./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6a47aea7 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl --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 927c21c2096a228a934a41e2a18844ff0d670b1b365a7d276a4e36116ab9babc --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:17:49,738 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:17:49,742 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:17:49,809 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:17:49,810 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:17:49,819 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:17:49,822 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:17:49,829 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:17:49,832 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:17:49,836 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:17:49,838 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:17:49,839 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:17:49,840 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:17:49,842 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:17:49,844 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:17:49,846 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:17:49,852 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:17:49,853 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:17:49,856 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:17:49,860 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:17:49,868 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:17:49,871 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:17:49,873 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:17:49,876 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:17:49,885 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:17:49,885 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:17:49,886 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:17:49,888 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:17:49,888 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:17:49,890 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:17:49,891 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:17:49,892 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:17:49,894 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:17:49,895 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:17:49,896 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:17:49,897 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:17:49,898 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:17:49,898 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:17:49,899 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:17:49,900 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:17:49,901 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:17:49,902 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:17:49,931 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:17:49,932 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:17:49,933 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:17:49,933 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:17:49,934 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:17:49,934 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:17:49,934 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:17:49,935 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:17:49,935 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:17:49,935 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:17:49,935 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:17:49,936 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:17:49,936 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:17:49,936 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:17:49,937 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:17:49,937 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:17:49,937 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:17:49,938 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:17:49,938 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:17:49,939 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:17:49,939 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:17:49,939 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:17:49,940 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:17:49,940 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:17:49,940 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:17:49,940 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:17:49,941 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:17:49,941 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:17:49,941 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:17:49,942 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:17:49,942 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:17:49,942 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:17:49,943 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:17:49,943 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:17:49,943 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:17:49,943 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:17:49,944 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:17:49,944 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:17:49,944 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:17:49,945 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:17:49,945 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:17:49,945 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_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 927c21c2096a228a934a41e2a18844ff0d670b1b365a7d276a4e36116ab9babc [2021-11-23 17:17:50,296 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:17:50,323 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:17:50,326 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:17:50,328 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:17:50,329 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:17:50,331 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c [2021-11-23 17:17:50,414 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/data/0edbd382e/862e5f60998e46f18962d69165f454bc/FLAG5d015af9e [2021-11-23 17:17:51,032 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:17:51,033 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c [2021-11-23 17:17:51,051 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/data/0edbd382e/862e5f60998e46f18962d69165f454bc/FLAG5d015af9e [2021-11-23 17:17:51,349 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/data/0edbd382e/862e5f60998e46f18962d69165f454bc [2021-11-23 17:17:51,354 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:17:51,356 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:17:51,375 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:17:51,375 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:17:51,379 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:17:51,381 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:17:51" (1/1) ... [2021-11-23 17:17:51,382 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@13ab474f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:51, skipping insertion in model container [2021-11-23 17:17:51,382 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:17:51" (1/1) ... [2021-11-23 17:17:51,391 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:17:51,430 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:17:51,822 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_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c[9376,9389] [2021-11-23 17:17:51,825 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:17:51,841 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:17:51,905 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_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c[9376,9389] [2021-11-23 17:17:51,906 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:17:51,924 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:17:51,925 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:51 WrapperNode [2021-11-23 17:17:51,925 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:17:51,926 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:17:51,927 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:17:51,927 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:17:51,936 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:51" (1/1) ... [2021-11-23 17:17:51,948 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:51" (1/1) ... [2021-11-23 17:17:51,983 INFO L137 Inliner]: procedures = 24, calls = 15, calls flagged for inlining = 10, calls inlined = 10, statements flattened = 313 [2021-11-23 17:17:51,984 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:17:51,985 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:17:51,985 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:17:51,985 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:17:51,996 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:51" (1/1) ... [2021-11-23 17:17:51,996 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:51" (1/1) ... [2021-11-23 17:17:52,001 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:51" (1/1) ... [2021-11-23 17:17:52,001 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:51" (1/1) ... [2021-11-23 17:17:52,011 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:51" (1/1) ... [2021-11-23 17:17:52,019 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:51" (1/1) ... [2021-11-23 17:17:52,022 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:51" (1/1) ... [2021-11-23 17:17:52,043 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:17:52,044 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:17:52,044 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:17:52,045 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:17:52,046 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:51" (1/1) ... [2021-11-23 17:17:52,063 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:17:52,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:17:52,101 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:17:52,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:17:52,157 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:17:52,158 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:17:52,159 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:17:52,159 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:17:52,271 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:17:52,273 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:17:52,947 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:17:53,020 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 17:17:53,026 INFO L158 Benchmark]: Toolchain (without parser) took 1668.84ms. Allocated memory is still 94.4MB. Free memory was 53.3MB in the beginning and 37.9MB in the end (delta: 15.4MB). Peak memory consumption was 14.6MB. Max. memory is 16.1GB. [2021-11-23 17:17:53,027 INFO L158 Benchmark]: CDTParser took 0.23ms. Allocated memory is still 94.4MB. Free memory was 69.9MB in the beginning and 69.9MB in the end (delta: 84.0kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:17:53,028 INFO L158 Benchmark]: CACSL2BoogieTranslator took 550.46ms. Allocated memory is still 94.4MB. Free memory was 52.8MB in the beginning and 65.5MB in the end (delta: -12.7MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-11-23 17:17:53,029 INFO L158 Benchmark]: Boogie Procedure Inliner took 57.89ms. Allocated memory is still 94.4MB. Free memory was 65.5MB in the beginning and 63.1MB in the end (delta: 2.5MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-11-23 17:17:53,030 INFO L158 Benchmark]: Boogie Preprocessor took 58.42ms. Allocated memory is still 94.4MB. Free memory was 63.1MB in the beginning and 61.3MB in the end (delta: 1.8MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:17:53,031 INFO L158 Benchmark]: RCFGBuilder took 979.63ms. Allocated memory is still 94.4MB. Free memory was 61.0MB in the beginning and 37.9MB in the end (delta: 23.1MB). Peak memory consumption was 23.1MB. Max. memory is 16.1GB. [2021-11-23 17:17:53,035 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 94.4MB. Free memory was 69.9MB in the beginning and 69.9MB in the end (delta: 84.0kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 550.46ms. Allocated memory is still 94.4MB. Free memory was 52.8MB in the beginning and 65.5MB in the end (delta: -12.7MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 57.89ms. Allocated memory is still 94.4MB. Free memory was 65.5MB in the beginning and 63.1MB in the end (delta: 2.5MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Boogie Preprocessor took 58.42ms. Allocated memory is still 94.4MB. Free memory was 63.1MB in the beginning and 61.3MB in the end (delta: 1.8MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 979.63ms. Allocated memory is still 94.4MB. Free memory was 61.0MB in the beginning and 37.9MB in the end (delta: 23.1MB). Peak memory consumption was 23.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 17:17:53,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/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_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl --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 927c21c2096a228a934a41e2a18844ff0d670b1b365a7d276a4e36116ab9babc --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:17:56,038 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:17:56,042 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:17:56,111 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:17:56,112 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:17:56,118 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:17:56,120 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:17:56,126 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:17:56,130 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:17:56,140 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:17:56,142 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:17:56,145 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:17:56,145 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:17:56,148 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:17:56,151 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:17:56,157 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:17:56,159 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:17:56,160 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:17:56,163 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:17:56,173 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:17:56,176 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:17:56,177 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:17:56,181 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:17:56,183 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:17:56,195 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:17:56,195 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:17:56,196 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:17:56,198 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:17:56,199 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:17:56,200 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:17:56,201 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:17:56,202 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:17:56,205 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:17:56,206 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:17:56,208 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:17:56,208 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:17:56,209 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:17:56,210 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:17:56,210 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:17:56,212 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:17:56,213 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:17:56,214 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:17:56,269 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:17:56,270 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:17:56,271 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:17:56,271 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:17:56,272 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:17:56,272 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:17:56,273 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:17:56,273 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:17:56,273 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:17:56,273 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:17:56,275 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:17:56,275 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:17:56,277 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:17:56,277 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:17:56,277 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:17:56,278 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:17:56,278 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:17:56,278 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:17:56,278 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:17:56,279 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:17:56,279 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:17:56,279 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:17:56,279 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:17:56,279 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:17:56,280 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:17:56,280 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:17:56,280 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:17:56,280 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:17:56,281 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:17:56,281 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:17:56,281 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:17:56,282 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:17:56,282 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:17:56,283 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:17:56,283 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:56,283 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:17:56,283 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:17:56,284 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:17:56,284 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_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 927c21c2096a228a934a41e2a18844ff0d670b1b365a7d276a4e36116ab9babc [2021-11-23 17:17:56,789 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:17:56,823 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:17:56,827 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:17:56,829 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:17:56,830 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:17:56,831 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c [2021-11-23 17:17:56,920 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/data/856b755dd/f4fca27a185d42f7b0954f141f70bb4e/FLAGe1c1e143a [2021-11-23 17:17:57,737 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:17:57,740 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c [2021-11-23 17:17:57,756 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/data/856b755dd/f4fca27a185d42f7b0954f141f70bb4e/FLAGe1c1e143a [2021-11-23 17:17:58,012 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/data/856b755dd/f4fca27a185d42f7b0954f141f70bb4e [2021-11-23 17:17:58,017 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:17:58,018 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:17:58,020 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:17:58,020 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:17:58,038 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:17:58,039 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:17:58" (1/1) ... [2021-11-23 17:17:58,041 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e7de5a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:58, skipping insertion in model container [2021-11-23 17:17:58,041 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:17:58" (1/1) ... [2021-11-23 17:17:58,049 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:17:58,115 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:17:58,384 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_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c[9376,9389] [2021-11-23 17:17:58,388 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:17:58,412 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:17:58,472 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_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c[9376,9389] [2021-11-23 17:17:58,473 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:17:58,492 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:17:58,493 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:58 WrapperNode [2021-11-23 17:17:58,493 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:17:58,494 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:17:58,495 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:17:58,495 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:17:58,504 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:58" (1/1) ... [2021-11-23 17:17:58,531 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:58" (1/1) ... [2021-11-23 17:17:58,592 INFO L137 Inliner]: procedures = 24, calls = 15, calls flagged for inlining = 10, calls inlined = 10, statements flattened = 299 [2021-11-23 17:17:58,593 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:17:58,594 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:17:58,594 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:17:58,595 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:17:58,606 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:58" (1/1) ... [2021-11-23 17:17:58,607 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:58" (1/1) ... [2021-11-23 17:17:58,620 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:58" (1/1) ... [2021-11-23 17:17:58,620 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:58" (1/1) ... [2021-11-23 17:17:58,642 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:58" (1/1) ... [2021-11-23 17:17:58,659 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:58" (1/1) ... [2021-11-23 17:17:58,663 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:58" (1/1) ... [2021-11-23 17:17:58,684 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:17:58,685 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:17:58,686 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:17:58,698 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:17:58,699 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:58" (1/1) ... [2021-11-23 17:17:58,708 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:17:58,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:17:58,753 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:17:58,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:17:58,816 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:17:58,816 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:17:58,818 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:17:58,819 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:17:59,011 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:17:59,013 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:17:59,720 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:17:59,737 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:17:59,737 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 17:17:59,740 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:17:59 BoogieIcfgContainer [2021-11-23 17:17:59,741 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:17:59,743 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:17:59,743 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:17:59,747 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:17:59,748 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:17:58" (1/3) ... [2021-11-23 17:17:59,749 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3dcb1004 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:17:59, skipping insertion in model container [2021-11-23 17:17:59,749 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:17:58" (2/3) ... [2021-11-23 