./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/config/AutomizerReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0 --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 9040b900faf23bbe274a78992b583d0e69cb8306e352833058a15642ef75b25a --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-22 16:06:30,704 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-22 16:06:30,708 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-22 16:06:30,748 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-22 16:06:30,748 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-22 16:06:30,750 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-22 16:06:30,752 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-22 16:06:30,754 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-22 16:06:30,756 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-22 16:06:30,758 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-22 16:06:30,759 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-22 16:06:30,761 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-22 16:06:30,761 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-22 16:06:30,763 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-22 16:06:30,764 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-22 16:06:30,766 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-22 16:06:30,767 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-22 16:06:30,769 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-22 16:06:30,771 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-22 16:06:30,773 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-22 16:06:30,775 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-22 16:06:30,777 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-22 16:06:30,779 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-22 16:06:30,780 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-22 16:06:30,784 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-22 16:06:30,784 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-22 16:06:30,785 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-22 16:06:30,786 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-22 16:06:30,786 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-22 16:06:30,788 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-22 16:06:30,788 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-22 16:06:30,789 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-22 16:06:30,790 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-22 16:06:30,791 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-22 16:06:30,793 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-22 16:06:30,793 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-22 16:06:30,794 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-22 16:06:30,794 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-22 16:06:30,795 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-22 16:06:30,796 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-22 16:06:30,797 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-22 16:06:30,798 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-22 16:06:30,825 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-22 16:06:30,826 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-22 16:06:30,827 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-22 16:06:30,827 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-22 16:06:30,828 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-22 16:06:30,828 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-22 16:06:30,829 INFO L138 SettingsManager]: * Use SBE=true [2021-11-22 16:06:30,829 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-22 16:06:30,829 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-22 16:06:30,829 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-22 16:06:30,830 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-22 16:06:30,830 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-22 16:06:30,830 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-22 16:06:30,830 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-22 16:06:30,831 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-22 16:06:30,831 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-22 16:06:30,831 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-22 16:06:30,831 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-22 16:06:30,832 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-22 16:06:30,832 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-22 16:06:30,833 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-22 16:06:30,833 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-22 16:06:30,833 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-22 16:06:30,834 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-22 16:06:30,834 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-22 16:06:30,834 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-22 16:06:30,834 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-22 16:06:30,835 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-22 16:06:30,835 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-22 16:06:30,835 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-22 16:06:30,835 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-22 16:06:30,835 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-22 16:06:30,836 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_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9040b900faf23bbe274a78992b583d0e69cb8306e352833058a15642ef75b25a [2021-11-22 16:06:31,061 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-22 16:06:31,088 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-22 16:06:31,091 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-22 16:06:31,092 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-22 16:06:31,093 INFO L275 PluginConnector]: CDTParser initialized [2021-11-22 16:06:31,094 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/../../sv-benchmarks/c/array-crafted/zero_sum2.c [2021-11-22 16:06:31,178 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/data/ad8d44977/1b6b4908e5c5447c84313f1732bc4d01/FLAG1c9fbbea0 [2021-11-22 16:06:31,652 INFO L306 CDTParser]: Found 1 translation units. [2021-11-22 16:06:31,654 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/sv-benchmarks/c/array-crafted/zero_sum2.c [2021-11-22 16:06:31,671 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/data/ad8d44977/1b6b4908e5c5447c84313f1732bc4d01/FLAG1c9fbbea0 [2021-11-22 16:06:32,027 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/data/ad8d44977/1b6b4908e5c5447c84313f1732bc4d01 [2021-11-22 16:06:32,029 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-22 16:06:32,031 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-22 16:06:32,032 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-22 16:06:32,032 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-22 16:06:32,036 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-22 16:06:32,036 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 04:06:32" (1/1) ... [2021-11-22 16:06:32,038 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ad205a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:06:32, skipping insertion in model container [2021-11-22 16:06:32,038 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 04:06:32" (1/1) ... [2021-11-22 16:06:32,045 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-22 16:06:32,059 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-22 16:06:32,239 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/sv-benchmarks/c/array-crafted/zero_sum2.c[400,413] [2021-11-22 16:06:32,254 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-22 16:06:32,260 INFO L203 MainTranslator]: Completed pre-run [2021-11-22 16:06:32,273 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/sv-benchmarks/c/array-crafted/zero_sum2.c[400,413] [2021-11-22 16:06:32,281 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-22 16:06:32,294 INFO L208 MainTranslator]: Completed translation [2021-11-22 16:06:32,294 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:06:32 WrapperNode [2021-11-22 16:06:32,295 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-22 16:06:32,296 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-22 16:06:32,296 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-22 16:06:32,296 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-22 16:06:32,304 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:06:32" (1/1) ... [2021-11-22 16:06:32,310 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:06:32" (1/1) ... [2021-11-22 16:06:32,329 INFO L137 Inliner]: procedures = 15, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 83 [2021-11-22 16:06:32,329 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-22 16:06:32,330 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-22 16:06:32,330 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-22 16:06:32,330 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-22 16:06:32,339 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:06:32" (1/1) ... [2021-11-22 16:06:32,339 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:06:32" (1/1) ... [2021-11-22 16:06:32,341 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:06:32" (1/1) ... [2021-11-22 16:06:32,341 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:06:32" (1/1) ... [2021-11-22 16:06:32,347 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:06:32" (1/1) ... [2021-11-22 16:06:32,351 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:06:32" (1/1) ... [2021-11-22 16:06:32,353 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:06:32" (1/1) ... [2021-11-22 16:06:32,355 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-22 16:06:32,356 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-22 16:06:32,356 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-22 16:06:32,356 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-22 16:06:32,357 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:06:32" (1/1) ... [2021-11-22 16:06:32,364 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-22 16:06:32,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:06:32,389 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-22 16:06:32,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-22 16:06:32,434 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-22 16:06:32,434 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-22 16:06:32,434 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-22 16:06:32,435 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-22 16:06:32,435 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-22 16:06:32,435 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-22 16:06:32,435 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-22 16:06:32,435 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-22 16:06:32,492 INFO L236 CfgBuilder]: Building ICFG [2021-11-22 16:06:32,494 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-22 16:06:32,657 INFO L277 CfgBuilder]: Performing block encoding [2021-11-22 16:06:32,663 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-22 16:06:32,663 INFO L301 CfgBuilder]: Removed 5 assume(true) statements. [2021-11-22 16:06:32,665 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 04:06:32 BoogieIcfgContainer [2021-11-22 16:06:32,666 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-22 16:06:32,667 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-22 16:06:32,667 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-22 16:06:32,671 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-22 16:06:32,672 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 04:06:32" (1/3) ... [2021-11-22 16:06:32,672 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55a2a374 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 04:06:32, skipping insertion in model container [2021-11-22 16:06:32,673 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:06:32" (2/3) ... [2021-11-22 16:06:32,673 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55a2a374 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 04:06:32, skipping insertion in model container [2021-11-22 16:06:32,673 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 04:06:32" (3/3) ... [2021-11-22 16:06:32,675 INFO L111 eAbstractionObserver]: Analyzing ICFG zero_sum2.c [2021-11-22 16:06:32,680 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-22 16:06:32,680 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-22 16:06:32,735 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-22 16:06:32,742 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 [2021-11-22 16:06:32,743 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-22 16:06:32,759 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 24 states have (on average 1.5416666666666667) 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) [2021-11-22 16:06:32,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-22 16:06:32,765 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:06:32,766 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:06:32,767 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:06:32,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:06:32,773 INFO L85 PathProgramCache]: Analyzing trace with hash -1122046426, now seen corresponding path program 1 times [2021-11-22 16:06:32,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:06:32,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1354022456] [2021-11-22 16:06:32,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:06:32,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:06:32,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:06:33,019 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 16:06:33,019 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:06:33,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1354022456] [2021-11-22 16:06:33,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1354022456] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-22 16:06:33,021 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-22 16:06:33,021 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-22 16:06:33,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614637277] [2021-11-22 16:06:33,024 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-22 16:06:33,028 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-22 16:06:33,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:06:33,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-22 16:06:33,058 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-22 16:06:33,060 INFO L87 Difference]: Start difference. First operand has 26 states, 24 states have (on average 1.5416666666666667) 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) Second operand has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 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) [2021-11-22 16:06:33,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:06:33,077 INFO L93 Difference]: Finished difference Result 47 states and 66 transitions. [2021-11-22 16:06:33,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-22 16:06:33,079 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 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 15 [2021-11-22 16:06:33,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:06:33,087 INFO L225 Difference]: With dead ends: 47 [2021-11-22 16:06:33,087 INFO L226 Difference]: Without dead ends: 21 [2021-11-22 16:06:33,090 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-22 16:06:33,095 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-22 16:06:33,096 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-22 16:06:33,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-22 16:06:33,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-22 16:06:33,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.25) internal successors, (25), 20 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) [2021-11-22 16:06:33,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-11-22 16:06:33,129 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 15 [2021-11-22 16:06:33,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:06:33,130 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-11-22 16:06:33,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 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) [2021-11-22 16:06:33,130 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-11-22 16:06:33,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-22 16:06:33,131 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:06:33,131 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:06:33,132 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-22 16:06:33,132 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:06:33,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:06:33,133 INFO L85 PathProgramCache]: Analyzing trace with hash -1896542740, now seen corresponding path program 1 times [2021-11-22 16:06:33,133 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:06:33,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165701674] [2021-11-22 16:06:33,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:06:33,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:06:33,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:06:33,278 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 16:06:33,278 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:06:33,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165701674] [2021-11-22 16:06:33,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165701674] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-22 16:06:33,279 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-22 16:06:33,279 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-22 16:06:33,280 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527731052] [2021-11-22 16:06:33,280 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-22 16:06:33,281 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-22 16:06:33,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:06:33,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-22 16:06:33,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-22 16:06:33,299 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 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) [2021-11-22 16:06:33,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:06:33,331 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2021-11-22 16:06:33,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-22 16:06:33,331 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 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 15 [2021-11-22 16:06:33,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:06:33,332 INFO L225 Difference]: With dead ends: 39 [2021-11-22 16:06:33,333 INFO L226 Difference]: Without dead ends: 23 [2021-11-22 16:06:33,333 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-22 16:06:33,335 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-22 16:06:33,336 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 34 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-22 16:06:33,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-22 16:06:33,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-11-22 16:06:33,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 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) [2021-11-22 16:06:33,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2021-11-22 16:06:33,342 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 15 [2021-11-22 16:06:33,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:06:33,342 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2021-11-22 16:06:33,343 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 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) [2021-11-22 16:06:33,343 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2021-11-22 16:06:33,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-22 16:06:33,344 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:06:33,344 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:06:33,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-22 16:06:33,345 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:06:33,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:06:33,346 INFO L85 PathProgramCache]: Analyzing trace with hash -66597874, now seen corresponding path program 1 times [2021-11-22 16:06:33,346 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:06:33,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [708332207] [2021-11-22 16:06:33,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:06:33,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:06:33,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:06:33,449 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 16:06:33,449 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:06:33,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [708332207] [2021-11-22 16:06:33,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [708332207] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-22 16:06:33,450 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-22 16:06:33,450 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-22 16:06:33,450 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040418480] [2021-11-22 16:06:33,451 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-22 16:06:33,451 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-22 16:06:33,451 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:06:33,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-22 16:06:33,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-22 16:06:33,452 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 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) [2021-11-22 16:06:33,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:06:33,555 INFO L93 Difference]: Finished difference Result 43 states and 53 transitions. [2021-11-22 16:06:33,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-22 16:06:33,556 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 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 17 [2021-11-22 16:06:33,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:06:33,558 INFO L225 Difference]: With dead ends: 43 [2021-11-22 16:06:33,558 INFO L226 Difference]: Without dead ends: 30 [2021-11-22 16:06:33,559 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-22 16:06:33,563 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 20 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-22 16:06:33,564 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 15 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-22 16:06:33,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-22 16:06:33,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 26. [2021-11-22 16:06:33,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.2) internal successors, (30), 25 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) [2021-11-22 16:06:33,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-11-22 16:06:33,570 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 17 [2021-11-22 16:06:33,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:06:33,571 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-11-22 16:06:33,571 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 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) [2021-11-22 16:06:33,571 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-11-22 16:06:33,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-22 16:06:33,579 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:06:33,579 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:06:33,579 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-22 16:06:33,579 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:06:33,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:06:33,580 INFO L85 PathProgramCache]: Analyzing trace with hash -2060422634, now seen corresponding path program 1 times [2021-11-22 16:06:33,581 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:06:33,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [276230946] [2021-11-22 16:06:33,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:06:33,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:06:33,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:06:33,699 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-22 16:06:33,700 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:06:33,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [276230946] [2021-11-22 16:06:33,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [276230946] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:06:33,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1779849132] [2021-11-22 16:06:33,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:06:33,702 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:06:33,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:06:33,709 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:06:33,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-22 16:06:33,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:06:33,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-22 16:06:33,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:06:34,002 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-22 16:06:34,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:06:34,104 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-22 16:06:34,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1779849132] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:06:34,104 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:06:34,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-22 16:06:34,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007236932] [2021-11-22 16:06:34,105 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:06:34,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-22 16:06:34,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:06:34,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-22 16:06:34,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2021-11-22 16:06:34,107 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 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) [2021-11-22 16:06:34,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:06:34,159 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2021-11-22 16:06:34,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-22 16:06:34,160 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 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 25 [2021-11-22 16:06:34,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:06:34,164 INFO L225 Difference]: With dead ends: 49 [2021-11-22 16:06:34,164 INFO L226 Difference]: Without dead ends: 29 [2021-11-22 16:06:34,165 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2021-11-22 16:06:34,173 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 4 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-22 16:06:34,174 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 45 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-22 16:06:34,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-22 16:06:34,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2021-11-22 16:06:34,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 27 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) [2021-11-22 16:06:34,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2021-11-22 16:06:34,179 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 25 [2021-11-22 16:06:34,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:06:34,182 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2021-11-22 16:06:34,183 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 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) [2021-11-22 16:06:34,183 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2021-11-22 16:06:34,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-22 16:06:34,184 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:06:34,184 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:06:34,224 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-22 16:06:34,400 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:06:34,401 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:06:34,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:06:34,401 INFO L85 PathProgramCache]: Analyzing trace with hash -959615560, now seen corresponding path program 2 times [2021-11-22 16:06:34,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:06:34,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913005306] [2021-11-22 16:06:34,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:06:34,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:06:34,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:06:34,464 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-22 16:06:34,464 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:06:34,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913005306] [2021-11-22 16:06:34,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [913005306] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:06:34,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1911981369] [2021-11-22 16:06:34,465 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-22 16:06:34,465 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:06:34,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:06:34,466 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:06:34,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-22 16:06:34,522 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-22 16:06:34,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:06:34,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-22 16:06:34,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:06:34,619 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-22 16:06:34,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:06:34,717 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-22 16:06:34,718 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1911981369] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:06:34,718 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:06:34,718 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-22 16:06:34,719 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899567303] [2021-11-22 16:06:34,720 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:06:34,721 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-22 16:06:34,722 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:06:34,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-22 16:06:34,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2021-11-22 16:06:34,735 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 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) [2021-11-22 16:06:34,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:06:34,832 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2021-11-22 16:06:34,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-22 16:06:34,833 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 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 27 [2021-11-22 16:06:34,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:06:34,836 INFO L225 Difference]: With dead ends: 56 [2021-11-22 16:06:34,836 INFO L226 Difference]: Without dead ends: 40 [2021-11-22 16:06:34,838 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=40, Unknown=0, NotChecked=0, Total=72 [2021-11-22 16:06:34,840 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 33 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-22 16:06:34,841 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 15 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-22 16:06:34,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-22 16:06:34,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 36. [2021-11-22 16:06:34,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 35 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) [2021-11-22 16:06:34,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2021-11-22 16:06:34,852 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 27 [2021-11-22 16:06:34,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:06:34,852 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2021-11-22 16:06:34,852 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 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) [2021-11-22 16:06:34,853 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2021-11-22 16:06:34,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-22 16:06:34,853 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:06:34,854 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:06:34,879 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-22 16:06:35,076 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:06:35,077 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:06:35,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:06:35,078 INFO L85 PathProgramCache]: Analyzing trace with hash -2048824896, now seen corresponding path program 3 times [2021-11-22 16:06:35,078 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:06:35,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913884973] [2021-11-22 16:06:35,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:06:35,078 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:06:35,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:06:36,164 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 16:06:36,164 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:06:36,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913884973] [2021-11-22 16:06:36,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1913884973] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:06:36,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1498848196] [2021-11-22 16:06:36,164 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-22 16:06:36,165 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:06:36,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:06:36,168 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:06:36,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-22 16:06:36,226 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-22 16:06:36,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:06:36,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-22 16:06:36,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:06:36,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-22 16:06:37,635 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-22 16:06:37,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 26 [2021-11-22 16:06:37,904 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 16:06:37,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:06:43,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 89 treesize of output 81 [2021-11-22 16:06:43,085 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-22 16:06:43,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 263 treesize of output 231 [2021-11-22 16:06:43,550 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 16:06:43,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1498848196] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:06:43,552 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:06:43,552 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21, 25] total 55 [2021-11-22 16:06:43,552 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379716306] [2021-11-22 16:06:43,552 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:06:43,554 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-22 16:06:43,554 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:06:43,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-22 16:06:43,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=2662, Unknown=0, NotChecked=0, Total=2970 [2021-11-22 16:06:43,561 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand has 55 states, 55 states have (on average 1.7636363636363637) internal successors, (97), 55 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:06:45,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:06:45,983 INFO L93 Difference]: Finished difference Result 99 states and 114 transitions. [2021-11-22 16:06:45,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-22 16:06:45,984 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.7636363636363637) internal successors, (97), 55 states have internal predecessors, (97), 0 states have call successors, (0), 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 [2021-11-22 16:06:45,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:06:45,986 INFO L225 Difference]: With dead ends: 99 [2021-11-22 16:06:45,986 INFO L226 Difference]: Without dead ends: 94 [2021-11-22 16:06:45,990 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 31 SyntacticMatches, 16 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2243 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=787, Invalid=6353, Unknown=0, NotChecked=0, Total=7140 [2021-11-22 16:06:45,991 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 38 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 680 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 393 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 16:06:45,991 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 124 Invalid, 680 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 264 Invalid, 0 Unknown, 393 Unchecked, 0.2s Time] [2021-11-22 16:06:45,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-22 16:06:46,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 65. [2021-11-22 16:06:46,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.1875) internal successors, (76), 64 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) [2021-11-22 16:06:46,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 76 transitions. [2021-11-22 16:06:46,003 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 76 transitions. Word has length 35 [2021-11-22 16:06:46,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:06:46,004 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 76 transitions. [2021-11-22 16:06:46,004 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.7636363636363637) internal successors, (97), 55 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:06:46,004 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 76 transitions. [2021-11-22 16:06:46,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-22 16:06:46,006 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:06:46,006 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:06:46,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-22 16:06:46,220 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-22 16:06:46,220 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:06:46,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:06:46,221 INFO L85 PathProgramCache]: Analyzing trace with hash -1772469278, now seen corresponding path program 4 times [2021-11-22 16:06:46,221 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:06:46,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [243844807] [2021-11-22 16:06:46,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:06:46,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:06:46,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:06:46,319 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-22 16:06:46,319 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:06:46,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [243844807] [2021-11-22 16:06:46,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [243844807] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:06:46,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [812087284] [2021-11-22 16:06:46,320 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-22 16:06:46,320 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:06:46,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:06:46,321 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:06:46,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-22 16:06:46,371 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-22 16:06:46,371 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:06:46,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-22 16:06:46,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:06:46,492 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-22 16:06:46,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:06:46,578 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-22 16:06:46,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [812087284] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:06:46,583 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:06:46,584 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-22 16:06:46,584 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102432769] [2021-11-22 16:06:46,584 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:06:46,585 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-22 16:06:46,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:06:46,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-22 16:06:46,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2021-11-22 16:06:46,587 INFO L87 Difference]: Start difference. First operand 65 states and 76 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 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) [2021-11-22 16:06:46,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:06:46,753 INFO L93 Difference]: Finished difference Result 113 states and 130 transitions. [2021-11-22 16:06:46,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-22 16:06:46,754 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 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 37 [2021-11-22 16:06:46,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:06:46,755 INFO L225 Difference]: With dead ends: 113 [2021-11-22 16:06:46,755 INFO L226 Difference]: Without dead ends: 65 [2021-11-22 16:06:46,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=224, Unknown=0, NotChecked=0, Total=306 [2021-11-22 16:06:46,756 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 46 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 181 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 181 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-22 16:06:46,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 72 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 181 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-22 16:06:46,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-22 16:06:46,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-11-22 16:06:46,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.171875) internal successors, (75), 64 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:06:46,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 75 transitions. [2021-11-22 16:06:46,766 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 75 transitions. Word has length 37 [2021-11-22 16:06:46,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:06:46,766 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 75 transitions. [2021-11-22 16:06:46,767 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 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) [2021-11-22 16:06:46,767 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 75 transitions. [2021-11-22 16:06:46,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-22 16:06:46,768 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:06:46,768 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:06:46,806 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-22 16:06:46,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:06:46,984 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:06:46,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:06:46,985 INFO L85 PathProgramCache]: Analyzing trace with hash -1270817660, now seen corresponding path program 5 times [2021-11-22 16:06:46,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:06:46,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1224963575] [2021-11-22 16:06:46,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:06:46,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:06:47,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:06:47,065 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-22 16:06:47,065 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:06:47,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1224963575] [2021-11-22 16:06:47,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1224963575] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:06:47,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1793092397] [2021-11-22 16:06:47,066 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-22 16:06:47,066 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:06:47,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:06:47,067 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:06:47,084 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-22 16:06:47,129 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-22 16:06:47,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:06:47,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-22 16:06:47,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:06:47,247 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-22 16:06:47,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:06:47,330 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-22 16:06:47,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1793092397] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:06:47,330 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:06:47,330 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-22 16:06:47,331 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970082217] [2021-11-22 16:06:47,331 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:06:47,331 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-22 16:06:47,331 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:06:47,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-22 16:06:47,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-22 16:06:47,332 INFO L87 Difference]: Start difference. First operand 65 states and 75 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 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) [2021-11-22 16:06:47,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:06:47,481 INFO L93 Difference]: Finished difference Result 99 states and 115 transitions. [2021-11-22 16:06:47,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-22 16:06:47,482 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 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 [2021-11-22 16:06:47,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:06:47,483 INFO L225 Difference]: With dead ends: 99 [2021-11-22 16:06:47,483 INFO L226 Difference]: Without dead ends: 62 [2021-11-22 16:06:47,484 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=237, Unknown=0, NotChecked=0, Total=342 [2021-11-22 16:06:47,484 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 111 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-22 16:06:47,485 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 26 Invalid, 188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-22 16:06:47,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-22 16:06:47,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 46. [2021-11-22 16:06:47,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.1111111111111112) internal successors, (50), 45 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:06:47,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-11-22 16:06:47,491 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 39 [2021-11-22 16:06:47,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:06:47,492 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-11-22 16:06:47,492 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 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) [2021-11-22 16:06:47,492 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-11-22 16:06:47,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-22 16:06:47,493 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:06:47,493 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:06:47,525 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-22 16:06:47,708 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:06:47,708 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:06:47,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:06:47,709 INFO L85 PathProgramCache]: Analyzing trace with hash -604138262, now seen corresponding path program 6 times [2021-11-22 16:06:47,709 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:06:47,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107762671] [2021-11-22 16:06:47,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:06:47,709 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:06:47,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:06:49,271 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 16:06:49,271 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:06:49,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2107762671] [2021-11-22 16:06:49,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2107762671] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:06:49,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1215018507] [2021-11-22 16:06:49,271 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-22 16:06:49,272 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:06:49,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:06:49,276 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:06:49,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-22 16:06:49,324 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-11-22 16:06:49,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:06:49,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-22 16:06:49,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:06:50,183 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 16:06:50,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:06:50,954 INFO L354 Elim1Store]: treesize reduction 114, result has 46.0 percent of original size [2021-11-22 16:06:50,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 53 treesize of output 108 [2021-11-22 16:06:51,237 INFO L354 Elim1Store]: treesize reduction 198, result has 6.2 percent of original size [2021-11-22 16:06:51,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 23 [2021-11-22 16:06:51,331 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-22 16:06:51,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1215018507] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:06:51,332 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:06:51,332 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 18, 16] total 55 [2021-11-22 16:06:51,332 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584435498] [2021-11-22 16:06:51,332 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:06:51,333 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-22 16:06:51,333 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:06:51,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-22 16:06:51,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=2732, Unknown=0, NotChecked=0, Total=2970 [2021-11-22 16:06:51,334 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 55 states, 55 states have (on average 1.981818181818182) internal successors, (109), 55 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:06:52,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:06:52,866 INFO L93 Difference]: Finished difference Result 81 states and 88 transitions. [2021-11-22 16:06:52,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-22 16:06:52,867 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.981818181818182) internal successors, (109), 55 states have internal predecessors, (109), 0 states have call successors, (0), 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 [2021-11-22 16:06:52,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:06:52,868 INFO L225 Difference]: With dead ends: 81 [2021-11-22 16:06:52,868 INFO L226 Difference]: Without dead ends: 77 [2021-11-22 16:06:52,869 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 60 SyntacticMatches, 12 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1809 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=444, Invalid=4526, Unknown=0, NotChecked=0, Total=4970 [2021-11-22 16:06:52,870 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 26 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 1344 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 1458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 1344 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-22 16:06:52,870 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 114 Invalid, 1458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 1344 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-22 16:06:52,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-22 16:06:52,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 67. [2021-11-22 16:06:52,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.121212121212121) internal successors, (74), 66 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:06:52,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 74 transitions. [2021-11-22 16:06:52,879 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 74 transitions. Word has length 45 [2021-11-22 16:06:52,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:06:52,879 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 74 transitions. [2021-11-22 16:06:52,879 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.981818181818182) internal successors, (109), 55 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:06:52,880 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 74 transitions. [2021-11-22 16:06:52,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-22 16:06:52,881 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:06:52,881 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:06:52,911 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-22 16:06:53,100 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-22 16:06:53,101 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:06:53,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:06:53,101 INFO L85 PathProgramCache]: Analyzing trace with hash -703050612, now seen corresponding path program 7 times [2021-11-22 16:06:53,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:06:53,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648721954] [2021-11-22 16:06:53,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:06:53,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:06:53,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:06:53,191 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-22 16:06:53,191 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:06:53,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648721954] [2021-11-22 16:06:53,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [648721954] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:06:53,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [595203652] [2021-11-22 16:06:53,192 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-22 16:06:53,192 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:06:53,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:06:53,193 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:06:53,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-22 16:06:53,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:06:53,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-22 16:06:53,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:06:53,406 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-22 16:06:53,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:06:53,493 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-22 16:06:53,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [595203652] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:06:53,494 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:06:53,494 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-22 16:06:53,494 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156230811] [2021-11-22 16:06:53,494 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:06:53,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-22 16:06:53,495 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:06:53,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-22 16:06:53,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2021-11-22 16:06:53,496 INFO L87 Difference]: Start difference. First operand 67 states and 74 transitions. Second operand has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 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) [2021-11-22 16:06:53,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:06:53,719 INFO L93 Difference]: Finished difference Result 132 states and 146 transitions. [2021-11-22 16:06:53,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-22 16:06:53,720 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 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 [2021-11-22 16:06:53,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:06:53,721 INFO L225 Difference]: With dead ends: 132 [2021-11-22 16:06:53,721 INFO L226 Difference]: Without dead ends: 70 [2021-11-22 16:06:53,722 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=118, Invalid=344, Unknown=0, NotChecked=0, Total=462 [2021-11-22 16:06:53,723 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 53 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 16:06:53,723 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 63 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-22 16:06:53,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-22 16:06:53,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2021-11-22 16:06:53,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.1176470588235294) internal successors, (76), 68 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) [2021-11-22 16:06:53,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 76 transitions. [2021-11-22 16:06:53,737 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 76 transitions. Word has length 47 [2021-11-22 16:06:53,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:06:53,738 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 76 transitions. [2021-11-22 16:06:53,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 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) [2021-11-22 16:06:53,738 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 76 transitions. [2021-11-22 16:06:53,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-22 16:06:53,739 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:06:53,740 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:06:53,764 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-22 16:06:53,948 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-22 16:06:53,948 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:06:53,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:06:53,949 INFO L85 PathProgramCache]: Analyzing trace with hash 1331298990, now seen corresponding path program 8 times [2021-11-22 16:06:53,949 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:06:53,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [402144340] [2021-11-22 16:06:53,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:06:53,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:06:53,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:06:54,028 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-22 16:06:54,029 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:06:54,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [402144340] [2021-11-22 16:06:54,029 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [402144340] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:06:54,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1618725802] [2021-11-22 16:06:54,030 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-22 16:06:54,030 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:06:54,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:06:54,031 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:06:54,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-22 16:06:54,089 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-22 16:06:54,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:06:54,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-22 16:06:54,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:06:54,272 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-22 16:06:54,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:06:54,385 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-22 16:06:54,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1618725802] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:06:54,385 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:06:54,385 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-22 16:06:54,386 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960476344] [2021-11-22 16:06:54,386 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:06:54,386 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-22 16:06:54,386 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:06:54,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-22 16:06:54,387 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2021-11-22 16:06:54,387 INFO L87 Difference]: Start difference. First operand 69 states and 76 transitions. Second operand has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 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) [2021-11-22 16:06:54,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:06:54,635 INFO L93 Difference]: Finished difference Result 101 states and 113 transitions. [2021-11-22 16:06:54,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-22 16:06:54,635 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 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 49 [2021-11-22 16:06:54,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:06:54,636 INFO L225 Difference]: With dead ends: 101 [2021-11-22 16:06:54,636 INFO L226 Difference]: Without dead ends: 60 [2021-11-22 16:06:54,637 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=152, Invalid=354, Unknown=0, NotChecked=0, Total=506 [2021-11-22 16:06:54,637 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 162 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 16:06:54,638 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [162 Valid, 37 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-22 16:06:54,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-22 16:06:54,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2021-11-22 16:06:54,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 55 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) [2021-11-22 16:06:54,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2021-11-22 16:06:54,645 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 49 [2021-11-22 16:06:54,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:06:54,646 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2021-11-22 16:06:54,646 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 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) [2021-11-22 16:06:54,646 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2021-11-22 16:06:54,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-22 16:06:54,648 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:06:54,648 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:06:54,686 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-22 16:06:54,864 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:06:54,864 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:06:54,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:06:54,865 INFO L85 PathProgramCache]: Analyzing trace with hash -2047700076, now seen corresponding path program 9 times [2021-11-22 16:06:54,865 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:06:54,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1490224716] [2021-11-22 16:06:54,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:06:54,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:06:54,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:06:57,184 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 16:06:57,185 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:06:57,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1490224716] [2021-11-22 16:06:57,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1490224716] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:06:57,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1497314609] [2021-11-22 16:06:57,185 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-22 16:06:57,185 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:06:57,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:06:57,204 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:06:57,204 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-22 16:06:57,254 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-22 16:06:57,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:06:57,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 81 conjunts are in the unsatisfiable core [2021-11-22 16:06:57,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:06:57,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-22 16:07:01,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:07:01,580 INFO L354 Elim1Store]: treesize reduction 184, result has 44.1 percent of original size [2021-11-22 16:07:01,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 2 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 141 treesize of output 185 [2021-11-22 16:07:02,702 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 7 proven. 