions. [2021-11-09 09:09:30,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-09 09:09:30,647 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-09 09:09:30,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:30,649 INFO L225 Difference]: With dead ends: 98 [2021-11-09 09:09:30,649 INFO L226 Difference]: Without dead ends: 88 [2021-11-09 09:09:30,650 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-09 09:09:30,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-09 09:09:30,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 68. [2021-11-09 09:09:30,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.4179104477611941) internal successors, (95), 67 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:30,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 95 transitions. [2021-11-09 09:09:30,671 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 95 transitions. Word has length 15 [2021-11-09 09:09:30,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:30,671 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 95 transitions. [2021-11-09 09:09:30,671 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:30,671 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 95 transitions. [2021-11-09 09:09:30,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-09 09:09:30,673 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:30,673 INFO L513 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:30,711 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:30,904 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-09 09:09:30,904 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:30,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:30,905 INFO L85 PathProgramCache]: Analyzing trace with hash 114935591, now seen corresponding path program 4 times [2021-11-09 09:09:30,905 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:30,905 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917194739] [2021-11-09 09:09:30,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:30,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:30,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:31,013 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:31,013 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:31,013 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [917194739] [2021-11-09 09:09:31,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [917194739] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:31,013 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1931802386] [2021-11-09 09:09:31,014 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-09 09:09:31,014 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:31,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:31,015 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:31,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-09 09:09:31,085 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-09 09:09:31,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:09:31,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-09 09:09:31,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:31,188 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:31,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1931802386] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:31,189 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:31,189 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-11-09 09:09:31,189 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546235005] [2021-11-09 09:09:31,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-09 09:09:31,190 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:31,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-09 09:09:31,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-09 09:09:31,192 INFO L87 Difference]: Start difference. First operand 68 states and 95 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:31,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:31,362 INFO L93 Difference]: Finished difference Result 116 states and 176 transitions. [2021-11-09 09:09:31,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-09 09:09:31,363 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-09 09:09:31,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:31,363 INFO L225 Difference]: With dead ends: 116 [2021-11-09 09:09:31,364 INFO L226 Difference]: Without dead ends: 106 [2021-11-09 09:09:31,364 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-09 09:09:31,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-11-09 09:09:31,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 81. [2021-11-09 09:09:31,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 80 states have (on average 1.425) internal successors, (114), 80 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:31,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 114 transitions. [2021-11-09 09:09:31,372 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 114 transitions. Word has length 16 [2021-11-09 09:09:31,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:31,372 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 114 transitions. [2021-11-09 09:09:31,372 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:31,373 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 114 transitions. [2021-11-09 09:09:31,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-09 09:09:31,374 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:31,374 INFO L513 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:31,408 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:31,588 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:31,588 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:31,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:31,589 INFO L85 PathProgramCache]: Analyzing trace with hash 1721516876, now seen corresponding path program 5 times [2021-11-09 09:09:31,589 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:31,589 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719816309] [2021-11-09 09:09:31,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:31,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:31,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:31,741 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:31,741 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:31,741 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719816309] [2021-11-09 09:09:31,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [719816309] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:31,742 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1719496401] [2021-11-09 09:09:31,742 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-09 09:09:31,742 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:31,742 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:31,743 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:31,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-09 09:09:31,832 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-09 09:09:31,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:09:31,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-09 09:09:31,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:31,934 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:31,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1719496401] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:31,934 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:31,934 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2021-11-09 09:09:31,935 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292467684] [2021-11-09 09:09:31,935 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-09 09:09:31,935 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:31,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-09 09:09:31,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-11-09 09:09:31,936 INFO L87 Difference]: Start difference. First operand 81 states and 114 transitions. Second operand has 10 states, 10 states have (on average 1.9) internal successors, (19), 10 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:32,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:32,124 INFO L93 Difference]: Finished difference Result 134 states and 205 transitions. [2021-11-09 09:09:32,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-09 09:09:32,125 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.9) internal successors, (19), 10 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-09 09:09:32,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:32,125 INFO L225 Difference]: With dead ends: 134 [2021-11-09 09:09:32,125 INFO L226 Difference]: Without dead ends: 124 [2021-11-09 09:09:32,126 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-11-09 09:09:32,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-09 09:09:32,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 94. [2021-11-09 09:09:32,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 93 states have (on average 1.4301075268817205) internal successors, (133), 93 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:32,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 133 transitions. [2021-11-09 09:09:32,133 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 133 transitions. Word has length 17 [2021-11-09 09:09:32,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:32,134 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 133 transitions. [2021-11-09 09:09:32,140 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.9) internal successors, (19), 10 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:32,141 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 133 transitions. [2021-11-09 09:09:32,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-09 09:09:32,144 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:32,144 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:32,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:32,360 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-09 09:09:32,360 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:32,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:32,361 INFO L85 PathProgramCache]: Analyzing trace with hash 188466470, now seen corresponding path program 1 times [2021-11-09 09:09:32,361 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:32,361 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320540870] [2021-11-09 09:09:32,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:32,361 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:32,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:32,767 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:09:32,768 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:32,768 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320540870] [2021-11-09 09:09:32,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1320540870] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:32,768 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1568298228] [2021-11-09 09:09:32,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:32,768 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:32,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:32,769 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:32,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-09 09:09:32,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:32,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-09 09:09:32,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:33,283 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:33,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1568298228] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:33,283 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:33,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2021-11-09 09:09:33,286 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875466644] [2021-11-09 09:09:33,286 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-09 09:09:33,287 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:33,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-09 09:09:33,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-11-09 09:09:33,288 INFO L87 Difference]: Start difference. First operand 94 states and 133 transitions. Second operand has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:33,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:33,543 INFO L93 Difference]: Finished difference Result 116 states and 155 transitions. [2021-11-09 09:09:33,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-09 09:09:33,544 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-09 09:09:33,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:33,545 INFO L225 Difference]: With dead ends: 116 [2021-11-09 09:09:33,545 INFO L226 Difference]: Without dead ends: 106 [2021-11-09 09:09:33,545 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2021-11-09 09:09:33,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-11-09 09:09:33,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 94. [2021-11-09 09:09:33,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 93 states have (on average 1.4301075268817205) internal successors, (133), 93 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:33,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 133 transitions. [2021-11-09 09:09:33,552 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 133 transitions. Word has length 18 [2021-11-09 09:09:33,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:33,560 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 133 transitions. [2021-11-09 09:09:33,560 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:33,561 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 133 transitions. [2021-11-09 09:09:33,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-09 09:09:33,562 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:33,562 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:33,600 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:33,788 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-09 09:09:33,788 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:33,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:33,789 INFO L85 PathProgramCache]: Analyzing trace with hash 748617255, now seen corresponding path program 2 times [2021-11-09 09:09:33,789 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:33,789 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113983635] [2021-11-09 09:09:33,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:33,789 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:33,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:33,896 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:33,897 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:33,897 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113983635] [2021-11-09 09:09:33,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1113983635] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:33,897 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1790481819] [2021-11-09 09:09:33,897 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 09:09:33,897 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:33,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:33,898 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:33,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-09 09:09:34,003 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 09:09:34,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:09:34,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-09 09:09:34,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:34,095 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 09:09:34,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1790481819] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:34,095 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:34,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5] total 12 [2021-11-09 09:09:34,096 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990847976] [2021-11-09 09:09:34,097 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-09 09:09:34,098 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:34,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-09 09:09:34,105 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-11-09 09:09:34,105 INFO L87 Difference]: Start difference. First operand 94 states and 133 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:35,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:35,055 INFO L93 Difference]: Finished difference Result 304 states and 411 transitions. [2021-11-09 09:09:35,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-09 09:09:35,056 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-09 09:09:35,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:35,058 INFO L225 Difference]: With dead ends: 304 [2021-11-09 09:09:35,058 INFO L226 Difference]: Without dead ends: 271 [2021-11-09 09:09:35,060 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 450 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=253, Invalid=1553, Unknown=0, NotChecked=0, Total=1806 [2021-11-09 09:09:35,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2021-11-09 09:09:35,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 118. [2021-11-09 09:09:35,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.4102564102564104) internal successors, (165), 117 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:35,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 165 transitions. [2021-11-09 09:09:35,077 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 165 transitions. Word has length 18 [2021-11-09 09:09:35,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:35,078 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 165 transitions. [2021-11-09 09:09:35,078 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:35,078 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 165 transitions. [2021-11-09 09:09:35,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-09 09:09:35,081 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:35,081 INFO L513 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:35,121 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:35,304 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:35,304 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:35,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:35,305 INFO L85 PathProgramCache]: Analyzing trace with hash -14070841, now seen corresponding path program 6 times [2021-11-09 09:09:35,305 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:35,305 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942311187] [2021-11-09 09:09:35,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:35,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:35,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:35,427 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:35,427 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:35,427 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942311187] [2021-11-09 09:09:35,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1942311187] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:35,428 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1873633199] [2021-11-09 09:09:35,428 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-09 09:09:35,428 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:35,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:35,429 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:35,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-09 09:09:35,562 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-11-09 09:09:35,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:09:35,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-09 09:09:35,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:35,667 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:35,667 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1873633199] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:35,667 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:35,667 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2021-11-09 09:09:35,668 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245989238] [2021-11-09 09:09:35,668 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-09 09:09:35,668 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:35,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-09 09:09:35,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-11-09 09:09:35,669 INFO L87 Difference]: Start difference. First operand 118 states and 165 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:35,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:35,929 INFO L93 Difference]: Finished difference Result 183 states and 276 transitions. [2021-11-09 09:09:35,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-09 09:09:35,929 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-09 09:09:35,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:35,931 INFO L225 Difference]: With dead ends: 183 [2021-11-09 09:09:35,931 INFO L226 Difference]: Without dead ends: 173 [2021-11-09 09:09:35,931 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-11-09 09:09:35,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-11-09 09:09:35,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 134. [2021-11-09 09:09:35,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 133 states have (on average 1.4210526315789473) internal successors, (189), 133 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:35,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 189 transitions. [2021-11-09 09:09:35,939 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 189 transitions. Word has length 18 [2021-11-09 09:09:35,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:35,940 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 189 transitions. [2021-11-09 09:09:35,940 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:35,940 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 189 transitions. [2021-11-09 09:09:35,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-09 09:09:35,941 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:35,941 INFO L513 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:35,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:36,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:36,142 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:36,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:36,142 INFO L85 PathProgramCache]: Analyzing trace with hash 2017284780, now seen corresponding path program 7 times [2021-11-09 09:09:36,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:36,142 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [532594496] [2021-11-09 09:09:36,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:36,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:36,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:36,292 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:36,292 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:36,292 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [532594496] [2021-11-09 09:09:36,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [532594496] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:36,292 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1782255894] [2021-11-09 09:09:36,292 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-09 09:09:36,293 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:36,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:36,296 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:36,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-09 09:09:36,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:36,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-09 09:09:36,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:36,533 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:36,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1782255894] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:36,533 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:36,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-11-09 09:09:36,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460763836] [2021-11-09 09:09:36,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-09 09:09:36,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:36,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-09 09:09:36,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-11-09 09:09:36,535 INFO L87 Difference]: Start difference. First operand 134 states and 189 transitions. Second operand has 12 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:36,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:36,810 INFO L93 Difference]: Finished difference Result 204 states and 310 transitions. [2021-11-09 09:09:36,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-09 09:09:36,810 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-09 09:09:36,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:36,812 INFO L225 Difference]: With dead ends: 204 [2021-11-09 09:09:36,812 INFO L226 Difference]: Without dead ends: 194 [2021-11-09 09:09:36,813 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2021-11-09 09:09:36,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-11-09 09:09:36,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 150. [2021-11-09 09:09:36,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 149 states have (on average 1.429530201342282) internal successors, (213), 149 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:36,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 213 transitions. [2021-11-09 09:09:36,820 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 213 transitions. Word has length 19 [2021-11-09 09:09:36,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:36,821 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 213 transitions. [2021-11-09 09:09:36,821 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:36,821 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 213 transitions. [2021-11-09 09:09:36,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-09 09:09:36,824 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:36,824 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:36,864 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:37,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:37,025 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:37,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:37,025 INFO L85 PathProgramCache]: Analyzing trace with hash -1346970424, now seen corresponding path program 2 times [2021-11-09 09:09:37,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:37,026 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811514002] [2021-11-09 09:09:37,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:37,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:37,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:37,095 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-09 09:09:37,095 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:37,095 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811514002] [2021-11-09 09:09:37,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [811514002] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:37,095 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [573597323] [2021-11-09 09:09:37,095 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 09:09:37,096 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:37,096 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:37,097 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:37,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-09 09:09:37,218 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 09:09:37,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:09:37,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-09 09:09:37,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:37,295 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-09 09:09:37,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [573597323] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:37,295 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:37,295 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-11-09 09:09:37,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002379605] [2021-11-09 09:09:37,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-09 09:09:37,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:37,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-09 09:09:37,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-09 09:09:37,299 INFO L87 Difference]: Start difference. First operand 150 states and 213 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 4 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:37,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:37,331 INFO L93 Difference]: Finished difference Result 247 states and 346 transitions. [2021-11-09 09:09:37,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-09 09:09:37,332 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 4 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-09 09:09:37,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:37,333 INFO L225 Difference]: With dead ends: 247 [2021-11-09 09:09:37,333 INFO L226 Difference]: Without dead ends: 190 [2021-11-09 09:09:37,334 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-09 09:09:37,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-11-09 09:09:37,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 146. [2021-11-09 09:09:37,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.393103448275862) internal successors, (202), 145 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:37,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 202 transitions. [2021-11-09 09:09:37,342 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 202 transitions. Word has length 20 [2021-11-09 09:09:37,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:37,342 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 202 transitions. [2021-11-09 09:09:37,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 4 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:37,342 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 202 transitions. [2021-11-09 09:09:37,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-09 09:09:37,343 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:37,343 INFO L513 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:37,379 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:37,556 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:37,556 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:37,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:37,557 INFO L85 PathProgramCache]: Analyzing trace with hash 564799591, now seen corresponding path program 8 times [2021-11-09 09:09:37,557 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:37,557 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730694495] [2021-11-09 09:09:37,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:37,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:37,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:37,718 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:37,718 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:37,719 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730694495] [2021-11-09 09:09:37,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [730694495] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:37,719 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [754292582] [2021-11-09 09:09:37,719 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 09:09:37,719 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:37,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:37,721 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:37,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-09 09:09:37,848 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 09:09:37,848 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:09:37,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-09 09:09:37,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:37,953 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:37,953 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [754292582] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:37,954 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:37,954 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 12 [2021-11-09 09:09:37,954 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147892606] [2021-11-09 09:09:37,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-09 09:09:37,955 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:37,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-09 09:09:37,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-11-09 09:09:37,956 INFO L87 Difference]: Start difference. First operand 146 states and 202 transitions. Second operand has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 12 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:38,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:38,280 INFO L93 Difference]: Finished difference Result 231 states and 352 transitions. [2021-11-09 09:09:38,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-09 09:09:38,281 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 12 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-09 09:09:38,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:38,282 INFO L225 Difference]: With dead ends: 231 [2021-11-09 09:09:38,282 INFO L226 Difference]: Without dead ends: 217 [2021-11-09 09:09:38,283 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-11-09 09:09:38,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-11-09 09:09:38,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 162. [2021-11-09 09:09:38,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 161 states have (on average 1.3975155279503106) internal successors, (225), 161 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:38,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 225 transitions. [2021-11-09 09:09:38,300 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 225 transitions. Word has length 20 [2021-11-09 09:09:38,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:38,300 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 225 transitions. [2021-11-09 09:09:38,300 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 12 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:38,301 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 225 transitions. [2021-11-09 09:09:38,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-09 09:09:38,303 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:38,304 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:38,340 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:38,520 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-09 09:09:38,520 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:38,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:38,521 INFO L85 PathProgramCache]: Analyzing trace with hash 48319293, now seen corresponding path program 1 times [2021-11-09 09:09:38,521 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:38,521 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656905672] [2021-11-09 09:09:38,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:38,521 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:38,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:38,627 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-09 09:09:38,628 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:38,628 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656905672] [2021-11-09 09:09:38,628 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1656905672] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:38,628 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033401150] [2021-11-09 09:09:38,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:38,629 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:38,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:38,630 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:38,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-09 09:09:38,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:38,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-09 09:09:38,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:38,883 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-09 09:09:38,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033401150] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:38,883 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:38,883 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2021-11-09 09:09:38,884 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195809828] [2021-11-09 09:09:38,884 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-09 09:09:38,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:38,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-09 09:09:38,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-09 09:09:38,885 INFO L87 Difference]: Start difference. First operand 162 states and 225 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:39,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:39,010 INFO L93 Difference]: Finished difference Result 200 states and 270 transitions. [2021-11-09 09:09:39,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-09 09:09:39,011 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-09 09:09:39,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:39,012 INFO L225 Difference]: With dead ends: 200 [2021-11-09 09:09:39,012 INFO L226 Difference]: Without dead ends: 187 [2021-11-09 09:09:39,013 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-09 