./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/bitvector/num_conversion_2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/bitvector/num_conversion_2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7e0da033eb6b5a3b4db0394198751cf880534ee28b64f0bd7b196bfba1d785e1 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 22:46:53,837 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 22:46:53,839 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 22:46:53,873 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 22:46:53,874 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 22:46:53,875 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 22:46:53,877 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 22:46:53,879 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 22:46:53,881 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 22:46:53,882 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 22:46:53,883 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 22:46:53,884 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 22:46:53,885 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 22:46:53,886 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 22:46:53,888 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 22:46:53,889 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 22:46:53,890 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 22:46:53,891 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 22:46:53,893 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 22:46:53,895 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 22:46:53,897 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 22:46:53,898 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 22:46:53,900 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 22:46:53,900 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 22:46:53,904 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 22:46:53,904 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 22:46:53,905 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 22:46:53,906 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 22:46:53,906 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 22:46:53,908 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 22:46:53,908 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 22:46:53,909 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 22:46:53,910 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 22:46:53,911 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 22:46:53,912 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 22:46:53,912 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 22:46:53,913 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 22:46:53,913 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 22:46:53,914 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 22:46:53,915 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 22:46:53,915 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 22:46:53,916 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 22:46:53,940 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 22:46:53,941 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 22:46:53,941 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 22:46:53,941 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 22:46:53,942 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 22:46:53,942 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 22:46:53,942 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 22:46:53,943 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 22:46:53,943 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 22:46:53,943 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 22:46:53,943 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 22:46:53,944 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 22:46:53,944 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 22:46:53,944 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 22:46:53,944 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 22:46:53,944 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 22:46:53,945 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 22:46:53,945 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 22:46:53,946 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 22:46:53,946 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 22:46:53,946 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 22:46:53,946 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 22:46:53,946 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 22:46:53,947 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 22:46:53,947 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 22:46:53,947 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 22:46:53,947 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 22:46:53,947 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 22:46:53,948 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 22:46:53,948 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 22:46:53,948 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 22:46:53,948 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 22:46:53,949 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 22:46:53,949 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 22:46:53,949 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 22:46:53,949 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 22:46:53,950 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 22:46:53,950 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 22:46:53,950 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 22:46:53,950 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 22:46:53,950 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 22:46:53,951 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7e0da033eb6b5a3b4db0394198751cf880534ee28b64f0bd7b196bfba1d785e1 [2021-11-20 22:46:54,193 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 22:46:54,214 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 22:46:54,216 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 22:46:54,217 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 22:46:54,218 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 22:46:54,220 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/bitvector/num_conversion_2.c [2021-11-20 22:46:54,283 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/data/098d0c09f/e8b9b6b80385465dbd87f71d7f0bd58b/FLAGbaf355847 [2021-11-20 22:46:54,687 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 22:46:54,687 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/sv-benchmarks/c/bitvector/num_conversion_2.c [2021-11-20 22:46:54,696 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/data/098d0c09f/e8b9b6b80385465dbd87f71d7f0bd58b/FLAGbaf355847 [2021-11-20 22:46:55,096 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/data/098d0c09f/e8b9b6b80385465dbd87f71d7f0bd58b [2021-11-20 22:46:55,099 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 22:46:55,101 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 22:46:55,102 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 22:46:55,103 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 22:46:55,106 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 22:46:55,107 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:46:55" (1/1) ... [2021-11-20 22:46:55,108 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@35e37ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:46:55, skipping insertion in model container [2021-11-20 22:46:55,109 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:46:55" (1/1) ... [2021-11-20 22:46:55,116 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 22:46:55,131 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 22:46:55,310 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_62a7dfad-e26a-4c18-9e81-388a15d4a1da/sv-benchmarks/c/bitvector/num_conversion_2.c[685,698] [2021-11-20 22:46:55,325 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 22:46:55,332 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 22:46:55,344 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_62a7dfad-e26a-4c18-9e81-388a15d4a1da/sv-benchmarks/c/bitvector/num_conversion_2.c[685,698] [2021-11-20 22:46:55,354 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 22:46:55,369 INFO L208 MainTranslator]: Completed translation [2021-11-20 22:46:55,370 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:46:55 WrapperNode [2021-11-20 22:46:55,370 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 22:46:55,371 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 22:46:55,371 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 22:46:55,372 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 22:46:55,380 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:46:55" (1/1) ... [2021-11-20 22:46:55,386 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:46:55" (1/1) ... [2021-11-20 22:46:55,405 INFO L137 Inliner]: procedures = 13, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 34 [2021-11-20 22:46:55,406 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 22:46:55,408 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 22:46:55,408 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 22:46:55,408 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 22:46:55,416 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:46:55" (1/1) ... [2021-11-20 22:46:55,417 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:46:55" (1/1) ... [2021-11-20 22:46:55,421 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:46:55" (1/1) ... [2021-11-20 22:46:55,422 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:46:55" (1/1) ... [2021-11-20 22:46:55,431 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:46:55" (1/1) ... [2021-11-20 22:46:55,437 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:46:55" (1/1) ... [2021-11-20 22:46:55,446 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:46:55" (1/1) ... [2021-11-20 22:46:55,448 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 22:46:55,455 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 22:46:55,455 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 22:46:55,455 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 22:46:55,459 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:46:55" (1/1) ... [2021-11-20 22:46:55,466 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 22:46:55,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:46:55,494 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 22:46:55,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 22:46:55,540 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 22:46:55,541 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 22:46:55,541 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 22:46:55,541 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 22:46:55,606 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 22:46:55,608 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 22:46:55,725 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 22:46:55,748 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 22:46:55,749 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-20 22:46:55,751 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:46:55 BoogieIcfgContainer [2021-11-20 22:46:55,751 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 22:46:55,753 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 22:46:55,753 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 22:46:55,757 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 22:46:55,757 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 10:46:55" (1/3) ... [2021-11-20 22:46:55,758 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4579ba36 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:46:55, skipping insertion in model container [2021-11-20 22:46:55,758 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:46:55" (2/3) ... [2021-11-20 22:46:55,758 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4579ba36 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:46:55, skipping insertion in model container [2021-11-20 22:46:55,759 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:46:55" (3/3) ... [2021-11-20 22:46:55,760 INFO L111 eAbstractionObserver]: Analyzing ICFG num_conversion_2.c [2021-11-20 22:46:55,765 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 22:46:55,765 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 22:46:55,813 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 22:46:55,820 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=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-20 22:46:55,821 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 22:46:55,834 INFO L276 IsEmpty]: Start isEmpty. Operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:46:55,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-20 22:46:55,839 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:46:55,840 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-20 22:46:55,840 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:46:55,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:46:55,846 INFO L85 PathProgramCache]: Analyzing trace with hash 2065991, now seen corresponding path program 1 times [2021-11-20 22:46:55,855 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:46:55,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966409088] [2021-11-20 22:46:55,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:46:55,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:46:55,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:46:56,034 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:46:56,035 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:46:56,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966409088] [2021-11-20 22:46:56,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [966409088] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:46:56,036 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:46:56,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 22:46:56,038 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181564752] [2021-11-20 22:46:56,039 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:46:56,043 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:46:56,043 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:46:56,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:46:56,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:46:56,073 INFO L87 Difference]: Start difference. First operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 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 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:46:56,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:46:56,101 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2021-11-20 22:46:56,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:46:56,103 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 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 4 [2021-11-20 22:46:56,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:46:56,110 INFO L225 Difference]: With dead ends: 13 [2021-11-20 22:46:56,110 INFO L226 Difference]: Without dead ends: 6 [2021-11-20 22:46:56,112 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:46:56,117 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:46:56,118 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:46:56,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2021-11-20 22:46:56,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2021-11-20 22:46:56,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:46:56,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2021-11-20 22:46:56,150 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2021-11-20 22:46:56,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:46:56,151 INFO L470 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2021-11-20 22:46:56,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:46:56,151 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2021-11-20 22:46:56,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-20 22:46:56,152 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:46:56,152 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-20 22:46:56,152 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 22:46:56,153 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:46:56,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:46:56,154 INFO L85 PathProgramCache]: Analyzing trace with hash 64150435, now seen corresponding path program 1 times [2021-11-20 22:46:56,154 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:46:56,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1849781539] [2021-11-20 22:46:56,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:46:56,155 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:46:56,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:46:56,241 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:46:56,241 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:46:56,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1849781539] [2021-11-20 22:46:56,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1849781539] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:46:56,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1489523290] [2021-11-20 22:46:56,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:46:56,243 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:46:56,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:46:56,246 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:46:56,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 22:46:56,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:46:56,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 22:46:56,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:46:56,344 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:46:56,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:46:56,392 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:46:56,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1489523290] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:46:56,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1152397985] [2021-11-20 22:46:56,414 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-20 22:46:56,415 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:46:56,419 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:46:56,425 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:46:56,425 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:46:57,162 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:46:57,260 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:46:57,261 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:46:57,262 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-20 22:46:57,263 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675331406] [2021-11-20 22:46:57,266 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:46:57,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 22:46:57,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:46:57,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 22:46:57,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-20 22:46:57,270 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:46:57,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:46:57,321 