./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label02.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_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/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_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label02.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/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_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/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 d7b7824f74ab8cbbea36fdaee1d1dc5c7e52c10bcc21a0858c24d31348bf95ad --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:14:01,700 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:14:01,704 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:14:01,767 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:14:01,768 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:14:01,773 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:14:01,775 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:14:01,780 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:14:01,783 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:14:01,788 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:14:01,790 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:14:01,792 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:14:01,792 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:14:01,795 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:14:01,798 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:14:01,803 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:14:01,805 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:14:01,806 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:14:01,808 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:14:01,817 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:14:01,819 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:14:01,821 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:14:01,824 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:14:01,825 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:14:01,836 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:14:01,837 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:14:01,837 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:14:01,840 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:14:01,840 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:14:01,842 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:14:01,843 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:14:01,844 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:14:01,854 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:14:01,855 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:14:01,857 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:14:01,858 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:14:01,859 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:14:01,859 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:14:01,859 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:14:01,860 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:14:01,861 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:14:01,865 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:14:01,926 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:14:01,926 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:14:01,927 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:14:01,928 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:14:01,929 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:14:01,929 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:14:01,929 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:14:01,929 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:14:01,929 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:14:01,930 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:14:01,931 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:14:01,931 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:14:01,931 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:14:01,931 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:14:01,932 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:14:01,932 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:14:01,932 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:14:01,933 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:14:01,933 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:14:01,934 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:14:01,934 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:14:01,934 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:14:01,934 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:14:01,934 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:14:01,935 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:14:01,935 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:14:01,936 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:14:01,937 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:14:01,937 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:14:01,937 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:14:01,938 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:14:01,938 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:14:01,938 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:14:01,939 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:14:01,939 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:14:01,939 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:14:01,939 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:14:01,939 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:14:01,940 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:14:01,940 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:14:01,940 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:14:01,940 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_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d7b7824f74ab8cbbea36fdaee1d1dc5c7e52c10bcc21a0858c24d31348bf95ad [2021-11-23 17:14:02,265 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:14:02,287 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:14:02,290 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:14:02,291 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:14:02,292 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:14:02,294 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label02.c [2021-11-23 17:14:02,357 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/data/72d2bde6b/74a75e9a41dd418dbdf82bead3ba4c76/FLAG78919209e [2021-11-23 17:14:03,289 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:14:03,290 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label02.c [2021-11-23 17:14:03,344 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/data/72d2bde6b/74a75e9a41dd418dbdf82bead3ba4c76/FLAG78919209e [2021-11-23 17:14:03,826 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/data/72d2bde6b/74a75e9a41dd418dbdf82bead3ba4c76 [2021-11-23 17:14:03,828 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:14:03,831 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:14:03,835 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:14:03,835 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:14:03,839 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:14:03,840 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:14:03" (1/1) ... [2021-11-23 17:14:03,841 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4df4d927 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:03, skipping insertion in model container [2021-11-23 17:14:03,842 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:14:03" (1/1) ... [2021-11-23 17:14:03,849 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:14:04,100 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:14:04,416 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_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label02.c[6354,6367] [2021-11-23 17:14:04,491 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_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label02.c[13644,13657] [2021-11-23 17:14:05,579 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:14:05,589 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:14:05,648 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_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label02.c[6354,6367] [2021-11-23 17:14:05,661 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_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label02.c[13644,13657] [2021-11-23 17:14:06,264 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:14:06,301 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:14:06,302 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:06 WrapperNode [2021-11-23 17:14:06,302 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:14:06,304 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:14:06,304 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:14:06,304 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:14:06,338 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:06" (1/1) ... [2021-11-23 17:14:06,418 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:06" (1/1) ... [2021-11-23 17:14:06,870 INFO L137 Inliner]: procedures = 33, calls = 19, calls flagged for inlining = 14, calls inlined = 14, statements flattened = 4976 [2021-11-23 17:14:06,870 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:14:06,871 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:14:06,872 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:14:06,872 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:14:06,882 