09:09:39,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-11-09 09:09:39,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 162. [2021-11-09 09:09:39,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 161 states have (on average 1.391304347826087) internal successors, (224), 161 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:39,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 224 transitions. [2021-11-09 09:09:39,021 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 224 transitions. Word has length 21 [2021-11-09 09:09:39,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:39,021 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 224 transitions. [2021-11-09 09:09:39,021 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:39,022 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 224 transitions. [2021-11-09 09:09:39,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-09 09:09:39,022 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:39,023 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:39,060 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:39,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-09 09:09:39,223 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:39,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:39,224 INFO L85 PathProgramCache]: Analyzing trace with hash 1411583389, now seen corresponding path program 3 times [2021-11-09 09:09:39,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:39,224 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47389808] [2021-11-09 09:09:39,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:39,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:39,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:39,414 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:39,414 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:39,414 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47389808] [2021-11-09 09:09:39,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [47389808] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:39,415 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [68355452] [2021-11-09 09:09:39,415 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-09 09:09:39,415 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:39,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:39,416 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:39,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-09 09:09:39,576 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-09 09:09:39,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:09:39,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-09 09:09:39,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:39,717 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-09 09:09:39,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [68355452] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:39,718 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:39,718 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 15 [2021-11-09 09:09:39,718 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827004546] [2021-11-09 09:09:39,718 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-09 09:09:39,718 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:39,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-09 09:09:39,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-11-09 09:09:39,719 INFO L87 Difference]: Start difference. First operand 162 states and 224 transitions. Second operand has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:41,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:41,681 INFO L93 Difference]: Finished difference Result 517 states and 694 transitions. [2021-11-09 09:09:41,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-09 09:09:41,682 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-09 09:09:41,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:41,684 INFO L225 Difference]: With dead ends: 517 [2021-11-09 09:09:41,684 INFO L226 Difference]: Without dead ends: 473 [2021-11-09 09:09:41,687 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1515 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=524, Invalid=4446, Unknown=0, NotChecked=0, Total=4970 [2021-11-09 09:09:41,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 473 states. [2021-11-09 09:09:41,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 473 to 191. [2021-11-09 09:09:41,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 190 states have (on average 1.4) internal successors, (266), 190 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:41,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 266 transitions. [2021-11-09 09:09:41,699 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 266 transitions. Word has length 21 [2021-11-09 09:09:41,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:41,700 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 266 transitions. [2021-11-09 09:09:41,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:41,700 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 266 transitions. [2021-11-09 09:09:41,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-09 09:09:41,701 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:41,701 INFO L513 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:41,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:41,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-09 09:09:41,915 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:41,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:41,916 INFO L85 PathProgramCache]: Analyzing trace with hash -1512568308, now seen corresponding path program 9 times [2021-11-09 09:09:41,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:41,916 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [304921136] [2021-11-09 09:09:41,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:41,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:41,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:42,083 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:42,083 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:42,084 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [304921136] [2021-11-09 09:09:42,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [304921136] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:42,084 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [303020504] [2021-11-09 09:09:42,084 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-09 09:09:42,084 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:42,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:42,088 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:42,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-09 09:09:42,309 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-09 09:09:42,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:09:42,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-09 09:09:42,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:42,443 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:42,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [303020504] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:42,444 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:42,444 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2021-11-09 09:09:42,444 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379117025] [2021-11-09 09:09:42,444 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-09 09:09:42,445 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:42,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-09 09:09:42,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2021-11-09 09:09:42,446 INFO L87 Difference]: Start difference. First operand 191 states and 266 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:42,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:42,833 INFO L93 Difference]: Finished difference Result 285 states and 433 transitions. [2021-11-09 09:09:42,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-09 09:09:42,834 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-09 09:09:42,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:42,836 INFO L225 Difference]: With dead ends: 285 [2021-11-09 09:09:42,836 INFO L226 Difference]: Without dead ends: 271 [2021-11-09 09:09:42,836 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-11-09 09:09:42,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2021-11-09 09:09:42,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 210. [2021-11-09 09:09:42,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 209 states have (on average 1.4066985645933014) internal successors, (294), 209 states have internal predecessors, (294), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:42,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 294 transitions. [2021-11-09 09:09:42,847 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 294 transitions. Word has length 21 [2021-11-09 09:09:42,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:42,848 INFO L470 AbstractCegarLoop]: Abstraction has 210 states and 294 transitions. [2021-11-09 09:09:42,848 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:42,848 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 294 transitions. [2021-11-09 09:09:42,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-09 09:09:42,849 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:42,849 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:42,888 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:43,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:43,072 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:43,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:43,073 INFO L85 PathProgramCache]: Analyzing trace with hash 1372519271, now seen corresponding path program 3 times [2021-11-09 09:09:43,073 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:43,073 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [883975310] [2021-11-09 09:09:43,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:43,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:43,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:43,144 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-09 09:09:43,144 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:43,145 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [883975310] [2021-11-09 09:09:43,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [883975310] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:43,145 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [198839181] [2021-11-09 09:09:43,145 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-09 09:09:43,145 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:43,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:43,161 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:43,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-09 09:09:43,320 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-09 09:09:43,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:09:43,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-09 09:09:43,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:43,403 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-09 09:09:43,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [198839181] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:43,404 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:43,404 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2021-11-09 09:09:43,404 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892256865] [2021-11-09 09:09:43,405 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-09 09:09:43,405 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:43,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-09 09:09:43,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-09 09:09:43,406 INFO L87 Difference]: Start difference. First operand 210 states and 294 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:43,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:43,478 INFO L93 Difference]: Finished difference Result 344 states and 467 transitions. [2021-11-09 09:09:43,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-09 09:09:43,479 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-09 09:09:43,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:43,481 INFO L225 Difference]: With dead ends: 344 [2021-11-09 09:09:43,481 INFO L226 Difference]: Without dead ends: 332 [2021-11-09 09:09:43,481 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-09 09:09:43,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2021-11-09 09:09:43,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 224. [2021-11-09 09:09:43,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 223 states have (on average 1.3811659192825112) internal successors, (308), 223 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:43,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 308 transitions. [2021-11-09 09:09:43,493 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 308 transitions. Word has length 22 [2021-11-09 09:09:43,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:43,494 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 308 transitions. [2021-11-09 09:09:43,494 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:43,494 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 308 transitions. [2021-11-09 09:09:43,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-09 09:09:43,495 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:43,495 INFO L513 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:43,532 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:43,712 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-09 09:09:43,713 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:43,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:43,713 INFO L85 PathProgramCache]: Analyzing trace with hash -1486463737, now seen corresponding path program 10 times [2021-11-09 09:09:43,713 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:43,713 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [587221392] [2021-11-09 09:09:43,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:43,713 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:43,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:43,892 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:43,892 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:43,892 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [587221392] [2021-11-09 09:09:43,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [587221392] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:43,892 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [672117076] [2021-11-09 09:09:43,892 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-09 09:09:43,893 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:43,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:43,896 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:43,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-09 09:09:44,071 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-09 09:09:44,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:09:44,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-09 09:09:44,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:44,202 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:44,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [672117076] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:44,202 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:44,203 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-11-09 09:09:44,203 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936208159] [2021-11-09 09:09:44,204 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-09 09:09:44,204 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:44,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-09 09:09:44,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-11-09 09:09:44,205 INFO L87 Difference]: Start difference. First operand 224 states and 308 transitions. Second operand has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:44,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:44,696 INFO L93 Difference]: Finished difference Result 339 states and 514 transitions. [2021-11-09 09:09:44,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-09 09:09:44,696 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-09 09:09:44,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:44,698 INFO L225 Difference]: With dead ends: 339 [2021-11-09 09:09:44,698 INFO L226 Difference]: Without dead ends: 323 [2021-11-09 09:09:44,699 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=207, Unknown=0, NotChecked=0, Total=240 [2021-11-09 09:09:44,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2021-11-09 09:09:44,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 244. [2021-11-09 09:09:44,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 243 states have (on average 1.3868312757201646) internal successors, (337), 243 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:44,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 337 transitions. [2021-11-09 09:09:44,711 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 337 transitions. Word has length 22 [2021-11-09 09:09:44,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:44,711 INFO L470 AbstractCegarLoop]: Abstraction has 244 states and 337 transitions. [2021-11-09 09:09:44,711 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:44,711 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 337 transitions. [2021-11-09 09:09:44,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-09 09:09:44,712 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:44,713 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:44,746 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:44,926 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:44,926 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:44,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:44,927 INFO L85 PathProgramCache]: Analyzing trace with hash 1583718253, now seen corresponding path program 2 times [2021-11-09 09:09:44,927 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:44,927 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [343108890] [2021-11-09 09:09:44,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:44,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:44,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:45,036 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-09 09:09:45,036 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:45,036 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [343108890] [2021-11-09 09:09:45,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [343108890] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:45,037 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [275637185] [2021-11-09 09:09:45,037 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 09:09:45,037 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:45,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:45,040 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:45,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-09 09:09:45,240 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 09:09:45,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:09:45,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-09 09:09:45,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:45,413 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-09 09:09:45,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [275637185] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:45,413 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:45,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 13 [2021-11-09 09:09:45,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213052856] [2021-11-09 09:09:45,414 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-09 09:09:45,414 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:45,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-09 09:09:45,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2021-11-09 09:09:45,415 INFO L87 Difference]: Start difference. First operand 244 states and 337 transitions. Second operand has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:45,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:45,673 INFO L93 Difference]: Finished difference Result 295 states and 397 transitions. [2021-11-09 09:09:45,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-09 09:09:45,674 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-09 09:09:45,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:45,676 INFO L225 Difference]: With dead ends: 295 [2021-11-09 09:09:45,676 INFO L226 Difference]: Without dead ends: 281 [2021-11-09 09:09:45,676 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-11-09 09:09:45,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2021-11-09 09:09:45,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 244. [2021-11-09 09:09:45,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 243 states have (on average 1.382716049382716) internal successors, (336), 243 states have internal predecessors, (336), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:45,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 336 transitions. [2021-11-09 09:09:45,689 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 336 transitions. Word has length 23 [2021-11-09 09:09:45,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:45,689 INFO L470 AbstractCegarLoop]: Abstraction has 244 states and 336 transitions. [2021-11-09 09:09:45,690 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:45,690 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 336 transitions. [2021-11-09 09:09:45,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-09 09:09:45,691 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:45,691 INFO L513 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:45,728 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:45,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:45,912 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:45,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:45,912 INFO L85 PathProgramCache]: Analyzing trace with hash -677222036, now seen corresponding path program 11 times [2021-11-09 09:09:45,913 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:45,913 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [99342850] [2021-11-09 09:09:45,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:45,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:45,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:46,124 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:46,125 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:46,125 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [99342850] [2021-11-09 09:09:46,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [99342850] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:46,125 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [400521644] [2021-11-09 09:09:46,125 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-09 09:09:46,125 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:46,126 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:46,132 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:46,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-09 09:09:46,796 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-11-09 09:09:46,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:09:46,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-09 09:09:46,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:46,928 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:46,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [400521644] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:46,928 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:46,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 15 [2021-11-09 09:09:46,929 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892072513] [2021-11-09 09:09:46,929 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-09 09:09:46,929 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:46,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-09 09:09:46,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-11-09 09:09:46,930 INFO L87 Difference]: Start difference. First operand 244 states and 336 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:47,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:47,398 INFO L93 Difference]: Finished difference Result 366 states and 556 transitions. [2021-11-09 09:09:47,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-09 09:09:47,399 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-09 09:09:47,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:47,401 INFO L225 Difference]: With dead ends: 366 [2021-11-09 09:09:47,401 INFO L226 Difference]: Without dead ends: 350 [2021-11-09 09:09:47,402 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2021-11-09 09:09:47,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2021-11-09 09:09:47,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 264. [2021-11-09 09:09:47,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 263 states have (on average 1.3878326996197718) internal successors, (365), 263 states have internal predecessors, (365), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:47,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 365 transitions. [2021-11-09 09:09:47,415 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 365 transitions. Word has length 23 [2021-11-09 09:09:47,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:47,415 INFO L470 AbstractCegarLoop]: Abstraction has 264 states and 365 transitions. [2021-11-09 09:09:47,416 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:47,416 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 365 transitions. [2021-11-09 09:09:47,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-09 09:09:47,417 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:47,417 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:47,425 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:47,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:47,625 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:47,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:47,625 INFO L85 PathProgramCache]: Analyzing trace with hash -11866489, now seen corresponding path program 4 times [2021-11-09 09:09:47,626 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:47,626 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137906678] [2021-11-09 09:09:47,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:47,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:47,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:47,970 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 09:09:47,970 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:47,971 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [137906678] [2021-11-09 09:09:47,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [137906678] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:47,971 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [181666895] [2021-11-09 09:09:47,971 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-09 09:09:47,971 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:47,971 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:47,972 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:47,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-09 09:09:48,216 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-09 09:09:48,216 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:09:48,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-09 09:09:48,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:49,978 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 09:09:49,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [181666895] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:49,979 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:49,979 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 13 [2021-11-09 09:09:49,979 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829433852] [2021-11-09 09:09:49,980 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-09 09:09:49,980 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:49,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-09 09:09:49,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2021-11-09 09:09:49,981 INFO L87 Difference]: Start difference. First operand 264 states and 365 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:50,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:50,993 INFO L93 Difference]: Finished difference Result 342 states and 443 transitions. [2021-11-09 09:09:50,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-09 09:09:50,994 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-09 09:09:50,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:50,996 INFO L225 Difference]: With dead ends: 342 [2021-11-09 09:09:50,996 INFO L226 Difference]: Without dead ends: 332 [2021-11-09 09:09:50,997 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-11-09 09:09:50,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2021-11-09 09:09:51,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 270. [2021-11-09 09:09:51,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 269 states have (on average 1.3828996282527881) internal successors, (372), 269 states have internal predecessors, (372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:51,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 372 transitions. [2021-11-09 09:09:51,012 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 372 transitions. Word has length 24 [2021-11-09 09:09:51,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:51,012 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 372 transitions. [2021-11-09 09:09:51,012 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:51,012 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 372 transitions. [2021-11-09 09:09:51,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-09 09:09:51,013 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:51,014 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:51,049 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:51,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:51,235 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:51,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:51,235 INFO L85 PathProgramCache]: Analyzing trace with hash -147642777, now seen corresponding path program 4 times [2021-11-09 09:09:51,236 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:51,236 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2054169807] [2021-11-09 09:09:51,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:51,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:51,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:51,397 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:51,397 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:51,398 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2054169807] [2021-11-09 09:09:51,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2054169807] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:51,398 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1767624625] [2021-11-09 09:09:51,398 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-09 09:09:51,398 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:51,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:51,399 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:51,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-09 09:09:51,618 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-09 09:09:51,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:09:51,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-09 09:09:51,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:51,770 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-09 09:09:51,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1767624625] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:51,771 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:51,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 7] total 18 [2021-11-09 09:09:51,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497964961] [2021-11-09 09:09:51,771 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-09 09:09:51,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:51,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-09 09:09:51,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2021-11-09 09:09:51,773 INFO L87 Difference]: Start difference. First operand 270 states and 372 transitions. Second operand has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:56,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:56,950 INFO L93 Difference]: Finished difference Result 905 states and 1179 transitions. [2021-11-09 09:09:56,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-11-09 09:09:56,951 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-09 09:09:56,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:56,956 INFO L225 Difference]: With dead ends: 905 [2021-11-09 09:09:56,956 INFO L226 Difference]: Without dead ends: 843 [2021-11-09 09:09:56,962 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5746 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=1243, Invalid=14507, Unknown=0, NotChecked=0, Total=15750 [2021-11-09 09:09:56,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 843 states. [2021-11-09 09:09:56,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 843 to 308. [2021-11-09 09:09:56,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 308 states, 307 states have (on average 1.3908794788273615) internal successors, (427), 307 states have internal predecessors, (427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:56,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 427 transitions. [2021-11-09 09:09:56,989 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 427 transitions. Word has length 24 [2021-11-09 09:09:56,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:56,989 INFO L470 AbstractCegarLoop]: Abstraction has 308 states and 427 transitions. [2021-11-09 09:09:56,990 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:56,990 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 427 transitions. [2021-11-09 09:09:56,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-09 09:09:56,991 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:56,991 INFO L513 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:57,015 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:57,204 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-09 09:09:57,204 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:57,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:57,205 INFO L85 PathProgramCache]: Analyzing trace with hash -1360533081, now seen corresponding path program 12 times [2021-11-09 09:09:57,205 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:57,205 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1802144031] [2021-11-09 09:09:57,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:57,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:57,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:57,425 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:57,425 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:57,425 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1802144031] [2021-11-09 09:09:57,425 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1802144031] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:57,426 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [535027599] [2021-11-09 09:09:57,426 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-09 09:09:57,426 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:57,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:57,428 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:57,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-09 09:09:57,781 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-09 09:09:57,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:09:57,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-09 09:09:57,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:57,918 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:57,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [535027599] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:57,919 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:57,919 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2021-11-09 09:09:57,919 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487006921] [2021-11-09 09:09:57,921 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-09 09:09:57,921 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:57,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-09 09:09:57,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2021-11-09 09:09:57,922 INFO L87 Difference]: Start difference. First operand 308 states and 427 transitions. Second operand has 17 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 17 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:58,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:58,454 INFO L93 Difference]: Finished difference Result 446 states and 674 transitions. [2021-11-09 09:09:58,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-09 09:09:58,454 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 17 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-09 09:09:58,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:58,456 INFO L225 Difference]: With dead ends: 446 [2021-11-09 09:09:58,457 INFO L226 Difference]: Without dead ends: 430 [2021-11-09 09:09:58,457 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=269, Unknown=0, NotChecked=0, Total=306 [2021-11-09 09:09:58,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2021-11-09 09:09:58,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 331. [2021-11-09 09:09:58,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 330 states have (on average 1.396969696969697) internal successors, (461), 330 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:58,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 461 transitions. [2021-11-09 09:09:58,473 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 461 transitions. Word has length 24 [2021-11-09 09:09:58,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:58,473 INFO L470 AbstractCegarLoop]: Abstraction has 331 states and 461 transitions. [2021-11-09 09:09:58,473 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 17 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:58,474 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 461 transitions. [2021-11-09 09:09:58,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-09 09:09:58,474 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:58,475 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:58,480 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:58,679 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-09 09:09:58,679 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:58,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:58,679 INFO L85 PathProgramCache]: Analyzing trace with hash 1419398141, now seen corresponding path program 3 times [2021-11-09 09:09:58,679 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:58,679 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [282903988] [2021-11-09 09:09:58,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:58,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:58,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:58,801 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-09 09:09:58,801 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:58,801 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [282903988] [2021-11-09 09:09:58,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [282903988] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:58,801 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [613859519] [2021-11-09 09:09:58,801 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-09 09:09:58,801 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:58,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:58,802 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:58,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-09 09:09:59,043 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-09 09:09:59,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:09:59,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-09 09:09:59,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:59,143 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-09 09:09:59,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [613859519] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:59,144 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:59,144 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6] total 14 [2021-11-09 09:09:59,144 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645735382] [2021-11-09 09:09:59,145 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-09 09:09:59,145 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:59,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-09 09:09:59,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-11-09 09:09:59,146 INFO L87 Difference]: Start difference. First operand 331 states and 461 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:59,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:59,540 INFO L93 Difference]: Finished difference Result 416 states and 569 transitions. [2021-11-09 09:09:59,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-09 09:09:59,540 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-09 09:09:59,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:59,542 INFO L225 Difference]: With dead ends: 416 [2021-11-09 09:09:59,542 INFO L226 Difference]: Without dead ends: 376 [2021-11-09 09:09:59,543 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=72, Invalid=480, Unknown=0, NotChecked=0, Total=552 [2021-11-09 09:09:59,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2021-11-09 09:09:59,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 322. [2021-11-09 09:09:59,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 321 states have (on average 1.3831775700934579) internal successors, (444), 321 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:59,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 444 transitions. [2021-11-09 09:09:59,558 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 444 transitions. Word has length 25 [2021-11-09 09:09:59,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:59,558 INFO L470 AbstractCegarLoop]: Abstraction has 322 states and 444 transitions. [2021-11-09 09:09:59,558 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:09:59,558 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 444 transitions. [2021-11-09 09:09:59,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-09 09:09:59,559 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:59,560 INFO L513 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:59,586 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:59,776 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-09 09:09:59,776 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:09:59,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:59,776 INFO L85 PathProgramCache]: Analyzing trace with hash -1068338996, now seen corresponding path program 13 times [2021-11-09 09:09:59,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:59,777 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411726224] [2021-11-09 09:09:59,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:59,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:59,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:00,027 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:00,027 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:00,027 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411726224] [2021-11-09 09:10:00,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411726224] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:00,028 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [31472491] [2021-11-09 09:10:00,028 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-09 09:10:00,028 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:00,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:00,032 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:00,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-09 09:10:00,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:00,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-09 09:10:00,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:00,459 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:00,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [31472491] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:00,459 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:00,459 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2021-11-09 09:10:00,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424087461] [2021-11-09 09:10:00,461 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-09 09:10:00,461 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:00,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-09 09:10:00,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2021-11-09 09:10:00,462 INFO L87 Difference]: Start difference. First operand 322 states and 444 transitions. Second operand has 18 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:01,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:01,022 INFO L93 Difference]: Finished difference Result 463 states and 689 transitions. [2021-11-09 09:10:01,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-09 09:10:01,023 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-09 09:10:01,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:01,025 INFO L225 Difference]: With dead ends: 463 [2021-11-09 09:10:01,025 INFO L226 Difference]: Without dead ends: 437 [2021-11-09 09:10:01,025 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=303, Unknown=0, NotChecked=0, Total=342 [2021-11-09 09:10:01,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2021-11-09 09:10:01,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 344. [2021-11-09 09:10:01,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 343 states have (on average 1.3877551020408163) internal successors, (476), 343 states have internal predecessors, (476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:01,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 476 transitions. [2021-11-09 09:10:01,041 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 476 transitions. Word has length 25 [2021-11-09 09:10:01,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:01,041 INFO L470 AbstractCegarLoop]: Abstraction has 344 states and 476 transitions. [2021-11-09 09:10:01,042 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:01,042 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 476 transitions. [2021-11-09 09:10:01,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-09 09:10:01,043 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:01,043 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:01,080 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-09 09:10:01,268 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:01,268 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:01,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:01,268 INFO L85 PathProgramCache]: Analyzing trace with hash -1118410521, now seen corresponding path program 5 times [2021-11-09 09:10:01,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:01,269 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [403767775] [2021-11-09 09:10:01,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:01,269 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:01,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:01,335 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-09 09:10:01,335 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:01,335 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [403767775] [2021-11-09 09:10:01,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [403767775] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:01,335 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752301912] [2021-11-09 09:10:01,335 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-09 09:10:01,336 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:01,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:01,336 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:01,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-09 09:10:01,613 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-11-09 09:10:01,613 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:10:01,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-09 09:10:01,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:01,708 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-09 09:10:01,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1752301912] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:01,708 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:01,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2021-11-09 09:10:01,709 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358338933] [2021-11-09 09:10:01,709 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-09 09:10:01,709 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:01,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-09 09:10:01,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-09 09:10:01,711 INFO L87 Difference]: Start difference. First operand 344 states and 476 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:01,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:01,773 INFO L93 Difference]: Finished difference Result 566 states and 769 transitions. [2021-11-09 09:10:01,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-09 09:10:01,776 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-09 09:10:01,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:01,779 INFO L225 Difference]: With dead ends: 566 [2021-11-09 09:10:01,779 INFO L226 Difference]: Without dead ends: 462 [2021-11-09 09:10:01,780 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-09 09:10:01,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2021-11-09 09:10:01,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 318. [2021-11-09 09:10:01,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 318 states, 317 states have (on average 1.3722397476340693) internal successors, (435), 317 states have internal predecessors, (435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:01,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 435 transitions. [2021-11-09 09:10:01,804 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 435 transitions. Word has length 26 [2021-11-09 09:10:01,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:01,804 INFO L470 AbstractCegarLoop]: Abstraction has 318 states and 435 transitions. [2021-11-09 09:10:01,804 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:01,804 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 435 transitions. [2021-11-09 09:10:01,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-09 09:10:01,807 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:01,807 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:01,836 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2021-11-09 09:10:02,023 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-09 09:10:02,024 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:02,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:02,024 INFO L85 PathProgramCache]: Analyzing trace with hash -1999602746, now seen corresponding path program 6 times [2021-11-09 09:10:02,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:02,024 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1850318395] [2021-11-09 09:10:02,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:02,024 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:02,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:02,128 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-09 09:10:02,128 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:02,128 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1850318395] [2021-11-09 09:10:02,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1850318395] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:02,128 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542431856] [2021-11-09 09:10:02,128 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-09 09:10:02,129 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:02,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:02,130 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:02,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-09 09:10:02,441 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-11-09 09:10:02,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:10:02,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-09 09:10:02,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:02,552 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-09 09:10:02,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542431856] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:02,553 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:02,553 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 12 [2021-11-09 09:10:02,553 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98044701] [2021-11-09 09:10:02,553 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-09 09:10:02,554 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:02,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-09 09:10:02,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-11-09 09:10:02,554 INFO L87 Difference]: Start difference. First operand 318 states and 435 transitions. Second operand has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:02,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:02,732 INFO L93 Difference]: Finished difference Result 575 states and 778 transitions. [2021-11-09 09:10:02,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-09 09:10:02,732 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-09 09:10:02,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:02,735 INFO L225 Difference]: With dead ends: 575 [2021-11-09 09:10:02,735 INFO L226 Difference]: Without dead ends: 555 [2021-11-09 09:10:02,735 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2021-11-09 09:10:02,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2021-11-09 09:10:02,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 334. [2021-11-09 09:10:02,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 333 states have (on average 1.3483483483483483) internal successors, (449), 333 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:02,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 449 transitions. [2021-11-09 09:10:02,752 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 449 transitions. Word has length 26 [2021-11-09 09:10:02,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:02,752 INFO L470 AbstractCegarLoop]: Abstraction has 334 states and 449 transitions. [2021-11-09 09:10:02,752 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:02,752 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 449 transitions. [2021-11-09 09:10:02,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-09 09:10:02,753 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:02,754 INFO L513 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:02,779 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-09 09:10:02,968 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-09 09:10:02,968 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:02,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:02,969 INFO L85 PathProgramCache]: Analyzing trace with hash -600256953, now seen corresponding path program 14 times [2021-11-09 09:10:02,969 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:02,969 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1348565718] [2021-11-09 09:10:02,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:02,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:02,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:03,214 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:03,214 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:03,214 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1348565718] [2021-11-09 09:10:03,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1348565718] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:03,214 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [99146341] [2021-11-09 09:10:03,214 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 09:10:03,214 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:03,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:03,215 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:03,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-09 09:10:03,480 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 09:10:03,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:10:03,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-09 09:10:03,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:03,629 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:03,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [99146341] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:03,630 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:03,630 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2021-11-09 09:10:03,630 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867169250] [2021-11-09 09:10:03,630 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-09 09:10:03,630 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:03,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-09 09:10:03,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2021-11-09 09:10:03,631 INFO L87 Difference]: Start difference. First operand 334 states and 449 transitions. Second operand has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:04,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:04,288 INFO L93 Difference]: Finished difference Result 498 states and 736 transitions. [2021-11-09 09:10:04,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-09 09:10:04,289 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-09 09:10:04,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:04,291 INFO L225 Difference]: With dead ends: 498 [2021-11-09 09:10:04,291 INFO L226 Difference]: Without dead ends: 468 [2021-11-09 09:10:04,291 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=339, Unknown=0, NotChecked=0, Total=380 [2021-11-09 09:10:04,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 468 states. [2021-11-09 09:10:04,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 468 to 356. [2021-11-09 09:10:04,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 356 states, 355 states have (on average 1.352112676056338) internal successors, (480), 355 states have internal predecessors, (480), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:04,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 356 states to 356 states and 480 transitions. [2021-11-09 09:10:04,306 INFO L78 Accepts]: Start accepts. Automaton has 356 states and 480 transitions. Word has length 26 [2021-11-09 09:10:04,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:04,307 INFO L470 AbstractCegarLoop]: Abstraction has 356 states and 480 transitions. [2021-11-09 09:10:04,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:04,307 INFO L276 IsEmpty]: Start isEmpty. Operand 356 states and 480 transitions. [2021-11-09 09:10:04,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-09 09:10:04,308 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:04,308 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:04,347 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-09 09:10:04,526 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-09 09:10:04,526 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:04,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:04,526 INFO L85 PathProgramCache]: Analyzing trace with hash -833380899, now seen corresponding path program 5 times [2021-11-09 09:10:04,527 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:04,527 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1333216824] [2021-11-09 09:10:04,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:04,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:04,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:04,745 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:04,746 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:04,746 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1333216824] [2021-11-09 09:10:04,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1333216824] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:04,746 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1452566837] [2021-11-09 09:10:04,746 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-09 09:10:04,746 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:04,746 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:04,748 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:04,766 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-09 09:10:05,189 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-09 09:10:05,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:10:05,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-09 09:10:05,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:05,362 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-09 09:10:05,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1452566837] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:05,362 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:05,362 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8] total 21 [2021-11-09 09:10:05,362 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697842560] [2021-11-09 09:10:05,363 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-09 09:10:05,363 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:05,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-09 09:10:05,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2021-11-09 09:10:05,364 INFO L87 Difference]: Start difference. First operand 356 states and 480 transitions. Second operand has 21 states, 21 states have (on average 2.142857142857143) internal successors, (45), 21 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:15,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:15,185 INFO L93 Difference]: Finished difference Result 1253 states and 1620 transitions. [2021-11-09 09:10:15,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 152 states. [2021-11-09 09:10:15,186 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.142857142857143) internal successors, (45), 21 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-11-09 09:10:15,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:15,190 INFO L225 Difference]: With dead ends: 1253 [2021-11-09 09:10:15,190 INFO L226 Difference]: Without dead ends: 1168 [2021-11-09 09:10:15,200 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10692 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=1863, Invalid=26193, Unknown=0, NotChecked=0, Total=28056 [2021-11-09 09:10:15,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1168 states. [2021-11-09 09:10:15,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1168 to 426. [2021-11-09 09:10:15,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 426 states, 425 states have (on average 1.3458823529411765) internal successors, (572), 425 states have internal predecessors, (572), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:15,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 426 states to 426 states and 572 transitions. [2021-11-09 09:10:15,237 INFO L78 Accepts]: Start accepts. Automaton has 426 states and 572 transitions. Word has length 27 [2021-11-09 09:10:15,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:15,237 INFO L470 AbstractCegarLoop]: Abstraction has 426 states and 572 transitions. [2021-11-09 09:10:15,238 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.142857142857143) internal successors, (45), 21 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:15,238 INFO L276 IsEmpty]: Start isEmpty. Operand 426 states and 572 transitions. [2021-11-09 09:10:15,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-09 09:10:15,239 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:15,239 INFO L513 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:15,247 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-09 09:10:15,444 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:15,444 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:15,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:15,445 INFO L85 PathProgramCache]: Analyzing trace with hash 1025384492, now seen corresponding path program 15 times [2021-11-09 09:10:15,445 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:15,445 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981452221] [2021-11-09 09:10:15,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:15,445 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:15,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:15,733 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:15,733 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:15,733 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981452221] [2021-11-09 09:10:15,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [981452221] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:15,733 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2094518725] [2021-11-09 09:10:15,733 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-09 09:10:15,733 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:15,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:15,734 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:15,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-09 09:10:16,351 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-09 09:10:16,351 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:10:16,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-09 09:10:16,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:16,526 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:16,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2094518725] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:16,527 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:16,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2021-11-09 09:10:16,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418985372] [2021-11-09 09:10:16,527 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-09 09:10:16,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:16,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-09 09:10:16,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2021-11-09 09:10:16,529 INFO L87 Difference]: Start difference. First operand 426 states and 572 transitions. Second operand has 20 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:17,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:17,219 INFO L93 Difference]: Finished difference Result 619 states and 914 transitions. [2021-11-09 09:10:17,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-09 09:10:17,220 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-11-09 09:10:17,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:17,222 INFO L225 Difference]: With dead ends: 619 [2021-11-09 09:10:17,222 INFO L226 Difference]: Without dead ends: 587 [2021-11-09 09:10:17,223 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=377, Unknown=0, NotChecked=0, Total=420 [2021-11-09 09:10:17,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 587 states. [2021-11-09 09:10:17,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 587 to 452. [2021-11-09 09:10:17,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 451 states have (on average 1.3503325942350333) internal successors, (609), 451 states have internal predecessors, (609), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:17,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 609 transitions. [2021-11-09 09:10:17,242 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 609 transitions. Word has length 27 [2021-11-09 09:10:17,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:17,242 INFO L470 AbstractCegarLoop]: Abstraction has 452 states and 609 transitions. [2021-11-09 09:10:17,242 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:17,243 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 609 transitions. [2021-11-09 09:10:17,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-09 09:10:17,244 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:17,244 INFO L513 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:17,260 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2021-11-09 09:10:17,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:17,449 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:17,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:17,449 INFO L85 PathProgramCache]: Analyzing trace with hash -119338265, now seen corresponding path program 16 times [2021-11-09 09:10:17,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:17,449 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1497937080] [2021-11-09 09:10:17,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:17,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:17,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:17,822 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:17,822 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:17,822 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1497937080] [2021-11-09 09:10:17,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1497937080] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:17,822 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1544588550] [2021-11-09 09:10:17,822 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-09 09:10:17,823 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:17,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:17,824 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:17,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-09 09:10:18,201 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-09 09:10:18,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:10:18,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-09 09:10:18,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:18,395 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:18,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1544588550] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:18,395 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:18,395 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2021-11-09 09:10:18,395 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212609912] [2021-11-09 09:10:18,396 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-09 09:10:18,396 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:18,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-09 09:10:18,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2021-11-09 09:10:18,399 INFO L87 Difference]: Start difference. First operand 452 states and 609 transitions. Second operand has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 21 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:19,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:19,190 INFO L93 Difference]: Finished difference Result 653 states and 967 transitions. [2021-11-09 09:10:19,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-09 09:10:19,190 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 21 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-09 09:10:19,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:19,193 INFO L225 Difference]: With dead ends: 653 [2021-11-09 09:10:19,193 INFO L226 Difference]: Without dead ends: 621 [2021-11-09 09:10:19,195 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=417, Unknown=0, NotChecked=0, Total=462 [2021-11-09 09:10:19,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 621 states. [2021-11-09 09:10:19,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 621 to 478. [2021-11-09 09:10:19,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 477 states have (on average 1.3542976939203355) internal successors, (646), 477 states have internal predecessors, (646), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:19,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 646 transitions. [2021-11-09 09:10:19,226 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 646 transitions. Word has length 28 [2021-11-09 09:10:19,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:19,227 INFO L470 AbstractCegarLoop]: Abstraction has 478 states and 646 transitions. [2021-11-09 09:10:19,227 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 21 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:19,227 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 646 transitions. [2021-11-09 09:10:19,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-09 09:10:19,228 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:19,229 INFO L513 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:19,263 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2021-11-09 09:10:19,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-09 09:10:19,449 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:19,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:19,449 INFO L85 PathProgramCache]: Analyzing trace with hash -1246005364, now seen corresponding path program 17 times [2021-11-09 09:10:19,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:19,449 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [569575043] [2021-11-09 09:10:19,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:19,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:19,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:19,722 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:19,722 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:19,722 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [569575043] [2021-11-09 09:10:19,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [569575043] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:19,723 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [993788585] [2021-11-09 09:10:19,723 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-09 09:10:19,723 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:19,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:19,725 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:19,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-09 09:10:22,472 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-09 09:10:22,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:10:22,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-09 09:10:22,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:22,635 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:22,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [993788585] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:22,635 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:22,635 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2021-11-09 09:10:22,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411625457] [2021-11-09 09:10:22,636 