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2021-11-20 22:46:57,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-20 22:46:57,329 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 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 5 [2021-11-20 22:46:57,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:46:57,330 INFO L225 Difference]: With dead ends: 12 [2021-11-20 22:46:57,330 INFO L226 Difference]: Without dead ends: 9 [2021-11-20 22:46:57,330 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2021-11-20 22:46:57,332 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 2 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:46:57,332 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 8 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:46:57,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-20 22:46:57,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-11-20 22:46:57,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:46:57,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2021-11-20 22:46:57,336 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2021-11-20 22:46:57,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:46:57,336 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2021-11-20 22:46:57,336 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:46:57,342 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2021-11-20 22:46:57,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-20 22:46:57,342 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:46:57,343 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2021-11-20 22:46:57,378 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 22:46:57,543 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:46:57,544 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:46:57,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:46:57,544 INFO L85 PathProgramCache]: Analyzing trace with hash -50856633, now seen corresponding path program 2 times [2021-11-20 22:46:57,545 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:46:57,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1434116707] [2021-11-20 22:46:57,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:46:57,545 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:46:57,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:46:57,735 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:46:57,736 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:46:57,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1434116707] [2021-11-20 22:46:57,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1434116707] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:46:57,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1230084776] [2021-11-20 22:46:57,742 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:46:57,742 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:46:57,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:46:57,746 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:46:57,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 22:46:57,812 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 22:46:57,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:46:57,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-20 22:46:57,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:46:57,876 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:46:57,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:46:58,063 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:46:58,063 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1230084776] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:46:58,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [221316751] [2021-11-20 22:46:58,067 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-20 22:46:58,067 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:46:58,067 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:46:58,068 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:46:58,068 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:46:58,464 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:46:58,598 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 22:46:58,598 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:46:58,598 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 15 [2021-11-20 22:46:58,598 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051871105] [2021-11-20 22:46:58,598 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 22:46:58,599 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-20 22:46:58,599 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:46:58,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-20 22:46:58,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=242, Unknown=0, NotChecked=0, Total=342 [2021-11-20 22:46:58,601 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand has 16 states, 16 states have (on average 1.1875) internal successors, (19), 15 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) [2021-11-20 22:46:59,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:46:59,052 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2021-11-20 22:46:59,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 22:46:59,053 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.1875) internal successors, (19), 15 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 8 [2021-11-20 22:46:59,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:46:59,054 INFO L225 Difference]: With dead ends: 18 [2021-11-20 22:46:59,054 INFO L226 Difference]: Without dead ends: 15 [2021-11-20 22:46:59,055 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=156, Invalid=350, Unknown=0, NotChecked=0, Total=506 [2021-11-20 22:46:59,056 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 9 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:46:59,057 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 8 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:46:59,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-20 22:46:59,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-20 22:46:59,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:46:59,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-11-20 22:46:59,061 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 8 [2021-11-20 22:46:59,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:46:59,061 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-11-20 22:46:59,062 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.1875) internal successors, (19), 15 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) [2021-11-20 22:46:59,062 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-11-20 22:46:59,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-20 22:46:59,062 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:46:59,063 INFO L514 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1] [2021-11-20 22:46:59,106 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 22:46:59,277 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:46:59,277 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:46:59,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:46:59,277 INFO L85 PathProgramCache]: Analyzing trace with hash 1522332743, now seen corresponding path program 3 times [2021-11-20 22:46:59,278 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:46:59,278 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [127504873] [2021-11-20 22:46:59,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:46:59,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:46:59,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-20 22:46:59,344 INFO L355 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-20 22:46:59,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-20 22:46:59,429 INFO L133 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-11-20 22:46:59,429 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-11-20 22:46:59,430 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-20 22:46:59,435 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-20 22:46:59,438 INFO L732 BasicCegarLoop]: Path program histogram: [3, 1] [2021-11-20 22:46:59,440 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-20 22:46:59,465 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.11 10:46:59 BoogieIcfgContainer [2021-11-20 22:46:59,465 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-20 22:46:59,466 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-20 22:46:59,466 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-20 22:46:59,466 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-20 22:46:59,466 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:46:55" (3/4) ... [2021-11-20 22:46:59,469 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-11-20 22:46:59,469 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-20 22:46:59,470 INFO L158 Benchmark]: Toolchain (without parser) took 4369.10ms. Allocated memory was 115.3MB in the beginning and 138.4MB in the end (delta: 23.1MB). Free memory was 74.2MB in the beginning and 78.9MB in the end (delta: -4.6MB). Peak memory consumption was 16.7MB. Max. memory is 16.1GB. [2021-11-20 22:46:59,470 INFO L158 Benchmark]: CDTParser took 0.23ms. Allocated memory is still 115.3MB. Free memory is still 91.3MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-20 22:46:59,471 INFO L158 Benchmark]: CACSL2BoogieTranslator took 267.88ms. Allocated memory is still 115.3MB. Free memory was 74.0MB in the beginning and 90.1MB in the end (delta: -16.1MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-20 22:46:59,471 INFO L158 Benchmark]: Boogie Procedure Inliner took 35.86ms. Allocated memory is still 115.3MB. Free memory was 90.1MB in the beginning and 88.7MB in the end (delta: 1.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-20 22:46:59,471 INFO L158 Benchmark]: Boogie Preprocessor took 46.25ms. Allocated memory is still 115.3MB. Free memory was 88.7MB in the beginning and 87.7MB in the end (delta: 1.0MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-20 22:46:59,472 INFO L158 Benchmark]: RCFGBuilder took 296.83ms. Allocated memory is still 115.3MB. Free memory was 87.7MB in the beginning and 77.9MB in the end (delta: 9.8MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-20 22:46:59,472 INFO L158 Benchmark]: TraceAbstraction took 3712.12ms. Allocated memory was 115.3MB in the beginning and 138.4MB in the end (delta: 23.1MB). Free memory was 77.6MB in the beginning and 79.9MB in the end (delta: -2.3MB). Peak memory consumption was 23.4MB. Max. memory is 16.1GB. [2021-11-20 22:46:59,473 INFO L158 Benchmark]: Witness Printer took 3.75ms. Allocated memory is still 138.4MB. Free memory was 79.9MB in the beginning and 78.9MB in the end (delta: 1.0MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-20 22:46:59,475 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23ms. Allocated memory is still 115.3MB. Free memory is still 91.3MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 267.88ms. Allocated memory is still 115.3MB. Free memory was 74.0MB in the beginning and 90.1MB in the end (delta: -16.1MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 35.86ms. Allocated memory is still 115.3MB. Free memory was 90.1MB in the beginning and 88.7MB in the end (delta: 1.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 46.25ms. Allocated memory is still 115.3MB. Free memory was 88.7MB in the beginning and 87.7MB in the end (delta: 1.0MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 296.83ms. Allocated memory is still 115.3MB. Free memory was 87.7MB in the beginning and 77.9MB in the end (delta: 9.8MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 3712.12ms. Allocated memory was 115.3MB in the beginning and 138.4MB in the end (delta: 23.1MB). Free memory was 77.6MB in the beginning and 79.9MB in the end (delta: -2.3MB). Peak memory consumption was 23.4MB. Max. memory is 16.1GB. * Witness Printer took 3.75ms. Allocated memory is still 138.4MB. Free memory was 79.9MB in the beginning and 78.9MB in the end (delta: 1.0MB). There was no memory consumed. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 16]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of shiftLeft at line 31, overapproximation of bitwiseAnd at line 32. Possible FailurePath: [L24] unsigned char x = __VERIFIER_nondet_uchar(); [L25] unsigned char y; [L26] unsigned char c; [L28] y = 0 [L29] c = 0 VAL [c=0, y=0] [L30] COND TRUE c < (unsigned char)8 [L31] unsigned char i = ((unsigned char)1) << c; [L32] unsigned char bit = x & i; [L33] COND TRUE bit != (unsigned char)0 [L34] y = y + i [L36] c = c + ((unsigned char)1) VAL [bit=1, c=1, i=0, y=0] [L30] COND TRUE c < (unsigned char)8 [L31] unsigned char i = ((unsigned char)1) << c; [L32] unsigned char bit = x & i; [L33] COND TRUE bit != (unsigned char)0 [L34] y = y + i [L36] c = c + ((unsigned char)1) VAL [bit=1, c=2, i=0, y=0] [L30] COND TRUE c < (unsigned char)8 [L31] unsigned char i = ((unsigned char)1) << c; [L32] unsigned char bit = x & i; [L33] COND TRUE bit != (unsigned char)0 [L34] y = y + i [L36] c = c + ((unsigned char)1) VAL [bit=1, c=3, i=0, y=0] [L30] COND TRUE c < (unsigned char)8 [L31] unsigned char i = ((unsigned char)1) << c; [L32] unsigned char bit = x & i; [L33] COND FALSE !(bit != (unsigned char)0) [L36] c = c + ((unsigned char)1) VAL [bit=0, c=4, i=0, y=0] [L30] COND TRUE c < (unsigned char)8 [L31] unsigned char i = ((unsigned char)1) << c; [L32] unsigned char bit = x & i; [L33] COND TRUE bit != (unsigned char)0 [L34] y = y + i [L36] c = c + ((unsigned char)1) VAL [bit=1, c=5, i=0, y=0] [L30] COND TRUE c < (unsigned char)8 [L31] unsigned char i = ((unsigned char)1) << c; [L32] unsigned char bit = x & i; [L33] COND TRUE bit != (unsigned char)0 [L34] y = y + i [L36] c = c + ((unsigned char)1) VAL [bit=1, c=6, i=0, y=0] [L30] COND TRUE c < (unsigned char)8 [L31] unsigned char i = ((unsigned char)1) << c; [L32] unsigned char bit = x & i; [L33] COND TRUE bit != (unsigned char)0 [L34] y = y + i [L36] c = c + ((unsigned char)1) VAL [bit=1, c=7, i=0, y=0] [L30] COND TRUE c < (unsigned char)8 [L31] unsigned char i = ((unsigned char)1) << c; [L32] unsigned char bit = x & i; [L33] COND FALSE !(bit != (unsigned char)0) [L36] c = c + ((unsigned char)1) VAL [bit=0, c=8, i=0, y=0] [L30] COND FALSE !(c < (unsigned char)8) [L38] CALL __VERIFIER_assert(x == y) [L15] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L16] reach_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 7 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 3.6s, OverallIterations: 4, TraceHistogramMax: 8, PathProgramHistogramMax: 3, EmptinessCheckTime: 0.0s, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 11 SdHoareTripleChecker+Valid, 0.1s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 11 mSDsluCounter, 22 SdHoareTripleChecker+Invalid, 0.1s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 16 mSDsCounter, 19 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 57 IncrementalHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 19 mSolverCounterUnsat, 7 mSDtfsCounter, 57 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 51 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 0.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=15occurred in iteration=3, InterpolantAutomatonStates: 23, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.6s InterpolantComputationTime, 42 NumberOfCodeBlocks, 42 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 36 ConstructedInterpolants, 0 QuantifiedInterpolants, 234 SizeOfPredicates, 3 NumberOfNonLiveVariables, 94 ConjunctsInSsa, 22 ConjunctsInUnsatCore, 7 InterpolantComputations, 1 PerfectInterpolantSequences, 0/33 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2021-11-20 22:46:59,494 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 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_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/bitvector/num_conversion_2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7e0da033eb6b5a3b4db0394198751cf880534ee28b64f0bd7b196bfba1d785e1 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 22:47:01,929 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 22:47:01,932 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 22:47:01,967 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 22:47:01,968 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 22:47:01,969 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 22:47:01,971 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 22:47:01,974 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 22:47:01,976 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 22:47:01,978 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 22:47:01,979 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 22:47:01,980 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 22:47:01,981 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 22:47:01,983 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 22:47:01,984 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 22:47:01,986 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 22:47:01,987 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 22:47:01,988 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 22:47:01,990 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 22:47:01,993 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 22:47:01,995 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 22:47:01,996 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 22:47:01,998 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 22:47:01,999 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 22:47:02,003 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 22:47:02,003 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 22:47:02,004 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 22:47:02,005 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 22:47:02,005 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 22:47:02,013 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 22:47:02,014 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 22:47:02,015 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 22:47:02,016 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 22:47:02,017 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 22:47:02,019 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 22:47:02,019 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 22:47:02,020 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 22:47:02,021 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 22:47:02,021 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 22:47:02,022 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 22:47:02,023 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 22:47:02,024 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-20 22:47:02,052 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 22:47:02,052 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 22:47:02,052 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 22:47:02,053 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 22:47:02,053 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 22:47:02,054 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 22:47:02,054 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 22:47:02,054 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 22:47:02,054 