17:17:59,750 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3dcb1004 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:17:59, skipping insertion in model container [2021-11-23 17:17:59,750 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:17:59" (3/3) ... [2021-11-23 17:17:59,752 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr-var-start-time.4.2.ufo.UNBOUNDED.pals.c [2021-11-23 17:17:59,759 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:17:59,759 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 17:17:59,849 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:17:59,860 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 [2021-11-23 17:17:59,861 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 17:17:59,902 INFO L276 IsEmpty]: Start isEmpty. Operand has 99 states, 97 states have (on average 1.690721649484536) internal successors, (164), 98 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:59,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 17:17:59,916 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:59,917 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:17:59,917 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:59,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:59,925 INFO L85 PathProgramCache]: Analyzing trace with hash -107778019, now seen corresponding path program 1 times [2021-11-23 17:17:59,944 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:59,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1476477285] [2021-11-23 17:17:59,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:59,947 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:59,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:59,955 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:59,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:18:00,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:00,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 17:18:00,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:00,264 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:00,265 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:00,266 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:00,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1476477285] [2021-11-23 17:18:00,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1476477285] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:00,267 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:00,268 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:18:00,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204802840] [2021-11-23 17:18:00,271 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:00,277 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 17:18:00,277 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:00,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 17:18:00,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:18:00,324 INFO L87 Difference]: Start difference. First operand has 99 states, 97 states have (on average 1.690721649484536) internal successors, (164), 98 states have internal predecessors, (164), 0 states have call successors, (0), 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 14.5) internal successors, (29), 2 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:00,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:00,383 INFO L93 Difference]: Finished difference Result 165 states and 271 transitions. [2021-11-23 17:18:00,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 17:18:00,385 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 14.5) internal successors, (29), 2 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-23 17:18:00,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:00,397 INFO L225 Difference]: With dead ends: 165 [2021-11-23 17:18:00,398 INFO L226 Difference]: Without dead ends: 95 [2021-11-23 17:18:00,402 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:18:00,407 INFO L933 BasicCegarLoop]: 157 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, 157 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 [2021-11-23 17:18:00,408 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:18:00,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-23 17:18:00,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-11-23 17:18:00,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.6702127659574468) internal successors, (157), 94 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:00,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 157 transitions. [2021-11-23 17:18:00,460 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 157 transitions. Word has length 29 [2021-11-23 17:18:00,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:00,460 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 157 transitions. [2021-11-23 17:18:00,461 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 14.5) internal successors, (29), 2 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:00,461 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 157 transitions. [2021-11-23 17:18:00,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 17:18:00,463 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:00,464 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:00,483 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:00,678 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:00,678 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:00,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:00,679 INFO L85 PathProgramCache]: Analyzing trace with hash -241791525, now seen corresponding path program 1 times [2021-11-23 17:18:00,680 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:00,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [779419337] [2021-11-23 17:18:00,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:00,681 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:00,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:00,682 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:00,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:18:00,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:00,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:18:00,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:00,934 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:00,935 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:00,935 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:00,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [779419337] [2021-11-23 17:18:00,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [779419337] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:00,936 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:00,936 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:18:00,937 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52107891] [2021-11-23 17:18:00,937 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:00,939 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:18:00,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:00,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:18:00,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:18:00,945 INFO L87 Difference]: Start difference. First operand 95 states and 157 transitions. Second operand has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:01,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:01,079 INFO L93 Difference]: Finished difference Result 164 states and 264 transitions. [2021-11-23 17:18:01,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:18:01,081 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-23 17:18:01,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:01,087 INFO L225 Difference]: With dead ends: 164 [2021-11-23 17:18:01,089 INFO L226 Difference]: Without dead ends: 95 [2021-11-23 17:18:01,095 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:18:01,097 INFO L933 BasicCegarLoop]: 155 mSDtfsCounter, 3 mSDsluCounter, 438 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 593 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:01,098 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 593 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:18:01,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-23 17:18:01,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-11-23 17:18:01,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.4148936170212767) internal successors, (133), 94 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:01,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 133 transitions. [2021-11-23 17:18:01,111 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 133 transitions. Word has length 29 [2021-11-23 17:18:01,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:01,112 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 133 transitions. [2021-11-23 17:18:01,112 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:01,112 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 133 transitions. [2021-11-23 17:18:01,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 17:18:01,115 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:01,115 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:01,130 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:01,326 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:01,327 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:01,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:01,328 INFO L85 PathProgramCache]: Analyzing trace with hash 747245012, now seen corresponding path program 1 times [2021-11-23 17:18:01,328 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:01,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [906634268] [2021-11-23 17:18:01,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:01,329 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:01,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:01,335 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:01,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:18:01,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:01,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:18:01,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:01,599 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:01,600 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:01,600 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:01,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [906634268] [2021-11-23 17:18:01,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [906634268] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:01,601 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:01,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:18:01,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810596679] [2021-11-23 17:18:01,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:01,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:18:01,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:01,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:18:01,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:18:01,604 INFO L87 Difference]: Start difference. First operand 95 states and 133 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:01,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:01,657 INFO L93 Difference]: Finished difference Result 213 states and 319 transitions. [2021-11-23 17:18:01,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:18:01,671 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 0 states have call successors, (0), 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 52 [2021-11-23 17:18:01,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:01,673 INFO L225 Difference]: With dead ends: 213 [2021-11-23 17:18:01,674 INFO L226 Difference]: Without dead ends: 148 [2021-11-23 17:18:01,675 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:18:01,676 INFO L933 BasicCegarLoop]: 191 mSDtfsCounter, 87 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:01,677 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 289 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:18:01,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-23 17:18:01,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 146. [2021-11-23 17:18:01,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.4758620689655173) internal successors, (214), 145 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:01,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 214 transitions. [2021-11-23 17:18:01,693 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 214 transitions. Word has length 52 [2021-11-23 17:18:01,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:01,693 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 214 transitions. [2021-11-23 17:18:01,694 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:01,694 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 214 transitions. [2021-11-23 17:18:01,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 17:18:01,696 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:01,696 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:01,718 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:01,918 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:01,919 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:01,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:01,920 INFO L85 PathProgramCache]: Analyzing trace with hash 396878357, now seen corresponding path program 1 times [2021-11-23 17:18:01,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:01,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1169266533] [2021-11-23 17:18:01,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:01,922 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:01,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:01,932 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:01,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:18:02,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:02,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:18:02,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:02,214 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:02,215 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:02,215 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:02,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1169266533] [2021-11-23 17:18:02,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1169266533] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:02,216 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:02,216 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:18:02,216 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274764743] [2021-11-23 17:18:02,217 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:02,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:18:02,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:02,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:18:02,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:18:02,218 INFO L87 Difference]: Start difference. First operand 146 states and 214 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:02,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:02,249 INFO L93 Difference]: Finished difference Result 354 states and 542 transitions. [2021-11-23 17:18:02,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:18:02,250 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-23 17:18:02,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:02,253 INFO L225 Difference]: With dead ends: 354 [2021-11-23 17:18:02,253 INFO L226 Difference]: Without dead ends: 238 [2021-11-23 17:18:02,254 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:18:02,256 INFO L933 BasicCegarLoop]: 178 mSDtfsCounter, 82 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 280 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:02,257 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 280 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:18:02,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2021-11-23 17:18:02,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 236. [2021-11-23 17:18:02,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 236 states, 235 states have (on average 1.5106382978723405) internal successors, (355), 235 states have internal predecessors, (355), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:02,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 355 transitions. [2021-11-23 17:18:02,304 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 355 transitions. Word has length 53 [2021-11-23 17:18:02,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:02,305 INFO L470 AbstractCegarLoop]: Abstraction has 236 states and 355 transitions. [2021-11-23 17:18:02,306 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:02,306 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 355 transitions. [2021-11-23 17:18:02,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 17:18:02,314 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:02,314 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:02,332 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:02,523 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:02,523 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:02,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:02,524 INFO L85 PathProgramCache]: Analyzing trace with hash -778312060, now seen corresponding path program 1 times [2021-11-23 17:18:02,524 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:02,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [701841092] [2021-11-23 17:18:02,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:02,525 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:02,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:02,533 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:02,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:18:02,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:02,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:18:02,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:02,774 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:02,774 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:02,775 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:02,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [701841092] [2021-11-23 17:18:02,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [701841092] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:02,782 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:02,782 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:18:02,783 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819574929] [2021-11-23 17:18:02,783 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:02,783 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:18:02,784 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:02,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:18:02,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:18:02,786 INFO L87 Difference]: Start difference. First operand 236 states and 355 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:02,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:02,821 INFO L93 Difference]: Finished difference Result 600 states and 925 transitions. [2021-11-23 17:18:02,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:18:02,822 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-23 17:18:02,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:02,828 INFO L225 Difference]: With dead ends: 600 [2021-11-23 17:18:02,828 INFO L226 Difference]: Without dead ends: 394 [2021-11-23 17:18:02,834 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:18:02,838 INFO L933 BasicCegarLoop]: 165 mSDtfsCounter, 77 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:02,839 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 271 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:18:02,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2021-11-23 17:18:02,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 392. [2021-11-23 17:18:02,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 392 states, 391 states have (on average 1.5217391304347827) internal successors, (595), 391 states have internal predecessors, (595), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:02,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 595 transitions. [2021-11-23 17:18:02,892 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 595 transitions. Word has length 54 [2021-11-23 17:18:02,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:02,893 INFO L470 AbstractCegarLoop]: Abstraction has 392 states and 595 transitions. [2021-11-23 17:18:02,894 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:02,894 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 595 transitions. [2021-11-23 17:18:02,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 17:18:02,897 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:02,902 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:02,917 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:03,103 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:03,104 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:03,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:03,104 INFO L85 PathProgramCache]: Analyzing trace with hash 1214154885, now seen corresponding path program 1 times [2021-11-23 17:18:03,105 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:03,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1543143748] [2021-11-23 17:18:03,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:03,106 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:03,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:03,107 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:03,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:18:03,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:03,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:18:03,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:03,567 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:03,568 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:03,568 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:03,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1543143748] [2021-11-23 17:18:03,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1543143748] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:03,569 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:03,569 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:18:03,569 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504114336] [2021-11-23 17:18:03,569 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:03,570 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:18:03,570 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:03,571 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:18:03,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:18:03,571 INFO L87 Difference]: Start difference. First operand 392 states and 595 transitions. Second operand has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:03,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:03,758 INFO L93 Difference]: Finished difference Result 1708 states and 2627 transitions. [2021-11-23 17:18:03,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:18:03,759 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-23 17:18:03,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:03,770 INFO L225 Difference]: With dead ends: 1708 [2021-11-23 17:18:03,770 INFO L226 Difference]: Without dead ends: 1346 [2021-11-23 17:18:03,771 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:18:03,772 INFO L933 BasicCegarLoop]: 227 mSDtfsCounter, 345 mSDsluCounter, 297 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 345 SdHoareTripleChecker+Valid, 524 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:03,773 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [345 Valid, 524 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:18:03,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1346 states. [2021-11-23 17:18:03,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1346 to 1340. [2021-11-23 17:18:03,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1340 states, 1339 states have (on average 1.5317401045556385) internal successors, (2051), 1339 states have internal predecessors, (2051), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:03,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1340 states to 1340 states and 2051 transitions. [2021-11-23 17:18:03,847 