64 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-22 16:07:02,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:07:08,657 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-22 16:07:08,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1497314609] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:07:08,657 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:07:08,657 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 26, 23] total 83 [2021-11-22 16:07:08,658 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246169408] [2021-11-22 16:07:08,658 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:07:08,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-22 16:07:08,659 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:07:08,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-22 16:07:08,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=6368, Unknown=0, NotChecked=0, Total=6806 [2021-11-22 16:07:08,662 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand has 83 states, 83 states have (on average 1.7590361445783131) internal successors, (146), 83 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:07:14,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:07:14,330 INFO L93 Difference]: Finished difference Result 93 states and 100 transitions. [2021-11-22 16:07:14,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-22 16:07:14,333 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 1.7590361445783131) internal successors, (146), 83 states have internal predecessors, (146), 0 states have call successors, (0), 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 55 [2021-11-22 16:07:14,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:07:14,334 INFO L225 Difference]: With dead ends: 93 [2021-11-22 16:07:14,334 INFO L226 Difference]: Without dead ends: 89 [2021-11-22 16:07:14,338 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 56 SyntacticMatches, 16 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4392 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=1072, Invalid=15184, Unknown=0, NotChecked=0, Total=16256 [2021-11-22 16:07:14,339 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 67 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 687 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 1435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 687 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 655 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-22 16:07:14,339 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 134 Invalid, 1435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 687 Invalid, 0 Unknown, 655 Unchecked, 0.5s Time] [2021-11-22 16:07:14,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-22 16:07:14,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 81. [2021-11-22 16:07:14,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 80 states have (on average 1.1) internal successors, (88), 80 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:07:14,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 88 transitions. [2021-11-22 16:07:14,352 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 88 transitions. Word has length 55 [2021-11-22 16:07:14,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:07:14,352 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 88 transitions. [2021-11-22 16:07:14,353 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 1.7590361445783131) internal successors, (146), 83 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:07:14,353 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 88 transitions. [2021-11-22 16:07:14,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-22 16:07:14,354 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:07:14,354 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:07:14,377 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-22 16:07:14,559 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-22 16:07:14,559 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:07:14,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:07:14,560 INFO L85 PathProgramCache]: Analyzing trace with hash -691517258, now seen corresponding path program 10 times [2021-11-22 16:07:14,560 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:07:14,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [850155981] [2021-11-22 16:07:14,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:07:14,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:07:14,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:07:14,662 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 18 proven. 23 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-22 16:07:14,662 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:07:14,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [850155981] [2021-11-22 16:07:14,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [850155981] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:07:14,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2021896493] [2021-11-22 16:07:14,663 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-22 16:07:14,663 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:07:14,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:07:14,664 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:07:14,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-22 16:07:14,724 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-22 16:07:14,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:07:14,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-22 16:07:14,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:07:14,926 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 25 proven. 16 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-22 16:07:14,926 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:07:15,024 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 25 proven. 16 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-22 16:07:15,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2021896493] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:07:15,024 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:07:15,024 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-22 16:07:15,024 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595554712] [2021-11-22 16:07:15,024 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:07:15,025 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-22 16:07:15,025 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:07:15,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-22 16:07:15,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2021-11-22 16:07:15,025 INFO L87 Difference]: Start difference. First operand 81 states and 88 transitions. Second operand has 20 states, 20 states have (on average 2.75) internal successors, (55), 20 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:07:15,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:07:15,278 INFO L93 Difference]: Finished difference Result 160 states and 174 transitions. [2021-11-22 16:07:15,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-22 16:07:15,279 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.75) internal successors, (55), 20 states have internal predecessors, (55), 0 states have call successors, (0), 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 57 [2021-11-22 16:07:15,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:07:15,280 INFO L225 Difference]: With dead ends: 160 [2021-11-22 16:07:15,280 INFO L226 Difference]: Without dead ends: 84 [2021-11-22 16:07:15,281 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=489, Unknown=0, NotChecked=0, Total=650 [2021-11-22 16:07:15,281 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 66 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 16:07:15,282 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 57 Invalid, 362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-22 16:07:15,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-22 16:07:15,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2021-11-22 16:07:15,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.0975609756097562) internal successors, (90), 82 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:07:15,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 90 transitions. [2021-11-22 16:07:15,305 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 90 transitions. Word has length 57 [2021-11-22 16:07:15,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:07:15,306 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 90 transitions. [2021-11-22 16:07:15,306 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.75) internal successors, (55), 20 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:07:15,306 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 90 transitions. [2021-11-22 16:07:15,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-22 16:07:15,313 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:07:15,314 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:07:15,345 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-22 16:07:15,532 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-22 16:07:15,532 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:07:15,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:07:15,533 INFO L85 PathProgramCache]: Analyzing trace with hash -801227688, now seen corresponding path program 11 times [2021-11-22 16:07:15,533 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:07:15,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1162852004] [2021-11-22 16:07:15,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:07:15,533 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:07:15,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:07:15,669 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 9 proven. 32 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-22 16:07:15,669 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:07:15,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1162852004] [2021-11-22 16:07:15,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1162852004] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:07:15,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1743480772] [2021-11-22 16:07:15,670 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-22 16:07:15,670 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:07:15,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:07:15,672 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:07:15,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-22 16:07:15,830 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-22 16:07:15,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:07:15,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-22 16:07:15,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:07:16,015 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 16 proven. 25 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-22 16:07:16,016 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:07:16,121 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 16 proven. 25 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-22 16:07:16,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1743480772] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:07:16,122 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:07:16,122 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-22 16:07:16,122 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875480603] [2021-11-22 16:07:16,122 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:07:16,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-22 16:07:16,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:07:16,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-22 16:07:16,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=281, Unknown=0, NotChecked=0, Total=380 [2021-11-22 16:07:16,124 INFO L87 Difference]: Start difference. First operand 83 states and 90 transitions. Second operand has 20 states, 20 states have (on average 3.3) internal successors, (66), 20 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:07:16,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:07:16,341 INFO L93 Difference]: Finished difference Result 119 states and 131 transitions. [2021-11-22 16:07:16,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-22 16:07:16,342 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.3) internal successors, (66), 20 states have internal predecessors, (66), 0 states have call successors, (0), 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 59 [2021-11-22 16:07:16,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:07:16,342 INFO L225 Difference]: With dead ends: 119 [2021-11-22 16:07:16,343 INFO L226 Difference]: Without dead ends: 70 [2021-11-22 16:07:16,344 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 109 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2021-11-22 16:07:16,345 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 119 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 16:07:16,345 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [119 Valid, 29 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-22 16:07:16,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-22 16:07:16,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 66. [2021-11-22 16:07:16,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 65 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:07:16,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2021-11-22 16:07:16,352 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 59 [2021-11-22 16:07:16,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:07:16,353 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2021-11-22 16:07:16,353 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.3) internal successors, (66), 20 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:07:16,353 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2021-11-22 16:07:16,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-22 16:07:16,354 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:07:16,354 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:07:16,379 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-22 16:07:16,568 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:07:16,568 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:07:16,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:07:16,569 INFO L85 PathProgramCache]: Analyzing trace with hash -1079638594, now seen corresponding path program 12 times [2021-11-22 16:07:16,569 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:07:16,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922384900] [2021-11-22 16:07:16,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:07:16,569 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:07:16,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:07:19,453 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 125 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 16:07:19,454 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:07:19,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922384900] [2021-11-22 16:07:19,454 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922384900] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:07:19,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2004348198] [2021-11-22 16:07:19,454 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-22 16:07:19,454 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:07:19,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:07:19,455 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:07:19,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-22 16:07:19,516 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-11-22 16:07:19,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:07:19,518 WARN L261 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 103 conjunts are in the unsatisfiable core [2021-11-22 16:07:19,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:07:19,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-22 16:07:22,741 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-22 16:07:22,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 31 [2021-11-22 16:07:23,079 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 3 proven. 121 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 16:07:23,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:07:31,024 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 109 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-22 16:07:31,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2004348198] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:07:31,024 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:07:31,024 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 33, 27] total 101 [2021-11-22 16:07:31,025 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457211116] [2021-11-22 16:07:31,025 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:07:31,026 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2021-11-22 16:07:31,026 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:07:31,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2021-11-22 16:07:31,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=629, Invalid=9471, Unknown=0, NotChecked=0, Total=10100 [2021-11-22 16:07:31,031 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand has 101 states, 101 states have (on average 1.7128712871287128) internal successors, (173), 101 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:07:37,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:07:37,150 INFO L93 Difference]: Finished difference Result 109 states and 116 transitions. [2021-11-22 16:07:37,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-22 16:07:37,151 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.7128712871287128) internal successors, (173), 101 states have internal predecessors, (173), 0 states have call successors, (0), 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 65 [2021-11-22 16:07:37,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:07:37,152 INFO L225 Difference]: With dead ends: 109 [2021-11-22 16:07:37,152 INFO L226 Difference]: Without dead ends: 105 [2021-11-22 16:07:37,158 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 69 SyntacticMatches, 15 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6722 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=1348, Invalid=21302, Unknown=0, NotChecked=0, Total=22650 [2021-11-22 16:07:37,160 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 35 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 1162 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 2255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 1162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1043 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-22 16:07:37,160 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 181 Invalid, 2255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 1162 Invalid, 0 Unknown, 1043 Unchecked, 0.8s Time] [2021-11-22 16:07:37,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-22 16:07:37,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 95. [2021-11-22 16:07:37,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0851063829787233) internal successors, (102), 94 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:07:37,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 102 transitions. [2021-11-22 16:07:37,183 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 102 transitions. Word has length 65 [2021-11-22 16:07:37,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:07:37,184 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 102 transitions. [2021-11-22 16:07:37,184 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.7128712871287128) internal successors, (173), 101 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:07:37,184 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 102 transitions. [2021-11-22 16:07:37,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-22 16:07:37,185 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:07:37,185 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:07:37,205 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-22 16:07:37,385 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-22 16:07:37,386 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:07:37,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:07:37,386 INFO L85 PathProgramCache]: Analyzing trace with hash 1902631008, now seen corresponding path program 13 times [2021-11-22 16:07:37,386 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:07:37,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83158262] [2021-11-22 16:07:37,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:07:37,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:07:37,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:07:37,512 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 27 proven. 34 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-22 16:07:37,512 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:07:37,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83158262] [2021-11-22 16:07:37,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [83158262] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:07:37,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1896875726] [2021-11-22 16:07:37,513 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-22 16:07:37,513 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:07:37,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:07:37,516 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:07:37,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-22 16:07:37,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:07:37,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-22 16:07:37,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:07:37,783 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 36 proven. 25 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-22 16:07:37,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:07:37,922 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 36 proven. 25 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-22 16:07:37,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1896875726] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:07:37,922 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:07:37,922 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-22 16:07:37,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077320093] [2021-11-22 16:07:37,922 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:07:37,923 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-22 16:07:37,923 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:07:37,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-22 16:07:37,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=382, Unknown=0, NotChecked=0, Total=506 [2021-11-22 16:07:37,923 INFO L87 Difference]: Start difference. First operand 95 states and 102 transitions. Second operand has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 23 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:07:38,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:07:38,209 INFO L93 Difference]: Finished difference Result 188 states and 202 transitions. [2021-11-22 16:07:38,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-22 16:07:38,210 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 23 states have internal predecessors, (61), 0 states have call successors, (0), 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 67 [2021-11-22 16:07:38,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:07:38,211 INFO L225 Difference]: With dead ends: 188 [2021-11-22 16:07:38,211 INFO L226 Difference]: Without dead ends: 98 [2021-11-22 16:07:38,211 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=211, Invalid=659, Unknown=0, NotChecked=0, Total=870 [2021-11-22 16:07:38,212 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 64 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 424 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 424 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 16:07:38,212 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 65 Invalid, 482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 424 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-22 16:07:38,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-11-22 16:07:38,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2021-11-22 16:07:38,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.0833333333333333) internal successors, (104), 96 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:07:38,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 104 transitions. [2021-11-22 16:07:38,222 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 104 transitions. Word has length 67 [2021-11-22 16:07:38,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:07:38,222 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 104 transitions. [2021-11-22 16:07:38,222 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 23 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:07:38,222 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 104 transitions. [2021-11-22 16:07:38,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-22 16:07:38,223 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:07:38,223 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:07:38,248 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-22 16:07:38,423 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-22 16:07:38,423 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:07:38,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:07:38,424 INFO L85 PathProgramCache]: Analyzing trace with hash 721627522, now seen corresponding path program 14 times [2021-11-22 16:07:38,424 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:07:38,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [222181150] [2021-11-22 16:07:38,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:07:38,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:07:38,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:07:38,560 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-22 16:07:38,560 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:07:38,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [222181150] [2021-11-22 16:07:38,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [222181150] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:07:38,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160789753] [2021-11-22 16:07:38,561 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-22 16:07:38,561 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:07:38,561 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:07:38,562 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:07:38,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-22 16:07:38,636 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-22 16:07:38,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:07:38,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-22 16:07:38,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:07:38,875 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 25 proven. 36 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-22 16:07:38,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:07:39,039 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 25 proven. 