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 22:47:02,055 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 22:47:02,055 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 22:47:02,055 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 22:47:02,056 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 22:47:02,056 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 22:47:02,057 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 22:47:02,057 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 22:47:02,057 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 22:47:02,057 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 22:47:02,057 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 22:47:02,058 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-20 22:47:02,058 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-20 22:47:02,058 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 22:47:02,058 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 22:47:02,059 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 22:47:02,059 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 22:47:02,059 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 22:47:02,059 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-20 22:47:02,060 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 22:47:02,060 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 22:47:02,060 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 22:47:02,060 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 22:47:02,061 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 22:47:02,061 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-20 22:47:02,061 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-20 22:47:02,061 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 22:47:02,061 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 22:47:02,062 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 22:47:02,062 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_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7e0da033eb6b5a3b4db0394198751cf880534ee28b64f0bd7b196bfba1d785e1 [2021-11-20 22:47:02,468 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 22:47:02,489 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 22:47:02,492 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 22:47:02,493 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 22:47:02,494 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 22:47:02,496 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/bitvector/num_conversion_2.c [2021-11-20 22:47:02,576 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/data/7362b760d/e7df2e4745334496ba5fe246bf2df124/FLAG922f939c0 [2021-11-20 22:47:03,108 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 22:47:03,109 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/sv-benchmarks/c/bitvector/num_conversion_2.c [2021-11-20 22:47:03,116 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/data/7362b760d/e7df2e4745334496ba5fe246bf2df124/FLAG922f939c0 [2021-11-20 22:47:03,492 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/data/7362b760d/e7df2e4745334496ba5fe246bf2df124 [2021-11-20 22:47:03,496 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 22:47:03,499 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 22:47:03,509 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 22:47:03,510 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 22:47:03,514 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 22:47:03,515 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:47:03" (1/1) ... [2021-11-20 22:47:03,517 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e082e26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:03, skipping insertion in model container [2021-11-20 22:47:03,518 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:47:03" (1/1) ... [2021-11-20 22:47:03,529 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 22:47:03,545 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 22:47:03,734 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_62a7dfad-e26a-4c18-9e81-388a15d4a1da/sv-benchmarks/c/bitvector/num_conversion_2.c[685,698] [2021-11-20 22:47:03,756 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 22:47:03,766 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 22:47:03,796 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_62a7dfad-e26a-4c18-9e81-388a15d4a1da/sv-benchmarks/c/bitvector/num_conversion_2.c[685,698] [2021-11-20 22:47:03,811 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 22:47:03,841 INFO L208 MainTranslator]: Completed translation [2021-11-20 22:47:03,842 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:03 WrapperNode [2021-11-20 22:47:03,842 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 22:47:03,843 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 22:47:03,844 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 22:47:03,844 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 22:47:03,851 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:03" (1/1) ... [2021-11-20 22:47:03,859 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:03" (1/1) ... [2021-11-20 22:47:03,876 INFO L137 Inliner]: procedures = 13, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 34 [2021-11-20 22:47:03,876 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 22:47:03,877 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 22:47:03,877 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 22:47:03,878 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 22:47:03,885 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:03" (1/1) ... [2021-11-20 22:47:03,886 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:03" (1/1) ... [2021-11-20 22:47:03,899 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:03" (1/1) ... [2021-11-20 22:47:03,899 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:03" (1/1) ... [2021-11-20 22:47:03,912 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:03" (1/1) ... [2021-11-20 22:47:03,916 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:03" (1/1) ... [2021-11-20 22:47:03,918 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:03" (1/1) ... [2021-11-20 22:47:03,925 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 22:47:03,926 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 22:47:03,927 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 22:47:03,928 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 22:47:03,929 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:03" (1/1) ... [2021-11-20 22:47:03,936 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 22:47:03,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:47:03,964 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 22:47:03,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 22:47:04,016 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 22:47:04,017 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 22:47:04,017 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 22:47:04,017 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-20 22:47:04,096 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 22:47:04,097 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 22:47:04,234 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 22:47:04,240 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 22:47:04,244 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-20 22:47:04,246 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:47:04 BoogieIcfgContainer [2021-11-20 22:47:04,247 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 22:47:04,248 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 22:47:04,249 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 22:47:04,252 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 22:47:04,253 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 10:47:03" (1/3) ... [2021-11-20 22:47:04,254 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26f708da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:47:04, skipping insertion in model container [2021-11-20 22:47:04,254 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:47:03" (2/3) ... [2021-11-20 22:47:04,255 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26f708da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:47:04, skipping insertion in model container [2021-11-20 22:47:04,255 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:47:04" (3/3) ... [2021-11-20 22:47:04,257 INFO L111 eAbstractionObserver]: Analyzing ICFG num_conversion_2.c [2021-11-20 22:47:04,262 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 22:47:04,263 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 22:47:04,323 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 22:47:04,333 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=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-20 22:47:04,351 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 22:47:04,377 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:47:04,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-20 22:47:04,384 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:47:04,385 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-20 22:47:04,385 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:47:04,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:47:04,392 INFO L85 PathProgramCache]: Analyzing trace with hash 889968487, now seen corresponding path program 1 times [2021-11-20 22:47:04,403 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-20 22:47:04,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [509697775] [2021-11-20 22:47:04,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:04,406 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-20 22:47:04,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-20 22:47:04,409 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-20 22:47:04,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-20 22:47:04,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:04,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-20 22:47:04,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:47:04,543 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:04,544 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:47:04,562 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:04,562 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-20 22:47:04,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [509697775] [2021-11-20 22:47:04,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [509697775] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-20 22:47:04,564 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:47:04,564 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-20 22:47:04,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779304391] [2021-11-20 22:47:04,567 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-20 22:47:04,571 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-20 22:47:04,571 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-20 22:47:04,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-20 22:47:04,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-20 22:47:04,600 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:47:04,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:47:04,620 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2021-11-20 22:47:04,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-20 22:47:04,623 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 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 6 [2021-11-20 22:47:04,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:47:04,631 INFO L225 Difference]: With dead ends: 21 [2021-11-20 22:47:04,632 INFO L226 Difference]: Without dead ends: 9 [2021-11-20 22:47:04,634 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-20 22:47:04,641 INFO L933 BasicCegarLoop]: 14 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, 14 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:47:04,643 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:47:04,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-20 22:47:04,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-11-20 22:47:04,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:47:04,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2021-11-20 22:47:04,677 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2021-11-20 22:47:04,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:47:04,677 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2021-11-20 22:47:04,678 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:47:04,678 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2021-11-20 22:47:04,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-20 22:47:04,678 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:47:04,679 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-20 22:47:04,694 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2021-11-20 22:47:04,889 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-20 22:47:04,890 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:47:04,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:47:04,895 INFO L85 PathProgramCache]: Analyzing trace with hash 889640786, now seen corresponding path program 1 times [2021-11-20 22:47:04,896 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-20 22:47:04,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1050337283] [2021-11-20 22:47:04,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:04,897 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-20 22:47:04,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-20 22:47:04,898 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-20 22:47:04,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-20 22:47:04,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:04,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 22:47:04,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:47:05,021 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:05,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:47:05,050 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:05,050 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-20 22:47:05,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1050337283] [2021-11-20 22:47:05,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1050337283] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-20 22:47:05,057 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:47:05,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-20 22:47:05,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675940803] [2021-11-20 22:47:05,057 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-20 22:47:05,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 22:47:05,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-20 22:47:05,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 22:47:05,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 22:47:05,060 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:47:05,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:47:05,080 INFO L93 Difference]: Finished difference Result 17 states and 20 transitions. [2021-11-20 22:47:05,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 22:47:05,080 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 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 6 [2021-11-20 22:47:05,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:47:05,081 INFO L225 Difference]: With dead ends: 17 [2021-11-20 22:47:05,081 INFO L226 Difference]: Without dead ends: 13 [2021-11-20 22:47:05,082 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 22:47:05,083 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 9 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:47:05,084 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 14 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:47:05,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-20 22:47:05,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-20 22:47:05,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 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) [2021-11-20 22:47:05,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2021-11-20 22:47:05,089 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 6 [2021-11-20 22:47:05,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:47:05,089 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2021-11-20 22:47:05,089 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:47:05,090 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2021-11-20 22:47:05,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-20 22:47:05,090 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:47:05,091 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-20 22:47:05,104 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-20 22:47:05,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-20 22:47:05,301 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:47:05,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:47:05,302 INFO L85 PathProgramCache]: Analyzing trace with hash -1950053902, now seen corresponding path program 1 times [2021-11-20 22:47:05,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-20 22:47:05,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1315579305] [2021-11-20 22:47:05,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:05,303 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-20 22:47:05,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-20 22:47:05,304 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-20 22:47:05,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-20 22:47:05,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:05,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 22:47:05,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:47:05,420 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:05,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:47:05,488 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:05,488 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-20 22:47:05,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1315579305] [2021-11-20 22:47:05,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1315579305] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:47:05,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1352177595] [2021-11-20 22:47:05,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:05,490 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-20 22:47:05,490 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-20 22:47:05,507 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-20 22:47:05,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-11-20 22:47:05,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:05,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 22:47:05,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:47:05,652 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:05,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:47:05,711 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:05,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1352177595] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:47:05,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [708534523] [2021-11-20 22:47:05,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:05,712 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:47:05,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:47:05,714 