INFO L78 Accepts]: Start accepts. Automaton has 1340 states and 2051 transitions. Word has length 55 [2021-11-23 17:18:03,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:03,848 INFO L470 AbstractCegarLoop]: Abstraction has 1340 states and 2051 transitions. [2021-11-23 17:18:03,856 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:03,857 INFO L276 IsEmpty]: Start isEmpty. Operand 1340 states and 2051 transitions. [2021-11-23 17:18:03,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-23 17:18:03,858 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:03,858 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:03,879 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:04,071 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:04,072 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:04,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:04,072 INFO L85 PathProgramCache]: Analyzing trace with hash -344994295, now seen corresponding path program 1 times [2021-11-23 17:18:04,072 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:04,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [576390825] [2021-11-23 17:18:04,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:04,075 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:04,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:04,076 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:04,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:18:04,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:04,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:18:04,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:05,033 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:05,034 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:05,034 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:05,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [576390825] [2021-11-23 17:18:05,035 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [576390825] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:05,035 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:05,035 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:18:05,035 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930316294] [2021-11-23 17:18:05,035 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:05,036 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:18:05,036 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:05,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:18:05,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:18:05,037 INFO L87 Difference]: Start difference. First operand 1340 states and 2051 transitions. Second operand has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:05,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:05,378 INFO L93 Difference]: Finished difference Result 5990 states and 9224 transitions. [2021-11-23 17:18:05,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:18:05,379 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 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 56 [2021-11-23 17:18:05,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:05,414 INFO L225 Difference]: With dead ends: 5990 [2021-11-23 17:18:05,415 INFO L226 Difference]: Without dead ends: 4680 [2021-11-23 17:18:05,418 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:18:05,419 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 538 mSDsluCounter, 581 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 538 SdHoareTripleChecker+Valid, 712 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:05,419 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [538 Valid, 712 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:18:05,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4680 states. [2021-11-23 17:18:05,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4680 to 2648. [2021-11-23 17:18:05,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2648 states, 2647 states have (on average 1.5137891953154514) internal successors, (4007), 2647 states have internal predecessors, (4007), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:05,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2648 states to 2648 states and 4007 transitions. [2021-11-23 17:18:05,632 INFO L78 Accepts]: Start accepts. Automaton has 2648 states and 4007 transitions. Word has length 56 [2021-11-23 17:18:05,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:05,633 INFO L470 AbstractCegarLoop]: Abstraction has 2648 states and 4007 transitions. [2021-11-23 17:18:05,633 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:05,633 INFO L276 IsEmpty]: Start isEmpty. Operand 2648 states and 4007 transitions. [2021-11-23 17:18:05,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 17:18:05,635 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:05,635 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:05,656 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:05,849 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:05,849 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:05,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:05,850 INFO L85 PathProgramCache]: Analyzing trace with hash 1806755418, now seen corresponding path program 1 times [2021-11-23 17:18:05,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:05,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1280276818] [2021-11-23 17:18:05,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:05,851 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:05,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:05,852 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:05,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:18:05,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:05,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:18:05,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:06,092 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:06,092 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:06,093 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:06,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1280276818] [2021-11-23 17:18:06,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1280276818] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:06,093 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:06,093 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:18:06,094 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74063926] [2021-11-23 17:18:06,094 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:06,094 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:18:06,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:06,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:18:06,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:18:06,096 INFO L87 Difference]: Start difference. First operand 2648 states and 4007 transitions. Second operand has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:06,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:06,464 INFO L93 Difference]: Finished difference Result 5522 states and 8240 transitions. [2021-11-23 17:18:06,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:18:06,465 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-23 17:18:06,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:06,507 INFO L225 Difference]: With dead ends: 5522 [2021-11-23 17:18:06,507 INFO L226 Difference]: Without dead ends: 5520 [2021-11-23 17:18:06,513 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:18:06,517 INFO L933 BasicCegarLoop]: 197 mSDtfsCounter, 288 mSDsluCounter, 395 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 592 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:06,517 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [288 Valid, 592 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:18:06,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5520 states. [2021-11-23 17:18:06,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5520 to 2840. [2021-11-23 17:18:06,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2840 states, 2839 states have (on average 1.4790419161676647) internal successors, (4199), 2839 states have internal predecessors, (4199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:06,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2840 states to 2840 states and 4199 transitions. [2021-11-23 17:18:06,809 INFO L78 Accepts]: Start accepts. Automaton has 2840 states and 4199 transitions. Word has length 57 [2021-11-23 17:18:06,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:06,810 INFO L470 AbstractCegarLoop]: Abstraction has 2840 states and 4199 transitions. [2021-11-23 17:18:06,811 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:06,811 INFO L276 IsEmpty]: Start isEmpty. Operand 2840 states and 4199 transitions. [2021-11-23 17:18:06,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-23 17:18:06,813 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:06,813 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:06,837 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:07,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:07,028 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:07,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:07,029 INFO L85 PathProgramCache]: Analyzing trace with hash 227421697, now seen corresponding path program 1 times [2021-11-23 17:18:07,030 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:07,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1668228192] [2021-11-23 17:18:07,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:07,030 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:07,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:07,031 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:07,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:18:07,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:07,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:18:07,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:07,295 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:07,296 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:07,296 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:07,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1668228192] [2021-11-23 17:18:07,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1668228192] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:07,297 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:07,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:18:07,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270840313] [2021-11-23 17:18:07,297 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:07,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:18:07,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:07,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:18:07,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:18:07,299 INFO L87 Difference]: Start difference. First operand 2840 states and 4199 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:07,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:07,634 INFO L93 Difference]: Finished difference Result 7692 states and 11321 transitions. [2021-11-23 17:18:07,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:18:07,635 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-23 17:18:07,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:07,668 INFO L225 Difference]: With dead ends: 7692 [2021-11-23 17:18:07,669 INFO L226 Difference]: Without dead ends: 4882 [2021-11-23 17:18:07,674 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:18:07,675 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 67 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:07,675 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 231 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:18:07,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4882 states. [2021-11-23 17:18:08,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4882 to 4824. [2021-11-23 17:18:08,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4824 states, 4823 states have (on average 1.4478540327596932) internal successors, (6983), 4823 states have internal predecessors, (6983), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:08,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4824 states to 4824 states and 6983 transitions. [2021-11-23 17:18:08,088 INFO L78 Accepts]: Start accepts. Automaton has 4824 states and 6983 transitions. Word has length 58 [2021-11-23 17:18:08,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:08,089 INFO L470 AbstractCegarLoop]: Abstraction has 4824 states and 6983 transitions. [2021-11-23 17:18:08,089 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:08,089 INFO L276 IsEmpty]: Start isEmpty. Operand 4824 states and 6983 transitions. [2021-11-23 17:18:08,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-23 17:18:08,091 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:08,092 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:08,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:08,306 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:08,307 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:08,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:08,307 INFO L85 PathProgramCache]: Analyzing trace with hash -2122531684, now seen corresponding path program 1 times [2021-11-23 17:18:08,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:08,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [73204386] [2021-11-23 17:18:08,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:08,308 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:08,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:08,310 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:08,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:18:08,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:08,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:18:08,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:08,575 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:08,575 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:08,576 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:08,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [73204386] [2021-11-23 17:18:08,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [73204386] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:08,576 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:08,576 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:18:08,577 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213469505] [2021-11-23 17:18:08,577 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:08,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:18:08,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:08,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:18:08,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:18:08,578 INFO L87 Difference]: Start difference. First operand 4824 states and 6983 transitions. Second operand has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:09,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:09,048 INFO L93 Difference]: Finished difference Result 9743 states and 14173 transitions. [2021-11-23 17:18:09,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:18:09,049 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-23 17:18:09,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:09,097 INFO L225 Difference]: With dead ends: 9743 [2021-11-23 17:18:09,097 INFO L226 Difference]: Without dead ends: 6932 [2021-11-23 17:18:09,103 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:18:09,104 INFO L933 BasicCegarLoop]: 211 mSDtfsCounter, 88 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:09,105 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 310 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:18:09,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6932 states. [2021-11-23 17:18:09,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6932 to 6930. [2021-11-23 17:18:09,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6930 states, 6929 states have (on average 1.4341174772694472) internal successors, (9937), 6929 states have internal predecessors, (9937), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:09,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6930 states to 6930 states and 9937 transitions. [2021-11-23 17:18:09,720 INFO L78 Accepts]: Start accepts. Automaton has 6930 states and 9937 transitions. Word has length 59 [2021-11-23 17:18:09,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:09,721 INFO L470 AbstractCegarLoop]: Abstraction has 6930 states and 9937 transitions. [2021-11-23 17:18:09,721 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:09,721 INFO L276 IsEmpty]: Start isEmpty. Operand 6930 states and 9937 transitions. [2021-11-23 17:18:09,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 17:18:09,727 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:09,728 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:09,743 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:09,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:09,942 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:09,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:09,943 INFO L85 PathProgramCache]: Analyzing trace with hash -1504297558, now seen corresponding path program 1 times [2021-11-23 17:18:09,943 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:09,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1269929093] [2021-11-23 17:18:09,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:09,944 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:09,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:09,945 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:09,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 17:18:10,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:10,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:18:10,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:10,229 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:10,229 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:10,229 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:10,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1269929093] [2021-11-23 17:18:10,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1269929093] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:10,230 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:10,230 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:18:10,230 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651782998] [2021-11-23 17:18:10,231 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:10,231 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:18:10,231 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:10,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:18:10,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:18:10,233 INFO L87 Difference]: Start difference. First operand 6930 states and 9937 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:10,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:10,614 INFO L93 Difference]: Finished difference Result 11959 states and 17205 transitions. [2021-11-23 17:18:10,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:18:10,615 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-23 17:18:10,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:10,637 INFO L225 Difference]: With dead ends: 11959 [2021-11-23 17:18:10,638 INFO L226 Difference]: Without dead ends: 5061 [2021-11-23 17:18:10,648 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:18:10,649 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 71 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:10,650 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 284 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:18:10,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5061 states. [2021-11-23 17:18:11,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5061 to 5059. [2021-11-23 17:18:11,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5059 states, 5058 states have (on average 1.429616449189403) internal successors, (7231), 5058 states have internal predecessors, (7231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:11,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5059 states to 5059 states and 7231 transitions. [2021-11-23 17:18:11,042 INFO L78 Accepts]: Start accepts. Automaton has 5059 states and 7231 transitions. Word has length 82 [2021-11-23 17:18:11,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:11,042 INFO L470 AbstractCegarLoop]: Abstraction has 5059 states and 7231 transitions. [2021-11-23 17:18:11,042 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:11,043 INFO L276 IsEmpty]: Start isEmpty. Operand 5059 states and 7231 transitions. [2021-11-23 17:18:11,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:18:11,047 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:11,047 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:11,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:11,260 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:11,261 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:11,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:11,262 INFO L85 PathProgramCache]: Analyzing trace with hash -90302852, now seen corresponding path program 1 times [2021-11-23 17:18:11,262 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:11,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2075747979] [2021-11-23 17:18:11,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:11,263 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:11,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:11,264 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:11,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 17:18:11,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:11,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:18:11,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:13,199 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:13,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:13,988 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:13,989 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:13,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2075747979] [2021-11-23 17:18:13,989 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2075747979] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:13,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1368960387] [2021-11-23 17:18:13,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:13,990 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:13,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:13,993 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:14,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-23 17:18:14,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:14,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:18:14,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:15,772 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:15,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:16,349 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:16,349 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1368960387] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:16,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1971285456] [2021-11-23 17:18:16,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:16,350 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:16,350 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:16,352 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:16,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 17:18:16,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:16,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:18:16,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:17,740 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:17,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:18,308 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:18,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1971285456] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:18,309 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:18,310 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:18:18,310 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882185295] [2021-11-23 17:18:18,310 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:18,311 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:18:18,311 