36 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-22 16:07:39,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160789753] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:07:39,039 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:07:39,040 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-22 16:07:39,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128743637] [2021-11-22 16:07:39,040 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:07:39,040 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-22 16:07:39,041 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:07:39,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-22 16:07:39,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=377, Unknown=0, NotChecked=0, Total=506 [2021-11-22 16:07:39,042 INFO L87 Difference]: Start difference. First operand 97 states and 104 transitions. Second operand has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 23 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:07:39,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:07:39,286 INFO L93 Difference]: Finished difference Result 137 states and 149 transitions. [2021-11-22 16:07:39,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-22 16:07:39,286 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 23 states have internal predecessors, (61), 0 states have call successors, (0), 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 69 [2021-11-22 16:07:39,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:07:39,287 INFO L225 Difference]: With dead ends: 137 [2021-11-22 16:07:39,287 INFO L226 Difference]: Without dead ends: 80 [2021-11-22 16:07:39,287 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 128 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=273, Invalid=657, Unknown=0, NotChecked=0, Total=930 [2021-11-22 16:07:39,288 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 149 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 386 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 16:07:39,288 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 36 Invalid, 386 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-22 16:07:39,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-22 16:07:39,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 76. [2021-11-22 16:07:39,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 75 states have (on average 1.0666666666666667) internal successors, (80), 75 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) [2021-11-22 16:07:39,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2021-11-22 16:07:39,298 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 69 [2021-11-22 16:07:39,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:07:39,298 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2021-11-22 16:07:39,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 23 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:07:39,298 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2021-11-22 16:07:39,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-22 16:07:39,299 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:07:39,299 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:07:39,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-22 16:07:39,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-22 16:07:39,500 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:07:39,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:07:39,500 INFO L85 PathProgramCache]: Analyzing trace with hash 209029992, now seen corresponding path program 15 times [2021-11-22 16:07:39,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:07:39,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923231330] [2021-11-22 16:07:39,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:07:39,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:07:39,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:07:43,835 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 4 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 16:07:43,836 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:07:43,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923231330] [2021-11-22 16:07:43,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1923231330] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:07:43,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802274205] [2021-11-22 16:07:43,836 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-22 16:07:43,837 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:07:43,837 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:07:43,840 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:07:43,842 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-22 16:07:43,925 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-22 16:07:43,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:07:43,928 WARN L261 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 121 conjunts are in the unsatisfiable core [2021-11-22 16:07:43,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:07:44,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-22 16:07:50,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:07:50,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:07:50,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:07:51,043 INFO L354 Elim1Store]: treesize reduction 98, result has 44.6 percent of original size [2021-11-22 16:07:51,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 3 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 117 treesize of output 107 [2021-11-22 16:07:51,644 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 7 proven. 164 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-22 16:07:51,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:08:02,998 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-22 16:08:02,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [802274205] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:08:02,998 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:08:02,999 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 36, 31] total 116 [2021-11-22 16:08:02,999 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693853701] [2021-11-22 16:08:02,999 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:08:02,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 116 states [2021-11-22 16:08:02,999 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:08:03,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2021-11-22 16:08:03,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=882, Invalid=12457, Unknown=1, NotChecked=0, Total=13340 [2021-11-22 16:08:03,001 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand has 116 states, 116 states have (on average 1.6982758620689655) internal successors, (197), 116 states have internal predecessors, (197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:08:17,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:08:17,439 INFO L93 Difference]: Finished difference Result 124 states and 131 transitions. [2021-11-22 16:08:17,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-11-22 16:08:17,440 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 116 states have (on average 1.6982758620689655) internal successors, (197), 116 states have internal predecessors, (197), 0 states have call successors, (0), 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 75 [2021-11-22 16:08:17,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:08:17,441 INFO L225 Difference]: With dead ends: 124 [2021-11-22 16:08:17,441 INFO L226 Difference]: Without dead ends: 120 [2021-11-22 16:08:17,444 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 85 SyntacticMatches, 14 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8932 ImplicationChecksByTransitivity, 29.3s TimeCoverageRelationStatistics Valid=1997, Invalid=30222, Unknown=1, NotChecked=0, Total=32220 [2021-11-22 16:08:17,445 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 46 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 1493 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 2529 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 1493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 916 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-22 16:08:17,445 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 174 Invalid, 2529 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 1493 Invalid, 0 Unknown, 916 Unchecked, 1.2s Time] [2021-11-22 16:08:17,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-22 16:08:17,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 109. [2021-11-22 16:08:17,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 108 states have (on average 1.0740740740740742) internal successors, (116), 108 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:08:17,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 116 transitions. [2021-11-22 16:08:17,456 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 116 transitions. Word has length 75 [2021-11-22 16:08:17,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:08:17,456 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 116 transitions. [2021-11-22 16:08:17,457 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 116 states, 116 states have (on average 1.6982758620689655) internal successors, (197), 116 states have internal predecessors, (197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:08:17,457 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 116 transitions. [2021-11-22 16:08:17,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-22 16:08:17,458 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:08:17,458 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:08:17,481 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-22 16:08:17,664 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-22 16:08:17,664 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:08:17,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:08:17,665 INFO L85 PathProgramCache]: Analyzing trace with hash -932406390, now seen corresponding path program 16 times [2021-11-22 16:08:17,665 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:08:17,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1561018432] [2021-11-22 16:08:17,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:08:17,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:08:17,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:08:17,821 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 38 proven. 47 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-22 16:08:17,821 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:08:17,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1561018432] [2021-11-22 16:08:17,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1561018432] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:08:17,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [42178748] [2021-11-22 16:08:17,822 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-22 16:08:17,822 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:08:17,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:08:17,823 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:08:17,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-22 16:08:17,896 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-22 16:08:17,896 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:08:17,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-22 16:08:17,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:08:18,212 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 49 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-22 16:08:18,213 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:08:18,387 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 49 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-22 16:08:18,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [42178748] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:08:18,387 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:08:18,387 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-22 16:08:18,387 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608180588] [2021-11-22 16:08:18,388 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:08:18,388 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-22 16:08:18,388 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:08:18,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-22 16:08:18,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=493, Unknown=0, NotChecked=0, Total=650 [2021-11-22 16:08:18,389 INFO L87 Difference]: Start difference. First operand 109 states and 116 transitions. Second operand has 26 states, 26 states have (on average 2.576923076923077) internal successors, (67), 26 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) [2021-11-22 16:08:18,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:08:18,843 INFO L93 Difference]: Finished difference Result 216 states and 230 transitions. [2021-11-22 16:08:18,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-22 16:08:18,843 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.576923076923077) internal successors, (67), 26 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 77 [2021-11-22 16:08:18,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:08:18,844 INFO L225 Difference]: With dead ends: 216 [2021-11-22 16:08:18,845 INFO L226 Difference]: Without dead ends: 112 [2021-11-22 16:08:18,845 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=268, Invalid=854, Unknown=0, NotChecked=0, Total=1122 [2021-11-22 16:08:18,846 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 68 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 515 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 575 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 515 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-22 16:08:18,846 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 73 Invalid, 575 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 515 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-22 16:08:18,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-22 16:08:18,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2021-11-22 16:08:18,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.0727272727272728) internal successors, (118), 110 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:08:18,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 118 transitions. [2021-11-22 16:08:18,862 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 118 transitions. Word has length 77 [2021-11-22 16:08:18,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:08:18,862 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 118 transitions. [2021-11-22 16:08:18,862 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.576923076923077) internal successors, (67), 26 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) [2021-11-22 16:08:18,862 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 118 transitions. [2021-11-22 16:08:18,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-22 16:08:18,863 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:08:18,863 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:08:18,893 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-22 16:08:19,084 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:08:19,084 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:08:19,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:08:19,085 INFO L85 PathProgramCache]: Analyzing trace with hash -1623823828, now seen corresponding path program 17 times [2021-11-22 16:08:19,085 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:08:19,085 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923016343] [2021-11-22 16:08:19,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:08:19,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:08:19,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:08:19,246 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 25 proven. 60 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-22 16:08:19,246 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:08:19,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923016343] [2021-11-22 16:08:19,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1923016343] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:08:19,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697054485] [2021-11-22 16:08:19,246 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-22 16:08:19,247 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:08:19,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:08:19,248 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:08:19,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-22 16:08:19,637 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-11-22 16:08:19,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:08:19,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-22 16:08:19,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:08:19,959 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 49 proven. 36 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-22 16:08:19,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:08:20,176 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 49 proven. 36 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-22 16:08:20,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [697054485] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:08:20,177 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:08:20,177 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 39 [2021-11-22 16:08:20,177 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020983002] [2021-11-22 16:08:20,177 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:08:20,177 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-22 16:08:20,178 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:08:20,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-22 16:08:20,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1265, Unknown=0, NotChecked=0, Total=1482 [2021-11-22 16:08:20,178 INFO L87 Difference]: Start difference. First operand 111 states and 118 transitions. Second operand has 39 states, 39 states have (on average 2.58974358974359) internal successors, (101), 39 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:08:20,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:08:20,663 INFO L93 Difference]: Finished difference Result 155 states and 167 transitions. [2021-11-22 16:08:20,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-22 16:08:20,664 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.58974358974359) internal successors, (101), 39 states have internal predecessors, (101), 0 states have call successors, (0), 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 79 [2021-11-22 16:08:20,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:08:20,665 INFO L225 Difference]: With dead ends: 155 [2021-11-22 16:08:20,665 INFO L226 Difference]: Without dead ends: 90 [2021-11-22 16:08:20,666 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 584 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=408, Invalid=1944, Unknown=0, NotChecked=0, Total=2352 [2021-11-22 16:08:20,666 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 289 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 436 mSolverCounterSat, 242 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 242 IncrementalHoareTripleChecker+Valid, 436 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-22 16:08:20,667 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [289 Valid, 42 Invalid, 678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [242 Valid, 436 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-22 16:08:20,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-22 16:08:20,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 86. [2021-11-22 16:08:20,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.0588235294117647) internal successors, (90), 85 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:08:20,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 90 transitions. [2021-11-22 16:08:20,680 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 90 transitions. Word has length 79 [2021-11-22 16:08:20,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:08:20,680 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 90 transitions. [2021-11-22 16:08:20,681 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.58974358974359) internal successors, (101), 39 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:08:20,681 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 90 transitions. [2021-11-22 16:08:20,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-22 16:08:20,682 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:08:20,682 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:08:20,717 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-22 16:08:20,901 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:08:20,902 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:08:20,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:08:20,902 INFO L85 PathProgramCache]: Analyzing trace with hash -1053375342, now seen corresponding path program 18 times [2021-11-22 16:08:20,902 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:08:20,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250162728] [2021-11-22 16:08:20,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:08:20,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:08:20,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:08:26,128 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 16:08:26,128 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:08:26,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250162728] [2021-11-22 16:08:26,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250162728] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:08:26,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [836475450] [2021-11-22 16:08:26,128 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-22 16:08:26,129 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:08:26,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:08:26,130 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:08:26,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-22 16:08:26,226 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-11-22 16:08:26,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:08:26,229 WARN L261 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 134 conjunts are in the unsatisfiable core [2021-11-22 16:08:26,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:08:33,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:08:33,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:08:33,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:08:33,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:08:33,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:08:33,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:08:33,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:08:33,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:08:33,350 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:08:33,350 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:08:33,543 INFO L354 Elim1Store]: treesize reduction 332, result has 37.7 percent of original size [2021-11-22 16:08:33,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 10 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 189 treesize of output 237 [2021-11-22 16:08:34,250 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 13 proven. 196 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-22 16:08:34,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:08:47,990 INFO L354 Elim1Store]: treesize reduction 1183, result has 20.9 percent of original size [2021-11-22 16:08:47,990 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 289 treesize of output 371 [2021-11-22 16:09:03,586 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 209 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-22 16:09:03,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [836475450] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:09:03,587 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:09:03,587 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 38, 36] total 134 [2021-11-22 16:09:03,587 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468683636] [2021-11-22 16:09:03,587 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:09:03,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 134 states [2021-11-22 16:09:03,588 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:09:03,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2021-11-22 16:09:03,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=954, Invalid=16868, Unknown=0, NotChecked=0, Total=17822 [2021-11-22 16:09:03,591 INFO L87 Difference]: Start difference. First operand 86 states and 90 transitions. Second operand has 134 states, 134 states have (on average 1.671641791044776) internal successors, (224), 134 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) [2021-11-22 16:09:23,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:09:23,660 INFO L93 Difference]: Finished difference Result 141 states and 148 transitions. [2021-11-22 16:09:23,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-11-22 16:09:23,661 INFO L78 Accepts]: Start accepts. Automaton has has 134 states, 134 states have (on average 1.671641791044776) internal successors, (224), 134 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) Word has length 85 [2021-11-22 16:09:23,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:09:23,664 INFO L225 Difference]: With dead ends: 141 [2021-11-22 16:09:23,664 INFO L226 Difference]: Without dead ends: 137 [2021-11-22 16:09:23,667 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 100 SyntacticMatches, 11 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9242 ImplicationChecksByTransitivity, 38.6s TimeCoverageRelationStatistics Valid=2298, Invalid=39522, Unknown=0, NotChecked=0, Total=41820 [2021-11-22 16:09:23,668 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 65 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 1965 mSolverCounterSat, 190 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 3507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 190 IncrementalHoareTripleChecker+Valid, 1965 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1352 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-22 16:09:23,668 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 186 Invalid, 3507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [190 Valid, 1965 Invalid, 0 Unknown, 1352 Unchecked, 1.5s Time] [2021-11-22 16:09:23,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-11-22 16:09:23,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 123. [2021-11-22 16:09:23,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.0655737704918034) internal successors, (130), 122 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:09:23,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 130 transitions. [2021-11-22 16:09:23,686 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 130 transitions. Word has length 85 [2021-11-22 16:09:23,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:09:23,687 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 130 transitions. [2021-11-22 16:09:23,687 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 134 states, 134 states have (on average 1.671641791044776) internal successors, (224), 134 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) [2021-11-22 16:09:23,688 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 130 transitions. [2021-11-22 16:09:23,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-22 16:09:23,689 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:09:23,689 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:09:23,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-22 16:09:23,891 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:09:23,892 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:09:23,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:09:23,892 INFO L85 PathProgramCache]: Analyzing trace with hash 1371812404, now seen corresponding path program 19 times [2021-11-22 16:09:23,892 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:09:23,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692430735] [2021-11-22 16:09:23,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:09:23,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:09:23,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:09:24,096 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 51 proven. 62 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-22 16:09:24,096 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:09:24,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692430735] [2021-11-22 16:09:24,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1692430735] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:09:24,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726263603] [2021-11-22 16:09:24,097 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-22 16:09:24,097 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:09:24,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:09:24,098 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:09:24,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-22 16:09:24,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:09:24,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-22 16:09:24,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:09:24,613 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 64 proven. 49 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-22 16:09:24,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:09:24,842 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 64 proven. 