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:06" (1/1) ... [2021-11-23 17:14:06,883 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:06" (1/1) ... [2021-11-23 17:14:06,952 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:06" (1/1) ... [2021-11-23 17:14:06,952 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:06" (1/1) ... [2021-11-23 17:14:07,216 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:06" (1/1) ... [2021-11-23 17:14:07,273 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:06" (1/1) ... [2021-11-23 17:14:07,305 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:06" (1/1) ... [2021-11-23 17:14:07,429 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:14:07,439 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:14:07,439 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:14:07,440 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:14:07,457 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:06" (1/1) ... [2021-11-23 17:14:07,465 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:14:07,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:14:07,538 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:14:07,569 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:14:07,593 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:14:07,593 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:14:07,594 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:14:07,594 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:14:07,785 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:14:07,799 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:14:12,817 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:14:12,906 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 17:14:12,918 INFO L158 Benchmark]: Toolchain (without parser) took 9084.70ms. Allocated memory was 98.6MB in the beginning and 574.6MB in the end (delta: 476.1MB). Free memory was 57.0MB in the beginning and 379.8MB in the end (delta: -322.8MB). Peak memory consumption was 217.5MB. Max. memory is 16.1GB. [2021-11-23 17:14:12,919 INFO L158 Benchmark]: CDTParser took 0.32ms. Allocated memory is still 98.6MB. Free memory was 69.2MB in the beginning and 69.1MB in the end (delta: 47.6kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:14:12,921 INFO L158 Benchmark]: CACSL2BoogieTranslator took 2467.71ms. Allocated memory was 98.6MB in the beginning and 123.7MB in the end (delta: 25.2MB). Free memory was 56.7MB in the beginning and 40.8MB in the end (delta: 15.9MB). Peak memory consumption was 47.1MB. Max. memory is 16.1GB. [2021-11-23 17:14:12,923 INFO L158 Benchmark]: Boogie Procedure Inliner took 566.90ms. Allocated memory was 123.7MB in the beginning and 195.0MB in the end (delta: 71.3MB). Free memory was 40.8MB in the beginning and 97.8MB in the end (delta: -57.0MB). Peak memory consumption was 56.1MB. Max. memory is 16.1GB. [2021-11-23 17:14:12,924 INFO L158 Benchmark]: Boogie Preprocessor took 566.46ms. Allocated memory is still 195.0MB. Free memory was 97.8MB in the beginning and 79.5MB in the end (delta: 18.3MB). Peak memory consumption was 53.5MB. Max. memory is 16.1GB. [2021-11-23 17:14:12,926 INFO L158 Benchmark]: RCFGBuilder took 5475.23ms. Allocated memory was 195.0MB in the beginning and 574.6MB in the end (delta: 379.6MB). Free memory was 79.5MB in the beginning and 379.8MB in the end (delta: -300.2MB). Peak memory consumption was 140.5MB. Max. memory is 16.1GB. [2021-11-23 17:14:12,937 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32ms. Allocated memory is still 98.6MB. Free memory was 69.2MB in the beginning and 69.1MB in the end (delta: 47.6kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 2467.71ms. Allocated memory was 98.6MB in the beginning and 123.7MB in the end (delta: 25.2MB). Free memory was 56.7MB in the beginning and 40.8MB in the end (delta: 15.9MB). Peak memory consumption was 47.1MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 566.90ms. Allocated memory was 123.7MB in the beginning and 195.0MB in the end (delta: 71.3MB). Free memory was 40.8MB in the beginning and 97.8MB in the end (delta: -57.0MB). Peak memory consumption was 56.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 566.46ms. Allocated memory is still 195.0MB. Free memory was 97.8MB in the beginning and 79.5MB in the end (delta: 18.3MB). Peak memory consumption was 53.5MB. Max. memory is 16.1GB. * RCFGBuilder took 5475.23ms. Allocated memory was 195.0MB in the beginning and 574.6MB in the end (delta: 379.6MB). Free memory was 79.5MB in the beginning and 379.8MB in the end (delta: -300.2MB). Peak memory consumption was 140.5MB. 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 17:14:12,985 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/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_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/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_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label02.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/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_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/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 d7b7824f74ab8cbbea36fdaee1d1dc5c7e52c10bcc21a0858c24d31348bf95ad --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:14:15,627 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:14:15,631 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:14:15,697 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:14:15,698 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:14:15,702 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:14:15,705 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:14:15,710 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:14:15,714 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:14:15,722 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:14:15,724 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:14:15,727 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:14:15,727 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:14:15,730 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:14:15,733 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:14:15,738 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:14:15,740 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:14:15,741 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:14:15,744 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:14:15,753 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:14:15,755 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:14:15,757 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:14:15,760 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:14:15,762 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:14:15,772 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:14:15,773 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:14:15,773 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:14:15,775 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:14:15,776 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:14:15,778 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:14:15,779 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:14:15,788 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:14:15,790 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:14:15,791 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:14:15,793 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:14:15,794 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:14:15,795 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:14:15,796 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:14:15,796 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:14:15,798 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:14:15,799 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:14:15,806 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:14:15,860 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:14:15,860 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:14:15,861 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:14:15,862 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:14:15,863 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:14:15,863 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:14:15,864 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:14:15,864 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:14:15,865 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:14:15,865 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:14:15,866 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:14:15,867 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:14:15,869 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:14:15,869 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:14:15,870 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:14:15,870 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:14:15,870 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:14:15,871 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:14:15,871 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:14:15,871 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:14:15,872 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:14:15,872 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:14:15,872 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:14:15,873 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:14:15,873 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:14:15,873 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:14:15,874 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:14:15,874 