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:47:05,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 22:47:05,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:05,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-20 22:47:05,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:47:05,804 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:05,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:47:05,934 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:05,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [708534523] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:47:05,935 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-20 22:47:05,935 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 6] total 10 [2021-11-20 22:47:05,935 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7581272] [2021-11-20 22:47:05,935 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-20 22:47:05,936 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-20 22:47:05,936 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-20 22:47:05,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-20 22:47:05,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-11-20 22:47:05,937 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 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) [2021-11-20 22:47:06,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:47:06,059 INFO L93 Difference]: Finished difference Result 29 states and 38 transitions. [2021-11-20 22:47:06,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 22:47:06,060 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-20 22:47:06,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:47:06,061 INFO L225 Difference]: With dead ends: 29 [2021-11-20 22:47:06,061 INFO L226 Difference]: Without dead ends: 25 [2021-11-20 22:47:06,062 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=93, Unknown=0, NotChecked=0, Total=156 [2021-11-20 22:47:06,063 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 38 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:47:06,064 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 47 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:47:06,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-20 22:47:06,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-11-20 22:47:06,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 24 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:47:06,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2021-11-20 22:47:06,071 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 12 [2021-11-20 22:47:06,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:47:06,071 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2021-11-20 22:47:06,071 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 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) [2021-11-20 22:47:06,072 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2021-11-20 22:47:06,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-20 22:47:06,073 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:47:06,073 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1] [2021-11-20 22:47:06,077 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (5)] Ended with exit code 0 [2021-11-20 22:47:06,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 22:47:06,481 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (4)] Ended with exit code 0 [2021-11-20 22:47:06,675 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-20 22:47:06,675 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:47:06,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:47:06,676 INFO L85 PathProgramCache]: Analyzing trace with hash -1786738894, now seen corresponding path program 2 times [2021-11-20 22:47:06,677 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-20 22:47:06,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1237530343] [2021-11-20 22:47:06,677 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 22:47:06,677 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-20 22:47:06,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-20 22:47:06,679 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-20 22:47:06,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-20 22:47:06,717 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 22:47:06,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:47:06,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 22:47:06,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:47:06,854 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:06,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:47:07,082 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:07,082 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-20 22:47:07,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1237530343] [2021-11-20 22:47:07,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1237530343] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:47:07,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [931573997] [2021-11-20 22:47:07,083 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 22:47:07,083 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-20 22:47:07,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-20 22:47:07,085 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-20 22:47:07,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (8)] Waiting until timeout for monitored process [2021-11-20 22:47:07,166 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 22:47:07,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:47:07,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 22:47:07,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:47:07,267 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:07,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:47:07,350 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:07,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [931573997] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:47:07,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1754842295] [2021-11-20 22:47:07,351 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 22:47:07,351 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:47:07,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:47:07,352 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:47:07,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 22:47:07,398 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 22:47:07,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:47:07,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-20 22:47:07,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:47:07,487 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:07,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:47:07,843 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:07,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1754842295] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:47:07,844 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-20 22:47:07,845 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 10] total 22 [2021-11-20 22:47:07,845 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573486119] [2021-11-20 22:47:07,845 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-20 22:47:07,846 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-20 22:47:07,846 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-20 22:47:07,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-20 22:47:07,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=329, Unknown=0, NotChecked=0, Total=462 [2021-11-20 22:47:07,848 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand has 22 states, 22 states have (on average 2.772727272727273) internal successors, (61), 22 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) [2021-11-20 22:47:08,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:47:08,347 INFO L93 Difference]: Finished difference Result 53 states and 74 transitions. [2021-11-20 22:47:08,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-20 22:47:08,348 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.772727272727273) internal successors, (61), 22 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 24 [2021-11-20 22:47:08,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:47:08,350 INFO L225 Difference]: With dead ends: 53 [2021-11-20 22:47:08,350 INFO L226 Difference]: Without dead ends: 49 [2021-11-20 22:47:08,350 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=248, Invalid=622, Unknown=0, NotChecked=0, Total=870 [2021-11-20 22:47:08,352 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 132 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:47:08,352 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 134 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:47:08,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-20 22:47:08,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-11-20 22:47:08,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.3333333333333333) internal successors, (64), 48 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:47:08,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 64 transitions. [2021-11-20 22:47:08,372 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 64 transitions. Word has length 24 [2021-11-20 22:47:08,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:47:08,373 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 64 transitions. [2021-11-20 22:47:08,373 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.772727272727273) internal successors, (61), 22 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) [2021-11-20 22:47:08,374 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 64 transitions. [2021-11-20 22:47:08,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 22:47:08,376 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:47:08,376 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1] [2021-11-20 22:47:08,415 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 22:47:08,603 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (8)] Ended with exit code 0 [2021-11-20 22:47:08,809 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (7)] Ended with exit code 0 [2021-11-20 22:47:09,002 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-20 22:47:09,003 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:47:09,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:47:09,004 INFO L85 PathProgramCache]: Analyzing trace with hash -1720528430, now seen corresponding path program 3 times [2021-11-20 22:47:09,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-20 22:47:09,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [389906291] [2021-11-20 22:47:09,004 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:47:09,004 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-20 22:47:09,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-20 22:47:09,006 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-20 22:47:09,009 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-20 22:47:09,050 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-20 22:47:09,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:47:09,052 WARN L261 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 22:47:09,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:47:12,408 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 40 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:12,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:47:16,209 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 9 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:16,210 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-20 22:47:16,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [389906291] [2021-11-20 22:47:16,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [389906291] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:47:16,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1710668939] [2021-11-20 22:47:16,211 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:47:16,211 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-20 22:47:16,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-20 22:47:16,220 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-20 22:47:16,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-20 22:47:16,298 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-20 22:47:16,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:47:16,301 WARN L261 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 22:47:16,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:47:17,417 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 40 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:17,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:47:18,781 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 9 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:18,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1710668939] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:47:18,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [363759492] [2021-11-20 22:47:18,782 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:47:18,782 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:47:18,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:47:18,783 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:47:18,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 22:47:18,826 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-20 22:47:18,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:47:18,828 WARN L261 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-20 22:47:18,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:47:21,409 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:21,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:47:24,384 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:24,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [363759492] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:47:24,385 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-20 22:47:24,385 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 29, 29] total 82 [2021-11-20 22:47:24,386 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644851277] [2021-11-20 22:47:24,386 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-20 22:47:24,387 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-20 22:47:24,387 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-20 22:47:24,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-20 22:47:24,392 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1741, Invalid=4901, Unknown=0, NotChecked=0, Total=6642 [2021-11-20 22:47:24,392 INFO L87 Difference]: Start difference. First operand 49 states and 64 transitions. Second operand has 82 states, 82 states have (on average 1.0731707317073171) internal successors, (88), 82 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) [2021-11-20 22:47:24,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:47:24,942 INFO L93 Difference]: Finished difference Result 96 states and 125 transitions. [2021-11-20 22:47:24,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-20 22:47:24,943 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 1.0731707317073171) internal successors, (88), 82 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) Word has length 30 [2021-11-20 22:47:24,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:47:24,944 INFO L225 Difference]: With dead ends: 96 [2021-11-20 22:47:24,944 INFO L226 Difference]: Without dead ends: 70 [2021-11-20 22:47:24,948 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 90 SyntacticMatches, 5 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 3592 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=2019, Invalid=5463, Unknown=0, NotChecked=0, Total=7482 [2021-11-20 22:47:24,949 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 21 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 34 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:47:24,950 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 76 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 171 Invalid, 0 Unknown, 34 Unchecked, 0.2s Time] [2021-11-20 22:47:24,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-20 22:47:24,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-11-20 22:47:24,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.318840579710145) internal successors, (91), 69 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:47:24,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 91 transitions. [2021-11-20 22:47:24,960 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 91 transitions. Word has length 30 [2021-11-20 22:47:24,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:47:24,961 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 91 transitions. [2021-11-20 22:47:24,961 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 1.0731707317073171) internal successors, (88), 82 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) [2021-11-20 22:47:24,962 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 91 transitions. [2021-11-20 22:47:24,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 22:47:24,963 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:47:24,963 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:47:24,981 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-20 22:47:25,194 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-20 22:47:25,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-20 22:47:25,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt [2021-11-20 22:47:25,574 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:47:25,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:47:25,575 INFO L85 PathProgramCache]: Analyzing trace with hash -1777786732, now seen corresponding path program 1 times [2021-11-20 22:47:25,575 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-20 22:47:25,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [280747902] [2021-11-20 22:47:25,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:25,576 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-20 22:47:25,576 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-20 22:47:25,577 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-20 22:47:25,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-20 22:47:25,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:25,601 WARN L261 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-20 22:47:25,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:47:26,731 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:26,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:47:30,157 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:30,157 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-20 22:47:30,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [280747902] [2021-11-20 22:47:30,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [280747902] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:47:30,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [618014860] [2021-11-20 22:47:30,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:30,159 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-20 22:47:30,159 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-20 22:47:30,166 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-20 22:47:30,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-20 