49 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-22 16:09:24,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [726263603] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:09:24,843 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:09:24,843 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-22 16:09:24,843 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497443671] [2021-11-22 16:09:24,843 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:09:24,844 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-22 16:09:24,844 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:09:24,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-22 16:09:24,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=618, Unknown=0, NotChecked=0, Total=812 [2021-11-22 16:09:24,845 INFO L87 Difference]: Start difference. First operand 123 states and 130 transitions. Second operand has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 29 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:09:25,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:09:25,327 INFO L93 Difference]: Finished difference Result 244 states and 258 transitions. [2021-11-22 16:09:25,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-22 16:09:25,330 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 29 states have internal predecessors, (73), 0 states have call successors, (0), 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 87 [2021-11-22 16:09:25,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:09:25,331 INFO L225 Difference]: With dead ends: 244 [2021-11-22 16:09:25,331 INFO L226 Difference]: Without dead ends: 126 [2021-11-22 16:09:25,332 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=332, Invalid=1074, Unknown=0, NotChecked=0, Total=1406 [2021-11-22 16:09:25,333 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 84 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 581 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-22 16:09:25,333 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 65 Invalid, 581 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-22 16:09:25,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-22 16:09:25,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2021-11-22 16:09:25,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 124 states have (on average 1.064516129032258) internal successors, (132), 124 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:09:25,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 132 transitions. [2021-11-22 16:09:25,356 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 132 transitions. Word has length 87 [2021-11-22 16:09:25,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:09:25,356 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 132 transitions. [2021-11-22 16:09:25,357 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 29 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:09:25,357 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 132 transitions. [2021-11-22 16:09:25,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-22 16:09:25,358 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:09:25,358 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:09:25,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-22 16:09:25,572 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:09:25,572 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:09:25,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:09:25,573 INFO L85 PathProgramCache]: Analyzing trace with hash 1105043030, now seen corresponding path program 20 times [2021-11-22 16:09:25,573 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:09:25,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [458584088] [2021-11-22 16:09:25,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:09:25,573 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:09:25,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:09:25,778 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-11-22 16:09:25,778 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:09:25,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [458584088] [2021-11-22 16:09:25,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [458584088] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:09:25,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2012254094] [2021-11-22 16:09:25,779 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-22 16:09:25,779 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:09:25,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:09:25,780 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:09:25,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-22 16:09:25,869 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-22 16:09:25,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:09:25,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-22 16:09:25,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:09:26,239 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 49 proven. 64 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-11-22 16:09:26,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:09:26,462 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 49 proven. 64 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-11-22 16:09:26,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2012254094] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:09:26,462 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:09:26,462 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-22 16:09:26,462 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601131755] [2021-11-22 16:09:26,463 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:09:26,463 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-22 16:09:26,463 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:09:26,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-22 16:09:26,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=611, Unknown=0, NotChecked=0, Total=812 [2021-11-22 16:09:26,464 INFO L87 Difference]: Start difference. First operand 125 states and 132 transitions. Second operand has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 29 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:09:26,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:09:26,951 INFO L93 Difference]: Finished difference Result 173 states and 185 transitions. [2021-11-22 16:09:26,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-22 16:09:26,951 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 29 states have internal predecessors, (73), 0 states have call successors, (0), 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 89 [2021-11-22 16:09:26,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:09:26,953 INFO L225 Difference]: With dead ends: 173 [2021-11-22 16:09:26,953 INFO L226 Difference]: Without dead ends: 100 [2021-11-22 16:09:26,953 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 166 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=430, Invalid=1052, Unknown=0, NotChecked=0, Total=1482 [2021-11-22 16:09:26,954 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 175 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-22 16:09:26,954 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [175 Valid, 31 Invalid, 448 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [148 Valid, 300 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-22 16:09:26,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-22 16:09:26,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 96. [2021-11-22 16:09:26,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.0526315789473684) internal successors, (100), 95 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:09:26,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 100 transitions. [2021-11-22 16:09:26,976 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 100 transitions. Word has length 89 [2021-11-22 16:09:26,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:09:26,976 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 100 transitions. [2021-11-22 16:09:26,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 29 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:09:26,977 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 100 transitions. [2021-11-22 16:09:26,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-22 16:09:26,977 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:09:26,978 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:09:27,022 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-22 16:09:27,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:09:27,192 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:09:27,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:09:27,193 INFO L85 PathProgramCache]: Analyzing trace with hash 238506300, now seen corresponding path program 21 times [2021-11-22 16:09:27,193 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:09:27,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472855309] [2021-11-22 16:09:27,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:09:27,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:09:27,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:09:35,924 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 9 proven. 311 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 16:09:35,925 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:09:35,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472855309] [2021-11-22 16:09:35,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472855309] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:09:35,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [424499093] [2021-11-22 16:09:35,925 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-22 16:09:35,926 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:09:35,926 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:09:35,926 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:09:35,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-22 16:09:36,055 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-22 16:09:36,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:09:36,059 WARN L261 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 156 conjunts are in the unsatisfiable core [2021-11-22 16:09:36,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:09:46,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:09:46,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:09:46,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:09:46,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:09:46,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:09:46,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:09:46,931 INFO L354 Elim1Store]: treesize reduction 198, result has 40.2 percent of original size [2021-11-22 16:09:46,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 6 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 153 treesize of output 165 [2021-11-22 16:09:47,685 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 9 proven. 295 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-22 16:09:47,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:10:11,955 INFO L354 Elim1Store]: treesize reduction 1329, result has 30.3 percent of original size [2021-11-22 16:10:11,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 317 treesize of output 639 [2021-11-22 16:10:50,458 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 0 proven. 271 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-22 16:10:50,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [424499093] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:10:50,459 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:10:50,459 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 45, 40] total 148 [2021-11-22 16:10:50,459 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685723222] [2021-11-22 16:10:50,459 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:10:50,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 148 states [2021-11-22 16:10:50,460 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:10:50,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2021-11-22 16:10:50,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=980, Invalid=20776, Unknown=0, NotChecked=0, Total=21756 [2021-11-22 16:10:50,462 INFO L87 Difference]: Start difference. First operand 96 states and 100 transitions. Second operand has 148 states, 148 states have (on average 1.662162162162162) internal successors, (246), 148 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:11:16,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:11:16,359 INFO L93 Difference]: Finished difference Result 157 states and 164 transitions. [2021-11-22 16:11:16,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2021-11-22 16:11:16,360 INFO L78 Accepts]: Start accepts. Automaton has has 148 states, 148 states have (on average 1.662162162162162) internal successors, (246), 148 states have internal predecessors, (246), 0 states have call successors, (0), 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 95 [2021-11-22 16:11:16,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:11:16,361 INFO L225 Difference]: With dead ends: 157 [2021-11-22 16:11:16,361 INFO L226 Difference]: Without dead ends: 153 [2021-11-22 16:11:16,363 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 109 SyntacticMatches, 19 SemanticMatches, 227 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12395 ImplicationChecksByTransitivity, 56.4s TimeCoverageRelationStatistics Valid=2683, Invalid=49529, Unknown=0, NotChecked=0, Total=52212 [2021-11-22 16:11:16,364 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 60 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 2403 mSolverCounterSat, 173 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 4193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 173 IncrementalHoareTripleChecker+Valid, 2403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1617 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-22 16:11:16,364 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 228 Invalid, 4193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [173 Valid, 2403 Invalid, 0 Unknown, 1617 Unchecked, 2.0s Time] [2021-11-22 16:11:16,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-11-22 16:11:16,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 137. [2021-11-22 16:11:16,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 136 states have (on average 1.0588235294117647) internal successors, (144), 136 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:11:16,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 144 transitions. [2021-11-22 16:11:16,391 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 144 transitions. Word has length 95 [2021-11-22 16:11:16,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:11:16,391 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 144 transitions. [2021-11-22 16:11:16,391 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 148 states, 148 states have (on average 1.662162162162162) internal successors, (246), 148 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:11:16,392 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 144 transitions. [2021-11-22 16:11:16,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-22 16:11:16,392 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:11:16,393 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:11:16,417 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-22 16:11:16,600 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-22 16:11:16,600 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:11:16,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:11:16,601 INFO L85 PathProgramCache]: Analyzing trace with hash 1624521822, now seen corresponding path program 22 times [2021-11-22 16:11:16,601 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:11:16,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [906266584] [2021-11-22 16:11:16,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:11:16,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:11:16,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:11:16,850 INFO L134 CoverageAnalysis]: Checked inductivity of 337 backedges. 66 proven. 79 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-22 16:11:16,851 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:11:16,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [906266584] [2021-11-22 16:11:16,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [906266584] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:11:16,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1563783584] [2021-11-22 16:11:16,851 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-22 16:11:16,851 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:11:16,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:11:16,857 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:11:16,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-22 16:11:16,939 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-22 16:11:16,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:11:16,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-22 16:11:16,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:11:17,443 INFO L134 CoverageAnalysis]: Checked inductivity of 337 backedges. 81 proven. 64 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-22 16:11:17,443 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:11:17,688 INFO L134 CoverageAnalysis]: Checked inductivity of 337 backedges. 81 proven. 64 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-22 16:11:17,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1563783584] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:11:17,688 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:11:17,688 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2021-11-22 16:11:17,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099842949] [2021-11-22 16:11:17,689 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:11:17,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-22 16:11:17,689 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:11:17,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-22 16:11:17,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=757, Unknown=0, NotChecked=0, Total=992 [2021-11-22 16:11:17,690 INFO L87 Difference]: Start difference. First operand 137 states and 144 transitions. Second operand has 32 states, 32 states have (on average 2.46875) internal successors, (79), 32 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:11:18,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:11:18,131 INFO L93 Difference]: Finished difference Result 272 states and 286 transitions. [2021-11-22 16:11:18,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-22 16:11:18,132 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.46875) internal successors, (79), 32 states have internal predecessors, (79), 0 states have call successors, (0), 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 97 [2021-11-22 16:11:18,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:11:18,133 INFO L225 Difference]: With dead ends: 272 [2021-11-22 16:11:18,133 INFO L226 Difference]: Without dead ends: 140 [2021-11-22 16:11:18,133 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 183 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 375 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=403, Invalid=1319, Unknown=0, NotChecked=0, Total=1722 [2021-11-22 16:11:18,134 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 91 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 553 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 618 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 553 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-22 16:11:18,134 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 69 Invalid, 618 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 553 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-22 16:11:18,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-22 16:11:18,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2021-11-22 16:11:18,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 138 states have (on average 1.0579710144927537) internal successors, (146), 138 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:11:18,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 146 transitions. [2021-11-22 16:11:18,160 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 146 transitions. Word has length 97 [2021-11-22 16:11:18,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:11:18,161 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 146 transitions. [2021-11-22 16:11:18,161 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.46875) internal successors, (79), 32 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:11:18,161 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 146 transitions. [2021-11-22 16:11:18,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-22 16:11:18,162 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:11:18,162 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:11:18,189 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-22 16:11:18,376 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-22 16:11:18,376 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:11:18,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:11:18,377 INFO L85 PathProgramCache]: Analyzing trace with hash 125199872, now seen corresponding path program 23 times [2021-11-22 16:11:18,377 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:11:18,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [167188868] [2021-11-22 16:11:18,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:11:18,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:11:18,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:11:18,638 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 49 proven. 96 refuted. 0 times theorem prover too weak. 209 trivial. 0 not checked. [2021-11-22 16:11:18,638 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:11:18,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [167188868] [2021-11-22 16:11:18,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [167188868] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:11:18,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [237200160] [2021-11-22 16:11:18,638 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-22 16:11:18,638 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:11:18,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:11:18,640 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:11:18,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-22 16:11:19,144 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-22 16:11:19,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:11:19,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-22 16:11:19,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:11:19,523 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 64 proven. 81 refuted. 0 times theorem prover too weak. 209 trivial. 0 not checked. [2021-11-22 16:11:19,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:11:19,710 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 64 proven. 81 refuted. 0 times theorem prover too weak. 209 trivial. 0 not checked. [2021-11-22 16:11:19,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [237200160] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:11:19,711 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:11:19,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2021-11-22 16:11:19,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899796794] [2021-11-22 16:11:19,711 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:11:19,712 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-22 16:11:19,712 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:11:19,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-22 16:11:19,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=749, Unknown=0, NotChecked=0, Total=992 [2021-11-22 16:11:19,713 INFO L87 Difference]: Start difference. First operand 139 states and 146 transitions. Second operand has 32 states, 32 states have (on average 2.46875) internal successors, (79), 32 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:11:20,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:11:20,186 INFO L93 Difference]: Finished difference Result 191 states and 203 transitions. [2021-11-22 16:11:20,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-22 16:11:20,186 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.46875) internal successors, (79), 32 states have internal predecessors, (79), 0 states have call successors, (0), 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 99 [2021-11-22 16:11:20,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:11:20,187 INFO L225 Difference]: With dead ends: 191 [2021-11-22 16:11:20,188 INFO L226 Difference]: Without dead ends: 110 [2021-11-22 16:11:20,188 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 185 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 487 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=522, Invalid=1284, Unknown=0, NotChecked=0, Total=1806 [2021-11-22 16:11:20,189 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 257 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 229 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 257 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 548 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 229 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-22 16:11:20,189 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [257 Valid, 33 Invalid, 548 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [229 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-22 16:11:20,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-22 16:11:20,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 106. [2021-11-22 16:11:20,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.0476190476190477) internal successors, (110), 105 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:11:20,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 110 transitions. [2021-11-22 16:11:20,209 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 110 transitions. Word has length 99 [2021-11-22 16:11:20,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:11:20,209 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 110 transitions. [2021-11-22 16:11:20,209 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.46875) internal successors, (79), 32 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:11:20,209 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 110 transitions. [2021-11-22 16:11:20,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-22 16:11:20,209 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:11:20,210 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:11:20,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-22 16:11:20,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-22 16:11:20,410 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:11:20,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:11:20,411 INFO L85 PathProgramCache]: Analyzing trace with hash -1992502938, now seen corresponding path program 24 times [2021-11-22 16:11:20,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:11:20,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797573183] [2021-11-22 16:11:20,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:11:20,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:11:20,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:11:31,472 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 4 proven. 401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 16:11:31,472 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:11:31,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797573183] [2021-11-22 16:11:31,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [797573183] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:11:31,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [937971478] [2021-11-22 16:11:31,472 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-22 16:11:31,472 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:11:31,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:11:31,473 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:11:31,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-22 16:11:31,627 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-11-22 16:11:31,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:11:31,632 WARN L261 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 174 conjunts are in the unsatisfiable core [2021-11-22 16:11:31,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:11:46,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:11:46,350 INFO L354 Elim1Store]: treesize reduction 188, result has 42.9 percent of original size [2021-11-22 16:11:46,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 2 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 141 treesize of output 181 [2021-11-22 16:11:47,569 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 5 proven. 396 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-22 16:11:47,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:12:22,268 INFO L354 Elim1Store]: treesize reduction 1438, result has 37.8 percent of original size [2021-11-22 16:12:22,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 339 treesize of output 941 [2021-11-22 16:13:20,056 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 341 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-11-22 16:13:20,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [937971478] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:13:20,057 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:13:20,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 52, 44] total 159 [2021-11-22 16:13:20,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615765232] [2021-11-22 16:13:20,057 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:13:20,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 159 states [2021-11-22 16:13:20,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:13:20,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 159 interpolants. [2021-11-22 16:13:20,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1015, Invalid=24107, Unknown=0, NotChecked=0, Total=25122 [2021-11-22 16:13:20,060 INFO L87 Difference]: Start difference. First operand 106 states and 110 transitions. Second operand has 159 states, 159 states have (on average 1.6729559748427674) internal successors, (266), 159 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) [2021-11-22 16:13:53,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:13:53,256 INFO L93 Difference]: Finished difference Result 173 states and 180 transitions. [2021-11-22 16:13:53,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2021-11-22 16:13:53,257 INFO L78 Accepts]: Start accepts. Automaton has has 159 states, 159 states have (on average 1.6729559748427674) internal successors, (266), 159 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) Word has length 105 [2021-11-22 16:13:53,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:13:53,259 INFO L225 Difference]: With dead ends: 173 [2021-11-22 16:13:53,259 INFO L226 Difference]: Without dead ends: 169 [2021-11-22 16:13:53,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 117 SyntacticMatches, 29 SemanticMatches, 248 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14688 ImplicationChecksByTransitivity, 71.5s TimeCoverageRelationStatistics Valid=2807, Invalid=59443, Unknown=0, NotChecked=0, Total=62250 [2021-11-22 16:13:53,265 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 29 mSDsluCounter, 243 mSDsCounter, 0 mSdLazyCounter, 2267 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 4176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 2267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1837 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-22 16:13:53,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 252 Invalid, 4176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 2267 Invalid, 0 Unknown, 1837 Unchecked, 2.0s Time] [2021-11-22 16:13:53,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-11-22 16:13:53,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 151. [2021-11-22 16:13:53,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 150 states have (on average 1.0533333333333332) internal successors, (158), 150 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:13:53,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 158 transitions. [2021-11-22 16:13:53,292 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 158 transitions. Word has length 105 [2021-11-22 16:13:53,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:13:53,293 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 158 transitions. [2021-11-22 16:13:53,293 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 159 states, 159 states have (on average 1.6729559748427674) internal successors, (266), 159 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) [2021-11-22 16:13:53,293 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 158 transitions. [2021-11-22 16:13:53,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-22 16:13:53,294 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:13:53,295 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:13:53,324 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-22 16:13:53,504 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-22 16:13:53,505 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:13:53,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:13:53,505 INFO L85 PathProgramCache]: Analyzing trace with hash 813324808, now seen corresponding path program 25 times [2021-11-22 16:13:53,505 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:13:53,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629086938] [2021-11-22 16:13:53,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:13:53,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:13:53,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:13:53,837 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 83 proven. 