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:14:15,874 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:14:15,875 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:14:15,875 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:14:15,875 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:14:15,876 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:14:15,877 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:14:15,877 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:14:15,878 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:14:15,878 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:14:15,879 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:14:15,879 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_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d7b7824f74ab8cbbea36fdaee1d1dc5c7e52c10bcc21a0858c24d31348bf95ad [2021-11-23 17:14:16,364 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:14:16,398 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:14:16,402 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:14:16,403 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:14:16,406 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:14:16,407 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label02.c [2021-11-23 17:14:16,490 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/data/3bd7df2a8/7d4be3b349db466083402b0af52b5673/FLAGcc5e1ec9e [2021-11-23 17:14:17,500 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:14:17,502 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label02.c [2021-11-23 17:14:17,547 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/data/3bd7df2a8/7d4be3b349db466083402b0af52b5673/FLAGcc5e1ec9e [2021-11-23 17:14:17,916 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/data/3bd7df2a8/7d4be3b349db466083402b0af52b5673 [2021-11-23 17:14:17,919 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:14:17,921 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:14:17,923 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:14:17,923 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:14:17,928 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:14:17,930 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:14:17" (1/1) ... [2021-11-23 17:14:17,931 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c5e4e16 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:17, skipping insertion in model container [2021-11-23 17:14:17,932 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:14:17" (1/1) ... [2021-11-23 17:14:17,940 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:14:18,130 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:14:18,650 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_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label02.c[6354,6367] [2021-11-23 17:14:18,782 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_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label02.c[13644,13657] [2021-11-23 17:14:19,955 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:14:19,971 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:14:20,027 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_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label02.c[6354,6367] [2021-11-23 17:14:20,047 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_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label02.c[13644,13657] [2021-11-23 17:14:20,935 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:14:20,980 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:14:20,980 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:20 WrapperNode [2021-11-23 17:14:20,980 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:14:20,982 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:14:20,982 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:14:20,982 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:14:20,991 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:20" (1/1) ... [2021-11-23 17:14:21,097 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:20" (1/1) ... [2021-11-23 17:14:21,357 INFO L137 Inliner]: procedures = 34, calls = 19, calls flagged for inlining = 14, calls inlined = 14, statements flattened = 4957 [2021-11-23 17:14:21,358 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:14:21,360 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:14:21,360 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:14:21,361 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:14:21,371 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:20" (1/1) ... [2021-11-23 17:14:21,372 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:20" (1/1) ... [2021-11-23 17:14:21,435 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:20" (1/1) ... [2021-11-23 17:14:21,436 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:20" (1/1) ... [2021-11-23 17:14:21,695 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:20" (1/1) ... [2021-11-23 17:14:21,743 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:20" (1/1) ... [2021-11-23 17:14:21,763 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:20" (1/1) ... [2021-11-23 17:14:21,812 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:14:21,814 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:14:21,814 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:14:21,814 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:14:21,815 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:20" (1/1) ... [2021-11-23 17:14:21,824 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:14:21,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:14:21,881 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:14:21,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:14:22,067 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:14:22,068 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:14:22,068 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:14:22,069 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:14:22,219 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:14:22,234 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:14:52,827 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:14:52,854 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:14:52,854 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 17:14:52,858 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:14:52 BoogieIcfgContainer [2021-11-23 17:14:52,858 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:14:52,860 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:14:52,861 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:14:52,864 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:14:52,864 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:14:17" (1/3) ... [2021-11-23 17:14:52,865 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74f39153 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:14:52, skipping insertion in model container [2021-11-23 17:14:52,865 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:20" (2/3) ... [2021-11-23 17:14:52,866 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74f39153 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:14:52, skipping insertion in model container [2021-11-23 17:14:52,866 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:14:52" (3/3) ... [2021-11-23 17:14:52,867 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label02.c [2021-11-23 17:14:52,873 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:14:52,874 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 17:14:52,934 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:14:52,943 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 17:14:52,943 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 17:14:52,983 INFO L276 IsEmpty]: Start isEmpty. Operand has 878 states, 875 states have (on average 1.904) internal successors, (1666), 877 states have internal predecessors, (1666), 0 states have call successors, (0), 0 states 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 17:14:52,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 17:14:52,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:52,993 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] [2021-11-23 17:14:52,994 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:53,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:53,001 INFO L85 PathProgramCache]: Analyzing trace with hash 975463267, now seen corresponding path program 1 times [2021-11-23 17:14:53,015 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:53,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [183714738] [2021-11-23 17:14:53,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:53,017 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:53,018 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:53,020 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:53,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:14:53,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:53,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 17:14:53,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:53,274 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 17:14:53,274 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:14:53,275 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:53,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [183714738] [2021-11-23 17:14:53,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [183714738] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:14:53,276 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:14:53,277 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:14:53,279 