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-09 09:10:22,636 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:22,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-09 09:10:22,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2021-11-09 09:10:22,637 INFO L87 Difference]: Start difference. First operand 478 states and 646 transitions. Second operand has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:23,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:23,434 INFO L93 Difference]: Finished difference Result 687 states and 1020 transitions. [2021-11-09 09:10:23,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-09 09:10:23,435 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-09 09:10:23,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:23,439 INFO L225 Difference]: With dead ends: 687 [2021-11-09 09:10:23,439 INFO L226 Difference]: Without dead ends: 655 [2021-11-09 09:10:23,440 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=47, Invalid=459, Unknown=0, NotChecked=0, Total=506 [2021-11-09 09:10:23,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 655 states. [2021-11-09 09:10:23,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 655 to 504. [2021-11-09 09:10:23,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 1.3578528827037772) internal successors, (683), 503 states have internal predecessors, (683), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:23,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 683 transitions. [2021-11-09 09:10:23,462 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 683 transitions. Word has length 29 [2021-11-09 09:10:23,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:23,462 INFO L470 AbstractCegarLoop]: Abstraction has 504 states and 683 transitions. [2021-11-09 09:10:23,462 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:23,463 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 683 transitions. [2021-11-09 09:10:23,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-09 09:10:23,464 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:23,464 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:23,472 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-09 09:10:23,668 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-09 09:10:23,668 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:23,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:23,669 INFO L85 PathProgramCache]: Analyzing trace with hash -1004492410, now seen corresponding path program 7 times [2021-11-09 09:10:23,669 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:23,669 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008833488] [2021-11-09 09:10:23,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:23,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:23,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:24,204 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-09 09:10:24,204 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:24,204 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008833488] [2021-11-09 09:10:24,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1008833488] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:24,204 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1370762840] [2021-11-09 09:10:24,204 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-09 09:10:24,205 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:24,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:24,206 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:24,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-09 09:10:24,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:24,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-09 09:10:24,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:25,904 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-09 09:10:25,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1370762840] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:25,904 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:25,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 20 [2021-11-09 09:10:25,905 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330100320] [2021-11-09 09:10:25,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-09 09:10:25,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:25,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-09 09:10:25,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=332, Unknown=0, NotChecked=0, Total=380 [2021-11-09 09:10:25,906 INFO L87 Difference]: Start difference. First operand 504 states and 683 transitions. Second operand has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:31,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:31,580 INFO L93 Difference]: Finished difference Result 648 states and 827 transitions. [2021-11-09 09:10:31,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-09 09:10:31,581 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-09 09:10:31,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:31,584 INFO L225 Difference]: With dead ends: 648 [2021-11-09 09:10:31,584 INFO L226 Difference]: Without dead ends: 636 [2021-11-09 09:10:31,585 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=86, Invalid=564, Unknown=0, NotChecked=0, Total=650 [2021-11-09 09:10:31,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 636 states. [2021-11-09 09:10:31,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 636 to 512. [2021-11-09 09:10:31,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 512 states, 511 states have (on average 1.356164383561644) internal successors, (693), 511 states have internal predecessors, (693), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:31,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 693 transitions. [2021-11-09 09:10:31,614 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 693 transitions. Word has length 30 [2021-11-09 09:10:31,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:31,614 INFO L470 AbstractCegarLoop]: Abstraction has 512 states and 693 transitions. [2021-11-09 09:10:31,614 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:31,614 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 693 transitions. [2021-11-09 09:10:31,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-09 09:10:31,616 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:31,616 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:31,646 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-09 09:10:31,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:31,838 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:31,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:31,839 INFO L85 PathProgramCache]: Analyzing trace with hash 1974452903, now seen corresponding path program 4 times [2021-11-09 09:10:31,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:31,839 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352585260] [2021-11-09 09:10:31,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:31,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:31,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:31,972 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-09 09:10:31,972 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:31,972 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352585260] [2021-11-09 09:10:31,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1352585260] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:31,972 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1405132352] [2021-11-09 09:10:31,973 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-09 09:10:31,973 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:31,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:31,974 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:32,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-09 09:10:32,431 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-09 09:10:32,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:10:32,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-09 09:10:32,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:32,565 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-09 09:10:32,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1405132352] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:32,566 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:32,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2021-11-09 09:10:32,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146883570] [2021-11-09 09:10:32,567 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-09 09:10:32,567 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:32,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-09 09:10:32,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2021-11-09 09:10:32,568 INFO L87 Difference]: Start difference. First operand 512 states and 693 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:32,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:32,945 INFO L93 Difference]: Finished difference Result 589 states and 783 transitions. [2021-11-09 09:10:32,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-09 09:10:32,946 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-09 09:10:32,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:32,948 INFO L225 Difference]: With dead ends: 589 [2021-11-09 09:10:32,949 INFO L226 Difference]: Without dead ends: 571 [2021-11-09 09:10:32,949 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2021-11-09 09:10:32,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 571 states. [2021-11-09 09:10:32,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 571 to 512. [2021-11-09 09:10:32,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 512 states, 511 states have (on average 1.3542074363992171) internal successors, (692), 511 states have internal predecessors, (692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:32,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 692 transitions. [2021-11-09 09:10:32,972 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 692 transitions. Word has length 30 [2021-11-09 09:10:32,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:32,972 INFO L470 AbstractCegarLoop]: Abstraction has 512 states and 692 transitions. [2021-11-09 09:10:32,972 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:32,972 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 692 transitions. [2021-11-09 09:10:32,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-09 09:10:32,973 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:32,974 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:33,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-09 09:10:33,196 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:33,196 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:33,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:33,196 INFO L85 PathProgramCache]: Analyzing trace with hash 1893940903, now seen corresponding path program 6 times [2021-11-09 09:10:33,196 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:33,196 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1103462461] [2021-11-09 09:10:33,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:33,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:33,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:33,451 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:33,451 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:33,451 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1103462461] [2021-11-09 09:10:33,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1103462461] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:33,451 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567740138] [2021-11-09 09:10:33,451 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-09 09:10:33,452 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:33,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:33,453 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:33,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-09 09:10:33,961 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-11-09 09:10:33,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:10:33,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-09 09:10:33,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:34,272 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-09 09:10:34,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [567740138] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:34,273 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:34,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 12] total 27 [2021-11-09 09:10:34,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289592136] [2021-11-09 09:10:34,274 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-09 09:10:34,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:34,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-09 09:10:34,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2021-11-09 09:10:34,275 INFO L87 Difference]: Start difference. First operand 512 states and 692 transitions. Second operand has 27 states, 27 states have (on average 1.962962962962963) internal successors, (53), 27 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:39,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:39,522 INFO L93 Difference]: Finished difference Result 1064 states and 1421 transitions. [2021-11-09 09:10:39,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 157 states. [2021-11-09 09:10:39,522 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.962962962962963) internal successors, (53), 27 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-09 09:10:39,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:39,527 INFO L225 Difference]: With dead ends: 1064 [2021-11-09 09:10:39,527 INFO L226 Difference]: Without dead ends: 958 [2021-11-09 09:10:39,530 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10847 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=844, Invalid=29258, Unknown=0, NotChecked=0, Total=30102 [2021-11-09 09:10:39,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 958 states. [2021-11-09 09:10:39,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 958 to 556. [2021-11-09 09:10:39,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 556 states, 555 states have (on average 1.3513513513513513) internal successors, (750), 555 states have internal predecessors, (750), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:39,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 556 states to 556 states and 750 transitions. [2021-11-09 09:10:39,557 INFO L78 Accepts]: Start accepts. Automaton has 556 states and 750 transitions. Word has length 30 [2021-11-09 09:10:39,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:39,557 INFO L470 AbstractCegarLoop]: Abstraction has 556 states and 750 transitions. [2021-11-09 09:10:39,557 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.962962962962963) internal successors, (53), 27 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:39,557 INFO L276 IsEmpty]: Start isEmpty. Operand 556 states and 750 transitions. [2021-11-09 09:10:39,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-09 09:10:39,559 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:39,559 INFO L513 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:39,597 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-09 09:10:39,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-09 09:10:39,772 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:39,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:39,772 INFO L85 PathProgramCache]: Analyzing trace with hash -1812947065, now seen corresponding path program 18 times [2021-11-09 09:10:39,772 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:39,773 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [171015760] [2021-11-09 09:10:39,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:39,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:39,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:40,078 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:40,078 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:40,079 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [171015760] [2021-11-09 09:10:40,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [171015760] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:40,079 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [67241950] [2021-11-09 09:10:40,079 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-09 09:10:40,079 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:40,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:40,080 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:40,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-09 09:10:40,908 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-11-09 09:10:40,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:10:40,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-09 09:10:40,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:41,058 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:41,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [67241950] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:41,058 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:41,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2021-11-09 09:10:41,059 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684466709] [2021-11-09 09:10:41,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-09 09:10:41,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:41,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-09 09:10:41,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2021-11-09 09:10:41,060 INFO L87 Difference]: Start difference. First operand 556 states and 750 transitions. Second operand has 23 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:41,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:41,903 INFO L93 Difference]: Finished difference Result 783 states and 1154 transitions. [2021-11-09 09:10:41,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-09 09:10:41,903 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-09 09:10:41,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:41,906 INFO L225 Difference]: With dead ends: 783 [2021-11-09 09:10:41,906 INFO L226 Difference]: Without dead ends: 751 [2021-11-09 09:10:41,906 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=503, Unknown=0, NotChecked=0, Total=552 [2021-11-09 09:10:41,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 751 states. [2021-11-09 09:10:41,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 751 to 584. [2021-11-09 09:10:41,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 584 states, 583 states have (on average 1.3550600343053174) internal successors, (790), 583 states have internal predecessors, (790), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:41,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 584 states to 584 states and 790 transitions. [2021-11-09 09:10:41,944 INFO L78 Accepts]: Start accepts. Automaton has 584 states and 790 transitions. Word has length 30 [2021-11-09 09:10:41,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:41,945 INFO L470 AbstractCegarLoop]: Abstraction has 584 states and 790 transitions. [2021-11-09 09:10:41,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:41,945 INFO L276 IsEmpty]: Start isEmpty. Operand 584 states and 790 transitions. [2021-11-09 09:10:41,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-09 09:10:41,946 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:41,946 INFO L513 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:41,955 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-09 09:10:42,152 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-09 09:10:42,152 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:42,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:42,152 INFO L85 PathProgramCache]: Analyzing trace with hash 2086696684, now seen corresponding path program 19 times [2021-11-09 09:10:42,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:42,152 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161074741] [2021-11-09 09:10:42,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:42,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:42,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:42,521 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:42,521 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:42,521 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161074741] [2021-11-09 09:10:42,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [161074741] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:42,521 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2144817032] [2021-11-09 09:10:42,521 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-09 09:10:42,521 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:42,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:42,524 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:42,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-09 09:10:42,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:42,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-09 09:10:42,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:43,121 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:43,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2144817032] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:43,122 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:43,122 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2021-11-09 09:10:43,122 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964780454] [2021-11-09 09:10:43,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-09 09:10:43,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:43,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-09 09:10:43,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2021-11-09 09:10:43,123 INFO L87 Difference]: Start difference. First operand 584 states and 790 transitions. Second operand has 24 states, 24 states have (on average 1.375) internal successors, (33), 24 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:44,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:44,100 INFO L93 Difference]: Finished difference Result 819 states and 1210 transitions. [2021-11-09 09:10:44,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-09 09:10:44,101 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.375) internal successors, (33), 24 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-09 09:10:44,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:44,104 INFO L225 Difference]: With dead ends: 819 [2021-11-09 09:10:44,104 INFO L226 Difference]: Without dead ends: 787 [2021-11-09 09:10:44,104 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=549, Unknown=0, NotChecked=0, Total=600 [2021-11-09 09:10:44,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 787 states. [2021-11-09 09:10:44,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 787 to 612. [2021-11-09 09:10:44,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 612 states, 611 states have (on average 1.358428805237316) internal successors, (830), 611 states have internal predecessors, (830), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:44,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 612 states to 612 states and 830 transitions. [2021-11-09 09:10:44,129 INFO L78 Accepts]: Start accepts. Automaton has 612 states and 830 transitions. Word has length 31 [2021-11-09 09:10:44,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:44,129 INFO L470 AbstractCegarLoop]: Abstraction has 612 states and 830 transitions. [2021-11-09 09:10:44,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.375) internal successors, (33), 24 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:44,130 INFO L276 IsEmpty]: Start isEmpty. Operand 612 states and 830 transitions. [2021-11-09 09:10:44,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-09 09:10:44,131 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:44,131 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:44,165 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-09 09:10:44,348 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-09 09:10:44,348 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:44,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:44,349 INFO L85 PathProgramCache]: Analyzing trace with hash 1240928360, now seen corresponding path program 8 times [2021-11-09 09:10:44,349 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:44,349 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1430703350] [2021-11-09 09:10:44,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:44,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:44,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:44,431 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-09 09:10:44,431 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:44,431 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1430703350] [2021-11-09 09:10:44,431 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1430703350] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:44,432 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [238481275] [2021-11-09 09:10:44,432 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 09:10:44,432 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:44,432 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:44,439 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:44,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-09 09:10:44,966 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 09:10:44,966 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:10:44,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-09 09:10:44,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:45,060 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-09 09:10:45,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [238481275] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:45,061 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:45,061 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-11-09 09:10:45,061 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565256315] [2021-11-09 09:10:45,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-09 09:10:45,061 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:45,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-09 09:10:45,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-09 09:10:45,063 INFO L87 Difference]: Start difference. First operand 612 states and 830 transitions. Second operand has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:45,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:45,145 INFO L93 Difference]: Finished difference Result 1079 states and 1417 transitions. [2021-11-09 09:10:45,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-09 09:10:45,147 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-09 09:10:45,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:45,151 INFO L225 Difference]: With dead ends: 1079 [2021-11-09 09:10:45,151 INFO L226 Difference]: Without dead ends: 918 [2021-11-09 09:10:45,152 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-09 09:10:45,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 918 states. [2021-11-09 09:10:45,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 918 to 575. [2021-11-09 09:10:45,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.3449477351916377) internal successors, (772), 574 states have internal predecessors, (772), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:45,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 772 transitions. [2021-11-09 09:10:45,180 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 772 transitions. Word has length 32 [2021-11-09 09:10:45,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:45,181 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 772 transitions. [2021-11-09 09:10:45,181 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:45,181 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 772 transitions. [2021-11-09 09:10:45,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-09 09:10:45,182 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:45,182 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:45,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-09 09:10:45,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-09 09:10:45,397 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:45,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:45,398 INFO L85 PathProgramCache]: Analyzing trace with hash 380203431, now seen corresponding path program 9 times [2021-11-09 09:10:45,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:45,398 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181625714] [2021-11-09 09:10:45,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:45,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:45,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:45,505 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-09 09:10:45,505 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:45,505 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1181625714] [2021-11-09 09:10:45,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1181625714] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:45,505 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338418487] [2021-11-09 09:10:45,505 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-09 09:10:45,506 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:45,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:45,508 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:45,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-09 09:10:46,115 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-09 09:10:46,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:10:46,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-09 09:10:46,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:46,247 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-09 09:10:46,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338418487] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:46,247 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:46,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2021-11-09 09:10:46,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207627216] [2021-11-09 09:10:46,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-09 09:10:46,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:46,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-09 09:10:46,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2021-11-09 09:10:46,248 INFO L87 Difference]: Start difference. First operand 575 states and 772 transitions. Second operand has 13 states, 13 states have (on average 2.769230769230769) internal successors, (36), 13 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:46,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:46,665 INFO L93 Difference]: Finished difference Result 1456 states and 1981 transitions. [2021-11-09 09:10:46,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-09 09:10:46,665 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.769230769230769) internal successors, (36), 13 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-09 09:10:46,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:46,670 INFO L225 Difference]: With dead ends: 1456 [2021-11-09 09:10:46,670 INFO L226 Difference]: Without dead ends: 1280 [2021-11-09 09:10:46,670 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=148, Invalid=314, Unknown=0, NotChecked=0, Total=462 [2021-11-09 09:10:46,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1280 states. [2021-11-09 09:10:46,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1280 to 655. [2021-11-09 09:10:46,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 655 states, 654 states have (on average 1.3654434250764527) internal successors, (893), 654 states have internal predecessors, (893), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:46,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 655 states to 655 states and 893 transitions. [2021-11-09 09:10:46,703 INFO L78 Accepts]: Start accepts. Automaton has 655 states and 893 transitions. Word has length 32 [2021-11-09 09:10:46,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:46,703 INFO L470 AbstractCegarLoop]: Abstraction has 655 states and 893 transitions. [2021-11-09 09:10:46,703 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.769230769230769) internal successors, (36), 13 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:46,703 INFO L276 IsEmpty]: Start isEmpty. Operand 655 states and 893 transitions. [2021-11-09 09:10:46,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-09 09:10:46,705 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:46,705 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:46,737 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2021-11-09 09:10:46,924 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-09 09:10:46,924 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:46,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:46,924 INFO L85 PathProgramCache]: Analyzing trace with hash -404867559, now seen corresponding path program 5 times [2021-11-09 09:10:46,925 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:46,925 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904612603] [2021-11-09 09:10:46,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:46,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:46,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:47,076 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-09 09:10:47,076 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:47,076 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904612603] [2021-11-09 09:10:47,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1904612603] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:47,076 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [835348791] [2021-11-09 09:10:47,076 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-09 09:10:47,077 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:47,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:47,080 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:47,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-09 09:10:47,731 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-09 09:10:47,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:10:47,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-09 09:10:47,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:47,986 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-09 09:10:47,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [835348791] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:47,986 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:47,986 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 18] total 19 [2021-11-09 09:10:47,986 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824661571] [2021-11-09 09:10:47,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-09 09:10:47,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:47,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-09 09:10:47,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=299, Unknown=0, NotChecked=0, Total=342 [2021-11-09 09:10:47,987 INFO L87 Difference]: Start difference. First operand 655 states and 893 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:48,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:48,364 INFO L93 Difference]: Finished difference Result 765 states and 1021 transitions. [2021-11-09 09:10:48,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-09 09:10:48,365 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-09 09:10:48,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:48,367 INFO L225 Difference]: With dead ends: 765 [2021-11-09 09:10:48,368 INFO L226 Difference]: Without dead ends: 746 [2021-11-09 09:10:48,368 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=73, Invalid=527, Unknown=0, NotChecked=0, Total=600 [2021-11-09 09:10:48,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 746 states. [2021-11-09 09:10:48,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 746 to 655. [2021-11-09 09:10:48,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 655 states, 654 states have (on average 1.363914373088685) internal successors, (892), 654 states have internal predecessors, (892), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:48,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 655 states to 655 states and 892 transitions. [2021-11-09 09:10:48,395 INFO L78 Accepts]: Start accepts. Automaton has 655 states and 892 transitions. Word has length 32 [2021-11-09 09:10:48,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:48,395 INFO L470 AbstractCegarLoop]: Abstraction has 655 states and 892 transitions. [2021-11-09 09:10:48,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:48,396 INFO L276 IsEmpty]: Start isEmpty. Operand 655 states and 892 transitions. [2021-11-09 09:10:48,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-09 09:10:48,397 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:48,397 INFO L513 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:48,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-09 09:10:48,604 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:48,604 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:48,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:48,605 INFO L85 PathProgramCache]: Analyzing trace with hash -1578398681, now seen corresponding path program 20 times [2021-11-09 09:10:48,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:48,605 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785081264] [2021-11-09 