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:18,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:18:18,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:18:18,312 INFO L87 Difference]: Start difference. First operand 5059 states and 7231 transitions. Second operand has 16 states, 16 states have (on average 9.8125) internal successors, (157), 15 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:18,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:18,818 INFO L93 Difference]: Finished difference Result 8030 states and 11461 transitions. [2021-11-23 17:18:18,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:18:18,819 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.8125) internal successors, (157), 15 states have internal predecessors, (157), 0 states have call successors, (0), 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 83 [2021-11-23 17:18:18,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:18,833 INFO L225 Difference]: With dead ends: 8030 [2021-11-23 17:18:18,833 INFO L226 Difference]: Without dead ends: 5468 [2021-11-23 17:18:18,839 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 478 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:18:18,840 INFO L933 BasicCegarLoop]: 128 mSDtfsCounter, 124 mSDsluCounter, 1041 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 1169 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 64 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:18,840 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [124 Valid, 1169 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 66 Invalid, 0 Unknown, 64 Unchecked, 0.1s Time] [2021-11-23 17:18:18,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5468 states. [2021-11-23 17:18:19,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5468 to 5105. [2021-11-23 17:18:19,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5105 states, 5104 states have (on average 1.4286833855799372) internal successors, (7292), 5104 states have internal predecessors, (7292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:19,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5105 states to 5105 states and 7292 transitions. [2021-11-23 17:18:19,152 INFO L78 Accepts]: Start accepts. Automaton has 5105 states and 7292 transitions. Word has length 83 [2021-11-23 17:18:19,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:19,153 INFO L470 AbstractCegarLoop]: Abstraction has 5105 states and 7292 transitions. [2021-11-23 17:18:19,154 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.8125) internal successors, (157), 15 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:19,154 INFO L276 IsEmpty]: Start isEmpty. Operand 5105 states and 7292 transitions. [2021-11-23 17:18:19,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:18:19,158 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:19,159 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:19,177 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:19,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:19,600 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:19,791 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:19,791 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:19,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:19,792 INFO L85 PathProgramCache]: Analyzing trace with hash 333343870, now seen corresponding path program 1 times [2021-11-23 17:18:19,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:19,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [597744466] [2021-11-23 17:18:19,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:19,793 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:19,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:19,794 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:19,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 17:18:19,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:19,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:18:19,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:20,368 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:18:20,368 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:20,368 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:20,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [597744466] [2021-11-23 17:18:20,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [597744466] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:20,369 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:20,369 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:18:20,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536768689] [2021-11-23 17:18:20,370 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:20,370 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:18:20,370 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:20,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:18:20,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:18:20,371 INFO L87 Difference]: Start difference. First operand 5105 states and 7292 transitions. Second operand has 6 states, 6 states have (on average 13.0) internal successors, (78), 5 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:20,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:20,612 INFO L93 Difference]: Finished difference Result 7701 states and 11029 transitions. [2021-11-23 17:18:20,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:18:20,613 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 5 states have internal predecessors, (78), 0 states have call successors, (0), 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 83 [2021-11-23 17:18:20,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:20,625 INFO L225 Difference]: With dead ends: 7701 [2021-11-23 17:18:20,626 INFO L226 Difference]: Without dead ends: 5107 [2021-11-23 17:18:20,631 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:18:20,633 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 49 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 19 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:20,633 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 253 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 19 Unchecked, 0.0s Time] [2021-11-23 17:18:20,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5107 states. [2021-11-23 17:18:20,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5107 to 5105. [2021-11-23 17:18:20,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5105 states, 5104 states have (on average 1.428487460815047) internal successors, (7291), 5104 states have internal predecessors, (7291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:20,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5105 states to 5105 states and 7291 transitions. [2021-11-23 17:18:20,963 INFO L78 Accepts]: Start accepts. Automaton has 5105 states and 7291 transitions. Word has length 83 [2021-11-23 17:18:20,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:20,963 INFO L470 AbstractCegarLoop]: Abstraction has 5105 states and 7291 transitions. [2021-11-23 17:18:20,964 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 5 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:20,964 INFO L276 IsEmpty]: Start isEmpty. Operand 5105 states and 7291 transitions. [2021-11-23 17:18:20,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:18:20,968 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:20,969 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:20,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:21,182 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:21,182 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:21,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:21,183 INFO L85 PathProgramCache]: Analyzing trace with hash -716220394, now seen corresponding path program 1 times [2021-11-23 17:18:21,183 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:21,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1027934910] [2021-11-23 17:18:21,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:21,184 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:21,184 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:21,185 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:21,195 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 17:18:21,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:21,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:18:21,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:22,219 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:22,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:22,936 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:22,936 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:22,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1027934910] [2021-11-23 17:18:22,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1027934910] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:22,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2027049930] [2021-11-23 17:18:22,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:22,937 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:22,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:22,943 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:22,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-11-23 17:18:23,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:23,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:18:23,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:24,024 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:24,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:24,616 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:24,616 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2027049930] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:24,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1489388599] [2021-11-23 17:18:24,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:24,617 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:24,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:24,619 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:24,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 17:18:24,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:24,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:18:24,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:25,496 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:25,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:26,072 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:26,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1489388599] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:26,072 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:26,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:18:26,073 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708260408] [2021-11-23 17:18:26,073 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:26,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:18:26,074 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:26,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:18:26,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:18:26,076 INFO L87 Difference]: Start difference. First operand 5105 states and 7291 transitions. Second operand has 16 states, 16 states have (on average 9.0625) internal successors, (145), 15 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:26,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:26,403 INFO L93 Difference]: Finished difference Result 6569 states and 9335 transitions. [2021-11-23 17:18:26,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:18:26,404 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.0625) internal successors, (145), 15 states have internal predecessors, (145), 0 states have call successors, (0), 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 83 [2021-11-23 17:18:26,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:26,416 INFO L225 Difference]: With dead ends: 6569 [2021-11-23 17:18:26,416 INFO L226 Difference]: Without dead ends: 5255 [2021-11-23 17:18:26,421 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 479 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:18:26,422 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 74 mSDsluCounter, 990 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 1109 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 134 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:26,423 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 1109 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 68 Invalid, 0 Unknown, 134 Unchecked, 0.1s Time] [2021-11-23 17:18:26,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5255 states. [2021-11-23 17:18:26,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5255 to 5125. [2021-11-23 17:18:26,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5125 states, 5124 states have (on average 1.4272053083528493) internal successors, (7313), 5124 states have internal predecessors, (7313), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:26,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5125 states to 5125 states and 7313 transitions. [2021-11-23 17:18:26,692 INFO L78 Accepts]: Start accepts. Automaton has 5125 states and 7313 transitions. Word has length 83 [2021-11-23 17:18:26,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:26,692 INFO L470 AbstractCegarLoop]: Abstraction has 5125 states and 7313 transitions. [2021-11-23 17:18:26,693 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.0625) internal successors, (145), 15 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:26,693 INFO L276 IsEmpty]: Start isEmpty. Operand 5125 states and 7313 transitions. [2021-11-23 17:18:26,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:18:26,697 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:26,697 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:26,741 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-11-23 17:18:26,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:27,112 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:27,311 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:27,311 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:27,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:27,312 INFO L85 PathProgramCache]: Analyzing trace with hash -1110587180, now seen corresponding path program 1 times [2021-11-23 17:18:27,312 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:27,313 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1490473626] [2021-11-23 17:18:27,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:27,313 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:27,342 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:27,343 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:27,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 17:18:27,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:27,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:18:27,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:27,874 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:18:27,875 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:27,875 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:27,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1490473626] [2021-11-23 17:18:27,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1490473626] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:27,876 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:27,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:18:27,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1894777127] [2021-11-23 17:18:27,876 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:27,876 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:18:27,876 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:27,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:18:27,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:18:27,878 INFO L87 Difference]: Start difference. First operand 5125 states and 7313 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 5 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:28,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:28,109 INFO L93 Difference]: Finished difference Result 6453 states and 9218 transitions. [2021-11-23 17:18:28,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:18:28,110 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 5 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-23 17:18:28,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:28,123 INFO L225 Difference]: With dead ends: 6453 [2021-11-23 17:18:28,124 INFO L226 Difference]: Without dead ends: 5127 [2021-11-23 17:18:28,130 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:18:28,131 INFO L933 BasicCegarLoop]: 116 mSDtfsCounter, 57 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 249 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:28,131 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 249 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 21 Unchecked, 0.0s Time] [2021-11-23 17:18:28,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5127 states. [2021-11-23 17:18:28,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5127 to 5125. [2021-11-23 17:18:28,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5125 states, 5124 states have (on average 1.4270101483216238) internal successors, (7312), 5124 states have internal predecessors, (7312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:28,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5125 states to 5125 states and 7312 transitions. [2021-11-23 17:18:28,354 INFO L78 Accepts]: Start accepts. Automaton has 5125 states and 7312 transitions. Word has length 83 [2021-11-23 17:18:28,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:28,354 INFO L470 AbstractCegarLoop]: Abstraction has 5125 states and 7312 transitions. [2021-11-23 17:18:28,355 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 5 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:28,355 INFO L276 IsEmpty]: Start isEmpty. Operand 5125 states and 7312 transitions. [2021-11-23 17:18:28,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:18:28,359 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:28,360 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:28,377 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:28,572 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:28,573 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:28,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:28,574 INFO L85 PathProgramCache]: Analyzing trace with hash -589010986, now seen corresponding path program 1 times [2021-11-23 17:18:28,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:28,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [851035334] [2021-11-23 17:18:28,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:28,575 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:28,575 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:28,576 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:28,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 17:18:28,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:28,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:18:28,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:29,898 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:29,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:30,430 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:30,430 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:30,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [851035334] [2021-11-23 17:18:30,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [851035334] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:30,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [684456907] [2021-11-23 17:18:30,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:30,431 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:30,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:30,432 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:30,433 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-23 17:18:30,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:30,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:18:30,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:31,703 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:31,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:32,024 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:32,025 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [684456907] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:32,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1667257490] [2021-11-23 17:18:32,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:32,025 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:32,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:32,027 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:32,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 17:18:32,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:32,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:18:32,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:33,254 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:33,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:33,661 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:33,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1667257490] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:33,662 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:33,663 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:18:33,663 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755026309] [2021-11-23 17:18:33,663 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:33,664 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:18:33,664 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:33,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:18:33,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:18:33,665 INFO L87 Difference]: Start difference. First operand 5125 states and 7312 transitions. Second operand has 16 states, 16 states have (on average 9.5625) internal successors, (153), 15 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:34,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:34,427 INFO L93 Difference]: Finished difference Result 14433 states and 20735 transitions. [2021-11-23 17:18:34,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:18:34,427 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.5625) internal successors, (153), 15 states have internal predecessors, (153), 0 states have call successors, (0), 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 83 [2021-11-23 17:18:34,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:34,453 INFO L225 Difference]: With dead ends: 14433 [2021-11-23 17:18:34,453 INFO L226 Difference]: Without dead ends: 10687 [2021-11-23 17:18:34,460 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 478 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:18:34,461 INFO L933 BasicCegarLoop]: 244 mSDtfsCounter, 231 mSDsluCounter, 1965 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 2209 SdHoareTripleChecker+Invalid, 490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 266 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:34,462 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [231 Valid, 2209 Invalid, 490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 221 Invalid, 0 Unknown, 266 Unchecked, 0.2s Time] [2021-11-23 17:18:34,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10687 states. [2021-11-23 17:18:34,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10687 to 9139. [2021-11-23 17:18:34,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9139 states, 9138 states have (on average 1.4220836069161742) internal successors, (12995), 9138 states have internal predecessors, (12995), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:34,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9139 states to 9139 states and 12995 transitions. [2021-11-23 17:18:34,973 INFO L78 Accepts]: Start accepts. Automaton has 9139 states and 12995 transitions. Word has length 83 [2021-11-23 17:18:34,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:34,973 INFO L470 AbstractCegarLoop]: Abstraction has 9139 states and 12995 transitions. [2021-11-23 17:18:34,973 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.5625) internal successors, (153), 15 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:34,974 INFO L276 IsEmpty]: Start