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100189159] [2021-11-23 17:14:53,279 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:14:53,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 17:14:53,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:53,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 17:14:53,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:14:53,351 INFO L87 Difference]: Start difference. First operand has 878 states, 875 states have (on average 1.904) internal successors, (1666), 877 states have internal predecessors, (1666), 0 states have call successors, (0), 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 13.0) internal successors, (26), 2 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:53,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:53,499 INFO L93 Difference]: Finished difference Result 1734 states and 3292 transitions. [2021-11-23 17:14:53,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 17:14:53,502 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-23 17:14:53,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:53,538 INFO L225 Difference]: With dead ends: 1734 [2021-11-23 17:14:53,538 INFO L226 Difference]: Without dead ends: 812 [2021-11-23 17:14:53,547 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 25 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 17:14:53,551 INFO L933 BasicCegarLoop]: 1600 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, 1600 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 17:14:53,552 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 1600 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:14:53,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 812 states. [2021-11-23 17:14:53,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 812 to 812. [2021-11-23 17:14:53,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 812 states, 810 states have (on average 1.8925925925925926) internal successors, (1533), 811 states have internal predecessors, (1533), 0 states have call successors, (0), 0 states 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 17:14:53,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 812 states to 812 states and 1533 transitions. [2021-11-23 17:14:53,650 INFO L78 Accepts]: Start accepts. Automaton has 812 states and 1533 transitions. Word has length 26 [2021-11-23 17:14:53,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:53,651 INFO L470 AbstractCegarLoop]: Abstraction has 812 states and 1533 transitions. [2021-11-23 17:14:53,651 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:53,651 INFO L276 IsEmpty]: Start isEmpty. Operand 812 states and 1533 transitions. [2021-11-23 17:14:53,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 17:14:53,653 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:53,653 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] [2021-11-23 17:14:53,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:53,866 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:14:53,867 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:53,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:53,868 INFO L85 PathProgramCache]: Analyzing trace with hash 157814817, now seen corresponding path program 1 times [2021-11-23 17:14:53,869 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:53,870 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [83125353] [2021-11-23 17:14:53,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:53,870 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:53,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:53,872 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:53,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:14:53,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:53,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:14:53,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:54,089 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 17:14:54,089 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:14:54,090 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:54,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [83125353] [2021-11-23 17:14:54,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [83125353] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:14:54,090 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:14:54,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:14:54,091 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798253737] [2021-11-23 17:14:54,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:14:54,092 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:14:54,092 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:54,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:14:54,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:14:54,093 INFO L87 Difference]: Start difference. First operand 812 states and 1533 transitions. Second operand has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:54,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:54,417 INFO L93 Difference]: Finished difference Result 888 states and 1649 transitions. [2021-11-23 17:14:54,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:14:54,417 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-23 17:14:54,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:54,426 INFO L225 Difference]: With dead ends: 888 [2021-11-23 17:14:54,430 INFO L226 Difference]: Without dead ends: 848 [2021-11-23 17:14:54,431 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:14:54,441 INFO L933 BasicCegarLoop]: 1529 mSDtfsCounter, 58 mSDsluCounter, 4566 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 6095 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:14:54,442 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 6095 Invalid, 36 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [16 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:14:54,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 848 states. [2021-11-23 17:14:54,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 848 to 812. [2021-11-23 17:14:54,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 812 states, 810 states have (on average 1.8728395061728396) internal successors, (1517), 811 states have internal predecessors, (1517), 0 states have call successors, (0), 0 states 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 17:14:54,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 812 states to 812 states and 1517 transitions. [2021-11-23 17:14:54,504 INFO L78 Accepts]: Start accepts. Automaton has 812 states and 1517 transitions. Word has length 26 [2021-11-23 17:14:54,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:54,505 INFO L470 AbstractCegarLoop]: Abstraction has 812 states and 1517 transitions. [2021-11-23 17:14:54,505 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:54,505 INFO L276 IsEmpty]: Start isEmpty. Operand 812 states and 1517 transitions. [2021-11-23 17:14:54,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 17:14:54,514 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:54,514 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] [2021-11-23 17:14:54,533 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:54,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:14:54,729 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:54,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:54,730 INFO L85 PathProgramCache]: Analyzing trace with hash -1324654887, now seen corresponding path program 1 times [2021-11-23 17:14:54,731 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:54,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1405679513] [2021-11-23 17:14:54,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:54,732 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:54,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:54,733 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:54,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:14:54,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:54,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:14:54,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:54,982 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 17:14:54,983 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:14:54,984 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:54,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1405679513] [2021-11-23 17:14:54,985 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1405679513] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:14:54,985 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:14:54,985 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:14:54,986 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870112474] [2021-11-23 17:14:54,986 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:14:54,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:14:54,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:54,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:14:54,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:14:54,988 INFO L87 Difference]: Start difference. First operand 812 states and 1517 transitions. Second operand has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:55,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:55,040 INFO L93 Difference]: Finished difference Result 878 states and 1619 transitions. [2021-11-23 17:14:55,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:14:55,041 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-23 17:14:55,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:55,048 INFO L225 Difference]: With dead ends: 878 [2021-11-23 