98 refuted. 0 times theorem prover too weak. 243 trivial. 0 not checked. [2021-11-22 16:13:53,837 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:13:53,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629086938] [2021-11-22 16:13:53,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629086938] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:13:53,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [776119688] [2021-11-22 16:13:53,837 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-22 16:13:53,838 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:13:53,838 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:13:53,841 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:13:53,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-22 16:13:53,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:13:53,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-22 16:13:53,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:13:54,573 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 100 proven. 81 refuted. 0 times theorem prover too weak. 243 trivial. 0 not checked. [2021-11-22 16:13:54,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:13:54,817 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 100 proven. 81 refuted. 0 times theorem prover too weak. 243 trivial. 0 not checked. [2021-11-22 16:13:54,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [776119688] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:13:54,817 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:13:54,817 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2021-11-22 16:13:54,817 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109277175] [2021-11-22 16:13:54,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:13:54,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-22 16:13:54,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:13:54,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-22 16:13:54,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=910, Unknown=0, NotChecked=0, Total=1190 [2021-11-22 16:13:54,819 INFO L87 Difference]: Start difference. First operand 151 states and 158 transitions. Second operand has 35 states, 35 states have (on average 2.4285714285714284) internal successors, (85), 35 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:13:55,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:13:55,393 INFO L93 Difference]: Finished difference Result 300 states and 314 transitions. [2021-11-22 16:13:55,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-22 16:13:55,393 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.4285714285714284) internal successors, (85), 35 states have internal predecessors, (85), 0 states have call successors, (0), 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 107 [2021-11-22 16:13:55,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:13:55,394 INFO L225 Difference]: With dead ends: 300 [2021-11-22 16:13:55,394 INFO L226 Difference]: Without dead ends: 154 [2021-11-22 16:13:55,395 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 202 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 453 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=481, Invalid=1589, Unknown=0, NotChecked=0, Total=2070 [2021-11-22 16:13:55,395 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 113 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 626 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 725 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 626 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-22 16:13:55,396 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 70 Invalid, 725 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 626 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-22 16:13:55,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-11-22 16:13:55,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2021-11-22 16:13:55,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.0526315789473684) internal successors, (160), 152 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:13:55,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 160 transitions. [2021-11-22 16:13:55,428 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 160 transitions. Word has length 107 [2021-11-22 16:13:55,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:13:55,429 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 160 transitions. [2021-11-22 16:13:55,429 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.4285714285714284) internal successors, (85), 35 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:13:55,429 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 160 transitions. [2021-11-22 16:13:55,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-22 16:13:55,430 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:13:55,431 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:13:55,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-22 16:13:55,644 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:13:55,644 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:13:55,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:13:55,645 INFO L85 PathProgramCache]: Analyzing trace with hash 1307992362, now seen corresponding path program 26 times [2021-11-22 16:13:55,645 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:13:55,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103939104] [2021-11-22 16:13:55,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:13:55,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:13:55,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:13:55,982 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 64 proven. 117 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2021-11-22 16:13:55,982 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:13:55,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103939104] [2021-11-22 16:13:55,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2103939104] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:13:55,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396669375] [2021-11-22 16:13:55,983 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-22 16:13:55,983 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:13:55,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:13:55,984 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:13:56,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-22 16:13:56,082 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-22 16:13:56,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:13:56,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-22 16:13:56,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:13:56,494 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 81 proven. 100 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2021-11-22 16:13:56,494 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:13:56,723 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 81 proven. 100 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2021-11-22 16:13:56,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1396669375] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:13:56,723 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:13:56,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2021-11-22 16:13:56,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830540632] [2021-11-22 16:13:56,724 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:13:56,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-22 16:13:56,724 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:13:56,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-22 16:13:56,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=289, Invalid=901, Unknown=0, NotChecked=0, Total=1190 [2021-11-22 16:13:56,726 INFO L87 Difference]: Start difference. First operand 153 states and 160 transitions. Second operand has 35 states, 35 states have (on average 2.4285714285714284) internal successors, (85), 35 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:13:57,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:13:57,231 INFO L93 Difference]: Finished difference Result 209 states and 221 transitions. [2021-11-22 16:13:57,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-22 16:13:57,232 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.4285714285714284) internal successors, (85), 35 states have internal predecessors, (85), 0 states have call successors, (0), 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 109 [2021-11-22 16:13:57,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:13:57,233 INFO L225 Difference]: With dead ends: 209 [2021-11-22 16:13:57,233 INFO L226 Difference]: Without dead ends: 120 [2021-11-22 16:13:57,233 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 204 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 593 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=623, Invalid=1539, Unknown=0, NotChecked=0, Total=2162 [2021-11-22 16:13:57,234 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 355 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 305 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 355 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 602 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 305 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-22 16:13:57,234 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [355 Valid, 26 Invalid, 602 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [305 Valid, 297 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-22 16:13:57,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-22 16:13:57,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 116. [2021-11-22 16:13:57,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.0434782608695652) internal successors, (120), 115 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:13:57,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 120 transitions. [2021-11-22 16:13:57,264 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 120 transitions. Word has length 109 [2021-11-22 16:13:57,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:13:57,264 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 120 transitions. [2021-11-22 16:13:57,264 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.4285714285714284) internal successors, (85), 35 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:13:57,264 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 120 transitions. [2021-11-22 16:13:57,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-22 16:13:57,265 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:13:57,265 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:13:57,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-22 16:13:57,465 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-22 16:13:57,466 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:13:57,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:13:57,466 INFO L85 PathProgramCache]: Analyzing trace with hash 931456272, now seen corresponding path program 27 times [2021-11-22 16:13:57,466 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 16:13:57,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1919324783] [2021-11-22 16:13:57,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:13:57,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 16:13:57,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:14:08,995 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 16 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 16:14:08,995 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 16:14:08,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1919324783] [2021-11-22 16:14:08,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1919324783] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 16:14:08,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [965441103] [2021-11-22 16:14:08,996 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-22 16:14:08,996 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:14:08,996 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:14:08,997 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 16:14:09,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-22 16:14:09,221 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-22 16:14:09,221 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:14:09,226 WARN L261 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 193 conjunts are in the unsatisfiable core [2021-11-22 16:14:09,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:14:09,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-22 16:14:33,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:14:33,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:14:33,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:14:33,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:14:33,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:14:33,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:14:33,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:14:33,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:14:33,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:14:33,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:14:34,606 INFO L354 Elim1Store]: treesize reduction 660, result has 40.8 percent of original size [2021-11-22 16:14:34,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 11 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 247 treesize of output 505 [2021-11-22 16:15:04,565 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 11 proven. 464 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-22 16:15:04,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:15:45,795 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 0 proven. 419 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-22 16:15:45,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [965441103] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:15:45,796 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 16:15:45,796 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 54, 47] total 179 [2021-11-22 16:15:45,796 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552104213] [2021-11-22 16:15:45,796 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 16:15:45,797 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 179 states [2021-11-22 16:15:45,797 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 16:15:45,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 179 interpolants. [2021-11-22 16:15:45,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1826, Invalid=30036, Unknown=0, NotChecked=0, Total=31862 [2021-11-22 16:15:45,799 INFO L87 Difference]: Start difference. First operand 116 states and 120 transitions. Second operand has 179 states, 179 states have (on average 1.6536312849162011) internal successors, (296), 179 states have internal predecessors, (296), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:16:35,060 WARN L228 Executor]: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) stderr output: (error "out of memory") [2021-11-22 16:16:35,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2021-11-22 16:16:35,064 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 131 SyntacticMatches, 26 SemanticMatches, 265 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20084 ImplicationChecksByTransitivity, 105.2s TimeCoverageRelationStatistics Valid=4170, Invalid=66852, Unknown=0, NotChecked=0, Total=71022 [2021-11-22 16:16:35,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 101 [2021-11-22 16:16:35,065 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 48 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 2803 mSolverCounterSat, 190 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 5207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 190 IncrementalHoareTripleChecker+Valid, 2803 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2214 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-22 16:16:35,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 70 Invalid, 5207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [190 Valid, 2803 Invalid, 0 Unknown, 2214 Unchecked, 2.5s Time] [2021-11-22 16:16:35,091 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-22 16:16:35,280 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 16:16:35,281 FATAL L? ?]: An unrecoverable error occured during an interaction with an SMT solver: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:241) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parseCheckSatResult(Executor.java:260) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.checkSat(Scriptor.java:155) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.checkSat(WrapperScript.java:163) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.checkSat(WrapperScript.java:163) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.checkSat(ManagedScript.java:139) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker.checkImplication(MonolithicImplicationChecker.java:85) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier$PredicateComparison.compare(PredicateUnifier.java:899) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier$PredicateComparison.(PredicateUnifier.java:773) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate(PredicateUnifier.java:345) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicateForConjunction(PredicateUnifier.java:388) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicateForConjunction(PredicateUnifier.java:229) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.DeterministicInterpolantAutomaton.getOrConstructPredicate(DeterministicInterpolantAutomaton.java:282) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.DeterministicInterpolantAutomaton.constructSuccessorsAndTransitions(DeterministicInterpolantAutomaton.java:304) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:79) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:233) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.TotalizeNwa.internalSuccessors(TotalizeNwa.java:213) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ComplementDeterministicNwa.internalSuccessors(ComplementDeterministicNwa.java:121) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:216) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:208) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.addInternalsAndSuccessors(NestedWordAutomatonReachableStates.java:1058) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.(NestedWordAutomatonReachableStates.java:960) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates.(NestedWordAutomatonReachableStates.java:182) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.computeDifference(Difference.java:137) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.(Difference.java:90) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.computeAutomataDifference(BasicCegarLoop.java:868) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.refineAbstraction(BasicCegarLoop.java:784) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.refineAbstractionInternal(AbstractCegarLoop.java:462) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:420) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) Caused by: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: EOF at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser$Action$.CUP$do_action(Parser.java:1465) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser.do_action(Parser.java:658) at com.github.jhoenicke.javacup.runtime.LRParser.parse(LRParser.java:383) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:237) ... 49 more [2021-11-22 16:16:35,284 INFO L158 Benchmark]: Toolchain (without parser) took 603253.53ms. Allocated memory was 96.5MB in the beginning and 461.4MB in the end (delta: 364.9MB). Free memory was 63.1MB in the beginning and 235.3MB in the end (delta: -172.2MB). Peak memory consumption was 192.2MB. Max. memory is 16.1GB. [2021-11-22 16:16:35,284 INFO L158 Benchmark]: CDTParser took 0.14ms. Allocated memory is still 96.5MB. Free memory was 52.7MB in the beginning and 52.6MB in the end (delta: 77.0kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-22 16:16:35,285 INFO L158 Benchmark]: CACSL2BoogieTranslator took 263.10ms. Allocated memory is still 96.5MB. Free memory was 63.1MB in the beginning and 71.0MB in the end (delta: -7.9MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-22 16:16:35,285 INFO L158 Benchmark]: Boogie Procedure Inliner took 33.54ms. Allocated memory is still 96.5MB. Free memory was 71.0MB in the beginning and 69.4MB in the end (delta: 1.6MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-22 16:16:35,285 INFO L158 Benchmark]: Boogie Preprocessor took 24.84ms. Allocated memory is still 96.5MB. Free memory was 69.4MB in the beginning and 68.1MB in the end (delta: 1.3MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-11-22 16:16:35,286 INFO L158 Benchmark]: RCFGBuilder took 310.12ms. Allocated memory is still 96.5MB. Free memory was 68.1MB in the beginning and 58.1MB in the end (delta: 10.0MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-22 16:16:35,286 INFO L158 Benchmark]: TraceAbstraction took 602616.27ms. Allocated memory was 96.5MB in the beginning and 461.4MB in the end (delta: 364.9MB). Free memory was 57.3MB in the beginning and 235.3MB in the end (delta: -178.0MB). Peak memory consumption was 189.0MB. Max. memory is 16.1GB. [2021-11-22 16:16:35,288 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14ms. Allocated memory is still 96.5MB. Free memory was 52.7MB in the beginning and 52.6MB in the end (delta: 77.0kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 263.10ms. Allocated memory is still 96.5MB. Free memory was 63.1MB in the beginning and 71.0MB in the end (delta: -7.9MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 33.54ms. Allocated memory is still 96.5MB. Free memory was 71.0MB in the beginning and 69.4MB in the end (delta: 1.6MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 24.84ms. Allocated memory is still 96.5MB. Free memory was 69.4MB in the beginning and 68.1MB in the end (delta: 1.3MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * RCFGBuilder took 310.12ms. Allocated memory is still 96.5MB. Free memory was 68.1MB in the beginning and 58.1MB in the end (delta: 10.0MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 602616.27ms. Allocated memory was 96.5MB in the beginning and 461.4MB in the end (delta: 364.9MB). Free memory was 57.3MB in the beginning and 235.3MB in the end (delta: -178.0MB). Peak memory consumption was 189.0MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") : de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:241) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/config/AutomizerReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/config/svcomp-Reach-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0 --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 9040b900faf23bbe274a78992b583d0e69cb8306e352833058a15642ef75b25a --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-22 16:16:37,903 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-22 16:16:37,906 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-22 16:16:37,943 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-22 16:16:37,943 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-22 16:16:37,945 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-22 16:16:37,948 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-22 16:16:37,951 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-22 16:16:37,954 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-22 16:16:37,956 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-22 16:16:37,958 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-22 16:16:37,960 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-22 16:16:37,961 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-22 16:16:37,963 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-22 16:16:37,965 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-22 16:16:37,967 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-22 16:16:37,968 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-22 16:16:37,970 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-22 16:16:37,973 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-22 16:16:37,976 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-22 16:16:37,979 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-22 16:16:37,981 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-22 16:16:37,983 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-22 16:16:37,985 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-22 16:16:37,990 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-22 16:16:37,991 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-22 16:16:37,991 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-22 16:16:37,993 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-22 16:16:37,994 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-22 16:16:37,995 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-22 16:16:38,004 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-22 16:16:38,006 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-22 16:16:38,008 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-22 16:16:38,010 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-22 16:16:38,014 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-22 16:16:38,015 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-22 16:16:38,017 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-22 16:16:38,018 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-22 16:16:38,019 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-22 16:16:38,021 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-22 16:16:38,022 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-22 16:16:38,023 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/config/svcomp-Reach-32bit-Automizer_Bitvector.epf [2021-11-22 16:16:38,079 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-22 16:16:38,079 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-22 16:16:38,080 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-22 16:16:38,081 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-22 16:16:38,083 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-22 16:16:38,084 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-22 16:16:38,084 INFO L138 SettingsManager]: * Use SBE=true [2021-11-22 16:16:38,084 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-22 16:16:38,085 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-22 16:16:38,085 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-22 16:16:38,086 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-22 16:16:38,086 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-22 16:16:38,087 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-22 16:16:38,087 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-22 16:16:38,087 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-22 16:16:38,088 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-22 16:16:38,088 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-22 16:16:38,088 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-22 16:16:38,088 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-22 16:16:38,089 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-22 16:16:38,089 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-22 16:16:38,089 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-22 16:16:38,090 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-22 16:16:38,090 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-22 16:16:38,090 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-22 16:16:38,090 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-22 16:16:38,091 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-22 16:16:38,091 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-22 16:16:38,091 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-11-22 16:16:38,092 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-22 16:16:38,092 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-22 16:16:38,092 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-22 16:16:38,093 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-22 16:16:38,093 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-22 16:16:38,093 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-22 16:16:38,093 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9040b900faf23bbe274a78992b583d0e69cb8306e352833058a15642ef75b25a [2021-11-22 16:16:38,560 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-22 16:16:38,585 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-22 16:16:38,588 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-22 16:16:38,590 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-22 16:16:38,591 INFO L275 PluginConnector]: CDTParser initialized [2021-11-22 16:16:38,593 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/../../sv-benchmarks/c/array-crafted/zero_sum2.c [2021-11-22 16:16:38,667 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/data/a5db3a890/27773df18ff340a2a10173e222f2fccb/FLAG60dd1d481 [2021-11-22 16:16:39,265 INFO L306 CDTParser]: Found 1 translation units. [2021-11-22 16:16:39,266 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/sv-benchmarks/c/array-crafted/zero_sum2.c [2021-11-22 16:16:39,275 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/data/a5db3a890/27773df18ff340a2a10173e222f2fccb/FLAG60dd1d481 [2021-11-22 16:16:39,614 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/data/a5db3a890/27773df18ff340a2a10173e222f2fccb [2021-11-22 16:16:39,619 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-22 16:16:39,622 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-22 16:16:39,625 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-22 16:16:39,625 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-22 16:16:39,630 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-22 16:16:39,631 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 04:16:39" (1/1) ... [2021-11-22 