22:47:30,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:30,262 WARN L261 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-20 22:47:30,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:47:30,855 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:30,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:47:31,532 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:31,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [618014860] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:47:31,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [20583911] [2021-11-20 22:47:31,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:47:31,533 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:47:31,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:47:31,546 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:47:31,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-20 22:47:31,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:47:31,587 WARN L261 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-20 22:47:31,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:47:32,567 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:32,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:47:37,699 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:47:37,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [20583911] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:47:37,699 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-20 22:47:37,699 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 29, 29] total 80 [2021-11-20 22:47:37,700 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678166261] [2021-11-20 22:47:37,700 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-20 22:47:37,701 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-20 22:47:37,701 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-20 22:47:37,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-20 22:47:37,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1214, Invalid=5106, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 22:47:37,704 INFO L87 Difference]: Start difference. First operand 70 states and 91 transitions. Second operand has 80 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) [2021-11-20 22:48:32,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:48:32,165 INFO L93 Difference]: Finished difference Result 377 states and 478 transitions. [2021-11-20 22:48:32,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 188 states. [2021-11-20 22:48:32,168 INFO L78 Accepts]: Start accepts. Automaton has has 80 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) Word has length 30 [2021-11-20 22:48:32,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:48:32,173 INFO L225 Difference]: With dead ends: 377 [2021-11-20 22:48:32,173 INFO L226 Difference]: Without dead ends: 365 [2021-11-20 22:48:32,187 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 100 SyntacticMatches, 8 SemanticMatches, 249 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20759 ImplicationChecksByTransitivity, 58.3s TimeCoverageRelationStatistics Valid=8413, Invalid=54337, Unknown=0, NotChecked=0, Total=62750 [2021-11-20 22:48:32,188 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 571 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 1969 mSolverCounterSat, 617 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 571 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 2867 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 617 IncrementalHoareTripleChecker+Valid, 1969 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 281 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2021-11-20 22:48:32,190 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [571 Valid, 166 Invalid, 2867 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [617 Valid, 1969 Invalid, 0 Unknown, 281 Unchecked, 3.7s Time] [2021-11-20 22:48:32,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2021-11-20 22:48:32,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 262. [2021-11-20 22:48:32,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 261 states have (on average 1.3524904214559388) internal successors, (353), 261 states have internal predecessors, (353), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:32,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 353 transitions. [2021-11-20 22:48:32,248 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 353 transitions. Word has length 30 [2021-11-20 22:48:32,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:48:32,248 INFO L470 AbstractCegarLoop]: Abstraction has 262 states and 353 transitions. [2021-11-20 22:48:32,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 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) [2021-11-20 22:48:32,249 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 353 transitions. [2021-11-20 22:48:32,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 22:48:32,251 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:48:32,251 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:48:32,272 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-20 22:48:32,453 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (14)] Ended with exit code 0 [2021-11-20 22:48:32,662 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-20 22:48:32,852 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-20 22:48:32,853 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:48:32,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:48:32,853 INFO L85 PathProgramCache]: Analyzing trace with hash 1894380496, now seen corresponding path program 2 times [2021-11-20 22:48:32,853 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-20 22:48:32,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2116091822] [2021-11-20 22:48:32,854 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 22:48:32,854 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-20 22:48:32,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-20 22:48:32,855 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-20 22:48:32,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-20 22:48:32,876 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 22:48:32,876 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:48:32,877 WARN L261 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-20 22:48:32,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:48:34,045 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:34,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:48:37,432 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 2 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:37,433 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-20 22:48:37,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2116091822] [2021-11-20 22:48:37,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2116091822] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:48:37,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1040631530] [2021-11-20 22:48:37,433 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 22:48:37,433 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-20 22:48:37,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-20 22:48:37,436 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-20 22:48:37,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-20 22:48:37,490 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 22:48:37,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:48:37,491 WARN L261 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-20 22:48:37,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:48:38,031 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:38,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:48:38,826 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 2 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:38,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1040631530] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:48:38,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [429828765] [2021-11-20 22:48:38,827 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 22:48:38,827 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:38,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:48:38,841 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:48:38,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-20 22:48:38,890 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 22:48:38,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:48:38,893 WARN L261 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-20 22:48:38,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:48:39,654 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:39,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:48:44,855 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:44,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [429828765] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:48:44,856 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-20 22:48:44,856 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 29, 29] total 80 [2021-11-20 22:48:44,856 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166561511] [2021-11-20 22:48:44,856 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-20 22:48:44,857 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-20 22:48:44,857 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-20 22:48:44,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-20 22:48:44,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1164, Invalid=5156, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 22:48:44,865 INFO L87 Difference]: Start difference. First operand 262 states and 353 transitions. Second operand has 80 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) [2021-11-20 22:49:58,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:49:58,100 INFO L93 Difference]: Finished difference Result 469 states and 602 transitions. [2021-11-20 22:49:58,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 190 states. [2021-11-20 22:49:58,100 INFO L78 Accepts]: Start accepts. Automaton has has 80 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) Word has length 30 [2021-11-20 22:49:58,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:49:58,103 INFO L225 Difference]: With dead ends: 469 [2021-11-20 22:49:58,104 INFO L226 Difference]: Without dead ends: 410 [2021-11-20 22:49:58,112 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 253 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20021 ImplicationChecksByTransitivity, 77.3s TimeCoverageRelationStatistics Valid=10088, Invalid=54682, Unknown=0, NotChecked=0, Total=64770 [2021-11-20 22:49:58,113 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 606 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 1974 mSolverCounterSat, 704 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 606 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 2853 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 704 IncrementalHoareTripleChecker+Valid, 1974 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 175 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2021-11-20 22:49:58,114 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [606 Valid, 118 Invalid, 2853 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [704 Valid, 1974 Invalid, 0 Unknown, 175 Unchecked, 3.5s Time] [2021-11-20 22:49:58,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2021-11-20 22:49:58,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 262. [2021-11-20 22:49:58,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 261 states have (on average 1.3448275862068966) internal successors, (351), 261 states have internal predecessors, (351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:49:58,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 351 transitions. [2021-11-20 22:49:58,165 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 351 transitions. Word has length 30 [2021-11-20 22:49:58,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:49:58,165 INFO L470 AbstractCegarLoop]: Abstraction has 262 states and 351 transitions. [2021-11-20 22:49:58,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 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) [2021-11-20 22:49:58,166 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 351 transitions. [2021-11-20 22:49:58,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 22:49:58,168 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:49:58,168 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:49:58,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-20 22:49:58,404 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-20 22:49:58,582 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-20 22:49:58,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt [2021-11-20 22:49:58,781 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:49:58,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:49:58,782 INFO L85 PathProgramCache]: Analyzing trace with hash -1978693868, now seen corresponding path program 3 times [2021-11-20 22:49:58,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-20 22:49:58,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [699915746] [2021-11-20 22:49:58,782 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:49:58,782 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-20 22:49:58,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-20 22:49:58,783 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-20 22:49:58,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-20 22:49:58,812 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-20 22:49:58,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:49:58,813 WARN L261 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-20 22:49:58,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:01,272 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 9 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:01,273 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:50:06,591 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 9 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:06,592 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-20 22:50:06,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [699915746] [2021-11-20 22:50:06,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [699915746] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:50:06,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2066286094] [2021-11-20 22:50:06,592 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:50:06,592 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-20 22:50:06,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-20 22:50:06,593 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-20 22:50:06,596 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-11-20 22:50:06,662 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-20 22:50:06,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:50:06,663 WARN L261 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-20 22:50:06,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:07,742 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 9 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:07,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:50:09,074 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 9 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:09,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2066286094] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:50:09,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1544594930] [2021-11-20 22:50:09,075 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:50:09,075 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:09,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:09,076 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:09,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-20 22:50:09,127 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-20 22:50:09,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:50:09,128 WARN L261 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-20 22:50:09,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:12,274 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:12,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:50:16,261 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:16,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1544594930] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:50:16,261 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-20 22:50:16,261 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 29, 29] total 83 [2021-11-20 22:50:16,261 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747823055] [2021-11-20 22:50:16,262 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-20 22:50:16,262 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-20 22:50:16,263 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-20 22:50:16,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-20 22:50:16,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1407, Invalid=5399, Unknown=0, NotChecked=0, Total=6806 [2021-11-20 22:50:16,265 INFO L87 Difference]: Start difference. First operand 262 states and 351 transitions. Second operand has 83 states, 83 states have (on average 1.072289156626506) internal successors, (89), 83 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:54,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:54,592 INFO L93 Difference]: Finished difference Result 496 states and 649 transitions. [2021-11-20 22:50:54,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2021-11-20 22:50:54,592 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 1.072289156626506) internal successors, (89), 83 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-20 22:50:54,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:54,596 INFO L225 Difference]: With dead ends: 496 [2021-11-20 22:50:54,597 INFO L226 Difference]: Without dead ends: 444 [2021-11-20 22:50:54,600 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 92 SyntacticMatches, 2 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 9752 ImplicationChecksByTransitivity, 48.2s TimeCoverageRelationStatistics Valid=5931, Invalid=20801, Unknown=0, NotChecked=0, Total=26732 [2021-11-20 22:50:54,601 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 320 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 582 mSolverCounterSat, 275 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 320 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 1847 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 275 IncrementalHoareTripleChecker+Valid, 582 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 990 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:54,601 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [320 Valid, 59 Invalid, 1847 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [275 Valid, 582 Invalid, 0 Unknown, 990 Unchecked, 1.2s Time] [2021-11-20 22:50:54,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 444 states. [2021-11-20 22:50:54,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 444 to 296. [2021-11-20 22:50:54,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 296 states, 295 states have (on average 1.335593220338983) internal successors, (394), 295 states have internal predecessors, (394), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:54,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 