09:10:48,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:48,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:48,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:49,019 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:49,019 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:49,019 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [785081264] [2021-11-09 09:10:49,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [785081264] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:49,020 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1360912997] [2021-11-09 09:10:49,020 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 09:10:49,020 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:49,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:49,020 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:49,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-09 09:10:49,464 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 09:10:49,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:10:49,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-09 09:10:49,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:49,652 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:49,652 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1360912997] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:49,652 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:49,652 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2021-11-09 09:10:49,652 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023964414] [2021-11-09 09:10:49,653 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-09 09:10:49,653 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:49,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-09 09:10:49,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2021-11-09 09:10:49,653 INFO L87 Difference]: Start difference. First operand 655 states and 892 transitions. Second operand has 25 states, 25 states have (on average 1.36) internal successors, (34), 25 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:50,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:50,907 INFO L93 Difference]: Finished difference Result 949 states and 1428 transitions. [2021-11-09 09:10:50,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-09 09:10:50,908 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.36) internal successors, (34), 25 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-09 09:10:50,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:50,912 INFO L225 Difference]: With dead ends: 949 [2021-11-09 09:10:50,913 INFO L226 Difference]: Without dead ends: 911 [2021-11-09 09:10:50,913 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=597, Unknown=0, NotChecked=0, Total=650 [2021-11-09 09:10:50,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 911 states. [2021-11-09 09:10:50,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 911 to 687. [2021-11-09 09:10:50,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 687 states, 686 states have (on average 1.3673469387755102) internal successors, (938), 686 states have internal predecessors, (938), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:50,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 687 states to 687 states and 938 transitions. [2021-11-09 09:10:50,941 INFO L78 Accepts]: Start accepts. Automaton has 687 states and 938 transitions. Word has length 32 [2021-11-09 09:10:50,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:50,941 INFO L470 AbstractCegarLoop]: Abstraction has 687 states and 938 transitions. [2021-11-09 09:10:50,941 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.36) internal successors, (34), 25 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:50,941 INFO L276 IsEmpty]: Start isEmpty. Operand 687 states and 938 transitions. [2021-11-09 09:10:50,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-09 09:10:50,943 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:50,943 INFO L513 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:50,978 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2021-11-09 09:10:51,160 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:51,160 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:51,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:51,160 INFO L85 PathProgramCache]: Analyzing trace with hash 767761996, now seen corresponding path program 21 times [2021-11-09 09:10:51,160 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:51,161 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [587756841] [2021-11-09 09:10:51,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:51,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:51,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:51,574 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:51,574 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:51,574 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [587756841] [2021-11-09 09:10:51,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [587756841] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:51,575 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [367169810] [2021-11-09 09:10:51,575 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-09 09:10:51,575 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:51,575 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:51,576 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:51,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-09 09:10:52,451 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-09 09:10:52,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:10:52,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-09 09:10:52,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:52,751 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:10:52,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [367169810] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:52,752 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:52,752 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26] total 28 [2021-11-09 09:10:52,752 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66258624] [2021-11-09 09:10:52,752 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-09 09:10:52,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:52,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-09 09:10:52,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=700, Unknown=0, NotChecked=0, Total=756 [2021-11-09 09:10:52,753 INFO L87 Difference]: Start difference. First operand 687 states and 938 transitions. Second operand has 28 states, 28 states have (on average 1.3571428571428572) internal successors, (38), 28 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:54,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:54,432 INFO L93 Difference]: Finished difference Result 999 states and 1507 transitions. [2021-11-09 09:10:54,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-09 09:10:54,432 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.3571428571428572) internal successors, (38), 28 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-09 09:10:54,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:54,437 INFO L225 Difference]: With dead ends: 999 [2021-11-09 09:10:54,437 INFO L226 Difference]: Without dead ends: 961 [2021-11-09 09:10:54,437 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=62, Invalid=750, Unknown=0, NotChecked=0, Total=812 [2021-11-09 09:10:54,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 961 states. [2021-11-09 09:10:54,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 961 to 719. [2021-11-09 09:10:54,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 719 states, 718 states have (on average 1.3704735376044568) internal successors, (984), 718 states have internal predecessors, (984), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:54,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 719 states to 719 states and 984 transitions. [2021-11-09 09:10:54,462 INFO L78 Accepts]: Start accepts. Automaton has 719 states and 984 transitions. Word has length 33 [2021-11-09 09:10:54,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:54,463 INFO L470 AbstractCegarLoop]: Abstraction has 719 states and 984 transitions. [2021-11-09 09:10:54,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.3571428571428572) internal successors, (38), 28 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:54,463 INFO L276 IsEmpty]: Start isEmpty. Operand 719 states and 984 transitions. [2021-11-09 09:10:54,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-09 09:10:54,465 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:54,465 INFO L513 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:54,487 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-09 09:10:54,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:54,672 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:54,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:54,672 INFO L85 PathProgramCache]: Analyzing trace with hash -1111633127, now seen corresponding path program 7 times [2021-11-09 09:10:54,672 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:54,672 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1010081413] [2021-11-09 09:10:54,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:54,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:54,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:54,933 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-09 09:10:54,934 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:54,934 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1010081413] [2021-11-09 09:10:54,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1010081413] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:54,934 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2103609305] [2021-11-09 09:10:54,934 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-09 09:10:54,934 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:54,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:54,935 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:54,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-09 09:10:55,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:55,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-09 09:10:55,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:55,787 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-09 09:10:55,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2103609305] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:55,787 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:55,788 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 26 [2021-11-09 09:10:55,788 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391397444] [2021-11-09 09:10:55,788 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-09 09:10:55,788 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:55,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-09 09:10:55,789 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=585, Unknown=0, NotChecked=0, Total=650 [2021-11-09 09:10:55,789 INFO L87 Difference]: Start difference. First operand 719 states and 984 transitions. Second operand has 26 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:58,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:58,075 INFO L93 Difference]: Finished difference Result 1248 states and 1737 transitions. [2021-11-09 09:10:58,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-09 09:10:58,075 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-09 09:10:58,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:58,079 INFO L225 Difference]: With dead ends: 1248 [2021-11-09 09:10:58,079 INFO L226 Difference]: Without dead ends: 1109 [2021-11-09 09:10:58,080 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1653 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=265, Invalid=5435, Unknown=0, NotChecked=0, Total=5700 [2021-11-09 09:10:58,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1109 states. [2021-11-09 09:10:58,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1109 to 767. [2021-11-09 09:10:58,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 767 states, 766 states have (on average 1.3629242819843341) internal successors, (1044), 766 states have internal predecessors, (1044), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:58,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 767 states to 767 states and 1044 transitions. [2021-11-09 09:10:58,107 INFO L78 Accepts]: Start accepts. Automaton has 767 states and 1044 transitions. Word has length 34 [2021-11-09 09:10:58,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:58,108 INFO L470 AbstractCegarLoop]: Abstraction has 767 states and 1044 transitions. [2021-11-09 09:10:58,108 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:58,108 INFO L276 IsEmpty]: Start isEmpty. Operand 767 states and 1044 transitions. [2021-11-09 09:10:58,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-09 09:10:58,109 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:58,109 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:58,132 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2021-11-09 09:10:58,316 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:58,316 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:58,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:58,316 INFO L85 PathProgramCache]: Analyzing trace with hash -2062692825, now seen corresponding path program 6 times [2021-11-09 09:10:58,316 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:58,316 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734991889] [2021-11-09 09:10:58,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:58,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:58,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:10:58,489 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-09 09:10:58,489 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:10:58,489 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734991889] [2021-11-09 09:10:58,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [734991889] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:58,489 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2072960000] [2021-11-09 09:10:58,489 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-09 09:10:58,489 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:10:58,490 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:10:58,491 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:10:58,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-09 09:10:59,162 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-09 09:10:59,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:10:59,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-09 09:10:59,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:10:59,332 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-09 09:10:59,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2072960000] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:10:59,332 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:10:59,332 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-11-09 09:10:59,332 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023414826] [2021-11-09 09:10:59,332 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-09 09:10:59,333 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:10:59,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-09 09:10:59,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-09 09:10:59,333 INFO L87 Difference]: Start difference. First operand 767 states and 1044 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:59,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:10:59,709 INFO L93 Difference]: Finished difference Result 887 states and 1184 transitions. [2021-11-09 09:10:59,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-09 09:10:59,710 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-09 09:10:59,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:10:59,713 INFO L225 Difference]: With dead ends: 887 [2021-11-09 09:10:59,713 INFO L226 Difference]: Without dead ends: 867 [2021-11-09 09:10:59,714 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2021-11-09 09:10:59,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 867 states. [2021-11-09 09:10:59,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 867 to 767. [2021-11-09 09:10:59,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 767 states, 766 states have (on average 1.3616187989556137) internal successors, (1043), 766 states have internal predecessors, (1043), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:59,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 767 states to 767 states and 1043 transitions. [2021-11-09 09:10:59,734 INFO L78 Accepts]: Start accepts. Automaton has 767 states and 1043 transitions. Word has length 34 [2021-11-09 09:10:59,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:10:59,734 INFO L470 AbstractCegarLoop]: Abstraction has 767 states and 1043 transitions. [2021-11-09 09:10:59,734 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:10:59,734 INFO L276 IsEmpty]: Start isEmpty. Operand 767 states and 1043 transitions. [2021-11-09 09:10:59,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-09 09:10:59,735 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:10:59,735 INFO L513 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:10:59,751 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-09 09:10:59,941 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-11-09 09:10:59,941 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:10:59,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:10:59,942 INFO L85 PathProgramCache]: Analyzing trace with hash 484298951, now seen corresponding path program 22 times [2021-11-09 09:10:59,942 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:10:59,942 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530523618] [2021-11-09 09:10:59,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:10:59,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:10:59,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:11:00,410 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:11:00,410 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:11:00,410 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530523618] [2021-11-09 09:11:00,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530523618] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:11:00,411 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804657156] [2021-11-09 09:11:00,411 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-09 09:11:00,411 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:11:00,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:11:00,414 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:11:00,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-09 09:11:01,039 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-09 09:11:01,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:11:01,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-09 09:11:01,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:11:01,244 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:11:01,244 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804657156] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:11:01,244 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:11:01,244 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 27 [2021-11-09 09:11:01,245 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540302804] [2021-11-09 09:11:01,245 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-09 09:11:01,245 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:11:01,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-09 09:11:01,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=650, Unknown=0, NotChecked=0, Total=702 [2021-11-09 09:11:01,246 INFO L87 Difference]: Start difference. First operand 767 states and 1043 transitions. Second operand has 27 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 27 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:11:02,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:11:02,656 INFO L93 Difference]: Finished difference Result 1083 states and 1622 transitions. [2021-11-09 09:11:02,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-09 09:11:02,657 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 27 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-09 09:11:02,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:11:02,662 INFO L225 Difference]: With dead ends: 1083 [2021-11-09 09:11:02,662 INFO L226 Difference]: Without dead ends: 1045 [2021-11-09 09:11:02,662 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=699, Unknown=0, NotChecked=0, Total=756 [2021-11-09 09:11:02,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1045 states. [2021-11-09 09:11:02,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1045 to 801. [2021-11-09 09:11:02,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 801 states, 800 states have (on average 1.365) internal successors, (1092), 800 states have internal predecessors, (1092), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:11:02,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 801 states to 801 states and 1092 transitions. [2021-11-09 09:11:02,690 INFO L78 Accepts]: Start accepts. Automaton has 801 states and 1092 transitions. Word has length 34 [2021-11-09 09:11:02,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:11:02,690 INFO L470 AbstractCegarLoop]: Abstraction has 801 states and 1092 transitions. [2021-11-09 09:11:02,691 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 27 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:11:02,691 INFO L276 IsEmpty]: Start isEmpty. Operand 801 states and 1092 transitions. [2021-11-09 09:11:02,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-09 09:11:02,692 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:11:02,692 INFO L513 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:11:02,718 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-09 09:11:02,892 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-09 09:11:02,893 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:11:02,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:11:02,893 INFO L85 PathProgramCache]: Analyzing trace with hash 286879148, now seen corresponding path program 23 times [2021-11-09 09:11:02,893 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:11:02,894 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [133383959] [2021-11-09 09:11:02,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:11:02,894 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:11:02,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:11:03,372 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:11:03,372 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:11:03,372 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [133383959] [2021-11-09 09:11:03,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [133383959] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:11:03,372 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2084169399] [2021-11-09 09:11:03,372 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-09 09:11:03,373 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:11:03,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:11:03,373 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:11:03,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-09 09:11:08,115 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-11-09 09:11:08,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:11:08,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-09 09:11:08,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:11:08,357 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:11:08,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2084169399] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:11:08,358 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:11:08,358 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2021-11-09 09:11:08,358 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409418710] [2021-11-09 09:11:08,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-09 09:11:08,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:11:08,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-09 09:11:08,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=702, Unknown=0, NotChecked=0, Total=756 [2021-11-09 09:11:08,359 INFO L87 Difference]: Start difference. First operand 801 states and 1092 transitions. Second operand has 28 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 28 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:11:09,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:11:09,623 INFO L93 Difference]: Finished difference Result 1127 states and 1691 transitions. [2021-11-09 09:11:09,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-09 09:11:09,623 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 28 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-09 09:11:09,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:11:09,627 INFO L225 Difference]: With dead ends: 1127 [2021-11-09 09:11:09,627 INFO L226 Difference]: Without dead ends: 1089 [2021-11-09 09:11:09,628 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=59, Invalid=753, Unknown=0, NotChecked=0, Total=812 [2021-11-09 09:11:09,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1089 states. [2021-11-09 09:11:09,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1089 to 835. [2021-11-09 09:11:09,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 835 states, 834 states have (on average 1.36810551558753) internal successors, (1141), 834 states have internal predecessors, (1141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:11:09,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 835 states to 835 states and 1141 transitions. [2021-11-09 09:11:09,650 INFO L78 Accepts]: Start accepts. Automaton has 835 states and 1141 transitions. Word has length 35 [2021-11-09 09:11:09,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:11:09,650 INFO L470 AbstractCegarLoop]: Abstraction has 835 states and 1141 transitions. [2021-11-09 09:11:09,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 28 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:11:09,650 INFO L276 IsEmpty]: Start isEmpty. Operand 835 states and 1141 transitions. [2021-11-09 09:11:09,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-09 09:11:09,651 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:11:09,651 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:11:09,656 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-09 09:11:09,851 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-09 09:11:09,852 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:11:09,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:11:09,852 INFO L85 PathProgramCache]: Analyzing trace with hash 1563221799, now seen corresponding path program 10 times [2021-11-09 09:11:09,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:11:09,853 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855446107] [2021-11-09 09:11:09,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:11:09,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:11:09,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:11:10,478 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-09 09:11:10,479 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:11:10,479 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1855446107] [2021-11-09 09:11:10,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1855446107] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:11:10,479 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1174984880] [2021-11-09 09:11:10,479 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-09 09:11:10,479 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:11:10,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:11:10,480 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:11:10,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-09 09:11:11,206 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-09 09:11:11,206 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:11:11,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-09 09:11:11,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:11:11,898 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-09 09:11:11,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1174984880] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:11:11,898 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:11:11,898 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 19 [2021-11-09 09:11:11,898 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128930392] [2021-11-09 09:11:11,898 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-09 09:11:11,899 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:11:11,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-09 09:11:11,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=302, Unknown=0, NotChecked=0, Total=342 [2021-11-09 09:11:11,899 INFO L87 Difference]: Start difference. First operand 835 states and 1141 transitions. Second operand has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 19 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:11:15,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:11:15,716 INFO L93 Difference]: Finished difference Result 849 states and 1154 transitions. [2021-11-09 09:11:15,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-09 09:11:15,716 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 19 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-09 09:11:15,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:11:15,719 INFO L225 Difference]: With dead ends: 849 [2021-11-09 09:11:15,719 INFO L226 Difference]: Without dead ends: 819 [2021-11-09 09:11:15,720 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=85, Invalid=617, Unknown=0, NotChecked=0, Total=702 [2021-11-09 09:11:15,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 819 states. [2021-11-09 09:11:15,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 819 to 819. [2021-11-09 09:11:15,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 819 states, 818 states have (on average 1.374083129584352) internal successors, (1124), 818 states have internal predecessors, (1124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:11:15,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 819 states to 819 states and 1124 transitions. [2021-11-09 09:11:15,740 INFO L78 Accepts]: Start accepts. Automaton has 819 states and 1124 transitions. Word has length 36 [2021-11-09 09:11:15,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:11:15,740 INFO L470 AbstractCegarLoop]: Abstraction has 819 states and 1124 transitions. [2021-11-09 09:11:15,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 19 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:11:15,740 INFO L276 IsEmpty]: Start isEmpty. Operand 819 states and 1124 transitions. [2021-11-09 09:11:15,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-09 09:11:15,741 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:11:15,741 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:11:15,764 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2021-11-09 09:11:15,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:11:15,943 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:11:15,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:11:15,943 INFO L85 PathProgramCache]: Analyzing trace with hash 61818599, now seen corresponding path program 8 times [2021-11-09 09:11:15,943 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:11:15,943 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117780333] [2021-11-09 09:11:15,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:11:15,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:11:15,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:11:16,298 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:11:16,298 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:11:16,298 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117780333] [2021-11-09 09:11:16,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2117780333] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:11:16,298 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [170822418] [2021-11-09 09:11:16,298 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 09:11:16,298 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:11:16,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:11:16,300 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:11:16,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-09 09:11:16,966 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 09:11:16,966 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:11:16,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-09 09:11:16,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:11:17,304 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 8 proven. 