16:16:39,632 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@694a46ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:16:39, skipping insertion in model container [2021-11-22 16:16:39,633 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 04:16:39" (1/1) ... [2021-11-22 16:16:39,642 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-22 16:16:39,663 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-22 16:16:39,890 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/sv-benchmarks/c/array-crafted/zero_sum2.c[400,413] [2021-11-22 16:16:39,926 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-22 16:16:39,942 INFO L203 MainTranslator]: Completed pre-run [2021-11-22 16:16:39,984 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/sv-benchmarks/c/array-crafted/zero_sum2.c[400,413] [2021-11-22 16:16:40,023 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-22 16:16:40,041 INFO L208 MainTranslator]: Completed translation [2021-11-22 16:16:40,042 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:16:40 WrapperNode [2021-11-22 16:16:40,042 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-22 16:16:40,044 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-22 16:16:40,044 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-22 16:16:40,044 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-22 16:16:40,053 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:16:40" (1/1) ... [2021-11-22 16:16:40,080 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:16:40" (1/1) ... [2021-11-22 16:16:40,114 INFO L137 Inliner]: procedures = 17, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 81 [2021-11-22 16:16:40,115 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-22 16:16:40,116 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-22 16:16:40,116 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-22 16:16:40,116 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-22 16:16:40,125 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:16:40" (1/1) ... [2021-11-22 16:16:40,126 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:16:40" (1/1) ... [2021-11-22 16:16:40,134 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:16:40" (1/1) ... [2021-11-22 16:16:40,135 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:16:40" (1/1) ... [2021-11-22 16:16:40,155 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:16:40" (1/1) ... [2021-11-22 16:16:40,162 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:16:40" (1/1) ... [2021-11-22 16:16:40,163 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:16:40" (1/1) ... [2021-11-22 16:16:40,166 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-22 16:16:40,167 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-22 16:16:40,168 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-22 16:16:40,168 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-22 16:16:40,169 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:16:40" (1/1) ... [2021-11-22 16:16:40,177 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-22 16:16:40,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 16:16:40,203 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-22 16:16:40,226 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-22 16:16:40,261 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-22 16:16:40,262 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-22 16:16:40,262 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-22 16:16:40,262 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE2 [2021-11-22 16:16:40,262 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-22 16:16:40,262 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-22 16:16:40,263 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE2 [2021-11-22 16:16:40,263 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-22 16:16:40,364 INFO L236 CfgBuilder]: Building ICFG [2021-11-22 16:16:40,366 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-22 16:16:40,644 INFO L277 CfgBuilder]: Performing block encoding [2021-11-22 16:16:40,651 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-22 16:16:40,651 INFO L301 CfgBuilder]: Removed 5 assume(true) statements. [2021-11-22 16:16:40,653 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 04:16:40 BoogieIcfgContainer [2021-11-22 16:16:40,654 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-22 16:16:40,656 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-22 16:16:40,656 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-22 16:16:40,659 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-22 16:16:40,660 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 04:16:39" (1/3) ... [2021-11-22 16:16:40,661 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@666938e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 04:16:40, skipping insertion in model container [2021-11-22 16:16:40,661 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 04:16:40" (2/3) ... [2021-11-22 16:16:40,662 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@666938e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 04:16:40, skipping insertion in model container [2021-11-22 16:16:40,662 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 04:16:40" (3/3) ... [2021-11-22 16:16:40,664 INFO L111 eAbstractionObserver]: Analyzing ICFG zero_sum2.c [2021-11-22 16:16:40,670 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-22 16:16:40,671 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-22 16:16:40,807 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-22 16:16:40,824 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 [2021-11-22 16:16:40,824 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-22 16:16:40,843 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 24 states have (on average 1.5416666666666667) 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) [2021-11-22 16:16:40,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-22 16:16:40,850 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:16:40,851 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:16:40,852 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:16:40,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:16:40,865 INFO L85 PathProgramCache]: Analyzing trace with hash -1122046426, now seen corresponding path program 1 times [2021-11-22 16:16:40,879 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 16:16:40,880 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1194282755] [2021-11-22 16:16:40,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:16:40,881 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 16:16:40,882 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 16:16:40,885 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 16:16:40,904 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-22 16:16:40,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:16:41,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-22 16:16:41,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:16:41,102 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 16:16:41,102 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:16:41,189 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 16:16:41,190 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 16:16:41,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1194282755] [2021-11-22 16:16:41,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1194282755] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-22 16:16:41,191 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-22 16:16:41,192 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-22 16:16:41,194 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308665509] [2021-11-22 16:16:41,195 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-22 16:16:41,200 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-22 16:16:41,200 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 16:16:41,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-22 16:16:41,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-22 16:16:41,235 INFO L87 Difference]: Start difference. First operand has 26 states, 24 states have (on average 1.5416666666666667) 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) Second operand has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 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) [2021-11-22 16:16:41,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:16:41,254 INFO L93 Difference]: Finished difference Result 47 states and 66 transitions. [2021-11-22 16:16:41,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-22 16:16:41,257 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 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 15 [2021-11-22 16:16:41,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:16:41,266 INFO L225 Difference]: With dead ends: 47 [2021-11-22 16:16:41,266 INFO L226 Difference]: Without dead ends: 21 [2021-11-22 16:16:41,270 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-22 16:16:41,274 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-22 16:16:41,276 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-22 16:16:41,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-22 16:16:41,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-22 16:16:41,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.25) internal successors, (25), 20 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) [2021-11-22 16:16:41,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-11-22 16:16:41,323 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 15 [2021-11-22 16:16:41,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:16:41,324 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-11-22 16:16:41,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 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) [2021-11-22 16:16:41,325 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-11-22 16:16:41,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-22 16:16:41,326 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:16:41,326 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:16:41,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-22 16:16:41,539 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 16:16:41,540 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:16:41,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:16:41,541 INFO L85 PathProgramCache]: Analyzing trace with hash -1896542740, now seen corresponding path program 1 times [2021-11-22 16:16:41,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 16:16:41,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1057202655] [2021-11-22 16:16:41,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:16:41,543 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 16:16:41,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 16:16:41,545 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 16:16:41,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-22 16:16:41,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:16:41,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-22 16:16:41,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:16:41,709 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 16:16:41,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:16:41,773 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 16:16:41,774 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 16:16:41,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1057202655] [2021-11-22 16:16:41,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1057202655] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-22 16:16:41,775 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-22 16:16:41,775 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 5 [2021-11-22 16:16:41,775 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151450550] [2021-11-22 16:16:41,776 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-22 16:16:41,777 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-22 16:16:41,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 16:16:41,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-22 16:16:41,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-22 16:16:41,779 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 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) [2021-11-22 16:16:41,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:16:41,853 INFO L93 Difference]: Finished difference Result 32 states and 39 transitions. [2021-11-22 16:16:41,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-22 16:16:41,854 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 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 [2021-11-22 16:16:41,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:16:41,856 INFO L225 Difference]: With dead ends: 32 [2021-11-22 16:16:41,856 INFO L226 Difference]: Without dead ends: 28 [2021-11-22 16:16:41,857 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-22 16:16:41,859 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 3 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-22 16:16:41,860 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 72 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-22 16:16:41,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-22 16:16:41,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-22 16:16:41,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 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) [2021-11-22 16:16:41,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2021-11-22 16:16:41,869 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 15 [2021-11-22 16:16:41,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:16:41,870 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2021-11-22 16:16:41,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 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) [2021-11-22 16:16:41,870 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2021-11-22 16:16:41,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-22 16:16:41,871 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:16:41,872 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:16:41,891 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-22 16:16:42,086 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 16:16:42,086 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:16:42,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:16:42,087 INFO L85 PathProgramCache]: Analyzing trace with hash -1458205426, now seen corresponding path program 1 times [2021-11-22 16:16:42,088 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 16:16:42,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [828165984] [2021-11-22 16:16:42,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:16:42,089 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 16:16:42,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 16:16:42,090 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 16:16:42,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-22 16:16:42,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:16:42,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-22 16:16:42,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:16:42,251 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 16:16:42,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:16:42,311 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 16:16:42,312 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 16:16:42,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [828165984] [2021-11-22 16:16:42,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [828165984] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-22 16:16:42,312 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-22 16:16:42,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-22 16:16:42,313 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317973605] [2021-11-22 16:16:42,313 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-22 16:16:42,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-22 16:16:42,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 16:16:42,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-22 16:16:42,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-22 16:16:42,316 INFO L87 Difference]: Start difference. First operand 28 states and 35 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) [2021-11-22 16:16:42,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:16:42,381 INFO L93 Difference]: Finished difference Result 54 states and 69 transitions. [2021-11-22 16:16:42,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-22 16:16:42,382 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 17 [2021-11-22 16:16:42,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:16:42,383 INFO L225 Difference]: With dead ends: 54 [2021-11-22 16:16:42,383 INFO L226 Difference]: Without dead ends: 31 [2021-11-22 16:16:42,384 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-22 16:16:42,386 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 3 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-22 16:16:42,387 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 34 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-22 16:16:42,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-22 16:16:42,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-22 16:16:42,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 30 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) [2021-11-22 16:16:42,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2021-11-22 16:16:42,408 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 17 [2021-11-22 16:16:42,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:16:42,409 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2021-11-22 16:16:42,413 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) [2021-11-22 16:16:42,413 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2021-11-22 16:16:42,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-22 16:16:42,427 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:16:42,428 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:16:42,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-22 16:16:42,628 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 16:16:42,629 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:16:42,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:16:42,630 INFO L85 PathProgramCache]: Analyzing trace with hash 668215250, now seen corresponding path program 1 times [2021-11-22 16:16:42,630 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 16:16:42,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1465246849] [2021-11-22 16:16:42,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:16:42,631 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 16:16:42,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 16:16:42,633 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 16:16:42,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-22 16:16:42,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:16:42,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-22 16:16:42,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:16:42,933 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 16:16:42,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:16:43,221 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 16:16:43,222 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 16:16:43,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1465246849] [2021-11-22 16:16:43,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1465246849] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:16:43,225 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-22 16:16:43,225 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-11-22 16:16:43,225 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984871167] [2021-11-22 16:16:43,226 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-22 16:16:43,226 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-22 16:16:43,227 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 16:16:43,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-22 16:16:43,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2021-11-22 16:16:43,231 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 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) [2021-11-22 16:16:43,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:16:43,696 INFO L93 Difference]: Finished difference Result 78 states and 102 transitions. [2021-11-22 16:16:43,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-22 16:16:43,697 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 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 21 [2021-11-22 16:16:43,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:16:43,699 INFO L225 Difference]: With dead ends: 78 [2021-11-22 16:16:43,699 INFO L226 Difference]: Without dead ends: 59 [2021-11-22 16:16:43,700 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2021-11-22 16:16:43,701 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 85 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-22 16:16:43,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 59 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-22 16:16:43,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-22 16:16:43,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2021-11-22 16:16:43,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.18) internal successors, (59), 50 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:16:43,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 59 transitions. [2021-11-22 16:16:43,730 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 59 transitions. Word has length 21 [2021-11-22 16:16:43,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:16:43,731 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 59 transitions. [2021-11-22 16:16:43,731 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 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) [2021-11-22 16:16:43,731 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 59 transitions. [2021-11-22 16:16:43,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-22 16:16:43,732 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:16:43,733 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:16:43,749 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (5)] Ended with exit code 0 [2021-11-22 16:16:43,933 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 16:16:43,933 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:16:43,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:16:43,934 INFO L85 PathProgramCache]: Analyzing trace with hash 354027738, now seen corresponding path program 1 times [2021-11-22 16:16:43,935 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 16:16:43,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [995799070] [2021-11-22 16:16:43,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 16:16:43,936 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 16:16:43,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 16:16:43,937 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 16:16:43,941 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-22 16:16:44,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:16:44,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-22 16:16:44,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:16:44,368 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-22 16:16:44,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:16:44,752 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-22 16:16:44,752 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 16:16:44,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [995799070] [2021-11-22 16:16:44,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [995799070] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:16:44,753 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-22 16:16:44,753 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2021-11-22 16:16:44,754 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800503590] [2021-11-22 16:16:44,754 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-22 16:16:44,754 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-22 16:16:44,755 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 16:16:44,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-22 16:16:44,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=167, Unknown=0, NotChecked=0, Total=240 [2021-11-22 16:16:44,756 INFO L87 Difference]: Start difference. First operand 51 states and 59 transitions. Second operand has 16 states, 16 states have (on average 2.5625) internal successors, (41), 16 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) [2021-11-22 16:16:45,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:16:45,702 INFO L93 Difference]: Finished difference Result 121 states and 143 transitions. [2021-11-22 16:16:45,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-22 16:16:45,703 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.5625) internal successors, (41), 16 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 29 [2021-11-22 16:16:45,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:16:45,705 INFO L225 Difference]: With dead ends: 121 [2021-11-22 16:16:45,705 INFO L226 Difference]: Without dead ends: 105 [2021-11-22 16:16:45,706 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=196, Invalid=454, Unknown=0, NotChecked=0, Total=650 [2021-11-22 16:16:45,707 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 210 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 367 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-22 16:16:45,708 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 84 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 367 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-22 16:16:45,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-22 16:16:45,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 36. [2021-11-22 16:16:45,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 35 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) [2021-11-22 16:16:45,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2021-11-22 16:16:45,726 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 29 [2021-11-22 16:16:45,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:16:45,727 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2021-11-22 16:16:45,727 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.5625) internal successors, (41), 16 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) [2021-11-22 16:16:45,727 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2021-11-22 16:16:45,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-22 16:16:45,729 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:16:45,729 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:16:45,754 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-22 16:16:45,957 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 16:16:45,958 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:16:45,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:16:45,959 INFO L85 PathProgramCache]: Analyzing trace with hash -2048824896, now seen corresponding path program 2 times [2021-11-22 16:16:45,959 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 16:16:45,959 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1321686650] [2021-11-22 16:16:45,960 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-22 16:16:45,960 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 16:16:45,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 16:16:45,961 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 16:16:45,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-22 16:16:46,475 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-22 16:16:46,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:16:46,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-22 16:16:46,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:16:47,092 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-11-22 16:16:47,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 21 [2021-11-22 16:16:47,156 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 16:16:47,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:16:50,457 INFO L354 Elim1Store]: treesize reduction 39, result has 52.4 percent of original size [2021-11-22 16:16:50,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 47 treesize of output 63 [2021-11-22 16:16:58,309 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-22 16:16:58,309 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 16:16:58,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1321686650] [2021-11-22 16:16:58,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1321686650] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:16:58,310 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-22 16:16:58,310 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 20 [2021-11-22 16:16:58,310 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57344710] [2021-11-22 16:16:58,310 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-22 16:16:58,311 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-22 16:16:58,311 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 16:16:58,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-22 16:16:58,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=328, Unknown=2, NotChecked=0, Total=380 [2021-11-22 16:16:58,312 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand has 20 states, 20 states have (on average 2.7) internal successors, (54), 20 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:17:00,627 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-22 16:17:05,031 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-22 16:17:07,326 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-22 16:17:09,656 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-22 16:17:10,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:17:10,100 INFO L93 Difference]: Finished difference Result 60 states and 67 transitions. [2021-11-22 16:17:10,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-22 16:17:10,101 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.7) internal successors, (54), 20 states have internal predecessors, (54), 0 states have call successors, (0), 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 [2021-11-22 16:17:10,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:17:10,102 INFO L225 Difference]: With dead ends: 60 [2021-11-22 16:17:10,102 INFO L226 Difference]: Without dead ends: 56 [2021-11-22 16:17:10,103 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 45 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=60, Invalid=400, Unknown=2, NotChecked=0, Total=462 [2021-11-22 16:17:10,104 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 5 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 484 mSolverCounterSat, 1 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 500 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 484 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 11 IncrementalHoareTripleChecker+Unchecked, 9.6s IncrementalHoareTripleChecker+Time [2021-11-22 16:17:10,105 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 120 Invalid, 500 