394 transitions. [2021-11-20 22:50:54,652 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 394 transitions. Word has length 30 [2021-11-20 22:50:54,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:54,652 INFO L470 AbstractCegarLoop]: Abstraction has 296 states and 394 transitions. [2021-11-20 22:50:54,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 1.072289156626506) internal successors, (89), 83 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:54,653 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 394 transitions. [2021-11-20 22:50:54,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 22:50:54,655 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:54,656 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 2, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:54,666 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:54,877 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:55,090 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:55,266 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:55,267 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:55,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:55,267 INFO L85 PathProgramCache]: Analyzing trace with hash -2035952170, now seen corresponding path program 4 times [2021-11-20 22:50:55,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-20 22:50:55,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1858586106] [2021-11-20 22:50:55,268 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:50:55,268 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-20 22:50:55,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-20 22:50:55,270 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-20 22:50:55,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-20 22:50:55,306 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:50:55,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:50:55,307 WARN L261 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 22:50:55,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:56,706 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:56,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:51:00,835 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:00,836 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-20 22:51:00,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1858586106] [2021-11-20 22:51:00,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1858586106] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:51:00,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1704946788] [2021-11-20 22:51:00,836 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:51:00,836 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-20 22:51:00,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-20 22:51:00,837 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-20 22:51:00,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-20 22:51:00,912 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:51:00,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:51:00,916 WARN L261 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 22:51:00,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:51:01,743 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:01,744 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:51:02,662 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:02,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1704946788] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:51:02,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499613406] [2021-11-20 22:51:02,662 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:51:02,663 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:51:02,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:51:02,663 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:51:02,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-20 22:51:02,696 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:51:02,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:51:02,698 WARN L261 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-20 22:51:02,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:51:03,786 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:03,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:51:10,249 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:51:10,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1499613406] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:51:10,250 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-20 22:51:10,250 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 29, 29] total 80 [2021-11-20 22:51:10,250 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723894446] [2021-11-20 22:51:10,250 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-20 22:51:10,251 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-20 22:51:10,251 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-20 22:51:10,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-20 22:51:10,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1180, Invalid=5140, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 22:51:10,253 INFO L87 Difference]: Start difference. First operand 296 states and 394 transitions. Second operand has 80 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) [2021-11-20 22:52:12,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:52:12,204 INFO L93 Difference]: Finished difference Result 570 states and 729 transitions. [2021-11-20 22:52:12,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 154 states. [2021-11-20 22:52:12,204 INFO L78 Accepts]: Start accepts. Automaton has has 80 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) Word has length 30 [2021-11-20 22:52:12,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:52:12,208 INFO L225 Difference]: With dead ends: 570 [2021-11-20 22:52:12,208 INFO L226 Difference]: Without dead ends: 512 [2021-11-20 22:52:12,212 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 311 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13597 ImplicationChecksByTransitivity, 67.5s TimeCoverageRelationStatistics Valid=6695, Invalid=40177, Unknown=0, NotChecked=0, Total=46872 [2021-11-20 22:52:12,213 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 504 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 2111 mSolverCounterSat, 720 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 504 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 3035 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 720 IncrementalHoareTripleChecker+Valid, 2111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 204 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:52:12,213 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [504 Valid, 141 Invalid, 3035 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [720 Valid, 2111 Invalid, 0 Unknown, 204 Unchecked, 4.2s Time] [2021-11-20 22:52:12,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 512 states. [2021-11-20 22:52:12,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 512 to 332. [2021-11-20 22:52:12,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 332 states, 331 states have (on average 1.3353474320241692) internal successors, (442), 331 states have internal predecessors, (442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:52:12,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 442 transitions. [2021-11-20 22:52:12,271 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 442 transitions. Word has length 30 [2021-11-20 22:52:12,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:52:12,273 INFO L470 AbstractCegarLoop]: Abstraction has 332 states and 442 transitions. [2021-11-20 22:52:12,273 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 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) [2021-11-20 22:52:12,273 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 442 transitions. [2021-11-20 22:52:12,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 22:52:12,275 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:52:12,275 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 2, 1, 1, 1, 1, 1, 1] [2021-11-20 22:52:12,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2021-11-20 22:52:12,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-20 22:52:12,698 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-20 22:52:12,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:52:12,878 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:52:12,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:52:12,878 INFO L85 PathProgramCache]: Analyzing trace with hash 1636215058, now seen corresponding path program 5 times [2021-11-20 22:52:12,879 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-20 22:52:12,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [101369104] [2021-11-20 22:52:12,879 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-20 22:52:12,879 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-20 22:52:12,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-20 22:52:12,880 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-20 22:52:12,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-20 22:52:12,904 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2021-11-20 22:52:12,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:52:12,905 WARN L261 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-20 22:52:12,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:52:14,337 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:14,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:52:18,287 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 2 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:18,287 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-20 22:52:18,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [101369104] [2021-11-20 22:52:18,288 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [101369104] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:52:18,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [997265293] [2021-11-20 22:52:18,288 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-20 22:52:18,288 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-20 22:52:18,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-20 22:52:18,289 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-20 22:52:18,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-20 22:52:18,346 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2021-11-20 22:52:18,346 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:52:18,347 WARN L261 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-20 22:52:18,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:52:18,920 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:18,920 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:52:20,090 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 2 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:20,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [997265293] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:52:20,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1268426466] [2021-11-20 22:52:20,091 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-20 22:52:20,091 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:52:20,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:52:20,106 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:52:20,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-20 22:52:20,166 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2021-11-20 22:52:20,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:52:20,169 WARN L261 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-20 22:52:20,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:52:20,990 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:20,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:52:26,493 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:52:26,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1268426466] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:52:26,493 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-20 22:52:26,493 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 29, 29] total 80 [2021-11-20 22:52:26,493 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736858770] [2021-11-20 22:52:26,493 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-20 22:52:26,494 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-20 22:52:26,494 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-20 22:52:26,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-20 22:52:26,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1180, Invalid=5140, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 22:52:26,495 INFO L87 Difference]: Start difference. First operand 332 states and 442 transitions. Second operand has 80 states, 80 states have (on average 1.1125) internal successors, (89), 80 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:53:24,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:53:24,528 INFO L93 Difference]: Finished difference Result 575 states and 744 transitions. [2021-11-20 22:53:24,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2021-11-20 22:53:24,528 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 1.1125) internal successors, (89), 80 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-20 22:53:24,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:53:24,531 INFO L225 Difference]: With dead ends: 575 [2021-11-20 22:53:24,532 INFO L226 Difference]: Without dead ends: 502 [2021-11-20 22:53:24,535 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12898 ImplicationChecksByTransitivity, 63.6s TimeCoverageRelationStatistics Valid=7129, Invalid=38453, Unknown=0, NotChecked=0, Total=45582 [2021-11-20 22:53:24,536 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 512 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 1657 mSolverCounterSat, 745 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 512 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 2608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 745 IncrementalHoareTripleChecker+Valid, 1657 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 206 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:53:24,537 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [512 Valid, 86 Invalid, 2608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [745 Valid, 1657 Invalid, 0 Unknown, 206 Unchecked, 3.1s Time] [2021-11-20 22:53:24,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2021-11-20 22:53:24,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 328. [2021-11-20 22:53:24,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 327 states have (on average 1.3333333333333333) internal successors, (436), 327 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:53:24,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 436 transitions. [2021-11-20 22:53:24,579 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 436 transitions. Word has length 30 [2021-11-20 22:53:24,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:53:24,579 INFO L470 AbstractCegarLoop]: Abstraction has 328 states and 436 transitions. [2021-11-20 22:53:24,580 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 1.1125) internal successors, (89), 80 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:53:24,580 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 436 transitions. [2021-11-20 22:53:24,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 22:53:24,581 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:53:24,581 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 1, 1, 1, 1, 1, 1] [2021-11-20 22:53:24,591 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-20 22:53:24,790 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (25)] Ended with exit code 0 [2021-11-20 22:53:25,003 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-11-20 22:53:25,184 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:53:25,184 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:53:25,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:53:25,185 INFO L85 PathProgramCache]: Analyzing trace with hash 1578956756, now seen corresponding path program 6 times [2021-11-20 22:53:25,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-20 22:53:25,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1988227591] [2021-11-20 22:53:25,186 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-20 22:53:25,186 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-20 22:53:25,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-20 22:53:25,192 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-20 22:53:25,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-20 22:53:25,219 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-11-20 22:53:25,219 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:53:25,220 WARN L261 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-20 22:53:25,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:53:26,823 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:26,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:53:31,167 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:31,167 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-20 22:53:31,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1988227591] [2021-11-20 22:53:31,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1988227591] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:53:31,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1548092126] [2021-11-20 22:53:31,167 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-20 22:53:31,167 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-20 22:53:31,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-20 22:53:31,168 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-20 22:53:31,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-20 22:53:31,226 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-11-20 22:53:31,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:53:31,228 WARN L261 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-20 22:53:31,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:53:31,971 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:31,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:53:33,028 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:33,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1548092126] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:53:33,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1333484289] [2021-11-20 22:53:33,029 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-20 22:53:33,029 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:53:33,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:53:33,029 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:53:33,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-20 22:53:33,065 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-11-20 22:53:33,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:53:33,067 WARN L261 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-20 22:53:33,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:53:34,603 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:34,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:53:39,922 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:53:39,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1333484289] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:53:39,922 