64 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-09 09:11:17,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [170822418] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:11:17,304 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:11:17,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 11] total 30 [2021-11-09 09:11:17,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42533678] [2021-11-09 09:11:17,304 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-09 09:11:17,304 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:11:17,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-09 09:11:17,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=812, Unknown=0, NotChecked=0, Total=870 [2021-11-09 09:11:17,305 INFO L87 Difference]: Start difference. First operand 819 states and 1124 transitions. Second operand has 30 states, 30 states have (on average 2.0) internal successors, (60), 30 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:13,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:13:13,368 INFO L93 Difference]: Finished difference Result 3099 states and 3898 transitions. [2021-11-09 09:13:13,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 398 states. [2021-11-09 09:13:13,368 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 30 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-09 09:13:13,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:13:13,382 INFO L225 Difference]: With dead ends: 3099 [2021-11-09 09:13:13,383 INFO L226 Difference]: Without dead ends: 2959 [2021-11-09 09:13:13,391 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 457 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 421 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77076 ImplicationChecksByTransitivity, 99.6s TimeCoverageRelationStatistics Valid=7079, Invalid=171427, Unknown=0, NotChecked=0, Total=178506 [2021-11-09 09:13:13,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2959 states. [2021-11-09 09:13:13,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2959 to 846. [2021-11-09 09:13:13,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 846 states, 845 states have (on average 1.375147928994083) internal successors, (1162), 845 states have internal predecessors, (1162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:13,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 846 states to 846 states and 1162 transitions. [2021-11-09 09:13:13,440 INFO L78 Accepts]: Start accepts. Automaton has 846 states and 1162 transitions. Word has length 36 [2021-11-09 09:13:13,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:13:13,440 INFO L470 AbstractCegarLoop]: Abstraction has 846 states and 1162 transitions. [2021-11-09 09:13:13,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 30 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:13,440 INFO L276 IsEmpty]: Start isEmpty. Operand 846 states and 1162 transitions. [2021-11-09 09:13:13,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-09 09:13:13,441 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:13:13,441 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:13:13,465 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2021-11-09 09:13:13,648 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-09 09:13:13,648 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:13:13,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:13:13,649 INFO L85 PathProgramCache]: Analyzing trace with hash 837715225, now seen corresponding path program 7 times [2021-11-09 09:13:13,649 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:13:13,649 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1241526788] [2021-11-09 09:13:13,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:13:13,649 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:13:13,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:13:13,903 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-09 09:13:13,903 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:13:13,903 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1241526788] [2021-11-09 09:13:13,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1241526788] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:13,903 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [946961081] [2021-11-09 09:13:13,903 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-09 09:13:13,904 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:13:13,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:13:13,908 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:13:13,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-09 09:13:14,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:13:14,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-09 09:13:14,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:13:14,954 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-09 09:13:14,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [946961081] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:14,955 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:13:14,955 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2021-11-09 09:13:14,955 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065001589] [2021-11-09 09:13:14,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-09 09:13:14,956 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:13:14,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-09 09:13:14,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=208, Unknown=0, NotChecked=0, Total=240 [2021-11-09 09:13:14,957 INFO L87 Difference]: Start difference. First operand 846 states and 1162 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:15,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:13:15,472 INFO L93 Difference]: Finished difference Result 965 states and 1302 transitions. [2021-11-09 09:13:15,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-09 09:13:15,474 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-09 09:13:15,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:13:15,478 INFO L225 Difference]: With dead ends: 965 [2021-11-09 09:13:15,478 INFO L226 Difference]: Without dead ends: 944 [2021-11-09 09:13:15,479 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=62, Invalid=400, Unknown=0, NotChecked=0, Total=462 [2021-11-09 09:13:15,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 944 states. [2021-11-09 09:13:15,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 944 to 846. [2021-11-09 09:13:15,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 846 states, 845 states have (on average 1.3739644970414202) internal successors, (1161), 845 states have internal predecessors, (1161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:15,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 846 states to 846 states and 1161 transitions. [2021-11-09 09:13:15,527 INFO L78 Accepts]: Start accepts. Automaton has 846 states and 1161 transitions. Word has length 36 [2021-11-09 09:13:15,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:13:15,527 INFO L470 AbstractCegarLoop]: Abstraction has 846 states and 1161 transitions. [2021-11-09 09:13:15,527 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:15,527 INFO L276 IsEmpty]: Start isEmpty. Operand 846 states and 1161 transitions. [2021-11-09 09:13:15,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-09 09:13:15,528 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:13:15,528 INFO L513 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:13:15,555 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-09 09:13:15,731 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-09 09:13:15,731 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:13:15,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:13:15,731 INFO L85 PathProgramCache]: Analyzing trace with hash -1538167449, now seen corresponding path program 24 times [2021-11-09 09:13:15,732 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:13:15,732 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2051572525] [2021-11-09 09:13:15,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:13:15,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:13:15,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:13:16,253 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:13:16,253 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:13:16,253 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2051572525] [2021-11-09 09:13:16,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2051572525] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:16,254 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2000455442] [2021-11-09 09:13:16,254 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-09 09:13:16,254 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:13:16,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:13:16,255 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:13:16,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-09 09:13:17,694 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-11-09 09:13:17,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:13:17,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-09 09:13:17,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:13:17,937 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:13:17,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2000455442] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:17,938 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:13:17,938 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 28 [2021-11-09 09:13:17,938 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250260633] [2021-11-09 09:13:17,938 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-09 09:13:17,938 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:13:17,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-09 09:13:17,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2021-11-09 09:13:17,939 INFO L87 Difference]: Start difference. First operand 846 states and 1161 transitions. Second operand has 28 states, 28 states have (on average 1.5) internal successors, (42), 28 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:19,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:13:19,495 INFO L93 Difference]: Finished difference Result 1156 states and 1727 transitions. [2021-11-09 09:13:19,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-09 09:13:19,496 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.5) internal successors, (42), 28 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-09 09:13:19,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:13:19,501 INFO L225 Difference]: With dead ends: 1156 [2021-11-09 09:13:19,501 INFO L226 Difference]: Without dead ends: 1120 [2021-11-09 09:13:19,502 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2021-11-09 09:13:19,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1120 states. [2021-11-09 09:13:19,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1120 to 881. [2021-11-09 09:13:19,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 881 states, 880 states have (on average 1.3772727272727272) internal successors, (1212), 880 states have internal predecessors, (1212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:19,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 881 states to 881 states and 1212 transitions. [2021-11-09 09:13:19,535 INFO L78 Accepts]: Start accepts. Automaton has 881 states and 1212 transitions. Word has length 36 [2021-11-09 09:13:19,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:13:19,535 INFO L470 AbstractCegarLoop]: Abstraction has 881 states and 1212 transitions. [2021-11-09 09:13:19,535 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.5) internal successors, (42), 28 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:19,535 INFO L276 IsEmpty]: Start isEmpty. Operand 881 states and 1212 transitions. [2021-11-09 09:13:19,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-09 09:13:19,537 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:13:19,537 INFO L513 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:13:19,543 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-09 09:13:19,740 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:13:19,740 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:13:19,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:13:19,741 INFO L85 PathProgramCache]: Analyzing trace with hash 2014930188, now seen corresponding path program 25 times [2021-11-09 09:13:19,741 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:13:19,741 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1298215569] [2021-11-09 09:13:19,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:13:19,741 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:13:19,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:13:20,400 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:13:20,401 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:13:20,401 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1298215569] [2021-11-09 09:13:20,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1298215569] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:20,401 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1555705614] [2021-11-09 09:13:20,401 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-09 09:13:20,401 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:13:20,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:13:20,404 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:13:20,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-09 09:13:21,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:13:21,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-09 09:13:21,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:13:21,525 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:13:21,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1555705614] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:21,526 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:13:21,526 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2021-11-09 09:13:21,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925478276] [2021-11-09 09:13:21,527 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-09 09:13:21,527 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:13:21,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-09 09:13:21,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=812, Unknown=0, NotChecked=0, Total=870 [2021-11-09 09:13:21,528 INFO L87 Difference]: Start difference. First operand 881 states and 1212 transitions. Second operand has 30 states, 30 states have (on average 1.3) internal successors, (39), 30 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:23,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:13:23,377 INFO L93 Difference]: Finished difference Result 1200 states and 1796 transitions. [2021-11-09 09:13:23,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-09 09:13:23,378 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.3) internal successors, (39), 30 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-09 09:13:23,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:13:23,380 INFO L225 Difference]: With dead ends: 1200 [2021-11-09 09:13:23,380 INFO L226 Difference]: Without dead ends: 1164 [2021-11-09 09:13:23,381 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=63, Invalid=867, Unknown=0, NotChecked=0, Total=930 [2021-11-09 09:13:23,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1164 states. [2021-11-09 09:13:23,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1164 to 916. [2021-11-09 09:13:23,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 916 states, 915 states have (on average 1.380327868852459) internal successors, (1263), 915 states have internal predecessors, (1263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:23,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 916 states to 916 states and 1263 transitions. [2021-11-09 09:13:23,419 INFO L78 Accepts]: Start accepts. Automaton has 916 states and 1263 transitions. Word has length 37 [2021-11-09 09:13:23,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:13:23,419 INFO L470 AbstractCegarLoop]: Abstraction has 916 states and 1263 transitions. [2021-11-09 09:13:23,420 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.3) internal successors, (39), 30 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:23,420 INFO L276 IsEmpty]: Start isEmpty. Operand 916 states and 1263 transitions. [2021-11-09 09:13:23,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-09 09:13:23,422 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:13:23,422 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:13:23,482 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-09 09:13:23,636 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2021-11-09 09:13:23,636 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:13:23,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:13:23,636 INFO L85 PathProgramCache]: Analyzing trace with hash -1506070490, now seen corresponding path program 11 times [2021-11-09 09:13:23,637 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:13:23,637 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1482990459] [2021-11-09 09:13:23,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:13:23,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:13:23,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:13:23,808 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-09 09:13:23,808 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:13:23,808 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1482990459] [2021-11-09 09:13:23,809 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1482990459] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:23,809 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2045581559] [2021-11-09 09:13:23,809 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-09 09:13:23,810 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:13:23,810 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:13:23,811 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:13:23,837 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-09 09:13:25,036 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-09 09:13:25,036 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:13:25,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-09 09:13:25,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:13:25,144 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-09 09:13:25,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2045581559] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:25,145 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:13:25,145 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 9 [2021-11-09 09:13:25,145 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165925962] [2021-11-09 09:13:25,145 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-09 09:13:25,146 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:13:25,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-09 09:13:25,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-09 09:13:25,146 INFO L87 Difference]: Start difference. First operand 916 states and 1263 transitions. Second operand has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:25,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:13:25,289 INFO L93 Difference]: Finished difference Result 1945 states and 2533 transitions. [2021-11-09 09:13:25,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-09 09:13:25,290 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-09 09:13:25,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:13:25,293 INFO L225 Difference]: With dead ends: 1945 [2021-11-09 09:13:25,293 INFO L226 Difference]: Without dead ends: 1711 [2021-11-09 09:13:25,294 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-09 09:13:25,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1711 states. [2021-11-09 09:13:25,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1711 to 929. [2021-11-09 09:13:25,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 929 states, 928 states have (on average 1.3502155172413792) internal successors, (1253), 928 states have internal predecessors, (1253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:25,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 929 states to 929 states and 1253 transitions. [2021-11-09 09:13:25,333 INFO L78 Accepts]: Start accepts. Automaton has 929 states and 1253 transitions. Word has length 38 [2021-11-09 09:13:25,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:13:25,333 INFO L470 AbstractCegarLoop]: Abstraction has 929 states and 1253 transitions. [2021-11-09 09:13:25,333 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:25,333 INFO L276 IsEmpty]: Start isEmpty. Operand 929 states and 1253 transitions. [2021-11-09 09:13:25,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-09 09:13:25,335 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:13:25,335 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:13:25,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-09 09:13:25,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:13:25,535 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:13:25,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:13:25,536 INFO L85 PathProgramCache]: Analyzing trace with hash 857975207, now seen corresponding path program 8 times [2021-11-09 09:13:25,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:13:25,536 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [965786819] [2021-11-09 09:13:25,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:13:25,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:13:25,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:13:25,817 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-09 09:13:25,817 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:13:25,817 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [965786819] [2021-11-09 09:13:25,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [965786819] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:25,818 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257753676] [2021-11-09 09:13:25,818 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 09:13:25,818 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:13:25,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:13:25,824 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:13:25,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-09 09:13:26,527 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 09:13:26,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:13:26,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-09 09:13:26,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:13:26,692 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-09 09:13:26,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [257753676] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:26,693 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:13:26,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2021-11-09 09:13:26,693 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062005585] [2021-11-09 09:13:26,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-09 09:13:26,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:13:26,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-09 09:13:26,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=238, Unknown=0, NotChecked=0, Total=272 [2021-11-09 09:13:26,694 INFO L87 Difference]: Start difference. First operand 929 states and 1253 transitions. Second operand has 17 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 17 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:27,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:13:27,170 INFO L93 Difference]: Finished difference Result 1074 states and 1421 transitions. [2021-11-09 09:13:27,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-09 09:13:27,170 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 17 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-09 09:13:27,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:13:27,172 INFO L225 Difference]: With dead ends: 1074 [2021-11-09 09:13:27,172 INFO L226 Difference]: Without dead ends: 1052 [2021-11-09 09:13:27,173 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2021-11-09 09:13:27,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1052 states. [2021-11-09 09:13:27,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1052 to 929. [2021-11-09 09:13:27,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 929 states, 928 states have (on average 1.3491379310344827) internal successors, (1252), 928 states have internal predecessors, (1252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:27,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 929 states to 929 states and 1252 transitions. [2021-11-09 09:13:27,234 INFO L78 Accepts]: Start accepts. Automaton has 929 states and 1252 transitions. Word has length 38 [2021-11-09 09:13:27,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:13:27,234 INFO L470 AbstractCegarLoop]: Abstraction has 929 states and 1252 transitions. [2021-11-09 09:13:27,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 17 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:27,235 INFO L276 IsEmpty]: Start isEmpty. Operand 929 states and 1252 transitions. [2021-11-09 09:13:27,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-09 09:13:27,236 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:13:27,236 INFO L513 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:13:27,264 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-09 09:13:27,436 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-11-09 09:13:27,436 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:13:27,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:13:27,437 INFO L85 PathProgramCache]: Analyzing trace with hash 491807239, now seen corresponding path program 26 times [2021-11-09 09:13:27,437 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:13:27,437 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734798860] [2021-11-09 09:13:27,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:13:27,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:13:27,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:13:28,142 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:13:28,143 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:13:28,143 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734798860] [2021-11-09 09:13:28,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1734798860] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:28,143 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [455141857] [2021-11-09 09:13:28,143 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 09:13:28,143 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:13:28,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:13:28,148 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:13:28,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-09 09:13:28,856 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 09:13:28,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:13:28,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-09 09:13:28,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:13:29,097 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:13:29,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [455141857] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:29,097 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:13:29,097 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 31 [2021-11-09 09:13:29,097 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367948188] [2021-11-09 09:13:29,098 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-09 09:13:29,098 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:13:29,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-09 09:13:29,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=870, Unknown=0, NotChecked=0, Total=930 [2021-11-09 09:13:29,099 INFO L87 Difference]: Start difference. First operand 929 states and 1252 transitions. Second operand has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:30,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:13:30,761 INFO L93 Difference]: Finished difference Result 1291 states and 1915 transitions. [2021-11-09 09:13:30,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-09 09:13:30,761 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-09 09:13:30,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:13:30,763 INFO L225 Difference]: With dead ends: 1291 [2021-11-09 09:13:30,763 INFO L226 Difference]: Without dead ends: 1253 [2021-11-09 09:13:30,764 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=65, Invalid=927, Unknown=0, NotChecked=0, Total=992 [2021-11-09 09:13:30,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1253 states. [2021-11-09 09:13:30,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1253 to 964. [2021-11-09 09:13:30,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 964 states, 963 states have (on average 1.35202492211838) internal successors, (1302), 963 states have internal predecessors, (1302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:30,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 964 states to 964 states and 1302 transitions. [2021-11-09 09:13:30,803 INFO L78 Accepts]: Start accepts. Automaton has 964 states and 1302 transitions. Word has length 38 [2021-11-09 09:13:30,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:13:30,803 INFO L470 AbstractCegarLoop]: Abstraction has 964 states and 1302 transitions. [2021-11-09 09:13:30,803 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:30,804 INFO L276 IsEmpty]: Start isEmpty. Operand 964 states and 1302 transitions. [2021-11-09 09:13:30,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-09 09:13:30,805 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:13:30,805 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:13:30,827 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Ended with exit code 0 [2021-11-09 09:13:31,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-11-09 09:13:31,005 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:13:31,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:13:31,006 INFO L85 PathProgramCache]: Analyzing trace with hash 1062375293, now seen corresponding path program 9 times [2021-11-09 09:13:31,006 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:13:31,006 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1770187115] [2021-11-09 09:13:31,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:13:31,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:13:31,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:13:31,219 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-09 09:13:31,219 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:13:31,219 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1770187115] [2021-11-09 09:13:31,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1770187115] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:31,219 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1249787440] [2021-11-09 09:13:31,219 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-09 09:13:31,220 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:13:31,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:13:31,220 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:13:31,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-09 09:13:32,499 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-09 09:13:32,499 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:13:32,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-09 09:13:32,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:13:32,706 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-09 09:13:32,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1249787440] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:32,706 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:13:32,706 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 10] total 24 [2021-11-09 09:13:32,706 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170238657] [2021-11-09 09:13:32,707 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-09 09:13:32,707 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:13:32,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-09 09:13:32,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=500, Unknown=0, NotChecked=0, Total=552 [2021-11-09 09:13:32,707 INFO L87 Difference]: Start difference. First operand 964 states and 1302 transitions. Second operand has 24 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:33,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:13:33,922 INFO L93 Difference]: Finished difference Result 1224 states and 1600 transitions. [2021-11-09 09:13:33,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-09 09:13:33,922 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-09 09:13:33,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:13:33,924 INFO L225 Difference]: With dead ends: 1224 [2021-11-09 09:13:33,924 INFO L226 Difference]: Without dead ends: 1036 [2021-11-09 09:13:33,924 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=172, Invalid=2278, Unknown=0, NotChecked=0, Total=2450 [2021-11-09 09:13:33,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1036 states. [2021-11-09 09:13:33,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1036 to 917. [2021-11-09 09:13:33,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 917 states, 916 states have (on average 1.3329694323144106) internal successors, (1221), 916 states have internal predecessors, (1221), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:33,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 917 states to 917 states and 1221 transitions. [2021-11-09 09:13:33,963 INFO L78 Accepts]: Start accepts. Automaton has 917 states and 1221 transitions. Word has length 39 [2021-11-09 09:13:33,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:13:33,963 INFO L470 AbstractCegarLoop]: Abstraction has 917 states and 1221 transitions. [2021-11-09 09:13:33,963 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:33,963 INFO L276 IsEmpty]: Start isEmpty. Operand 917 states and 1221 transitions. [2021-11-09 09:13:33,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-09 09:13:33,965 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:13:33,965 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:13:33,971 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2021-11-09 09:13:34,171 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:13:34,172 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:13:34,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:13:34,173 INFO L85 PathProgramCache]: Analyzing trace with hash 377237085, now seen corresponding path program 9 times [2021-11-09 09:13:34,173 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:13:34,173 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897014253] [2021-11-09 09:13:34,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:13:34,173 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:13:34,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:13:34,607 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:13:34,607 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:13:34,608 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897014253] [2021-11-09 09:13:34,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [897014253] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:34,608 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1182311053] [2021-11-09 09:13:34,608 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-09 09:13:34,608 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:13:34,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:13:34,612 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:13:34,628 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-09 09:13:35,657 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-09 09:13:35,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:13:35,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-09 09:13:35,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:13:35,881 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:13:35,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1182311053] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:35,882 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:13:35,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 23 [2021-11-09 09:13:35,882 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210461973] [2021-11-09 09:13:35,883 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-09 09:13:35,883 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:13:35,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-09 09:13:35,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2021-11-09 09:13:35,884 INFO L87 Difference]: Start difference. First operand 917 states and 1221 transitions. Second operand has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 23 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:39,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:13:39,992 INFO L93 Difference]: Finished difference Result 1697 states and 2345 transitions. [2021-11-09 09:13:39,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2021-11-09 09:13:39,993 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 23 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-09 09:13:39,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:13:39,995 INFO L225 Difference]: With dead ends: 1697 [2021-11-09 09:13:39,995 INFO L226 Difference]: Without dead ends: 1554 [2021-11-09 09:13:39,996 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4851 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=450, Invalid=14312, Unknown=0, NotChecked=0, Total=14762 [2021-11-09 09:13:39,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1554 states. [2021-11-09 09:13:40,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1554 to 998. [2021-11-09 09:13:40,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 998 states, 997 states have (on average 1.3259779338014042) internal successors, (1322), 997 states have internal predecessors, (1322), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:40,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 998 states to 998 states and 1322 transitions. [2021-11-09 09:13:40,033 INFO L78 Accepts]: Start accepts. Automaton has 998 states and 1322 transitions. Word has length 39 [2021-11-09 09:13:40,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:13:40,033 INFO L470 AbstractCegarLoop]: Abstraction has 998 states and 1322 transitions. [2021-11-09 09:13:40,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 23 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:40,033 INFO L276 IsEmpty]: Start isEmpty. Operand 998 states and 1322 transitions. [2021-11-09 09:13:40,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-09 09:13:40,034 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:13:40,034 INFO L513 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:13:40,041 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-09 09:13:40,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-11-09 09:13:40,235 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:13:40,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:13:40,235 INFO L85 PathProgramCache]: Analyzing trace with hash 519636076, now seen corresponding path program 27 times [2021-11-09 09:13:40,235 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:13:40,236 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [281267713] [2021-11-09 09:13:40,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:13:40,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:13:40,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:13:40,995 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:13:40,995 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:13:40,995 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [281267713] [2021-11-09 09:13:40,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [281267713] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:40,996 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1574386592] [2021-11-09 09:13:40,996 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-09 09:13:40,996 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:13:40,996 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:13:41,000 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:13:41,020 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-09 09:13:43,780 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-09 09:13:43,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:13:43,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-09 09:13:43,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:13:44,004 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:13:44,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1574386592] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:44,005 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:13:44,005 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 31 [2021-11-09 09:13:44,005 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275480556] [2021-11-09 09:13:44,005 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-09 09:13:44,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:13:44,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-09 09:13:44,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2021-11-09 09:13:44,006 INFO L87 Difference]: Start difference. First operand 998 states and 1322 transitions. Second operand has 31 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 31 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:45,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:13:45,889 INFO L93 Difference]: Finished difference Result 1330 states and 1912 transitions. [2021-11-09 09:13:45,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-09 09:13:45,889 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 31 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-09 09:13:45,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:13:45,891 INFO L225 Difference]: With dead ends: 1330 [2021-11-09 09:13:45,891 INFO L226 Difference]: Without dead ends: 1274 [2021-11-09 09:13:45,891 