isEmpty. Operand 9139 states and 12995 transitions. [2021-11-23 17:18:34,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:18:34,983 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:34,983 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:34,987 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:35,210 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:35,394 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:35,586 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:35,586 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:35,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:35,587 INFO L85 PathProgramCache]: Analyzing trace with hash 1339261716, now seen corresponding path program 1 times [2021-11-23 17:18:35,587 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:35,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1820791734] [2021-11-23 17:18:35,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:35,588 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:35,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:35,603 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:35,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:18:35,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:35,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:18:35,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:36,072 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:18:36,072 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:36,073 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:36,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1820791734] [2021-11-23 17:18:36,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1820791734] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:36,073 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:36,073 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:18:36,074 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015517396] [2021-11-23 17:18:36,074 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:36,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:18:36,075 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:36,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:18:36,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:18:36,075 INFO L87 Difference]: Start difference. First operand 9139 states and 12995 transitions. Second operand has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 5 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:36,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:36,417 INFO L93 Difference]: Finished difference Result 15136 states and 21588 transitions. [2021-11-23 17:18:36,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:18:36,418 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 5 states have internal predecessors, (77), 0 states have call successors, (0), 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 83 [2021-11-23 17:18:36,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:36,436 INFO L225 Difference]: With dead ends: 15136 [2021-11-23 17:18:36,436 INFO L226 Difference]: Without dead ends: 9139 [2021-11-23 17:18:36,445 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:18:36,446 INFO L933 BasicCegarLoop]: 123 mSDtfsCounter, 44 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 16 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:36,446 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 245 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 28 Invalid, 0 Unknown, 16 Unchecked, 0.0s Time] [2021-11-23 17:18:36,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9139 states. [2021-11-23 17:18:37,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9139 to 9139. [2021-11-23 17:18:37,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9139 states, 9138 states have (on average 1.4219741737798206) internal successors, (12994), 9138 states have internal predecessors, (12994), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:37,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9139 states to 9139 states and 12994 transitions. [2021-11-23 17:18:37,046 INFO L78 Accepts]: Start accepts. Automaton has 9139 states and 12994 transitions. Word has length 83 [2021-11-23 17:18:37,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:37,046 INFO L470 AbstractCegarLoop]: Abstraction has 9139 states and 12994 transitions. [2021-11-23 17:18:37,047 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 5 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:37,047 INFO L276 IsEmpty]: Start isEmpty. Operand 9139 states and 12994 transitions. [2021-11-23 17:18:37,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:18:37,053 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:37,054 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:37,071 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:37,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:37,267 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:37,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:37,268 INFO L85 PathProgramCache]: Analyzing trace with hash -1970609869, now seen corresponding path program 1 times [2021-11-23 17:18:37,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:37,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1137254490] [2021-11-23 17:18:37,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:37,269 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:37,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:37,270 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:37,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 17:18:37,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:37,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:18:37,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:37,669 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:37,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:37,822 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:37,823 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:37,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1137254490] [2021-11-23 17:18:37,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1137254490] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:37,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [78303047] [2021-11-23 17:18:37,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:37,823 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:37,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:37,824 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:37,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-23 17:18:37,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:37,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:18:37,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:38,212 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:38,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:38,348 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:38,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [78303047] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:38,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2047034070] [2021-11-23 17:18:38,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:38,349 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:38,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:38,350 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:38,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-23 17:18:38,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:38,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:18:38,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:39,626 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:39,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:40,217 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:40,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2047034070] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:40,218 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:40,218 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 8, 8] total 22 [2021-11-23 17:18:40,218 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503821376] [2021-11-23 17:18:40,218 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:40,219 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 17:18:40,219 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:40,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 17:18:40,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=393, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:18:40,221 INFO L87 Difference]: Start difference. First operand 9139 states and 12994 transitions. Second operand has 22 states, 22 states have (on average 12.909090909090908) internal successors, (284), 22 states have internal predecessors, (284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:40,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:40,861 INFO L93 Difference]: Finished difference Result 13932 states and 19862 transitions. [2021-11-23 17:18:40,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 17:18:40,862 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 12.909090909090908) internal successors, (284), 22 states have internal predecessors, (284), 0 states have call successors, (0), 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 84 [2021-11-23 17:18:40,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:40,876 INFO L225 Difference]: With dead ends: 13932 [2021-11-23 17:18:40,876 INFO L226 Difference]: Without dead ends: 9178 [2021-11-23 17:18:40,884 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 481 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=136, Invalid=734, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:18:40,885 INFO L933 BasicCegarLoop]: 116 mSDtfsCounter, 73 mSDsluCounter, 1609 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 1725 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 119 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:40,885 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 1725 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 152 Invalid, 0 Unknown, 119 Unchecked, 0.1s Time] [2021-11-23 17:18:40,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9178 states. [2021-11-23 17:18:41,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9178 to 9139. [2021-11-23 17:18:41,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9139 states, 9138 states have (on average 1.4218647406434668) internal successors, (12993), 9138 states have internal predecessors, (12993), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:41,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9139 states to 9139 states and 12993 transitions. [2021-11-23 17:18:41,359 INFO L78 Accepts]: Start accepts. Automaton has 9139 states and 12993 transitions. Word has length 84 [2021-11-23 17:18:41,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:41,360 INFO L470 AbstractCegarLoop]: Abstraction has 9139 states and 12993 transitions. [2021-11-23 17:18:41,360 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 12.909090909090908) internal successors, (284), 22 states have internal predecessors, (284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:41,360 INFO L276 IsEmpty]: Start isEmpty. Operand 9139 states and 12993 transitions. [2021-11-23 17:18:41,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:18:41,371 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:41,371 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:41,373 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:41,598 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:41,781 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:41,973 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:41,974 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:41,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:41,974 INFO L85 PathProgramCache]: Analyzing trace with hash 1851728055, now seen corresponding path program 1 times [2021-11-23 17:18:41,974 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:41,974 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [600134335] [2021-11-23 17:18:41,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:41,975 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:41,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:41,976 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:41,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 17:18:42,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:42,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:18:42,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:42,326 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:42,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:42,482 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:42,482 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:42,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [600134335] [2021-11-23 17:18:42,482 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [600134335] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:42,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [138652210] [2021-11-23 17:18:42,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:42,483 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:42,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:42,484 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:42,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-23 17:18:42,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:42,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:18:42,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:42,955 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:42,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:43,093 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:43,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [138652210] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:43,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41946993] [2021-11-23 17:18:43,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:43,093 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:43,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:43,095 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:43,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-23 17:18:43,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:43,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:18:43,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:44,457 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:44,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:45,030 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:45,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [41946993] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:45,030 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:45,030 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 8, 8] total 22 [2021-11-23 17:18:45,031 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450849012] [2021-11-23 17:18:45,031 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:45,032 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 17:18:45,032 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:45,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 17:18:45,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=393, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:18:45,033 INFO L87 Difference]: Start difference. First operand 9139 states and 12993 transitions. Second operand has 22 states, 22 states have (on average 13.090909090909092) internal successors, (288), 22 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:45,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:45,604 INFO L93 Difference]: Finished difference Result 14122 states and 20060 transitions. [2021-11-23 17:18:45,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 17:18:45,604 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 13.090909090909092) internal successors, (288), 22 states have internal predecessors, (288), 0 states have call successors, (0), 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 84 [2021-11-23 17:18:45,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:45,616 INFO L225 Difference]: With dead ends: 14122 [2021-11-23 17:18:45,617 INFO L226 Difference]: Without dead ends: 9368 [2021-11-23 17:18:45,623 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 481 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=136, Invalid=734, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:18:45,624 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 223 mSDsluCounter, 1299 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 1424 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 129 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:45,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [223 Valid, 1424 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 131 Invalid, 0 Unknown, 129 Unchecked, 0.1s Time] [2021-11-23 17:18:45,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9368 states. [2021-11-23 17:18:46,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9368 to 9139. [2021-11-23 17:18:46,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9139 states, 9138 states have (on average 1.4217553075071132) internal successors, (12992), 9138 states have internal predecessors, (12992), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:46,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9139 states to 9139 states and 12992 transitions. [2021-11-23 17:18:46,053 INFO L78 Accepts]: Start accepts. Automaton has 9139 states and 12992 transitions. Word has length 84 [2021-11-23 17:18:46,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:46,054 INFO L470 AbstractCegarLoop]: Abstraction has 9139 states and 12992 transitions. [2021-11-23 17:18:46,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 13.090909090909092) internal successors, (288), 22 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:46,054 INFO L276 IsEmpty]: Start isEmpty. Operand 9139 states and 12992 transitions. [2021-11-23 17:18:46,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:18:46,061 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:46,062 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:46,107 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:46,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:46,477 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:46,675 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:46,675 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:46,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:46,676 INFO L85 PathProgramCache]: Analyzing trace with hash -65119699, now seen corresponding path program 1 times [2021-11-23 17:18:46,676 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:46,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1966595615] [2021-11-23 17:18:46,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:46,677 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:46,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:46,678 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:46,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 17:18:46,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:46,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:18:46,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:46,921 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:46,922 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:46,922 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:46,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1966595615] [2021-11-23 17:18:46,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1966595615] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:46,922 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:46,923 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:18:46,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900988789] [2021-11-23 17:18:46,923 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:46,923 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:18:46,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:46,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:18:46,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:18:46,924 INFO L87 Difference]: Start difference. First operand 9139 states and 12992 transitions. Second operand has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:47,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:47,164 INFO L93 Difference]: Finished difference Result 13561 states and 19312 transitions. [2021-11-23 17:18:47,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:18:47,164 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 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 84 [2021-11-23 17:18:47,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:47,168 INFO L225 Difference]: With dead ends: 13561 [2021-11-23 17:18:47,169 INFO L226 Difference]: Without dead ends: 4727 [2021-11-23 17:18:47,174 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:18:47,175 INFO L933 BasicCegarLoop]: 163 mSDtfsCounter, 60 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:47,175 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 268 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:18:47,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4727 states. [2021-11-23 17:18:47,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4727 to 4207. [2021-11-23 17:18:47,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4207 states, 4206 states have (on average 1.3951497860199715) internal successors, (5868), 4206 states have internal predecessors, (5868), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:47,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4207 states to 4207 states and 5868 transitions. [2021-11-23 17:18:47,328 INFO L78 Accepts]: Start accepts. Automaton has 4207 states and 5868 transitions. Word has length 84 [2021-11-23 17:18:47,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:47,328 INFO L470 AbstractCegarLoop]: Abstraction has 4207 states and 5868 transitions. [2021-11-23 17:18:47,328 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:47,328 INFO L276 IsEmpty]: Start isEmpty. Operand 4207 states and 5868 transitions. [2021-11-23 17:18:47,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:18:47,332 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:47,333 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:47,349 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:47,546 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:47,546 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:47,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:47,547 INFO L85 PathProgramCache]: Analyzing trace with hash 1511926343, now seen corresponding path program 1 times [2021-11-23 17:18:47,547 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:47,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1491507818] [2021-11-23 17:18:47,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:47,548 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:47,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:47,549 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:47,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 17:18:47,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:47,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:18:47,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:47,975 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:47,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:48,146 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:48,146 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:48,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1491507818] [2021-11-23 17:18:48,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1491507818] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:48,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [290603151] [2021-11-23 17:18:48,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:48,147 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:48,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:48,148 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:48,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-23 17:18:48,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:48,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:18:48,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:48,384 