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 484 Invalid, 4 Unknown, 11 Unchecked, 9.6s Time] [2021-11-22 16:17:10,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-22 16:17:10,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2021-11-22 16:17:10,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.1538461538461537) internal successors, (60), 52 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) [2021-11-22 16:17:10,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2021-11-22 16:17:10,119 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 35 [2021-11-22 16:17:10,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:17:10,120 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2021-11-22 16:17:10,120 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.7) internal successors, (54), 20 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:17:10,121 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2021-11-22 16:17:10,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-22 16:17:10,122 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:17:10,122 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:17:10,136 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-22 16:17:10,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 16:17:10,323 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:17:10,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:17:10,324 INFO L85 PathProgramCache]: Analyzing trace with hash -1772469278, now seen corresponding path program 3 times [2021-11-22 16:17:10,324 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 16:17:10,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1243422615] [2021-11-22 16:17:10,325 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-22 16:17:10,325 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 16:17:10,325 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 16:17:10,326 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 16:17:10,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-22 16:17:10,459 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-22 16:17:10,459 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:17:10,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-22 16:17:10,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:17:10,839 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-22 16:17:10,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:17:11,548 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-22 16:17:11,548 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 16:17:11,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1243422615] [2021-11-22 16:17:11,549 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1243422615] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:17:11,549 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-22 16:17:11,549 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 18 [2021-11-22 16:17:11,550 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370853533] [2021-11-22 16:17:11,550 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-22 16:17:11,550 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-22 16:17:11,551 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 16:17:11,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-22 16:17:11,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=234, Unknown=0, NotChecked=0, Total=306 [2021-11-22 16:17:11,552 INFO L87 Difference]: Start difference. First operand 53 states and 60 transitions. Second operand has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 18 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:17:12,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:17:12,340 INFO L93 Difference]: Finished difference Result 104 states and 118 transitions. [2021-11-22 16:17:12,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-22 16:17:12,341 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 18 states have internal predecessors, (57), 0 states have call successors, (0), 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 [2021-11-22 16:17:12,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:17:12,345 INFO L225 Difference]: With dead ends: 104 [2021-11-22 16:17:12,346 INFO L226 Difference]: Without dead ends: 56 [2021-11-22 16:17:12,348 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=127, Invalid=379, Unknown=0, NotChecked=0, Total=506 [2021-11-22 16:17:12,349 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 84 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 278 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 278 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-22 16:17:12,349 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 56 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 278 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-22 16:17:12,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-22 16:17:12,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-11-22 16:17:12,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.1481481481481481) internal successors, (62), 54 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:17:12,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 62 transitions. [2021-11-22 16:17:12,360 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 62 transitions. Word has length 37 [2021-11-22 16:17:12,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:17:12,360 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 62 transitions. [2021-11-22 16:17:12,360 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 18 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:17:12,360 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 62 transitions. [2021-11-22 16:17:12,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-22 16:17:12,362 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:17:12,362 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:17:12,378 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-22 16:17:12,575 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 16:17:12,575 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:17:12,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:17:12,576 INFO L85 PathProgramCache]: Analyzing trace with hash -1270817660, now seen corresponding path program 4 times [2021-11-22 16:17:12,576 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 16:17:12,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [878020436] [2021-11-22 16:17:12,576 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-22 16:17:12,577 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 16:17:12,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 16:17:12,578 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 16:17:12,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-22 16:17:12,671 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-22 16:17:12,671 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:17:12,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-22 16:17:12,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:17:12,942 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-22 16:17:12,942 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:17:13,456 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-22 16:17:13,456 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 16:17:13,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [878020436] [2021-11-22 16:17:13,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [878020436] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:17:13,456 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-22 16:17:13,457 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2021-11-22 16:17:13,457 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933238938] [2021-11-22 16:17:13,457 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-22 16:17:13,458 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-22 16:17:13,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 16:17:13,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-22 16:17:13,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=281, Unknown=0, NotChecked=0, Total=380 [2021-11-22 16:17:13,459 INFO L87 Difference]: Start difference. First operand 55 states and 62 transitions. Second operand has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 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) [2021-11-22 16:17:14,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:17:14,355 INFO L93 Difference]: Finished difference Result 122 states and 142 transitions. [2021-11-22 16:17:14,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-22 16:17:14,356 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 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 39 [2021-11-22 16:17:14,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:17:14,357 INFO L225 Difference]: With dead ends: 122 [2021-11-22 16:17:14,357 INFO L226 Difference]: Without dead ends: 89 [2021-11-22 16:17:14,358 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=212, Invalid=544, Unknown=0, NotChecked=0, Total=756 [2021-11-22 16:17:14,359 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 159 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 441 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-22 16:17:14,359 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 54 Invalid, 441 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-22 16:17:14,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-22 16:17:14,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 46. [2021-11-22 16:17:14,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.1111111111111112) internal successors, (50), 45 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:17:14,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-11-22 16:17:14,369 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 39 [2021-11-22 16:17:14,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:17:14,370 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-11-22 16:17:14,370 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 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) [2021-11-22 16:17:14,370 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-11-22 16:17:14,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-22 16:17:14,371 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:17:14,372 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:17:14,384 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (9)] Ended with exit code 0 [2021-11-22 16:17:14,583 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 16:17:14,584 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:17:14,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:17:14,584 INFO L85 PathProgramCache]: Analyzing trace with hash -604138262, now seen corresponding path program 5 times [2021-11-22 16:17:14,585 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 16:17:14,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1180316377] [2021-11-22 16:17:14,585 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-22 16:17:14,585 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 16:17:14,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 16:17:14,586 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 16:17:14,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-22 16:17:23,648 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-22 16:17:23,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:17:23,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-22 16:17:23,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:17:23,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-22 16:17:23,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:17:23,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-22 16:17:23,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:17:23,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:17:23,924 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 16:17:23,927 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-22 16:17:23,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 35 [2021-11-22 16:17:26,405 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-22 16:17:26,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 79 treesize of output 43 [2021-11-22 16:17:26,661 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 16:17:26,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:17:33,587 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-22 16:17:33,587 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 16:17:33,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1180316377] [2021-11-22 16:17:33,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1180316377] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:17:33,587 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-22 16:17:33,587 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 15] total 34 [2021-11-22 16:17:33,588 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679728323] [2021-11-22 16:17:33,588 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-22 16:17:33,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-22 16:17:33,589 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 16:17:33,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-22 16:17:33,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=1022, Unknown=0, NotChecked=0, Total=1122 [2021-11-22 16:17:33,601 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 34 states, 34 states have (on average 2.4411764705882355) internal successors, (83), 34 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:17:35,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:17:35,009 INFO L93 Difference]: Finished difference Result 108 states and 119 transitions. [2021-11-22 16:17:35,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-22 16:17:35,009 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.4411764705882355) internal successors, (83), 34 states have internal predecessors, (83), 0 states have call successors, (0), 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 [2021-11-22 16:17:35,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:17:35,012 INFO L225 Difference]: With dead ends: 108 [2021-11-22 16:17:35,012 INFO L226 Difference]: Without dead ends: 104 [2021-11-22 16:17:35,013 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 51 SyntacticMatches, 6 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=111, Invalid=1149, Unknown=0, NotChecked=0, Total=1260 [2021-11-22 16:17:35,014 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 12 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 173 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-22 16:17:35,015 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 170 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 81 Invalid, 0 Unknown, 173 Unchecked, 0.4s Time] [2021-11-22 16:17:35,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-22 16:17:35,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 67. [2021-11-22 16:17:35,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.121212121212121) internal successors, (74), 66 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:17:35,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 74 transitions. [2021-11-22 16:17:35,034 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 74 transitions. Word has length 45 [2021-11-22 16:17:35,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:17:35,034 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 74 transitions. [2021-11-22 16:17:35,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.4411764705882355) internal successors, (83), 34 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:17:35,035 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 74 transitions. [2021-11-22 16:17:35,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-22 16:17:35,037 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:17:35,037 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:17:35,052 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-22 16:17:35,240 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 16:17:35,241 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:17:35,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:17:35,241 INFO L85 PathProgramCache]: Analyzing trace with hash -703050612, now seen corresponding path program 6 times [2021-11-22 16:17:35,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 16:17:35,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1733385899] [2021-11-22 16:17:35,242 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-22 16:17:35,242 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 16:17:35,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 16:17:35,243 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 16:17:35,245 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-22 16:17:35,384 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-22 16:17:35,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:17:35,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-22 16:17:35,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:17:35,910 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 7 proven. 27 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-22 16:17:35,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:17:36,389 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 7 proven. 18 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-22 16:17:36,389 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 16:17:36,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1733385899] [2021-11-22 16:17:36,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1733385899] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:17:36,390 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-22 16:17:36,390 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 11] total 24 [2021-11-22 16:17:36,390 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536997244] [2021-11-22 16:17:36,390 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-22 16:17:36,391 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-22 16:17:36,391 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 16:17:36,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-22 16:17:36,392 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2021-11-22 16:17:36,393 INFO L87 Difference]: Start difference. First operand 67 states and 74 transitions. Second operand has 24 states, 24 states have (on average 2.7916666666666665) internal successors, (67), 24 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) [2021-11-22 16:17:37,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:17:37,727 INFO L93 Difference]: Finished difference Result 125 states and 138 transitions. [2021-11-22 16:17:37,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-22 16:17:37,728 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.7916666666666665) internal successors, (67), 24 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 47 [2021-11-22 16:17:37,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:17:37,729 INFO L225 Difference]: With dead ends: 125 [2021-11-22 16:17:37,729 INFO L226 Difference]: Without dead ends: 79 [2021-11-22 16:17:37,730 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=133, Invalid=569, Unknown=0, NotChecked=0, Total=702 [2021-11-22 16:17:37,731 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 91 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 763 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 844 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 763 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-22 16:17:37,731 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 74 Invalid, 844 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 763 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-22 16:17:37,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-22 16:17:37,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 68. [2021-11-22 16:17:37,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.1044776119402986) internal successors, (74), 67 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:17:37,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 74 transitions. [2021-11-22 16:17:37,759 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 74 transitions. Word has length 47 [2021-11-22 16:17:37,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:17:37,762 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 74 transitions. [2021-11-22 16:17:37,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.7916666666666665) internal successors, (67), 24 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) [2021-11-22 16:17:37,763 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 74 transitions. [2021-11-22 16:17:37,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-22 16:17:37,764 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:17:37,765 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:17:37,781 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-22 16:17:37,980 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 16:17:37,980 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:17:37,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:17:37,981 INFO L85 PathProgramCache]: Analyzing trace with hash -41974836, now seen corresponding path program 7 times [2021-11-22 16:17:37,981 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 16:17:37,982 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [497855120] [2021-11-22 16:17:37,982 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-22 16:17:37,982 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 16:17:37,982 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 16:17:37,984 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 16:17:38,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-22 16:17:38,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 16:17:38,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-22 16:17:38,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:17:38,471 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 7 proven. 18 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-22 16:17:38,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:17:39,163 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 7 proven. 18 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-22 16:17:39,164 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 16:17:39,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [497855120] [2021-11-22 16:17:39,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [497855120] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:17:39,164 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-22 16:17:39,165 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2021-11-22 16:17:39,165 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794968072] [2021-11-22 16:17:39,165 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-22 16:17:39,166 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-22 16:17:39,166 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 16:17:39,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-22 16:17:39,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=354, Unknown=0, NotChecked=0, Total=462 [2021-11-22 16:17:39,168 INFO L87 Difference]: Start difference. First operand 68 states and 74 transitions. Second operand has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 22 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:17:39,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:17:39,974 INFO L93 Difference]: Finished difference Result 129 states and 141 transitions. [2021-11-22 16:17:39,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-22 16:17:39,975 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 22 states have internal predecessors, (51), 0 states have call successors, (0), 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 [2021-11-22 16:17:39,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:17:39,976 INFO L225 Difference]: With dead ends: 129 [2021-11-22 16:17:39,977 INFO L226 Difference]: Without dead ends: 71 [2021-11-22 16:17:39,978 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=202, Invalid=610, Unknown=0, NotChecked=0, Total=812 [2021-11-22 16:17:39,978 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 87 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-22 16:17:39,979 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 47 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-22 16:17:39,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-22 16:17:39,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2021-11-22 16:17:39,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.1014492753623188) internal successors, (76), 69 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) [2021-11-22 16:17:39,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 76 transitions. [2021-11-22 16:17:39,995 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 76 transitions. Word has length 47 [2021-11-22 16:17:39,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:17:39,995 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 76 transitions. [2021-11-22 16:17:39,996 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 22 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:17:39,996 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 76 transitions. [2021-11-22 16:17:39,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-22 16:17:39,997 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:17:39,997 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:17:40,011 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (12)] Ended with exit code 0 [2021-11-22 16:17:40,210 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 16:17:40,213 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:17:40,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:17:40,213 INFO L85 PathProgramCache]: Analyzing trace with hash 1992374766, now seen corresponding path program 8 times [2021-11-22 16:17:40,214 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 16:17:40,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [338179751] [2021-11-22 16:17:40,214 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-22 16:17:40,214 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 16:17:40,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 16:17:40,215 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 16:17:40,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-22 16:17:40,347 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-22 16:17:40,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 16:17:40,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-22 16:17:40,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 16:17:40,685 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-22 16:17:40,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 16:17:41,359 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-22 16:17:41,359 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 16:17:41,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [338179751] [2021-11-22 16:17:41,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [338179751] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 16:17:41,360 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-22 16:17:41,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 21 [2021-11-22 16:17:41,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152085110] [2021-11-22 16:17:41,360 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-22 16:17:41,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-22 16:17:41,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 16:17:41,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-22 16:17:41,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=322, Unknown=0, NotChecked=0, Total=420 [2021-11-22 16:17:41,362 INFO L87 Difference]: Start difference. First operand 70 states and 76 transitions. Second operand has 21 states, 21 states have (on average 2.4285714285714284) internal successors, (51), 21 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:17:42,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 16:17:42,060 INFO L93 Difference]: Finished difference Result 81 states and 87 transitions. [2021-11-22 16:17:42,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-22 16:17:42,061 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.4285714285714284) internal successors, (51), 21 states have internal predecessors, (51), 0 states have call successors, (0), 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 49 [2021-11-22 16:17:42,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 16:17:42,062 INFO L225 Difference]: With dead ends: 81 [2021-11-22 16:17:42,062 INFO L226 Difference]: Without dead ends: 61 [2021-11-22 16:17:42,063 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=120, Invalid=386, Unknown=0, NotChecked=0, Total=506 [2021-11-22 16:17:42,064 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 71 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 489 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 559 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-22 16:17:42,064 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 56 Invalid, 559 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 489 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-22 16:17:42,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-22 16:17:42,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 56. [2021-11-22 16:17:42,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 55 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) [2021-11-22 16:17:42,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2021-11-22 16:17:42,088 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 49 [2021-11-22 16:17:42,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 16:17:42,088 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2021-11-22 16:17:42,089 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.4285714285714284) internal successors, (51), 21 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 16:17:42,089 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2021-11-22 16:17:42,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-22 16:17:42,091 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 16:17:42,091 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 16:17:42,109 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-22 16:17:42,304 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 16:17:42,305 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 16:17:42,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 16:17:42,305 INFO L85 PathProgramCache]: Analyzing trace with hash -2047700076, now seen corresponding path program 9 times [2021-11-22 16:17:42,305 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 16:17:42,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [962205136] [2021-11-22 16:17:42,306 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-22 16:17:42,306 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 16:17:42,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 16:17:42,309 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 16:17:42,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06faaef7-36cf-4562-9024-38a3d097442d/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process