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2021-11-09 09:13:45,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1274 states. [2021-11-09 09:13:45,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1274 to 1033. [2021-11-09 09:13:45,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1033 states, 1032 states have (on average 1.3284883720930232) internal successors, (1371), 1032 states have internal predecessors, (1371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:45,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1033 states to 1033 states and 1371 transitions. [2021-11-09 09:13:45,945 INFO L78 Accepts]: Start accepts. Automaton has 1033 states and 1371 transitions. Word has length 39 [2021-11-09 09:13:45,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:13:45,945 INFO L470 AbstractCegarLoop]: Abstraction has 1033 states and 1371 transitions. [2021-11-09 09:13:45,946 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 31 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:45,946 INFO L276 IsEmpty]: Start isEmpty. Operand 1033 states and 1371 transitions. [2021-11-09 09:13:45,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-09 09:13:45,947 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:13:45,947 INFO L513 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:13:45,954 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-09 09:13:46,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-11-09 09:13:46,148 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:13:46,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:13:46,148 INFO L85 PathProgramCache]: Analyzing trace with hash 1382330023, now seen corresponding path program 28 times [2021-11-09 09:13:46,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:13:46,148 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1706478794] [2021-11-09 09:13:46,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:13:46,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:13:46,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:13:46,825 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:13:46,825 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:13:46,825 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1706478794] [2021-11-09 09:13:46,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1706478794] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:46,825 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1139562164] [2021-11-09 09:13:46,825 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-09 09:13:46,825 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:13:46,825 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:13:46,826 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:13:46,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-09 09:13:47,665 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-09 09:13:47,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:13:47,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-09 09:13:47,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:13:47,899 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:13:47,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1139562164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:47,899 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:13:47,899 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 33 [2021-11-09 09:13:47,900 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630308265] [2021-11-09 09:13:47,900 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-09 09:13:47,900 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:13:47,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-09 09:13:47,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=992, Unknown=0, NotChecked=0, Total=1056 [2021-11-09 09:13:47,901 INFO L87 Difference]: Start difference. First operand 1033 states and 1371 transitions. Second operand has 33 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 33 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:50,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:13:50,119 INFO L93 Difference]: Finished difference Result 1373 states and 1977 transitions. [2021-11-09 09:13:50,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-09 09:13:50,120 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 33 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-09 09:13:50,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:13:50,122 INFO L225 Difference]: With dead ends: 1373 [2021-11-09 09:13:50,122 INFO L226 Difference]: Without dead ends: 1317 [2021-11-09 09:13:50,123 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=69, Invalid=1053, Unknown=0, NotChecked=0, Total=1122 [2021-11-09 09:13:50,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1317 states. [2021-11-09 09:13:50,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1317 to 1068. [2021-11-09 09:13:50,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1068 states, 1067 states have (on average 1.330834114339269) internal successors, (1420), 1067 states have internal predecessors, (1420), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:50,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1068 states to 1068 states and 1420 transitions. [2021-11-09 09:13:50,161 INFO L78 Accepts]: Start accepts. Automaton has 1068 states and 1420 transitions. Word has length 40 [2021-11-09 09:13:50,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:13:50,162 INFO L470 AbstractCegarLoop]: Abstraction has 1068 states and 1420 transitions. [2021-11-09 09:13:50,162 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 33 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:13:50,162 INFO L276 IsEmpty]: Start isEmpty. Operand 1068 states and 1420 transitions. [2021-11-09 09:13:50,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-09 09:13:50,163 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:13:50,163 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:13:50,193 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Ended with exit code 0 [2021-11-09 09:13:50,364 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-09 09:13:50,364 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:13:50,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:13:50,365 INFO L85 PathProgramCache]: Analyzing trace with hash 1770910093, now seen corresponding path program 10 times [2021-11-09 09:13:50,365 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:13:50,365 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496280865] [2021-11-09 09:13:50,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:13:50,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:13:50,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:13:50,777 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-09 09:13:50,777 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:13:50,777 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496280865] [2021-11-09 09:13:50,778 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496280865] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:50,778 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1756311109] [2021-11-09 09:13:50,778 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-09 09:13:50,778 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:13:50,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:13:50,781 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:13:50,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-09 09:13:51,749 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-09 09:13:51,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:13:51,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-09 09:13:51,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:13:52,237 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 18 proven. 81 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-09 09:13:52,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1756311109] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:13:52,237 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:13:52,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 12] total 33 [2021-11-09 09:13:52,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269399724] [2021-11-09 09:13:52,237 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-09 09:13:52,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:13:52,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-09 09:13:52,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=984, Unknown=0, NotChecked=0, Total=1056 [2021-11-09 09:13:52,238 INFO L87 Difference]: Start difference. First operand 1068 states and 1420 transitions. Second operand has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 33 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:15,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:16:15,688 INFO L93 Difference]: Finished difference Result 2919 states and 3775 transitions. [2021-11-09 09:16:15,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 216 states. [2021-11-09 09:16:15,688 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 33 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-09 09:16:15,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:16:15,692 INFO L225 Difference]: With dead ends: 2919 [2021-11-09 09:16:15,692 INFO L226 Difference]: Without dead ends: 2759 [2021-11-09 09:16:15,698 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 232 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20236 ImplicationChecksByTransitivity, 115.1s TimeCoverageRelationStatistics Valid=4172, Invalid=50350, Unknown=0, NotChecked=0, Total=54522 [2021-11-09 09:16:15,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2759 states. [2021-11-09 09:16:15,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2759 to 1059. [2021-11-09 09:16:15,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1059 states, 1058 states have (on average 1.3251417769376181) internal successors, (1402), 1058 states have internal predecessors, (1402), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:15,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1059 states to 1059 states and 1402 transitions. [2021-11-09 09:16:15,782 INFO L78 Accepts]: Start accepts. Automaton has 1059 states and 1402 transitions. Word has length 41 [2021-11-09 09:16:15,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:16:15,782 INFO L470 AbstractCegarLoop]: Abstraction has 1059 states and 1402 transitions. [2021-11-09 09:16:15,782 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 33 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:15,782 INFO L276 IsEmpty]: Start isEmpty. Operand 1059 states and 1402 transitions. [2021-11-09 09:16:15,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-09 09:16:15,784 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:16:15,784 INFO L513 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:16:15,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-09 09:16:16,004 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-09 09:16:16,004 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:16:16,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:16:16,004 INFO L85 PathProgramCache]: Analyzing trace with hash -1938928692, now seen corresponding path program 29 times [2021-11-09 09:16:16,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:16:16,005 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847441213] [2021-11-09 09:16:16,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:16:16,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:16:16,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:16:16,778 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:16:16,778 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:16:16,778 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847441213] [2021-11-09 09:16:16,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1847441213] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:16:16,779 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1699295400] [2021-11-09 09:16:16,779 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-09 09:16:16,779 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:16:16,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:16:16,780 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:16:16,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-09 09:16:21,260 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2021-11-09 09:16:21,260 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:16:21,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-09 09:16:21,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:16:21,540 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:16:21,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1699295400] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:16:21,541 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:16:21,541 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2021-11-09 09:16:21,541 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039207163] [2021-11-09 09:16:21,541 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-09 09:16:21,541 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:16:21,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-09 09:16:21,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=1056, Unknown=0, NotChecked=0, Total=1122 [2021-11-09 09:16:21,542 INFO L87 Difference]: Start difference. First operand 1059 states and 1402 transitions. Second operand has 34 states, 34 states have (on average 1.2647058823529411) internal successors, (43), 34 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:23,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:16:23,766 INFO L93 Difference]: Finished difference Result 1406 states and 2021 transitions. [2021-11-09 09:16:23,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-09 09:16:23,766 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.2647058823529411) internal successors, (43), 34 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-09 09:16:23,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:16:23,768 INFO L225 Difference]: With dead ends: 1406 [2021-11-09 09:16:23,768 INFO L226 Difference]: Without dead ends: 1350 [2021-11-09 09:16:23,769 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=71, Invalid=1119, Unknown=0, NotChecked=0, Total=1190 [2021-11-09 09:16:23,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1350 states. [2021-11-09 09:16:23,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1350 to 1094. [2021-11-09 09:16:23,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1094 states, 1093 states have (on average 1.3275388838060385) internal successors, (1451), 1093 states have internal predecessors, (1451), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:23,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1094 states to 1094 states and 1451 transitions. [2021-11-09 09:16:23,824 INFO L78 Accepts]: Start accepts. Automaton has 1094 states and 1451 transitions. Word has length 41 [2021-11-09 09:16:23,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:16:23,825 INFO L470 AbstractCegarLoop]: Abstraction has 1094 states and 1451 transitions. [2021-11-09 09:16:23,825 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.2647058823529411) internal successors, (43), 34 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:23,825 INFO L276 IsEmpty]: Start isEmpty. Operand 1094 states and 1451 transitions. [2021-11-09 09:16:23,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-09 09:16:23,827 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:16:23,827 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:16:23,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2021-11-09 09:16:24,032 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable60 [2021-11-09 09:16:24,032 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:16:24,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:16:24,033 INFO L85 PathProgramCache]: Analyzing trace with hash -2041166362, now seen corresponding path program 12 times [2021-11-09 09:16:24,033 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:16:24,033 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656023196] [2021-11-09 09:16:24,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:16:24,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:16:24,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:16:24,900 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 75 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-09 09:16:24,900 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:16:24,900 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656023196] [2021-11-09 09:16:24,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1656023196] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:16:24,900 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1931899562] [2021-11-09 09:16:24,901 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-09 09:16:24,901 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:16:24,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:16:24,902 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:16:24,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-09 09:16:26,310 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-11-09 09:16:26,311 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:16:26,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 91 conjunts are in the unsatisfiable core [2021-11-09 09:16:26,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:16:27,573 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:16:27,573 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1931899562] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:16:27,573 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:16:27,573 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 31] total 39 [2021-11-09 09:16:27,573 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125242004] [2021-11-09 09:16:27,574 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-09 09:16:27,574 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:16:27,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-09 09:16:27,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1376, Unknown=0, NotChecked=0, Total=1482 [2021-11-09 09:16:27,574 INFO L87 Difference]: Start difference. First operand 1094 states and 1451 transitions. Second operand has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 39 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:28,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:16:28,825 INFO L93 Difference]: Finished difference Result 1110 states and 1466 transitions. [2021-11-09 09:16:28,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-09 09:16:28,826 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 39 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-09 09:16:28,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:16:28,829 INFO L225 Difference]: With dead ends: 1110 [2021-11-09 09:16:28,829 INFO L226 Difference]: Without dead ends: 1075 [2021-11-09 09:16:28,830 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 424 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=158, Invalid=2004, Unknown=0, NotChecked=0, Total=2162 [2021-11-09 09:16:28,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1075 states. [2021-11-09 09:16:28,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1075 to 1075. [2021-11-09 09:16:28,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1075 states, 1074 states have (on average 1.3324022346368716) internal successors, (1431), 1074 states have internal predecessors, (1431), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:28,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1075 states to 1075 states and 1431 transitions. [2021-11-09 09:16:28,885 INFO L78 Accepts]: Start accepts. Automaton has 1075 states and 1431 transitions. Word has length 42 [2021-11-09 09:16:28,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:16:28,886 INFO L470 AbstractCegarLoop]: Abstraction has 1075 states and 1431 transitions. [2021-11-09 09:16:28,886 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 39 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:28,886 INFO L276 IsEmpty]: Start isEmpty. Operand 1075 states and 1431 transitions. [2021-11-09 09:16:28,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-09 09:16:28,888 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:16:28,888 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:16:28,896 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2021-11-09 09:16:29,096 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:16:29,096 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:16:29,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:16:29,097 INFO L85 PathProgramCache]: Analyzing trace with hash 1591776935, now seen corresponding path program 13 times [2021-11-09 09:16:29,097 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:16:29,097 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1876948099] [2021-11-09 09:16:29,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:16:29,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:16:29,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:16:29,294 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2021-11-09 09:16:29,294 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:16:29,294 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1876948099] [2021-11-09 09:16:29,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1876948099] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:16:29,295 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [994312761] [2021-11-09 09:16:29,295 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-09 09:16:29,295 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:16:29,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:16:29,300 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:16:29,302 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-09 09:16:30,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:16:30,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-09 09:16:30,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:16:30,426 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 12 proven. 30 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-09 09:16:30,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [994312761] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:16:30,426 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:16:30,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 17 [2021-11-09 09:16:30,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791688553] [2021-11-09 09:16:30,427 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-09 09:16:30,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:16:30,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-09 09:16:30,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=189, Unknown=0, NotChecked=0, Total=272 [2021-11-09 09:16:30,428 INFO L87 Difference]: Start difference. First operand 1075 states and 1431 transitions. Second operand has 17 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 17 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:31,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:16:31,806 INFO L93 Difference]: Finished difference Result 3042 states and 4004 transitions. [2021-11-09 09:16:31,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-09 09:16:31,807 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 17 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-09 09:16:31,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:16:31,811 INFO L225 Difference]: With dead ends: 3042 [2021-11-09 09:16:31,812 INFO L226 Difference]: Without dead ends: 2727 [2021-11-09 09:16:31,813 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=338, Invalid=784, Unknown=0, NotChecked=0, Total=1122 [2021-11-09 09:16:31,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2727 states. [2021-11-09 09:16:31,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2727 to 1226. [2021-11-09 09:16:31,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1226 states, 1225 states have (on average 1.3444897959183673) internal successors, (1647), 1225 states have internal predecessors, (1647), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:31,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1226 states to 1226 states and 1647 transitions. [2021-11-09 09:16:31,889 INFO L78 Accepts]: Start accepts. Automaton has 1226 states and 1647 transitions. Word has length 42 [2021-11-09 09:16:31,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:16:31,890 INFO L470 AbstractCegarLoop]: Abstraction has 1226 states and 1647 transitions. [2021-11-09 09:16:31,890 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 17 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:31,890 INFO L276 IsEmpty]: Start isEmpty. Operand 1226 states and 1647 transitions. [2021-11-09 09:16:31,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-09 09:16:31,892 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:16:31,892 INFO L513 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:16:31,933 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2021-11-09 09:16:32,120 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:16:32,120 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:16:32,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:16:32,121 INFO L85 PathProgramCache]: Analyzing trace with hash -1818733753, now seen corresponding path program 30 times [2021-11-09 09:16:32,121 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:16:32,121 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30466035] [2021-11-09 09:16:32,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:16:32,121 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:16:32,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:16:32,842 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:16:32,842 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:16:32,843 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30466035] [2021-11-09 09:16:32,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30466035] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:16:32,843 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995097392] [2021-11-09 09:16:32,843 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-09 09:16:32,843 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:16:32,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:16:32,856 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:16:32,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-09 09:16:36,059 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2021-11-09 09:16:36,059 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:16:36,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-09 09:16:36,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:16:36,343 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:16:36,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995097392] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:16:36,343 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:16:36,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34] total 35 [2021-11-09 09:16:36,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766449663] [2021-11-09 09:16:36,344 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-09 09:16:36,344 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:16:36,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-09 09:16:36,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=1122, Unknown=0, NotChecked=0, Total=1190 [2021-11-09 09:16:36,345 INFO L87 Difference]: Start difference. First operand 1226 states and 1647 transitions. Second operand has 35 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 35 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:38,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:16:38,878 INFO L93 Difference]: Finished difference Result 1698 states and 2508 transitions. [2021-11-09 09:16:38,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-09 09:16:38,879 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 35 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-09 09:16:38,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:16:38,882 INFO L225 Difference]: With dead ends: 1698 [2021-11-09 09:16:38,883 INFO L226 Difference]: Without dead ends: 1633 [2021-11-09 09:16:38,884 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=73, Invalid=1187, Unknown=0, NotChecked=0, Total=1260 [2021-11-09 09:16:38,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1633 states. [2021-11-09 09:16:38,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1633 to 1267. [2021-11-09 09:16:38,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1267 states, 1266 states have (on average 1.3467614533965244) internal successors, (1705), 1266 states have internal predecessors, (1705), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:38,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1267 states to 1267 states and 1705 transitions. [2021-11-09 09:16:38,974 INFO L78 Accepts]: Start accepts. Automaton has 1267 states and 1705 transitions. Word has length 42 [2021-11-09 09:16:38,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:16:38,974 INFO L470 AbstractCegarLoop]: Abstraction has 1267 states and 1705 transitions. [2021-11-09 09:16:38,974 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 35 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:38,974 INFO L276 IsEmpty]: Start isEmpty. Operand 1267 states and 1705 transitions. [2021-11-09 09:16:38,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-09 09:16:38,977 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:16:38,977 INFO L513 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:16:38,992 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2021-11-09 09:16:39,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:16:39,186 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:16:39,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:16:39,187 INFO L85 PathProgramCache]: Analyzing trace with hash 179807437, now seen corresponding path program 11 times [2021-11-09 09:16:39,187 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:16:39,187 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805118508] [2021-11-09 09:16:39,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:16:39,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:16:39,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:16:39,557 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-09 09:16:39,557 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:16:39,557 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [805118508] [2021-11-09 09:16:39,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [805118508] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:16:39,557 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [825159090] [2021-11-09 09:16:39,557 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-09 09:16:39,558 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:16:39,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:16:39,560 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:16:39,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-09 09:16:44,087 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-11-09 09:16:44,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:16:44,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 66 conjunts are in the unsatisfiable core [2021-11-09 09:16:44,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:16:44,686 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-09 09:16:44,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [825159090] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:16:44,687 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:16:44,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 35 [2021-11-09 09:16:44,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903084991] [2021-11-09 09:16:44,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-09 09:16:44,688 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:16:44,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-09 09:16:44,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1101, Unknown=0, NotChecked=0, Total=1190 [2021-11-09 09:16:44,689 INFO L87 Difference]: Start difference. First operand 1267 states and 1705 transitions. Second operand has 35 states, 35 states have (on average 1.3142857142857143) internal successors, (46), 35 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:49,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:16:49,711 INFO L93 Difference]: Finished difference Result 2130 states and 2967 transitions. [2021-11-09 09:16:49,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2021-11-09 09:16:49,712 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.3142857142857143) internal successors, (46), 35 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-09 09:16:49,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:16:49,714 INFO L225 Difference]: With dead ends: 2130 [2021-11-09 09:16:49,714 INFO L226 Difference]: Without dead ends: 1973 [2021-11-09 09:16:49,715 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6105 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=489, Invalid=17601, Unknown=0, NotChecked=0, Total=18090 [2021-11-09 09:16:49,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1973 states. [2021-11-09 09:16:49,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1973 to 1334. [2021-11-09 09:16:49,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1334 states, 1333 states have (on average 1.3465866466616654) internal successors, (1795), 1333 states have internal predecessors, (1795), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:49,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1334 states to 1334 states and 1795 transitions. [2021-11-09 09:16:49,762 INFO L78 Accepts]: Start accepts. Automaton has 1334 states and 1795 transitions. Word has length 43 [2021-11-09 09:16:49,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:16:49,762 INFO L470 AbstractCegarLoop]: Abstraction has 1334 states and 1795 transitions. [2021-11-09 09:16:49,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.3142857142857143) internal successors, (46), 35 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:49,762 INFO L276 IsEmpty]: Start isEmpty. Operand 1334 states and 1795 transitions. [2021-11-09 09:16:49,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-09 09:16:49,764 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:16:49,764 INFO L513 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:16:49,771 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2021-11-09 09:16:49,964 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:16:49,966 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:16:49,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:16:49,967 INFO L85 PathProgramCache]: Analyzing trace with hash 1907309356, now seen corresponding path program 31 times [2021-11-09 09:16:49,967 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:16:49,967 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686960643] [2021-11-09 09:16:49,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:16:49,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:16:50,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:16:50,819 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:16:50,819 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:16:50,819 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686960643] [2021-11-09 09:16:50,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686960643] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:16:50,820 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [120985984] [2021-11-09 09:16:50,820 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-09 09:16:50,820 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:16:50,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:16:50,821 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:16:50,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-09 09:16:51,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:16:51,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-09 09:16:51,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:16:52,106 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:16:52,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [120985984] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:16:52,107 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:16:52,107 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2021-11-09 09:16:52,107 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55912742] [2021-11-09 09:16:52,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-09 09:16:52,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:16:52,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-09 09:16:52,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=1190, Unknown=0, NotChecked=0, Total=1260 [2021-11-09 09:16:52,108 INFO L87 Difference]: Start difference. First operand 1334 states and 1795 transitions. Second operand has 36 states, 36 states have (on average 1.25) internal successors, (45), 36 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:54,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:16:54,637 INFO L93 Difference]: Finished difference Result 1819 states and 2681 transitions. [2021-11-09 09:16:54,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-09 09:16:54,638 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.25) internal successors, (45), 36 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-09 09:16:54,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:16:54,640 INFO L225 Difference]: With dead ends: 1819 [2021-11-09 09:16:54,640 