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-20 22:53:39,922 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 29, 29] total 83 [2021-11-20 22:53:39,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745578938] [2021-11-20 22:53:39,923 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-20 22:53:39,923 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-20 22:53:39,923 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-20 22:53:39,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-20 22:53:39,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1274, Invalid=5532, Unknown=0, NotChecked=0, Total=6806 [2021-11-20 22:53:39,924 INFO L87 Difference]: Start difference. First operand 328 states and 436 transitions. Second operand has 83 states, 83 states have (on average 1.072289156626506) internal successors, (89), 83 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:54:13,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:54:13,807 INFO L93 Difference]: Finished difference Result 507 states and 652 transitions. [2021-11-20 22:54:13,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2021-11-20 22:54:13,807 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 1.072289156626506) internal successors, (89), 83 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-20 22:54:13,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:54:13,810 INFO L225 Difference]: With dead ends: 507 [2021-11-20 22:54:13,810 INFO L226 Difference]: Without dead ends: 438 [2021-11-20 22:54:13,812 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 7645 ImplicationChecksByTransitivity, 42.3s TimeCoverageRelationStatistics Valid=4544, Invalid=20262, Unknown=0, NotChecked=0, Total=24806 [2021-11-20 22:54:13,813 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 263 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 942 mSolverCounterSat, 312 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 263 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 2310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 312 IncrementalHoareTripleChecker+Valid, 942 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1056 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-20 22:54:13,813 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [263 Valid, 123 Invalid, 2310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [312 Valid, 942 Invalid, 0 Unknown, 1056 Unchecked, 1.4s Time] [2021-11-20 22:54:13,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 438 states. [2021-11-20 22:54:13,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 438 to 308. [2021-11-20 22:54:13,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 308 states, 307 states have (on average 1.3355048859934853) internal successors, (410), 307 states have internal predecessors, (410), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:54:13,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 410 transitions. [2021-11-20 22:54:13,854 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 410 transitions. Word has length 30 [2021-11-20 22:54:13,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:54:13,854 INFO L470 AbstractCegarLoop]: Abstraction has 308 states and 410 transitions. [2021-11-20 22:54:13,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 1.072289156626506) internal successors, (89), 83 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:54:13,855 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 410 transitions. [2021-11-20 22:54:13,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 22:54:13,855 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:54:13,856 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 2, 1, 1, 1, 1, 1, 1] [2021-11-20 22:54:13,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-20 22:54:14,062 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (29)] Ended with exit code 0 [2021-11-20 22:54:14,267 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (28)] Ended with exit code 0 [2021-11-20 22:54:14,461 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-20 22:54:14,461 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:54:14,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:54:14,462 INFO L85 PathProgramCache]: Analyzing trace with hash -497923054, now seen corresponding path program 7 times [2021-11-20 22:54:14,462 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-20 22:54:14,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1309162770] [2021-11-20 22:54:14,462 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:54:14,462 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-20 22:54:14,462 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-20 22:54:14,463 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-20 22:54:14,464 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-20 22:54:14,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:54:14,484 WARN L261 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 22:54:14,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:54:15,692 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:54:15,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:54:19,107 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:54:19,107 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-20 22:54:19,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1309162770] [2021-11-20 22:54:19,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1309162770] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:54:19,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [55343531] [2021-11-20 22:54:19,108 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:54:19,108 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-20 22:54:19,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-20 22:54:19,108 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-20 22:54:19,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-20 22:54:19,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:54:19,161 WARN L261 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 22:54:19,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:54:19,683 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:54:19,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:54:20,339 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:54:20,339 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [55343531] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:54:20,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [360238635] [2021-11-20 22:54:20,339 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 22:54:20,340 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:54:20,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:54:20,340 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:54:20,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-20 22:54:20,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:54:20,373 WARN L261 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-20 22:54:20,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:54:21,233 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:54:21,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:54:26,544 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:54:26,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [360238635] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:54:26,544 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-20 22:54:26,544 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 29, 29] total 80 [2021-11-20 22:54:26,545 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968015983] [2021-11-20 22:54:26,545 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-20 22:54:26,545 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-20 22:54:26,546 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-20 22:54:26,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-20 22:54:26,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1181, Invalid=5139, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 22:54:26,547 INFO L87 Difference]: Start difference. First operand 308 states and 410 transitions. Second operand has 80 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) [2021-11-20 22:55:43,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:55:43,098 INFO L93 Difference]: Finished difference Result 758 states and 980 transitions. [2021-11-20 22:55:43,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 202 states. [2021-11-20 22:55:43,098 INFO L78 Accepts]: Start accepts. Automaton has has 80 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) Word has length 30 [2021-11-20 22:55:43,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:55:43,102 INFO L225 Difference]: With dead ends: 758 [2021-11-20 22:55:43,102 INFO L226 Difference]: Without dead ends: 707 [2021-11-20 22:55:43,108 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 263 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21518 ImplicationChecksByTransitivity, 80.1s TimeCoverageRelationStatistics Valid=10117, Invalid=59843, Unknown=0, NotChecked=0, Total=69960 [2021-11-20 22:55:43,109 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 550 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 2492 mSolverCounterSat, 827 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 550 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 3580 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 827 IncrementalHoareTripleChecker+Valid, 2492 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 261 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2021-11-20 22:55:43,109 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [550 Valid, 127 Invalid, 3580 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [827 Valid, 2492 Invalid, 0 Unknown, 261 Unchecked, 4.3s Time] [2021-11-20 22:55:43,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 707 states. [2021-11-20 22:55:43,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 707 to 452. [2021-11-20 22:55:43,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 451 states have (on average 1.3481152993348116) internal successors, (608), 451 states have internal predecessors, (608), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:55:43,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 608 transitions. [2021-11-20 22:55:43,197 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 608 transitions. Word has length 30 [2021-11-20 22:55:43,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:55:43,197 INFO L470 AbstractCegarLoop]: Abstraction has 452 states and 608 transitions. [2021-11-20 22:55:43,198 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 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) [2021-11-20 22:55:43,198 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 608 transitions. [2021-11-20 22:55:43,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 22:55:43,199 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:55:43,199 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 2, 1, 1, 1, 1, 1, 1] [2021-11-20 22:55:43,208 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-20 22:55:43,424 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-20 22:55:43,609 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-11-20 22:55:43,804 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt [2021-11-20 22:55:43,805 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:55:43,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:55:43,805 INFO L85 PathProgramCache]: Analyzing trace with hash -1120723122, now seen corresponding path program 8 times [2021-11-20 22:55:43,805 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-20 22:55:43,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [934229574] [2021-11-20 22:55:43,806 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 22:55:43,806 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-20 22:55:43,806 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-20 22:55:43,806 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-20 22:55:43,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-20 22:55:43,830 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 22:55:43,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:55:43,831 WARN L261 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 22:55:43,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:55:45,041 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:55:45,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:55:48,618 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 2 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:55:48,618 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-20 22:55:48,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [934229574] [2021-11-20 22:55:48,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [934229574] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:55:48,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1422532717] [2021-11-20 22:55:48,618 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 22:55:48,618 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-20 22:55:48,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-20 22:55:48,619 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-20 22:55:48,621 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-11-20 22:55:48,670 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 22:55:48,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:55:48,671 WARN L261 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 22:55:48,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:55:49,206 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:55:49,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:55:49,885 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 2 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:55:49,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1422532717] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:55:49,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [817864368] [2021-11-20 22:55:49,886 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 22:55:49,886 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:55:49,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:55:49,887 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:55:49,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-20 22:55:49,921 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 22:55:49,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:55:49,922 WARN L261 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-20 22:55:49,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:55:50,706 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:55:50,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:55:56,234 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:55:56,234 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [817864368] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:55:56,234 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-20 22:55:56,235 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 29, 29] total 80 [2021-11-20 22:55:56,235 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907507715] [2021-11-20 22:55:56,235 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-20 22:55:56,235 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-20 22:55:56,235 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-20 22:55:56,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-20 22:55:56,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1157, Invalid=5163, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 22:55:56,236 INFO L87 Difference]: Start difference. First operand 452 states and 608 transitions. Second operand has 80 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) [2021-11-20 22:57:06,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:57:06,244 INFO L93 Difference]: Finished difference Result 782 states and 1023 transitions. [2021-11-20 22:57:06,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 175 states. [2021-11-20 22:57:06,245 INFO L78 Accepts]: Start accepts. Automaton has has 80 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) Word has length 30 [2021-11-20 22:57:06,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:57:06,248 INFO L225 Difference]: With dead ends: 782 [2021-11-20 22:57:06,248 INFO L226 Difference]: Without dead ends: 701 [2021-11-20 22:57:06,251 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 237 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16804 ImplicationChecksByTransitivity, 74.9s TimeCoverageRelationStatistics Valid=8983, Invalid=47899, Unknown=0, NotChecked=0, Total=56882 [2021-11-20 22:57:06,251 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 409 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 2010 mSolverCounterSat, 675 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 409 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 2830 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 675 IncrementalHoareTripleChecker+Valid, 2010 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 145 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2021-11-20 22:57:06,252 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [409 Valid, 164 Invalid, 2830 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [675 Valid, 2010 Invalid, 0 Unknown, 145 Unchecked, 3.3s Time] [2021-11-20 22:57:06,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 701 states. [2021-11-20 22:57:06,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 701 to 485. [2021-11-20 22:57:06,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 1.3367768595041323) internal successors, (647), 484 states have internal predecessors, (647), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:57:06,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 647 transitions. [2021-11-20 22:57:06,352 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 647 transitions. Word has length 30 [2021-11-20 22:57:06,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:57:06,352 INFO L470 AbstractCegarLoop]: Abstraction has 485 states and 647 transitions. [2021-11-20 22:57:06,354 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 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) [2021-11-20 22:57:06,354 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 647 transitions. [2021-11-20 22:57:06,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 22:57:06,355 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:57:06,355 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 1, 1, 1, 1, 1, 1] [2021-11-20 22:57:06,361 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (35)] Forceful destruction successful, exit code 0 [2021-11-20 22:57:06,582 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-20 22:57:06,769 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-11-20 22:57:06,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-20 22:57:06,963 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:57:06,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:57:06,963 INFO L85 PathProgramCache]: Analyzing trace with hash -1378888560, now seen corresponding path program 9 times [2021-11-20 22:57:06,963 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-20 22:57:06,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1322484632] [2021-11-20 22:57:06,964 