17:14:55,048 INFO L226 Difference]: Without dead ends: 842 [2021-11-23 17:14:55,049 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 39 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 17:14:55,051 INFO L933 BasicCegarLoop]: 1559 mSDtfsCounter, 1485 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1485 SdHoareTripleChecker+Valid, 1613 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 17:14:55,052 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1485 Valid, 1613 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:14:55,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 842 states. [2021-11-23 17:14:55,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 842 to 840. [2021-11-23 17:14:55,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 840 states, 838 states have (on average 1.8627684964200477) internal successors, (1561), 839 states have internal predecessors, (1561), 0 states have call successors, (0), 0 states 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 17:14:55,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 840 states to 840 states and 1561 transitions. [2021-11-23 17:14:55,086 INFO L78 Accepts]: Start accepts. Automaton has 840 states and 1561 transitions. Word has length 41 [2021-11-23 17:14:55,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:55,087 INFO L470 AbstractCegarLoop]: Abstraction has 840 states and 1561 transitions. [2021-11-23 17:14:55,087 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:55,088 INFO L276 IsEmpty]: Start isEmpty. Operand 840 states and 1561 transitions. [2021-11-23 17:14:55,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 17:14:55,089 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:55,090 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] [2021-11-23 17:14:55,108 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:55,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:14:55,308 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:55,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:55,309 INFO L85 PathProgramCache]: Analyzing trace with hash 1376027727, now seen corresponding path program 1 times [2021-11-23 17:14:55,310 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:55,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [6850237] [2021-11-23 17:14:55,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:55,310 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:55,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:55,311 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:55,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:14:55,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:55,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:14:55,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:55,936 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 17:14:55,938 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:14:55,938 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:55,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [6850237] [2021-11-23 17:14:55,939 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [6850237] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:14:55,945 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:14:55,945 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:14:55,946 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708835536] [2021-11-23 17:14:55,946 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:14:55,946 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:14:55,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:55,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:14:55,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:14:55,951 INFO L87 Difference]: Start difference. First operand 840 states and 1561 transitions. Second operand has 5 states, 5 states have (on average 8.2) internal successors, (41), 5 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:56,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:56,144 INFO L93 Difference]: Finished difference Result 1096 states and 1961 transitions. [2021-11-23 17:14:56,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:14:56,145 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.2) internal successors, (41), 5 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-23 17:14:56,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:56,153 INFO L225 Difference]: With dead ends: 1096 [2021-11-23 17:14:56,154 INFO L226 Difference]: Without dead ends: 1032 [2021-11-23 17:14:56,155 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:14:56,156 INFO L933 BasicCegarLoop]: 1511 mSDtfsCounter, 1678 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1678 SdHoareTripleChecker+Valid, 1680 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:14:56,157 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1678 Valid, 1680 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:14:56,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1032 states. [2021-11-23 17:14:56,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1032 to 964. [2021-11-23 17:14:56,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 964 states, 962 states have (on average 1.8222453222453223) internal successors, (1753), 963 states have internal predecessors, (1753), 0 states have call successors, (0), 0 states 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 17:14:56,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 964 states to 964 states and 1753 transitions. [2021-11-23 17:14:56,196 INFO L78 Accepts]: Start accepts. Automaton has 964 states and 1753 transitions. Word has length 41 [2021-11-23 17:14:56,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:56,197 INFO L470 AbstractCegarLoop]: Abstraction has 964 states and 1753 transitions. [2021-11-23 17:14:56,197 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.2) internal successors, (41), 5 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:56,198 INFO L276 IsEmpty]: Start isEmpty. Operand 964 states and 1753 transitions. [2021-11-23 17:14:56,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 17:14:56,199 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:56,200 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] [2021-11-23 17:14:56,216 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:56,413 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:14:56,413 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:56,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:56,415 INFO L85 PathProgramCache]: Analyzing trace with hash -1902982177, now seen corresponding path program 1 times [2021-11-23 17:14:56,416 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:56,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [614959812] [2021-11-23 17:14:56,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:56,421 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:56,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:56,422 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:56,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:14:56,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:56,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:14:56,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:56,714 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 17:14:56,714 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:14:56,714 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:56,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [614959812] [2021-11-23 17:14:56,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [614959812] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:14:56,715 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:14:56,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:14:56,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234612311] [2021-11-23 17:14:56,715 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:14:56,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:14:56,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:56,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:14:56,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:14:56,717 INFO L87 Difference]: Start difference. First operand 964 states and 1753 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:56,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:56,785 INFO L93 Difference]: Finished difference Result 1242 states and 2182 transitions. [2021-11-23 17:14:56,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:14:56,786 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-23 17:14:56,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:56,794 INFO L225 Difference]: With dead ends: 1242 [2021-11-23 17:14:56,794 INFO L226 Difference]: Without dead ends: 1054 [2021-11-23 17:14:56,795 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 41 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 17:14:56,797 INFO L933 BasicCegarLoop]: 1514 mSDtfsCounter, 1469 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1469 SdHoareTripleChecker+Valid, 1565 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 17:14:56,798 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1469 Valid, 1565 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:14:56,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1054 states. [2021-11-23 17:14:56,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1054 to 1052. [2021-11-23 17:14:56,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1052 states, 1050 states have (on average 1.7942857142857143) internal successors, (1884), 1051 states have internal predecessors, (1884), 0 states have call successors, (0), 0 states 