INFO L226 Difference]: Without dead ends: 1754 [2021-11-09 09:16:54,641 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=75, Invalid=1257, Unknown=0, NotChecked=0, Total=1332 [2021-11-09 09:16:54,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1754 states. [2021-11-09 09:16:54,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1754 to 1377. [2021-11-09 09:16:54,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1377 states, 1376 states have (on average 1.3488372093023255) internal successors, (1856), 1376 states have internal predecessors, (1856), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:54,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1377 states to 1377 states and 1856 transitions. [2021-11-09 09:16:54,720 INFO L78 Accepts]: Start accepts. Automaton has 1377 states and 1856 transitions. Word has length 43 [2021-11-09 09:16:54,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:16:54,721 INFO L470 AbstractCegarLoop]: Abstraction has 1377 states and 1856 transitions. [2021-11-09 09:16:54,721 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.25) internal successors, (45), 36 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:16:54,721 INFO L276 IsEmpty]: Start isEmpty. Operand 1377 states and 1856 transitions. [2021-11-09 09:16:54,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-09 09:16:54,724 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:16:54,724 INFO L513 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:16:54,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2021-11-09 09:16:54,948 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:16:54,948 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:16:54,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:16:54,949 INFO L85 PathProgramCache]: Analyzing trace with hash 1450528743, now seen corresponding path program 32 times [2021-11-09 09:16:54,949 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:16:54,949 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [268847509] [2021-11-09 09:16:54,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:16:54,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:16:55,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:16:55,799 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:16:55,799 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:16:55,800 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [268847509] [2021-11-09 09:16:55,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [268847509] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:16:55,800 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [67873352] [2021-11-09 09:16:55,800 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 09:16:55,800 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:16:55,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:16:55,801 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:16:55,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-09 09:16:56,869 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 09:16:56,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:16:56,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-09 09:16:56,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:16:57,188 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:16:57,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [67873352] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:16:57,189 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:16:57,189 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 37 [2021-11-09 09:16:57,189 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806642130] [2021-11-09 09:16:57,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-09 09:16:57,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:16:57,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-09 09:16:57,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=1260, Unknown=0, NotChecked=0, Total=1332 [2021-11-09 09:16:57,190 INFO L87 Difference]: Start difference. First operand 1377 states and 1856 transitions. Second operand has 37 states, 37 states have (on average 1.2432432432432432) internal successors, (46), 37 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:17:00,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:17:00,067 INFO L93 Difference]: Finished difference Result 1873 states and 2764 transitions. [2021-11-09 09:17:00,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-09 09:17:00,068 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.2432432432432432) internal successors, (46), 37 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-09 09:17:00,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:17:00,070 INFO L225 Difference]: With dead ends: 1873 [2021-11-09 09:17:00,070 INFO L226 Difference]: Without dead ends: 1808 [2021-11-09 09:17:00,071 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=77, Invalid=1329, Unknown=0, NotChecked=0, Total=1406 [2021-11-09 09:17:00,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1808 states. [2021-11-09 09:17:00,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1808 to 1420. [2021-11-09 09:17:00,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1420 states, 1419 states have (on average 1.3509513742071881) internal successors, (1917), 1419 states have internal predecessors, (1917), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:17:00,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1420 states to 1420 states and 1917 transitions. [2021-11-09 09:17:00,121 INFO L78 Accepts]: Start accepts. Automaton has 1420 states and 1917 transitions. Word has length 44 [2021-11-09 09:17:00,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:17:00,121 INFO L470 AbstractCegarLoop]: Abstraction has 1420 states and 1917 transitions. [2021-11-09 09:17:00,121 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.2432432432432432) internal successors, (46), 37 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:17:00,121 INFO L276 IsEmpty]: Start isEmpty. Operand 1420 states and 1917 transitions. [2021-11-09 09:17:00,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-09 09:17:00,123 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:17:00,123 INFO L513 BasicCegarLoop]: trace histogram [11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:17:00,151 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Ended with exit code 0 [2021-11-09 09:17:00,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-11-09 09:17:00,328 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:17:00,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:17:00,328 INFO L85 PathProgramCache]: Analyzing trace with hash 1991519901, now seen corresponding path program 12 times [2021-11-09 09:17:00,329 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:17:00,329 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [21754804] [2021-11-09 09:17:00,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:17:00,329 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:17:00,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:17:00,977 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:17:00,977 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:17:00,977 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [21754804] [2021-11-09 09:17:00,978 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [21754804] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:17:00,978 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1642207840] [2021-11-09 09:17:00,978 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-09 09:17:00,978 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:17:00,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:17:00,979 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:17:01,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-09 09:17:02,575 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-09 09:17:02,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:17:02,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-09 09:17:02,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:17:03,084 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2021-11-09 09:17:03,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1642207840] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:17:03,084 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:17:03,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 14] total 39 [2021-11-09 09:17:03,084 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242635055] [2021-11-09 09:17:03,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-09 09:17:03,085 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:17:03,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-09 09:17:03,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=1406, Unknown=0, NotChecked=0, Total=1482 [2021-11-09 09:17:03,085 INFO L87 Difference]: Start difference. First operand 1420 states and 1917 transitions. Second operand has 39 states, 39 states have (on average 1.6666666666666667) internal successors, (65), 39 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:17:14,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:17:14,268 INFO L93 Difference]: Finished difference Result 2836 states and 3870 transitions. [2021-11-09 09:17:14,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 185 states. [2021-11-09 09:17:14,269 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.6666666666666667) internal successors, (65), 39 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-09 09:17:14,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:17:14,271 INFO L225 Difference]: With dead ends: 2836 [2021-11-09 09:17:14,271 INFO L226 Difference]: Without dead ends: 2189 [2021-11-09 09:17:14,273 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12567 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=883, Invalid=38123, Unknown=0, NotChecked=0, Total=39006 [2021-11-09 09:17:14,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2189 states. [2021-11-09 09:17:14,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2189 to 1221. [2021-11-09 09:17:14,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1221 states, 1220 states have (on average 1.301639344262295) internal successors, (1588), 1220 states have internal predecessors, (1588), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:17:14,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1221 states to 1221 states and 1588 transitions. [2021-11-09 09:17:14,336 INFO L78 Accepts]: Start accepts. Automaton has 1221 states and 1588 transitions. Word has length 45 [2021-11-09 09:17:14,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:17:14,336 INFO L470 AbstractCegarLoop]: Abstraction has 1221 states and 1588 transitions. [2021-11-09 09:17:14,336 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.6666666666666667) internal successors, (65), 39 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:17:14,336 INFO L276 IsEmpty]: Start isEmpty. Operand 1221 states and 1588 transitions. [2021-11-09 09:17:14,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-09 09:17:14,338 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:17:14,338 INFO L513 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:17:14,345 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2021-11-09 09:17:14,540 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-11-09 09:17:14,540 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:17:14,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:17:14,540 INFO L85 PathProgramCache]: Analyzing trace with hash 175231628, now seen corresponding path program 33 times [2021-11-09 09:17:14,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:17:14,541 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084192627] [2021-11-09 09:17:14,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:17:14,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:17:14,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:17:15,293 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:17:15,293 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:17:15,293 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084192627] [2021-11-09 09:17:15,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1084192627] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:17:15,293 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1718963931] [2021-11-09 09:17:15,293 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-09 09:17:15,293 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:17:15,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:17:15,294 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:17:15,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-09 09:17:20,433 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-09 09:17:20,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:17:20,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-09 09:17:20,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:17:20,723 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:17:20,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1718963931] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:17:20,724 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:17:20,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 38 [2021-11-09 09:17:20,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890799605] [2021-11-09 09:17:20,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-09 09:17:20,724 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:17:20,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-09 09:17:20,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=1332, Unknown=0, NotChecked=0, Total=1406 [2021-11-09 09:17:20,725 INFO L87 Difference]: Start difference. First operand 1221 states and 1588 transitions. Second operand has 38 states, 38 states have (on average 1.236842105263158) internal successors, (47), 38 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:17:23,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:17:23,413 INFO L93 Difference]: Finished difference Result 1867 states and 2756 transitions. [2021-11-09 09:17:23,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-09 09:17:23,414 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.236842105263158) internal successors, (47), 38 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-09 09:17:23,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:17:23,415 INFO L225 Difference]: With dead ends: 1867 [2021-11-09 09:17:23,415 INFO L226 Difference]: Without dead ends: 1797 [2021-11-09 09:17:23,416 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=79, Invalid=1403, Unknown=0, NotChecked=0, Total=1482 [2021-11-09 09:17:23,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1797 states. [2021-11-09 09:17:23,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1797 to 1252. [2021-11-09 09:17:23,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1252 states, 1251 states have (on average 1.3053557154276578) internal successors, (1633), 1251 states have internal predecessors, (1633), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:17:23,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1252 states to 1252 states and 1633 transitions. [2021-11-09 09:17:23,490 INFO L78 Accepts]: Start accepts. Automaton has 1252 states and 1633 transitions. Word has length 45 [2021-11-09 09:17:23,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:17:23,491 INFO L470 AbstractCegarLoop]: Abstraction has 1252 states and 1633 transitions. [2021-11-09 09:17:23,491 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.236842105263158) internal successors, (47), 38 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:17:23,491 INFO L276 IsEmpty]: Start isEmpty. Operand 1252 states and 1633 transitions. [2021-11-09 09:17:23,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-09 09:17:23,493 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:17:23,493 INFO L513 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:17:23,504 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2021-11-09 09:17:23,702 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:17:23,703 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:17:23,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:17:23,703 INFO L85 PathProgramCache]: Analyzing trace with hash -704273273, now seen corresponding path program 34 times [2021-11-09 09:17:23,703 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:17:23,703 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637937638] [2021-11-09 09:17:23,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:17:23,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:17:23,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:17:24,601 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:17:24,601 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:17:24,601 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637937638] [2021-11-09 09:17:24,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1637937638] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:17:24,601 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1826945012] [2021-11-09 09:17:24,601 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-09 09:17:24,602 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:17:24,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:17:24,603 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:17:24,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2021-11-09 09:17:25,640 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-09 09:17:25,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:17:25,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-09 09:17:25,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:17:25,910 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:17:25,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1826945012] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:17:25,910 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:17:25,910 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 39 [2021-11-09 09:17:25,911 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86250708] [2021-11-09 09:17:25,911 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-09 09:17:25,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:17:25,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-09 09:17:25,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=1406, Unknown=0, NotChecked=0, Total=1482 [2021-11-09 09:17:25,912 INFO L87 Difference]: Start difference. First operand 1252 states and 1633 transitions. Second operand has 39 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:17:28,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:17:28,766 INFO L93 Difference]: Finished difference Result 1912 states and 2829 transitions. [2021-11-09 09:17:28,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-09 09:17:28,766 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-09 09:17:28,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:17:28,768 INFO L225 Difference]: With dead ends: 1912 [2021-11-09 09:17:28,768 INFO L226 Difference]: Without dead ends: 1842 [2021-11-09 09:17:28,768 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=81, Invalid=1479, Unknown=0, NotChecked=0, Total=1560 [2021-11-09 09:17:28,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1842 states. [2021-11-09 09:17:28,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1842 to 1283. [2021-11-09 09:17:28,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1283 states, 1282 states have (on average 1.3088923556942278) internal successors, (1678), 1282 states have internal predecessors, (1678), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:17:28,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1283 states to 1283 states and 1678 transitions. [2021-11-09 09:17:28,813 INFO L78 Accepts]: Start accepts. Automaton has 1283 states and 1678 transitions. Word has length 46 [2021-11-09 09:17:28,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:17:28,813 INFO L470 AbstractCegarLoop]: Abstraction has 1283 states and 1678 transitions. [2021-11-09 09:17:28,814 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:17:28,814 INFO L276 IsEmpty]: Start isEmpty. Operand 1283 states and 1678 transitions. [2021-11-09 09:17:28,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-09 09:17:28,815 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:17:28,815 INFO L513 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:17:28,840 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Forceful destruction successful, exit code 0 [2021-11-09 09:17:29,016 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:17:29,016 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:17:29,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:17:29,016 INFO L85 PathProgramCache]: Analyzing trace with hash 2095845868, now seen corresponding path program 35 times [2021-11-09 09:17:29,016 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:17:29,016 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1815795060] [2021-11-09 09:17:29,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:17:29,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:17:29,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:17:29,890 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:17:29,890 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:17:29,890 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1815795060] [2021-11-09 09:17:29,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1815795060] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:17:29,891 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [324650968] [2021-11-09 09:17:29,891 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-09 09:17:29,891 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:17:29,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:17:29,892 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:17:29,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-09 09:18:22,183 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2021-11-09 09:18:22,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:18:22,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 75 conjunts are in the unsatisfiable core [2021-11-09 09:18:22,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:18:22,459 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:18:22,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [324650968] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:18:22,459 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:18:22,459 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2021-11-09 09:18:22,459 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490572522] [2021-11-09 09:18:22,459 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-09 09:18:22,459 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:18:22,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-09 09:18:22,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=1482, Unknown=0, NotChecked=0, Total=1560 [2021-11-09 09:18:22,460 INFO L87 Difference]: Start difference. First operand 1283 states and 1678 transitions. Second operand has 40 states, 40 states have (on average 1.225) internal successors, (49), 40 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:18:25,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:18:25,214 INFO L93 Difference]: Finished difference Result 1957 states and 2902 transitions. [2021-11-09 09:18:25,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-09 09:18:25,214 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.225) internal successors, (49), 40 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-09 09:18:25,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:18:25,216 INFO L225 Difference]: With dead ends: 1957 [2021-11-09 09:18:25,216 INFO L226 Difference]: Without dead ends: 1887 [2021-11-09 09:18:25,216 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=83, Invalid=1557, Unknown=0, NotChecked=0, Total=1640 [2021-11-09 09:18:25,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1887 states. [2021-11-09 09:18:25,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1887 to 1314. [2021-11-09 09:18:25,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1314 states, 1313 states have (on average 1.3122619954303123) internal successors, (1723), 1313 states have internal predecessors, (1723), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:18:25,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1314 states to 1314 states and 1723 transitions. [2021-11-09 09:18:25,268 INFO L78 Accepts]: Start accepts. Automaton has 1314 states and 1723 transitions. Word has length 47 [2021-11-09 09:18:25,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:18:25,268 INFO L470 AbstractCegarLoop]: Abstraction has 1314 states and 1723 transitions. [2021-11-09 09:18:25,268 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.225) internal successors, (49), 40 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:18:25,268 INFO L276 IsEmpty]: Start isEmpty. Operand 1314 states and 1723 transitions. [2021-11-09 09:18:25,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-09 09:18:25,270 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:18:25,270 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:18:25,279 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2021-11-09 09:18:25,470 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:18:25,470 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:18:25,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:18:25,471 INFO L85 PathProgramCache]: Analyzing trace with hash 1867421639, now seen corresponding path program 14 times [2021-11-09 09:18:25,471 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:18:25,471 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500646923] [2021-11-09 09:18:25,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:18:25,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:18:25,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:18:26,374 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-09 09:18:26,374 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:18:26,375 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1500646923] [2021-11-09 09:18:26,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1500646923] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:18:26,375 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966751866] [2021-11-09 09:18:26,375 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 09:18:26,375 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:18:26,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:18:26,383 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:18:26,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-09 09:18:27,636 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 09:18:27,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:18:27,639 WARN L261 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 119 conjunts are in the unsatisfiable core [2021-11-09 09:18:27,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:18:29,032 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:18:29,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1966751866] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:18:29,033 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:18:29,033 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 36] total 45 [2021-11-09 09:18:29,033 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003430123] [2021-11-09 09:18:29,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-09 09:18:29,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:18:29,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-09 09:18:29,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1857, Unknown=0, NotChecked=0, Total=1980 [2021-11-09 09:18:29,034 INFO L87 Difference]: Start difference. First operand 1314 states and 1723 transitions. Second operand has 45 states, 45 states have (on average 1.8222222222222222) internal successors, (82), 45 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:18:30,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:18:30,333 INFO L93 Difference]: Finished difference Result 1325 states and 1733 transitions. [2021-11-09 09:18:30,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-09 09:18:30,334 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.8222222222222222) internal successors, (82), 45 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-09 09:18:30,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:18:30,335 INFO L225 Difference]: With dead ends: 1325 [2021-11-09 09:18:30,335 INFO L226 Difference]: Without dead ends: 1285 [2021-11-09 09:18:30,336 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 606 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=181, Invalid=2681, Unknown=0, NotChecked=0, Total=2862 [2021-11-09 09:18:30,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1285 states. [2021-11-09 09:18:30,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1285 to 1285. [2021-11-09 09:18:30,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1285 states, 1284 states have (on average 1.3185358255451713) internal successors, (1693), 1284 states have internal predecessors, (1693), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:18:30,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1285 states to 1285 states and 1693 transitions. [2021-11-09 09:18:30,381 INFO L78 Accepts]: Start accepts. Automaton has 1285 states and 1693 transitions. Word has length 48 [2021-11-09 09:18:30,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:18:30,381 INFO L470 AbstractCegarLoop]: Abstraction has 1285 states and 1693 transitions. [2021-11-09 09:18:30,382 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.8222222222222222) internal successors, (82), 45 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:18:30,382 INFO L276 IsEmpty]: Start isEmpty. Operand 1285 states and 1693 transitions. [2021-11-09 09:18:30,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-09 09:18:30,383 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:18:30,383 INFO L513 BasicCegarLoop]: trace histogram [12, 12, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:18:30,407 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Forceful destruction successful, exit code 0 [2021-11-09 09:18:30,584 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:18:30,584 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:18:30,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:18:30,584 INFO L85 PathProgramCache]: Analyzing trace with hash 1453117287, now seen corresponding path program 10 times [2021-11-09 09:18:30,584 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:18:30,584 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18116378] [2021-11-09 09:18:30,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:18:30,585 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:18:30,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:18:30,919 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 0 proven. 88 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-11-09 09:18:30,919 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:18:30,920 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18116378] [2021-11-09 09:18:30,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [18116378] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:18:30,920 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [269511132] [2021-11-09 09:18:30,920 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-09 09:18:30,920 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:18:30,920 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:18:30,921 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:18:30,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2021-11-09 09:18:32,045 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-09 09:18:32,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:18:32,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-09 09:18:32,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:18:32,218 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 0 proven. 88 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-11-09 09:18:32,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [269511132] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:18:32,218 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:18:32,218 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2021-11-09 09:18:32,218 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444133648] [2021-11-09 09:18:32,218 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-09 09:18:32,218 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:18:32,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-09 09:18:32,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=376, Unknown=0, NotChecked=0, Total=420 [2021-11-09 09:18:32,219 INFO L87 Difference]: Start difference. First operand 1285 states and 1693 transitions. Second operand has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:18:32,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:18:32,968 INFO L93 Difference]: Finished difference Result 1556 states and 1994 transitions. [2021-11-09 09:18:32,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-09 09:18:32,969 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-09 09:18:32,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:18:32,970 INFO L225 Difference]: With dead ends: 1556 [2021-11-09 09:18:32,970 INFO L226 Difference]: Without dead ends: 1528 [2021-11-09 09:18:32,970 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=119, Invalid=1141, Unknown=0, NotChecked=0, Total=1260 [2021-11-09 09:18:32,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1528 states. [2021-11-09 09:18:33,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1528 to 1285. [2021-11-09 09:18:33,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1285 states, 1284 states have (on average 1.3177570093457944) internal successors, (1692), 1284 states have internal predecessors, (1692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:18:33,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1285 states to 1285 states and 1692 transitions. [2021-11-09 09:18:33,016 INFO L78 Accepts]: Start accepts. Automaton has 1285 states and 1692 transitions. Word has length 48 [2021-11-09 09:18:33,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:18:33,017 INFO L470 AbstractCegarLoop]: Abstraction has 1285 states and 1692 transitions. [2021-11-09 09:18:33,017 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:18:33,017 INFO L276 IsEmpty]: Start isEmpty. Operand 1285 states and 1692 transitions. [2021-11-09 09:18:33,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-09 09:18:33,019 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:18:33,019 INFO L513 BasicCegarLoop]: trace histogram [12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:18:33,042 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Ended with exit code 0 [2021-11-09 09:18:33,219 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:18:33,219 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:18:33,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:18:33,220 INFO L85 PathProgramCache]: Analyzing trace with hash -174381209, now seen corresponding path program 13 times [2021-11-09 09:18:33,220 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:18:33,220 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [10400577] [2021-11-09 09:18:33,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:18:33,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:18:33,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:18:33,868 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:18:33,869 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:18:33,869 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [10400577] [2021-11-09 09:18:33,869 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [10400577] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:18:33,869 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [538087771] [2021-11-09 09:18:33,869 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-09 09:18:33,869 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:18:33,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:18:33,870 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:18:33,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e21353fc-8fe5-44af-9040-6cf19bdea080/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-09 09:18:34,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:18:34,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-09 09:18:34,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:18:35,547 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 12 proven. 144 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-09 09:18:35,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [538087771] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:18:35,547 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:18:35,547 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 15] total 42 [2021-11-09 09:18:35,547 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023895946] [2021-11-09 09:18:35,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-09 09:18:35,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:18:35,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-09 09:18:35,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=1640, Unknown=0, NotChecked=0, Total=1722 [2021-11-09 09:18:35,548 INFO L87 Difference]: Start difference. First operand 1285 states and 1692 transitions. Second operand has 42 states, 42 states have (on average 1.9047619047619047) internal successors, (80), 42 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)