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:57:06,964 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-20 22:57:06,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-20 22:57:06,965 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-20 22:57:06,977 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-20 22:57:07,002 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-20 22:57:07,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:57:07,003 WARN L261 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-20 22:57:07,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:57:09,200 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 3 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:57:09,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:57:13,792 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 9 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:57:13,792 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-20 22:57:13,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1322484632] [2021-11-20 22:57:13,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1322484632] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:57:13,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [469791712] [2021-11-20 22:57:13,793 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:57:13,793 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-20 22:57:13,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-20 22:57:13,794 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-20 22:57:13,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-20 22:57:13,851 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-20 22:57:13,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:57:13,853 WARN L261 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-20 22:57:13,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:57:14,713 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 3 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:57:14,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:57:15,850 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 9 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:57:15,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [469791712] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:57:15,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2042018213] [2021-11-20 22:57:15,851 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 22:57:15,851 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:57:15,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:57:15,851 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:57:15,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-20 22:57:15,888 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-20 22:57:15,888 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:57:15,889 WARN L261 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-20 22:57:15,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:57:18,482 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:57:18,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:57:21,946 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:57:21,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2042018213] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:57:21,946 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-20 22:57:21,947 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 29, 29] total 83 [2021-11-20 22:57:21,947 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467587337] [2021-11-20 22:57:21,947 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-20 22:57:21,947 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-20 22:57:21,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-20 22:57:21,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-20 22:57:21,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1380, Invalid=5426, Unknown=0, NotChecked=0, Total=6806 [2021-11-20 22:57:21,948 INFO L87 Difference]: Start difference. First operand 485 states and 647 transitions. Second operand has 83 states, 83 states have (on average 1.072289156626506) internal successors, (89), 83 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:58:12,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:58:12,162 INFO L93 Difference]: Finished difference Result 932 states and 1222 transitions. [2021-11-20 22:58:12,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 145 states. [2021-11-20 22:58:12,163 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 1.072289156626506) internal successors, (89), 83 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-20 22:58:12,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:58:12,168 INFO L225 Difference]: With dead ends: 932 [2021-11-20 22:58:12,168 INFO L226 Difference]: Without dead ends: 889 [2021-11-20 22:58:12,171 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 13319 ImplicationChecksByTransitivity, 58.7s TimeCoverageRelationStatistics Valid=7617, Invalid=30995, Unknown=0, NotChecked=0, Total=38612 [2021-11-20 22:58:12,172 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 320 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 666 mSolverCounterSat, 317 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 320 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 2665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 317 IncrementalHoareTripleChecker+Valid, 666 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1682 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:58:12,173 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [320 Valid, 58 Invalid, 2665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [317 Valid, 666 Invalid, 0 Unknown, 1682 Unchecked, 1.1s Time] [2021-11-20 22:58:12,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 889 states. [2021-11-20 22:58:12,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 889 to 657. [2021-11-20 22:58:12,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 657 states, 656 states have (on average 1.3399390243902438) internal successors, (879), 656 states have internal predecessors, (879), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:58:12,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 657 states to 657 states and 879 transitions. [2021-11-20 22:58:12,296 INFO L78 Accepts]: Start accepts. Automaton has 657 states and 879 transitions. Word has length 30 [2021-11-20 22:58:12,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:58:12,297 INFO L470 AbstractCegarLoop]: Abstraction has 657 states and 879 transitions. [2021-11-20 22:58:12,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 1.072289156626506) internal successors, (89), 83 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:58:12,297 INFO L276 IsEmpty]: Start isEmpty. Operand 657 states and 879 transitions. [2021-11-20 22:58:12,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 22:58:12,298 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:58:12,298 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 1, 1, 1, 1, 1, 1] [2021-11-20 22:58:12,322 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (37)] Ended with exit code 0 [2021-11-20 22:58:12,510 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (38)] Forceful destruction successful, exit code 0 [2021-11-20 22:58:12,728 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-20 22:58:12,909 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:58:12,909 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:58:12,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:58:12,909 INFO L85 PathProgramCache]: Analyzing trace with hash -1436146862, now seen corresponding path program 10 times [2021-11-20 22:58:12,910 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-20 22:58:12,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [762336160] [2021-11-20 22:58:12,910 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:58:12,910 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-20 22:58:12,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-20 22:58:12,911 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-20 22:58:12,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-20 22:58:12,948 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:58:12,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:58:12,950 WARN L261 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-20 22:58:12,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:58:14,165 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:58:14,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:58:17,992 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:58:17,992 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-20 22:58:17,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [762336160] [2021-11-20 22:58:17,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [762336160] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:58:17,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [540240236] [2021-11-20 22:58:17,993 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:58:17,993 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-20 22:58:17,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-20 22:58:17,993 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-20 22:58:18,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-20 22:58:18,050 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:58:18,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:58:18,051 WARN L261 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-20 22:58:18,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:58:18,556 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:58:18,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:58:19,207 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:58:19,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [540240236] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:58:19,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018790176] [2021-11-20 22:58:19,207 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 22:58:19,207 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:58:19,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:58:19,208 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:58:19,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-20 22:58:19,236 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 22:58:19,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:58:19,237 WARN L261 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-20 22:58:19,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:58:20,019 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:58:20,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:58:25,621 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:58:25,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018790176] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:58:25,622 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-20 22:58:25,622 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 29, 29] total 80 [2021-11-20 22:58:25,622 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81218743] [2021-11-20 22:58:25,622 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-20 22:58:25,622 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-20 22:58:25,622 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-20 22:58:25,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-20 22:58:25,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1157, Invalid=5163, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 22:58:25,623 INFO L87 Difference]: Start difference. First operand 657 states and 879 transitions. Second operand has 80 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) [2021-11-20 22:59:24,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:59:24,333 INFO L93 Difference]: Finished difference Result 963 states and 1256 transitions. [2021-11-20 22:59:24,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2021-11-20 22:59:24,333 INFO L78 Accepts]: Start accepts. Automaton has has 80 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) Word has length 30 [2021-11-20 22:59:24,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:59:24,337 INFO L225 Difference]: With dead ends: 963 [2021-11-20 22:59:24,337 INFO L226 Difference]: Without dead ends: 902 [2021-11-20 22:59:24,341 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11557 ImplicationChecksByTransitivity, 63.6s TimeCoverageRelationStatistics Valid=6474, Invalid=35756, Unknown=0, NotChecked=0, Total=42230 [2021-11-20 22:59:24,342 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 448 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 2193 mSolverCounterSat, 708 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 448 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 3103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 708 IncrementalHoareTripleChecker+Valid, 2193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 202 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2021-11-20 22:59:24,342 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [448 Valid, 132 Invalid, 3103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [708 Valid, 2193 Invalid, 0 Unknown, 202 Unchecked, 3.7s Time] [2021-11-20 22:59:24,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 902 states. [2021-11-20 22:59:24,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 902 to 696. [2021-11-20 22:59:24,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 696 states, 695 states have (on average 1.3410071942446042) internal successors, (932), 695 states have internal predecessors, (932), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:59:24,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 696 states to 696 states and 932 transitions. [2021-11-20 22:59:24,497 INFO L78 Accepts]: Start accepts. Automaton has 696 states and 932 transitions. Word has length 30 [2021-11-20 22:59:24,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:59:24,497 INFO L470 AbstractCegarLoop]: Abstraction has 696 states and 932 transitions. [2021-11-20 22:59:24,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 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) [2021-11-20 22:59:24,498 INFO L276 IsEmpty]: Start isEmpty. Operand 696 states and 932 transitions. [2021-11-20 22:59:24,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 22:59:24,499 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:59:24,499 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 2, 1, 1, 1, 1, 1, 1] [2021-11-20 22:59:24,531 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-20 22:59:24,726 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (41)] Forceful destruction successful, exit code 0 [2021-11-20 22:59:24,931 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (40)] Ended with exit code 0 [2021-11-20 22:59:25,122 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 [2021-11-20 22:59:25,123 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:59:25,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:59:25,123 INFO L85 PathProgramCache]: Analyzing trace with hash 216357974, now seen corresponding path program 11 times [2021-11-20 22:59:25,123 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-20 22:59:25,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [822287668] [2021-11-20 22:59:25,123 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-20 22:59:25,123 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-20 22:59:25,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat [2021-11-20 22:59:25,124 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-20 22:59:25,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-20 22:59:25,167 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2021-11-20 22:59:25,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:59:25,169 WARN L261 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-20 22:59:25,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:59:26,325 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:59:26,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:59:29,606 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:59:29,606 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-20 22:59:29,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [822287668] [2021-11-20 22:59:29,606 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [822287668] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:59:29,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [470984804] [2021-11-20 22:59:29,606 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-20 22:59:29,607 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-20 22:59:29,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 [2021-11-20 22:59:29,609 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-20 22:59:29,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-20 22:59:29,661 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2021-11-20 22:59:29,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:59:29,662 WARN L261 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-20 22:59:29,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:59:30,192 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:59:30,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:59:31,149 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:59:31,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [470984804] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:59:31,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [31892904] [2021-11-20 22:59:31,149 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-20 22:59:31,149 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:59:31,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:59:31,150 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:59:31,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62a7dfad-e26a-4c18-9e81-388a15d4a1da/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-20 22:59:31,180 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2021-11-20 22:59:31,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 22:59:31,182 WARN L261 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-20 22:59:31,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:59:31,934 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:59:31,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:59:36,621 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:59:36,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [31892904] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:59:36,621 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-20 22:59:36,622 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 29, 29] total 80 [2021-11-20 22:59:36,622 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595641186] [2021-11-20 22:59:36,622 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-20 22:59:36,622 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-20 22:59:36,623 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-20 22:59:36,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-20 22:59:36,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1182, Invalid=5138, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 22:59:36,624 INFO L87 Difference]: Start difference. First operand 696 states and 932 transitions. Second operand has 80 states, 80 states have (on average 1.1125) internal successors, (89), 80 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)