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:48,384 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:48,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [290603151] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:48,384 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:18:48,385 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5, 5] total 10 [2021-11-23 17:18:48,385 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800838637] [2021-11-23 17:18:48,385 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:48,385 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:18:48,385 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:48,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:18:48,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-23 17:18:48,386 INFO L87 Difference]: Start difference. First operand 4207 states and 5868 transitions. Second operand has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:48,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:48,659 INFO L93 Difference]: Finished difference Result 6681 states and 9310 transitions. [2021-11-23 17:18:48,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:18:48,660 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 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 84 [2021-11-23 17:18:48,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:48,668 INFO L225 Difference]: With dead ends: 6681 [2021-11-23 17:18:48,669 INFO L226 Difference]: Without dead ends: 5601 [2021-11-23 17:18:48,672 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 241 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-23 17:18:48,674 INFO L933 BasicCegarLoop]: 176 mSDtfsCounter, 67 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 295 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:48,674 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 295 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:18:48,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5601 states. [2021-11-23 17:18:48,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5601 to 4876. [2021-11-23 17:18:48,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4876 states, 4875 states have (on average 1.3837948717948718) internal successors, (6746), 4875 states have internal predecessors, (6746), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:48,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4876 states to 4876 states and 6746 transitions. [2021-11-23 17:18:48,965 INFO L78 Accepts]: Start accepts. Automaton has 4876 states and 6746 transitions. Word has length 84 [2021-11-23 17:18:48,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:48,965 INFO L470 AbstractCegarLoop]: Abstraction has 4876 states and 6746 transitions. [2021-11-23 17:18:48,965 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:48,966 INFO L276 IsEmpty]: Start isEmpty. Operand 4876 states and 6746 transitions. [2021-11-23 17:18:48,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:18:48,970 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:48,971 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:48,989 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:49,185 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:49,384 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:49,384 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:49,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:49,385 INFO L85 PathProgramCache]: Analyzing trace with hash -1984772903, now seen corresponding path program 1 times [2021-11-23 17:18:49,385 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:49,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1668259872] [2021-11-23 17:18:49,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:49,385 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:49,386 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:49,386 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:49,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-23 17:18:49,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:49,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:18:49,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:49,757 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:49,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:49,919 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:49,919 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:49,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1668259872] [2021-11-23 17:18:49,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1668259872] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:49,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2126123551] [2021-11-23 17:18:49,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:49,919 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:49,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:49,920 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:49,921 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-11-23 17:18:50,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:50,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:18:50,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:50,384 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:50,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:50,535 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:50,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2126123551] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:50,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [270149941] [2021-11-23 17:18:50,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:50,536 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:50,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:50,537 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:50,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-23 17:18:50,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:50,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:18:50,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:51,015 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:51,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:51,378 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:51,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [270149941] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:51,379 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:51,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 6, 6] total 18 [2021-11-23 17:18:51,379 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475597764] [2021-11-23 17:18:51,379 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:51,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:18:51,380 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:51,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:18:51,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:18:51,381 INFO L87 Difference]: Start difference. First operand 4876 states and 6746 transitions. Second operand has 18 states, 18 states have (on average 16.0) internal successors, (288), 18 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:52,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:52,786 INFO L93 Difference]: Finished difference Result 15720 states and 21736 transitions. [2021-11-23 17:18:52,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 17:18:52,790 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 16.0) internal successors, (288), 18 states have internal predecessors, (288), 0 states have call successors, (0), 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 84 [2021-11-23 17:18:52,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:52,808 INFO L225 Difference]: With dead ends: 15720 [2021-11-23 17:18:52,808 INFO L226 Difference]: Without dead ends: 11142 [2021-11-23 17:18:52,818 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 482 SyntacticMatches, 8 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=214, Invalid=598, Unknown=0, NotChecked=0, Total=812 [2021-11-23 17:18:52,820 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 2799 mSDsluCounter, 845 mSDsCounter, 0 mSdLazyCounter, 457 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2799 SdHoareTripleChecker+Valid, 955 SdHoareTripleChecker+Invalid, 537 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 457 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 3 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:52,820 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2799 Valid, 955 Invalid, 537 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 457 Invalid, 0 Unknown, 3 Unchecked, 0.4s Time] [2021-11-23 17:18:52,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11142 states. [2021-11-23 17:18:53,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11142 to 5989. [2021-11-23 17:18:53,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5989 states, 5988 states have (on average 1.3770875083500334) internal successors, (8246), 5988 states have internal predecessors, (8246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:53,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5989 states to 5989 states and 8246 transitions. [2021-11-23 17:18:53,206 INFO L78 Accepts]: Start accepts. Automaton has 5989 states and 8246 transitions. Word has length 84 [2021-11-23 17:18:53,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:53,206 INFO L470 AbstractCegarLoop]: Abstraction has 5989 states and 8246 transitions. [2021-11-23 17:18:53,206 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 16.0) internal successors, (288), 18 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:53,207 INFO L276 IsEmpty]: Start isEmpty. Operand 5989 states and 8246 transitions. [2021-11-23 17:18:53,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:18:53,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:53,212 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:53,226 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:53,451 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:53,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (35)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:53,826 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:53,826 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:53,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:53,827 INFO L85 PathProgramCache]: Analyzing trace with hash 1233157079, now seen corresponding path program 1 times [2021-11-23 17:18:53,827 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:53,827 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [945595605] [2021-11-23 17:18:53,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:53,827 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:53,827 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:53,828 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:53,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-23 17:18:53,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:53,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:18:53,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:54,156 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:18:54,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:54,389 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:18:54,389 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:54,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [945595605] [2021-11-23 17:18:54,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [945595605] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:54,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [532749802] [2021-11-23 17:18:54,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:54,390 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:54,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:54,396 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:54,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-23 17:18:54,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:54,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:18:54,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:54,821 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:18:54,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:55,045 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:18:55,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [532749802] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:55,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1273687967] [2021-11-23 17:18:55,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:55,046 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:55,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:55,049 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:55,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-23 17:18:55,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:55,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:18:55,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:55,561 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:18:55,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:55,984 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:55,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1273687967] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:55,984 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:55,984 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 5] total 7 [2021-11-23 17:18:55,984 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680248715] [2021-11-23 17:18:55,985 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:55,985 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:18:55,985 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:55,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:18:55,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:18:55,986 INFO L87 Difference]: Start difference. First operand 5989 states and 8246 transitions. Second operand has 7 states, 7 states have (on average 30.0) internal successors, (210), 7 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:56,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:56,761 INFO L93 Difference]: Finished difference Result 24222 states and 33425 transitions. [2021-11-23 17:18:56,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 17:18:56,761 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 30.0) internal successors, (210), 7 states have internal predecessors, (210), 0 states have call successors, (0), 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 84 [2021-11-23 17:18:56,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:56,785 INFO L225 Difference]: With dead ends: 24222 [2021-11-23 17:18:56,785 INFO L226 Difference]: Without dead ends: 18608 [2021-11-23 17:18:56,795 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 492 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:18:56,796 INFO L933 BasicCegarLoop]: 182 mSDtfsCounter, 523 mSDsluCounter, 738 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 523 SdHoareTripleChecker+Valid, 920 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:56,797 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [523 Valid, 920 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 31 Invalid, 0 Unknown, 9 Unchecked, 0.0s Time] [2021-11-23 17:18:56,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18608 states. [2021-11-23 17:18:57,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18608 to 17025. [2021-11-23 17:18:57,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17025 states, 17024 states have (on average 1.3797579887218046) internal successors, (23489), 17024 states have internal predecessors, (23489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:57,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17025 states to 17025 states and 23489 transitions. [2021-11-23 17:18:57,792 INFO L78 Accepts]: Start accepts. Automaton has 17025 states and 23489 transitions. Word has length 84 [2021-11-23 17:18:57,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:57,793 INFO L470 AbstractCegarLoop]: Abstraction has 17025 states and 23489 transitions. [2021-11-23 17:18:57,793 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 30.0) internal successors, (210), 7 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:57,793 INFO L276 IsEmpty]: Start isEmpty. Operand 17025 states and 23489 transitions. [2021-11-23 17:18:57,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:18:57,796 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:57,796 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:57,806 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:58,021 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:58,198 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:58,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:58,397 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:58,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:58,398 INFO L85 PathProgramCache]: Analyzing trace with hash -1557426839, now seen corresponding path program 1 times [2021-11-23 17:18:58,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:58,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [990311488] [2021-11-23 17:18:58,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:58,399 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:58,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:58,401 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:58,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-23 17:18:58,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:58,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:18:58,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:58,660 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:58,660 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:58,660 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:58,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [990311488] [2021-11-23 17:18:58,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [990311488] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:58,660 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:58,661 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:18:58,661 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031141326] [2021-11-23 17:18:58,661 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:58,661 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:18:58,662 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:58,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:18:58,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:18:58,662 INFO L87 Difference]: Start difference. First operand 17025 states and 23489 transitions. Second operand has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:59,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:59,586 INFO L93 Difference]: Finished difference Result 25065 states and 34505 transitions. [2021-11-23 17:18:59,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:18:59,586 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 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 84 [2021-11-23 17:18:59,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:59,607 INFO L225 Difference]: With dead ends: 25065 [2021-11-23 17:18:59,607 INFO L226 Difference]: Without dead ends: 17574 [2021-11-23 17:18:59,614 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:18:59,615 INFO L933 BasicCegarLoop]: 179 mSDtfsCounter, 67 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 300 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 [2021-11-23 17:18:59,616 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 300 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:18:59,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17574 states. [2021-11-23 17:19:00,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17574 to 16128. [2021-11-23 17:19:00,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16128 states, 16127 states have (on average 1.3646679481614683) internal successors, (22008), 16127 states have internal predecessors, (22008), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:00,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16128 states to 16128 states and 22008 transitions. [2021-11-23 17:19:00,574 INFO L78 Accepts]: Start accepts. Automaton has 16128 states and 22008 transitions. Word has length 84 [2021-11-23 17:19:00,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:00,574 INFO L470 AbstractCegarLoop]: Abstraction has 16128 states and 22008 transitions. [2021-11-23 17:19:00,574 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:00,575 INFO L276 IsEmpty]: Start isEmpty. Operand 16128 states and 22008 transitions. [2021-11-23 17:19:00,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:19:00,578 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:00,578 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:19:00,587 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Ended with exit code 0 [2021-11-23 17:19:00,778 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:19:00,779 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:00,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:00,779 INFO L85 PathProgramCache]: Analyzing trace with hash 1970708715, now seen corresponding path program 1 times [2021-11-23 17:19:00,780 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:00,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1666656251] [2021-11-23 17:19:00,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:00,780 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:00,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:00,781 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:00,783 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-23 17:19:00,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:00,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:19:00,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:01,003 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:01,004 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:19:01,004 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:01,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1666656251] [2021-11-23 17:19:01,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1666656251] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:19:01,004 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:19:01,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:19:01,005 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463170872] [2021-11-23 17:19:01,005 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:19:01,005 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:19:01,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:01,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:19:01,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:19:01,006 INFO L87 Difference]: Start difference. First operand 16128 states and 22008 transitions. Second operand has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:02,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:02,207 INFO L93 Difference]: Finished difference Result 38012 states and 51901 transitions. [2021-11-23 17:19:02,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:19:02,207 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 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 84 [2021-11-23 17:19:02,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:02,241 INFO L225 Difference]: With dead ends: 38012 [2021-11-23 17:19:02,241 INFO L226 Difference]: Without dead ends: 26788 [2021-11-23 17:19:02,251 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:19:02,252 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 64 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:02,252 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 261 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:19:02,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26788 states. [2021-11-23 17:19:03,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26788 to 26748. [2021-11-23 17:19:03,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26748 states, 26747 states have (on average 1.3513291210229184) internal successors, (36144), 26747 states have internal predecessors, (36144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:03,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26748 states to 26748 states and 36144 transitions. [2021-11-23 17:19:03,878 INFO L78 Accepts]: Start accepts. Automaton has 26748 states and 36144 transitions. Word has length 84 [2021-11-23 