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 17:14:56,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1052 states to 1052 states and 1884 transitions. [2021-11-23 17:14:56,842 INFO L78 Accepts]: Start accepts. Automaton has 1052 states and 1884 transitions. Word has length 43 [2021-11-23 17:14:56,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:56,844 INFO L470 AbstractCegarLoop]: Abstraction has 1052 states and 1884 transitions. [2021-11-23 17:14:56,844 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:56,845 INFO L276 IsEmpty]: Start isEmpty. Operand 1052 states and 1884 transitions. [2021-11-23 17:14:56,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 17:14:56,846 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:56,846 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] [2021-11-23 17:14:56,863 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:57,059 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:14:57,059 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:57,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:57,060 INFO L85 PathProgramCache]: Analyzing trace with hash -47574589, now seen corresponding path program 1 times [2021-11-23 17:14:57,060 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:57,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [152893515] [2021-11-23 17:14:57,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:57,061 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:57,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:57,062 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:57,063 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:14:57,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:57,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:14:57,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:57,346 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 17:14:57,347 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:14:57,347 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:57,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [152893515] [2021-11-23 17:14:57,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [152893515] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:14:57,347 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:14:57,348 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:14:57,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994567225] [2021-11-23 17:14:57,348 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:14:57,350 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:14:57,350 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:57,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:14:57,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:14:57,352 INFO L87 Difference]: Start difference. First operand 1052 states and 1884 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:57,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:57,415 INFO L93 Difference]: Finished difference Result 1546 states and 2636 transitions. [2021-11-23 17:14:57,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:14:57,416 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-23 17:14:57,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:57,427 INFO L225 Difference]: With dead ends: 1546 [2021-11-23 17:14:57,427 INFO L226 Difference]: Without dead ends: 1272 [2021-11-23 17:14:57,428 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 41 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 17:14:57,431 INFO L933 BasicCegarLoop]: 1541 mSDtfsCounter, 1477 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1477 SdHoareTripleChecker+Valid, 1603 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 17:14:57,432 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1477 Valid, 1603 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:14:57,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1272 states. [2021-11-23 17:14:57,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1272 to 1270. [2021-11-23 17:14:57,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1270 states, 1268 states have (on average 1.7389589905362777) internal successors, (2205), 1269 states have internal predecessors, (2205), 0 states have call successors, (0), 0 states 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 17:14:57,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1270 states to 1270 states and 2205 transitions. [2021-11-23 17:14:57,484 INFO L78 Accepts]: Start accepts. Automaton has 1270 states and 2205 transitions. Word has length 43 [2021-11-23 17:14:57,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:57,485 INFO L470 AbstractCegarLoop]: Abstraction has 1270 states and 2205 transitions. [2021-11-23 17:14:57,485 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:57,486 INFO L276 IsEmpty]: Start isEmpty. Operand 1270 states and 2205 transitions. [2021-11-23 17:14:57,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 17:14:57,488 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:57,488 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] [2021-11-23 17:14:57,506 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:57,706 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:14:57,707 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:57,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:57,707 INFO L85 PathProgramCache]: Analyzing trace with hash 1199933027, now seen corresponding path program 1 times [2021-11-23 17:14:57,708 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:57,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1547904372] [2021-11-23 17:14:57,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:57,709 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:57,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:57,710 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:57,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:14:57,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:57,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:14:57,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:57,972 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 17:14:57,972 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:14:57,973 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:57,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1547904372] [2021-11-23 17:14:57,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1547904372] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:14:57,973 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:14:57,973 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:14:57,974 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816170177] [2021-11-23 17:14:57,974 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:14:57,974 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:14:57,974 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:57,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:14:57,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:14:57,975 INFO L87 Difference]: Start difference. First operand 1270 states and 2205 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:58,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:58,049 INFO L93 Difference]: Finished difference Result 2146 states and 3509 transitions. [2021-11-23 17:14:58,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:14:58,050 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-23 17:14:58,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:58,062 INFO L225 Difference]: With dead ends: 2146 [2021-11-23 17:14:58,062 INFO L226 Difference]: Without dead ends: 1654 [2021-11-23 17:14:58,063 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 41 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 17:14:58,064 INFO L933 BasicCegarLoop]: 1554 mSDtfsCounter, 1481 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1481 SdHoareTripleChecker+Valid, 1612 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 17:14:58,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1481 Valid, 1612 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:14:58,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1654 states. [2021-11-23 17:14:58,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1654 to 1652. [2021-11-23 17:14:58,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1652 states, 1650 states have (on average 1.6654545454545455) internal successors, (2748), 1651 states have internal predecessors, (2748), 0 states have call successors, (0), 0 states 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 17:14:58,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1652 states to 1652 states and 2748 transitions. [2021-11-23 17:14:58,137 INFO L78 Accepts]: Start accepts. Automaton has 1652 states and 2748 transitions. Word has length 43 [2021-11-23 17:14:58,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:58,137 INFO L470 AbstractCegarLoop]: Abstraction has 1652 states and 2748 transitions. [2021-11-23 17:14:58,137 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:58,138 INFO L276 IsEmpty]: Start isEmpty. Operand 1652 states and 2748 transitions. [2021-11-23 17:14:58,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 17:14:58,138 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:58,138 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] [2021-11-23 17:14:58,151 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Ended with exit code 0 [2021-11-23 17:14:58,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:14:58,353 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:58,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:58,354 INFO L85 PathProgramCache]: Analyzing trace with hash -1511296967, now seen corresponding path program 1 times [2021-11-23 17:14:58,354 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:58,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1893038221] [2021-11-23 17:14:58,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:58,355 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:58,355 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:58,356 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:58,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:14:58,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:58,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:14:58,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:58,557 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 17:14:58,557 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:14:58,557 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:58,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1893038221] [2021-11-23 17:14:58,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1893038221] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:14:58,558 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:14:58,558 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:14:58,558 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380719185] [2021-11-23 17:14:58,559 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:14:58,559 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:14:58,559 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:58,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:14:58,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:14:58,561 INFO L87 Difference]: Start difference. First operand 1652 states and 2748 transitions. Second operand has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:58,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:58,770 INFO L93 Difference]: Finished difference Result 2498 states and 3940 transitions. [2021-11-23 17:14:58,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:14:58,771 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-23 17:14:58,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:58,789 INFO L225 Difference]: With dead ends: 2498 [2021-11-23 17:14:58,789 INFO L226 Difference]: Without dead ends: 2496 [2021-11-23 17:14:58,791 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:14:58,792 INFO L933 BasicCegarLoop]: 1534 mSDtfsCounter, 139 mSDsluCounter, 4544 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 6078 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:14:58,792 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 6078 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:14:58,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2496 states. [2021-11-23 17:14:58,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2496 to 1736. [2021-11-23 17:14:58,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1736 states, 1734 states have (on average 1.6309111880046137) internal successors, (2828), 1735 states have internal predecessors, (2828), 0 states have call successors, (0), 0 states 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 17:14:58,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1736 states to 1736 states and 2828 transitions. [2021-11-23 17:14:58,895 INFO L78 Accepts]: Start accepts. Automaton has 1736 states and 2828 transitions. Word has length 44 [2021-11-23 17:14:58,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:58,895 INFO L470 AbstractCegarLoop]: Abstraction has 1736 states and 2828 transitions. [2021-11-23 17:14:58,895 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:58,896 INFO L276 IsEmpty]: Start isEmpty. Operand 1736 states and 2828 transitions. [2021-11-23 17:14:58,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:14:58,897 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:58,897 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, 1, 1, 1, 1] [2021-11-23 17:14:58,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:59,112 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:14:59,112 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:59,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:59,113 INFO L85 PathProgramCache]: Analyzing trace with hash -523945775, now seen corresponding path program 1 times [2021-11-23 17:14:59,113 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:59,113 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1922189467] [2021-11-23 17:14:59,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:59,114 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:59,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:59,115 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:59,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:14:59,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:59,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:14:59,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:59,464 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 17:14:59,465 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:14:59,465 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:59,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1922189467] [2021-11-23 17:14:59,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1922189467] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:14:59,465 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:14:59,465 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:14:59,465 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182051226] [2021-11-23 17:14:59,466 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:14:59,466 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:14:59,466 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:59,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:14:59,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:14:59,467 INFO L87 Difference]: Start difference. First operand 1736 states and 2828 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 states have internal predecessors, (63), 0 states have call successors, (0), 0 states 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 17:15:38,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:38,822 INFO L93 Difference]: Finished difference Result 3240 states and 5701 transitions. [2021-11-23 17:15:38,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:15:38,824 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 states have internal predecessors, (63), 0 states have call successors, (0), 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 63 [2021-11-23 17:15:38,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:38,841 INFO L225 Difference]: With dead ends: 3240 [2021-11-23 17:15:38,842 INFO L226 Difference]: Without dead ends: 2487 [2021-11-23 17:15:38,844 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 61 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 17:15:38,847 INFO L933 BasicCegarLoop]: 499 mSDtfsCounter, 833 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2274 mSolverCounterSat, 591 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 32.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 833 SdHoareTripleChecker+Valid, 506 SdHoareTripleChecker+Invalid, 2865 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 591 IncrementalHoareTripleChecker+Valid, 2274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 39.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:38,847 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [833 Valid, 506 Invalid, 2865 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [591 Valid, 2274 Invalid, 0 Unknown, 0 Unchecked, 39.2s Time] [2021-11-23 17:15:38,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2487 states. [2021-11-23 17:15:38,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2487 to 2487. [2021-11-23 17:15:38,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2487 states, 2485 states have (on average 1.551307847082495) internal successors, (3855), 2486 states have internal predecessors, (3855), 0 states have call successors, (0), 0 states 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 17:15:38,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2487 states to 2487 states and 3855 transitions. [2021-11-23 17:15:38,971 INFO L78 Accepts]: Start accepts. Automaton has 2487 states and 3855 transitions. Word has length 63 [2021-11-23 17:15:38,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:38,972 INFO L470 AbstractCegarLoop]: Abstraction has 2487 states and 3855 transitions. [2021-11-23 17:15:38,973 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 states have internal predecessors, (63), 0 states have call successors, (0), 0 states 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 17:15:38,973 INFO L276 IsEmpty]: Start isEmpty. Operand 2487 states and 3855 transitions. [2021-11-23 17:15:38,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:15:38,974 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:38,975 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:15:38,992 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:39,187 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:39,187 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:39,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:39,188 INFO L85 PathProgramCache]: Analyzing trace with hash -213997176, now seen corresponding path program 1 times [2021-11-23 17:15:39,189 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:39,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1514218466] [2021-11-23 17:15:39,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:39,190 