17:19:03,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:03,878 INFO L470 AbstractCegarLoop]: Abstraction has 26748 states and 36144 transitions. [2021-11-23 17:19:03,878 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:03,878 INFO L276 IsEmpty]: Start isEmpty. Operand 26748 states and 36144 transitions. [2021-11-23 17:19:03,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:19:03,882 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:03,882 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:19:03,891 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:04,083 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:19:04,083 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:04,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:04,084 INFO L85 PathProgramCache]: Analyzing trace with hash 1215602223, now seen corresponding path program 1 times [2021-11-23 17:19:04,084 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:04,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [914432481] [2021-11-23 17:19:04,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:04,085 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:04,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:04,085 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:04,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-23 17:19:04,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:04,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:19:04,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:04,441 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:04,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:04,604 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:04,604 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:04,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [914432481] [2021-11-23 17:19:04,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [914432481] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:04,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [852320131] [2021-11-23 17:19:04,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:04,605 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:04,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:04,606 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:04,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Waiting until timeout for monitored process [2021-11-23 17:19:04,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:04,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:19:04,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:05,078 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:05,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:05,222 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:05,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [852320131] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:05,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2069338687] [2021-11-23 17:19:05,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:05,223 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:05,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:19:05,224 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:19:05,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-23 17:19:05,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:05,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:19:05,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:05,758 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:05,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:06,057 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:06,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2069338687] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:06,058 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:19:06,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 6, 6] total 18 [2021-11-23 17:19:06,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842281513] [2021-11-23 17:19:06,058 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:19:06,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:19:06,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:06,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:19:06,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:19:06,060 INFO L87 Difference]: Start difference. First operand 26748 states and 36144 transitions. Second operand has 18 states, 18 states have (on average 15.555555555555555) internal successors, (280), 18 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:08,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:08,529 INFO L93 Difference]: Finished difference Result 57201 states and 76306 transitions. [2021-11-23 17:19:08,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:19:08,529 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 15.555555555555555) internal successors, (280), 18 states have internal predecessors, (280), 0 states have call successors, (0), 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 84 [2021-11-23 17:19:08,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:08,575 INFO L225 Difference]: With dead ends: 57201 [2021-11-23 17:19:08,575 INFO L226 Difference]: Without dead ends: 35401 [2021-11-23 17:19:08,590 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 482 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2021-11-23 17:19:08,591 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 2652 mSDsluCounter, 533 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2652 SdHoareTripleChecker+Valid, 629 SdHoareTripleChecker+Invalid, 373 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:08,591 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2652 Valid, 629 Invalid, 373 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 291 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 17:19:08,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35401 states. [2021-11-23 17:19:10,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35401 to 26480. [2021-11-23 17:19:10,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26480 states, 26479 states have (on average 1.33301861852789) internal successors, (35297), 26479 states have internal predecessors, (35297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:10,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26480 states to 26480 states and 35297 transitions. [2021-11-23 17:19:10,564 INFO L78 Accepts]: Start accepts. Automaton has 26480 states and 35297 transitions. Word has length 84 [2021-11-23 17:19:10,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:10,564 INFO L470 AbstractCegarLoop]: Abstraction has 26480 states and 35297 transitions. [2021-11-23 17:19:10,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 15.555555555555555) internal successors, (280), 18 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:10,565 INFO L276 IsEmpty]: Start isEmpty. Operand 26480 states and 35297 transitions. [2021-11-23 17:19:10,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:19:10,569 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:10,570 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:19:10,575 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:10,778 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Ended with exit code 0 [2021-11-23 17:19:10,995 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2021-11-23 17:19:11,170 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:11,171 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:11,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:11,171 INFO L85 PathProgramCache]: Analyzing trace with hash -264855873, now seen corresponding path program 1 times [2021-11-23 17:19:11,172 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:11,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [624766762] [2021-11-23 17:19:11,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:11,172 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:11,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:11,175 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:11,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-23 17:19:11,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:11,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:19:11,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:11,430 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:11,431 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:19:11,431 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:11,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [624766762] [2021-11-23 17:19:11,431 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [624766762] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:19:11,431 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:19:11,431 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:19:11,432 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930026168] [2021-11-23 17:19:11,432 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:19:11,432 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:19:11,433 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:11,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:19:11,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:19:11,434 INFO L87 Difference]: Start difference. First operand 26480 states and 35297 transitions. Second operand has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:13,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:13,224 INFO L93 Difference]: Finished difference Result 36786 states and 48837 transitions. [2021-11-23 17:19:13,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:19:13,225 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 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 84 [2021-11-23 17:19:13,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:13,257 INFO L225 Difference]: With dead ends: 36786 [2021-11-23 17:19:13,257 INFO L226 Difference]: Without dead ends: 26622 [2021-11-23 17:19:13,268 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:19:13,269 INFO L933 BasicCegarLoop]: 195 mSDtfsCounter, 66 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 316 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 [2021-11-23 17:19:13,269 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 316 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:19:13,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26622 states. [2021-11-23 17:19:14,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26622 to 26026. [2021-11-23 17:19:14,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26026 states, 26025 states have (on average 1.3131604226705091) internal successors, (34175), 26025 states have internal predecessors, (34175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:14,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26026 states to 26026 states and 34175 transitions. [2021-11-23 17:19:14,842 INFO L78 Accepts]: Start accepts. Automaton has 26026 states and 34175 transitions. Word has length 84 [2021-11-23 17:19:14,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:14,842 INFO L470 AbstractCegarLoop]: Abstraction has 26026 states and 34175 transitions. [2021-11-23 17:19:14,843 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:14,843 INFO L276 IsEmpty]: Start isEmpty. Operand 26026 states and 34175 transitions. [2021-11-23 17:19:14,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:19:14,847 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:14,847 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:19:14,859 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:15,048 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:19:15,048 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:15,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:15,049 INFO L85 PathProgramCache]: Analyzing trace with hash -1535387637, now seen corresponding path program 1 times [2021-11-23 17:19:15,049 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:15,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1487381192] [2021-11-23 17:19:15,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:15,049 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:15,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:15,050 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:15,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-23 17:19:15,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:15,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:19:15,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:15,994 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:15,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:16,567 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:16,568 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:16,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1487381192] [2021-11-23 17:19:16,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1487381192] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:16,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2107438210] [2021-11-23 17:19:16,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:16,568 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:16,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:16,569 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:16,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (47)] Waiting until timeout for monitored process [2021-11-23 17:19:16,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:16,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:19:16,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:17,445 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:17,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:17,999 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:17,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2107438210] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:17,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [111925034] [2021-11-23 17:19:18,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:18,000 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:18,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:19:18,001 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:19:18,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-23 17:19:18,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:18,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:19:18,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:18,852 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:18,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:19,387 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:19,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [111925034] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:19,388 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:19:19,388 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:19:19,388 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322873888] [2021-11-23 17:19:19,389 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:19:19,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:19:19,390 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:19,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:19:19,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:19:19,391 INFO L87 Difference]: Start difference. First operand 26026 states and 34175 transitions. Second operand has 16 states, 16 states have (on average 9.25) internal successors, (148), 15 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:21,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:21,756 INFO L93 Difference]: Finished difference Result 35904 states and 46776 transitions. [2021-11-23 17:19:21,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:19:21,757 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.25) internal successors, (148), 15 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-23 17:19:21,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:21,814 INFO L225 Difference]: With dead ends: 35904 [2021-11-23 17:19:21,815 INFO L226 Difference]: Without dead ends: 33864 [2021-11-23 17:19:21,823 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 508 GetRequests, 490 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:19:21,824 INFO L933 BasicCegarLoop]: 155 mSDtfsCounter, 149 mSDsluCounter, 1105 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 1260 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 95 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:21,825 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 1260 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 195 Invalid, 0 Unknown, 95 Unchecked, 0.2s Time] [2021-11-23 17:19:21,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33864 states. [2021-11-23 17:19:23,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33864 to 26040. [2021-11-23 17:19:23,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26040 states, 26039 states have (on average 1.3129920503859596) internal successors, (34189), 26039 states have internal predecessors, (34189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:23,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26040 states to 26040 states and 34189 transitions. [2021-11-23 17:19:23,796 INFO L78 Accepts]: Start accepts. Automaton has 26040 states and 34189 transitions. Word has length 85 [2021-11-23 17:19:23,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:23,797 INFO L470 AbstractCegarLoop]: Abstraction has 26040 states and 34189 transitions. [2021-11-23 17:19:23,797 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.25) internal successors, (148), 15 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:23,797 INFO L276 IsEmpty]: Start isEmpty. Operand 26040 states and 34189 transitions. [2021-11-23 17:19:23,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:19:23,801 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:23,802 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:19:23,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (47)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:24,027 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2021-11-23 17:19:24,211 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:24,404 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:19:24,404 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:24,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:24,404 INFO L85 PathProgramCache]: Analyzing trace with hash -875856115, now seen corresponding path program 1 times [2021-11-23 17:19:24,405 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:24,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1959152592] [2021-11-23 17:19:24,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:24,405 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:24,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:24,406 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:24,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2021-11-23 17:19:24,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:24,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:19:24,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:24,911 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:19:24,911 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:19:24,911 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:24,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1959152592] [2021-11-23 17:19:24,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1959152592] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:19:24,912 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:19:24,912 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:19:24,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356803460] [2021-11-23 17:19:24,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:19:24,913 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:19:24,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:24,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:19:24,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:19:24,914 INFO L87 Difference]: Start difference. First operand 26040 states and 34189 transitions. Second operand has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 5 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:26,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:26,257 INFO L93 Difference]: Finished difference Result 28081 states and 36801 transitions. [2021-11-23 17:19:26,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:19:26,257 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 5 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-23 17:19:26,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:26,290 INFO L225 Difference]: With dead ends: 28081 [2021-11-23 17:19:26,290 INFO L226 Difference]: Without dead ends: 26026 [2021-11-23 17:19:26,298 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:19:26,299 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 45 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 376 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 46 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:26,299 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 376 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 42 Invalid, 0 Unknown, 46 Unchecked, 0.0s Time] [2021-11-23 17:19:26,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26026 states. [2021-11-23 17:19:27,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26026 to 26026. [2021-11-23 17:19:27,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26026 states, 26025 states have (on average 1.3130835734870316) internal successors, (34173), 26025 states have internal predecessors, (34173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:27,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26026 states to 26026 states and 34173 transitions. [2021-11-23 17:19:27,991 INFO L78 Accepts]: Start accepts. Automaton has 26026 states and 34173 transitions. Word has length 85 [2021-11-23 17:19:27,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:27,991 INFO L470 AbstractCegarLoop]: Abstraction has 26026 states and 34173 transitions. [2021-11-23 17:19:27,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 5 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:27,991 INFO L276 IsEmpty]: Start isEmpty. Operand 26026 states and 34173 transitions. [2021-11-23 17:19:27,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:19:27,996 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:27,996 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:19:28,004 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (49)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:28,196 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:19:28,197 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:28,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:28,197 INFO L85 PathProgramCache]: Analyzing trace with hash 71261356, now seen corresponding path program 1 times [2021-11-23 17:19:28,197 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:28,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1784980650] [2021-11-23 17:19:28,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:28,198 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:28,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:28,199 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:28,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-23 17:19:28,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:28,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:19:28,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:28,562 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:28,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:28,720 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:28,720 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:28,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1784980650] [2021-11-23 17:19:28,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1784980650] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:28,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [795962647] [2021-11-23 17:19:28,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:28,721 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:28,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:28,722 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:28,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process [2021-11-23 17:19:28,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:28,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:19:28,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:29,119 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:29,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:29,272 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:29,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [795962647] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:29,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [68931402] [2021-11-23 17:19:29,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:29,272 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:29,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:19:29,274 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:19:29,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-23 17:19:29,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:29,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:19:29,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:29,719 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:29,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:30,128 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:30,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [68931402] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:30,128 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:19:30,128 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 6, 6] total 18 [2021-11-23 17:19:30,129 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510711488] [2021-11-23 17:19:30,129 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:19:30,129 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:19:30,130 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:30,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:19:30,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:19:30,131 INFO L87 Difference]: Start difference. First operand 26026 states and 34173 transitions. Second operand has 18 states, 18 states have (on average 16.666666666666668) internal successors, (300), 18 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:33,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:33,337 INFO L93 Difference]: Finished difference Result 62325 states and 81325 transitions. [2021-11-23 17:19:33,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:19:33,337 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 16.666666666666668) internal successors, (300), 18 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-23 17:19:33,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:33,385 INFO L225 Difference]: With dead ends: 62325 [2021-11-23 17:19:33,386 INFO L226 Difference]: Without dead ends: 41394 [2021-11-23 17:19:33,397 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 511 GetRequests, 488 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2021-11-23 17:19:33,398 INFO L933 BasicCegarLoop]: 136 mSDtfsCounter, 1308 mSDsluCounter, 589 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1308 SdHoareTripleChecker+Valid, 725 SdHoareTripleChecker+Invalid, 398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:33,398 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1308 Valid, 725 Invalid, 398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 17:19:33,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41394 states. [2021-11-23 17:19:35,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41394 to 30758. [2021-11-23 17:19:35,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30758 states, 30757 states have (on average 1.3033780927918848) internal successors, (40088), 30757 states have internal predecessors, (40088), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:35,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30758 states to 30758 states and 40088 transitions. [2021-11-23 17:19:35,971 INFO L78 Accepts]: Start accepts. Automaton has 30758 states and 40088 transitions. Word has length 85 [2021-11-23 17:19:35,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:35,971 INFO L470 AbstractCegarLoop]: Abstraction has 30758 states and 40088 transitions. [2021-11-23 17:19:35,971 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 16.666666666666668) internal successors, (300), 18 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:35,972 INFO L276 IsEmpty]: Start isEmpty. Operand 30758 states and 40088 transitions. [2021-11-23 17:19:35,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:19:35,978 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:35,979 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:19:36,004 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2021-11-23 17:19:36,188 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (50)] Ended with exit code 0 [2021-11-23 17:19:36,382 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (51)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:36,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:36,581 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:36,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:36,581 INFO L85 PathProgramCache]: Analyzing trace with hash 2038661295, now seen corresponding path program 1 times [2021-11-23 17:19:36,582 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:36,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [669844933] [2021-11-23 17:19:36,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:36,582 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:36,583 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:36,583 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:36,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (53)] Waiting until timeout for monitored process [2021-11-23 17:19:36,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:36,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:19:36,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:37,877 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:37,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:38,398 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:38,399 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:38,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [669844933] [2021-11-23 17:19:38,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [669844933] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:38,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1984019322] [2021-11-23 17:19:38,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:38,399 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:38,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:38,400 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:38,402 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (54)] Waiting until timeout for monitored process [2021-11-23 17:19:38,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:38,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:19:38,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:39,715 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:39,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:40,113 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:40,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1984019322] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:40,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [646164881] [2021-11-23 17:19:40,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:40,113 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:40,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:19:40,114 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:19:40,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-23 17:19:40,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:40,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:19:40,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:41,343 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:41,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:41,835 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:41,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [646164881] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:41,835 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:19:41,836 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:19:41,836 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238763361] [2021-11-23 17:19:41,836 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:19:41,837 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:19:41,837 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:41,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:19:41,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:19:41,838 INFO L87 Difference]: Start difference. First operand 30758 states and 40088 transitions. Second operand has 16 states, 16 states have (on average 10.1875) internal successors, (163), 15 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:44,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:44,292 INFO L93 Difference]: Finished difference Result 35110 states and 45305 transitions. [2021-11-23 17:19:44,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 17:19:44,293 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.1875) internal successors, (163), 15 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-23 17:19:44,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:44,331 INFO L225 Difference]: With dead ends: 35110 [2021-11-23 17:19:44,332 INFO L226 Difference]: Without dead ends: 33259 [2021-11-23 17:19:44,338 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 508 GetRequests, 490 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:19:44,339 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 159 mSDsluCounter, 1058 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 1191 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 127 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:44,340 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 1191 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 105 Invalid, 0 Unknown, 127 Unchecked, 0.1s Time] [2021-11-23 17:19:44,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33259 states. [2021-11-23 17:19:46,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33259 to 30806. [2021-11-23 17:19:46,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30806 states, 30805 states have (on average 1.3033923064437591) internal successors, (40151), 30805 states have internal predecessors, (40151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:46,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30806 states to 30806 states and 40151 transitions. [2021-11-23 17:19:46,616 INFO L78 Accepts]: Start accepts. Automaton has 30806 states and 40151 transitions. Word has length 85 [2021-11-23 17:19:46,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:46,616 INFO L470 AbstractCegarLoop]: Abstraction has 30806 states and 40151 transitions. [2021-11-23 17:19:46,617 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.1875) internal successors, (163), 15 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:46,617 INFO L276 IsEmpty]: Start isEmpty. Operand 30806 states and 40151 transitions. [2021-11-23 17:19:46,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:19:46,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:46,623 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:19:46,632 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (53)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:46,848 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2021-11-23 17:19:47,025 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (54)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:47,224 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:47,224 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:47,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:47,225 INFO L85 PathProgramCache]: Analyzing trace with hash -2008159507, now seen corresponding path program 1 times [2021-11-23 17:19:47,225 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:47,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1862768662] [2021-11-23 17:19:47,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:47,227 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:47,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:47,228 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:47,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-23 17:19:47,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:47,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:19:47,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:47,761 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:19:47,762 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:19:47,762 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:47,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1862768662] [2021-11-23 17:19:47,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1862768662] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:19:47,762 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:19:47,762 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:19:47,762 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082307659] [2021-11-23 17:19:47,762 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:19:47,763 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:19:47,763 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:47,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:19:47,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:19:47,764 INFO L87 Difference]: Start difference. First operand 30806 states and 40151 transitions. Second operand has 6 states, 6 states have (on average 13.5) internal successors, (81), 5 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:49,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:49,696 INFO L93 Difference]: Finished difference Result 35146 states and 45634 transitions. [2021-11-23 17:19:49,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:19:49,697 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.5) internal successors, (81), 5 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-23 17:19:49,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:49,737 INFO L225 Difference]: With dead ends: 35146 [2021-11-23 17:19:49,738 INFO L226 Difference]: Without dead ends: 30806 [2021-11-23 17:19:49,747 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:19:49,748 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 49 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 295 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:49,749 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 295 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 50 Invalid, 0 Unknown, 18 Unchecked, 0.0s Time] [2021-11-23 17:19:49,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30806 states. [2021-11-23 17:19:52,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30806 to 30806. [2021-11-23 17:19:52,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30806 states, 30805 states have (on average 1.3033598441811394) internal successors, (40150), 30805 states have internal predecessors, (40150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:52,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30806 states to 30806 states and 40150 transitions. [2021-11-23 17:19:52,177 INFO L78 Accepts]: Start accepts. Automaton has 30806 states and 40150 transitions. Word has length 85 [2021-11-23 17:19:52,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:52,177 INFO L470 AbstractCegarLoop]: Abstraction has 30806 states and 40150 transitions. [2021-11-23 17:19:52,177 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.5) internal successors, (81), 5 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:52,177 INFO L276 IsEmpty]: Start isEmpty. Operand 30806 states and 40150 transitions. [2021-11-23 17:19:52,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:19:52,183 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:52,183 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:19:52,192 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Ended with exit code 0 [2021-11-23 17:19:52,384 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:19:52,384 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:52,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:52,384 INFO L85 PathProgramCache]: Analyzing trace with hash 1181693530, now seen corresponding path program 1 times [2021-11-23 17:19:52,385 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:52,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2041497100] [2021-11-23 17:19:52,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:52,385 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:52,385 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:52,386 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:52,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 17:19:52,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:52,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:19:52,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:52,806 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:19:52,806 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:19:52,806 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:52,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2041497100] [2021-11-23 17:19:52,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2041497100] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:19:52,807 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:19:52,807 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:19:52,807 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854403933] [2021-11-23 17:19:52,807 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:19:52,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:19:52,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:52,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:19:52,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:19:52,808 INFO L87 Difference]: Start difference. First operand 30806 states and 40150 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 5 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:55,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:55,222 INFO L93 Difference]: Finished difference Result 61148 states and 79757 transitions. [2021-11-23 17:19:55,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:19:55,222 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 5 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-23 17:19:55,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:55,262 INFO L225 Difference]: With dead ends: 61148 [2021-11-23 17:19:55,262 INFO L226 Difference]: Without dead ends: 30806 [2021-11-23 17:19:55,278 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:19:55,279 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 44 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:55,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 309 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 43 Unchecked, 0.0s Time] [2021-11-23 17:19:55,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30806 states. [2021-11-23 17:19:57,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30806 to 30806. [2021-11-23 17:19:57,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30806 states, 30805 states have (on average 1.3033273819185198) internal successors, (40149), 30805 states have internal predecessors, (40149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:57,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30806 states to 30806 states and 40149 transitions. [2021-11-23 17:19:57,810 INFO L78 Accepts]: Start accepts. Automaton has 30806 states and 40149 transitions. Word has length 85 [2021-11-23 17:19:57,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:57,810 INFO L470 AbstractCegarLoop]: Abstraction has 30806 states and 40149 transitions. [2021-11-23 17:19:57,810 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 5 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:57,810 INFO L276 IsEmpty]: Start isEmpty. Operand 30806 states and 40149 transitions. [2021-11-23 17:19:57,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:19:57,817 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:57,817 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:19:57,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:58,019 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:19:58,019 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:58,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:58,020 INFO L85 PathProgramCache]: Analyzing trace with hash -356646500, now seen corresponding path program 1 times [2021-11-23 17:19:58,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:58,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1307776185] [2021-11-23 17:19:58,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:58,021 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:58,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:58,022 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:58,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (58)] Waiting until timeout for monitored process [2021-11-23 17:19:58,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:58,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:19:58,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:58,379 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:58,379 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:58,711 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:58,711 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:58,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1307776185] [2021-11-23 17:19:58,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1307776185] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:58,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [328097970] [2021-11-23 17:19:58,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:58,712 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:58,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:58,712 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:58,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (59)] Waiting until timeout for monitored process [2021-11-23 17:19:58,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:58,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:19:58,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:59,082 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:59,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:59,233 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:59,234 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [328097970] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:59,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470375523] [2021-11-23 17:19:59,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:59,234 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:59,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:19:59,235 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:19:59,236 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e77f3c0e-d1fa-4f2d-a06f-1ef278cf4c24/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-23 17:19:59,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:59,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:19:59,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:59,681 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:59,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:59,944 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:59,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470375523] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:59,944 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:19:59,944 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 6, 6] total 18 [2021-11-23 17:19:59,945 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698348218] [2021-11-23 17:19:59,945 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:19:59,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:19:59,945 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:59,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:19:59,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:19:59,946 INFO L87 Difference]: Start difference. First operand 30806 states and 40149 transitions. Second operand has 18 states, 18 states have (on average 15.333333333333334) internal successors, (276), 18 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)