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:39,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:39,191 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:39,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:15:39,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:39,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:39,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:40,630 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 17:15:40,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:41,609 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 17:15:41,610 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:41,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1514218466] [2021-11-23 17:15:41,610 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1514218466] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:41,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [617662958] [2021-11-23 17:15:41,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:41,611 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:41,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:15:41,613 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:15:41,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-11-23 17:15:41,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:41,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:15:41,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:41,950 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 17:15:41,950 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:41,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [617662958] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:41,950 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:15:41,950 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 17:15:41,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547549398] [2021-11-23 17:15:41,951 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:41,951 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:15:41,951 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:41,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:15:41,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:15:41,952 INFO L87 Difference]: Start difference. First operand 2487 states and 3855 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:42,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:42,050 INFO L93 Difference]: Finished difference Result 3447 states and 5221 transitions. [2021-11-23 17:15:42,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:15:42,051 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-23 17:15:42,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:42,069 INFO L225 Difference]: With dead ends: 3447 [2021-11-23 17:15:42,069 INFO L226 Difference]: Without dead ends: 2489 [2021-11-23 17:15:42,072 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:15:42,073 INFO L933 BasicCegarLoop]: 1538 mSDtfsCounter, 33 mSDsluCounter, 1504 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 3042 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 17:15:42,074 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 3042 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:15:42,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2489 states. [2021-11-23 17:15:42,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2489 to 2487. [2021-11-23 17:15:42,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2487 states, 2485 states have (on average 1.5440643863179075) internal successors, (3837), 2486 states have internal predecessors, (3837), 0 states have call successors, (0), 0 states 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 17:15:42,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2487 states to 2487 states and 3837 transitions. [2021-11-23 17:15:42,184 INFO L78 Accepts]: Start accepts. Automaton has 2487 states and 3837 transitions. Word has length 64 [2021-11-23 17:15:42,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:42,184 INFO L470 AbstractCegarLoop]: Abstraction has 2487 states and 3837 transitions. [2021-11-23 17:15:42,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:42,185 INFO L276 IsEmpty]: Start isEmpty. Operand 2487 states and 3837 transitions. [2021-11-23 17:15:42,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:15:42,186 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:42,187 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:15:42,194 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:42,399 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:42,592 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:42,592 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:42,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:42,593 INFO L85 PathProgramCache]: Analyzing trace with hash 1584307858, now seen corresponding path program 1 times [2021-11-23 17:15:42,593 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:42,594 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1481927924] [2021-11-23 17:15:42,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:42,594 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:42,594 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:42,595 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:42,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 17:15:42,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:42,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:42,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:43,944 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:43,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:44,842 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:44,843 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:44,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1481927924] [2021-11-23 17:15:44,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1481927924] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:44,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [954355640] [2021-11-23 17:15:44,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:44,843 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:44,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:15:44,848 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:15:44,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-23 17:15:44,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:45,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:45,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:45,992 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:45,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:46,709 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:46,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [954355640] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:46,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1330978876] [2021-11-23 17:15:46,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:46,710 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:15:46,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:15:46,712 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:15:46,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 17:15:46,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:46,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:46,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:47,801 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:47,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:48,474 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:48,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1330978876] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:48,475 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:15:48,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:15:48,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246165466] [2021-11-23 17:15:48,476 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:15:48,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:15:48,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:48,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:15:48,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:15:48,478 INFO L87 Difference]: Start difference. First operand 2487 states and 3837 transitions. Second operand has 16 states, 16 states have (on average 6.9375) internal successors, (111), 15 states have internal predecessors, (111), 0 states have call successors, (0), 0 states 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 17:15:48,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:48,895 INFO L93 Difference]: Finished difference Result 3184 states and 4827 transitions. [2021-11-23 17:15:48,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:15:48,896 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 6.9375) internal successors, (111), 15 states have internal predecessors, (111), 0 states have call successors, (0), 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 64 [2021-11-23 17:15:48,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:48,912 INFO L225 Difference]: With dead ends: 3184 [2021-11-23 17:15:48,912 INFO L226 Difference]: Without dead ends: 2510 [2021-11-23 17:15:48,915 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 364 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:15:48,915 INFO L933 BasicCegarLoop]: 1502 mSDtfsCounter, 4361 mSDsluCounter, 11968 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4361 SdHoareTripleChecker+Valid, 13470 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 53 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:48,916 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4361 Valid, 13470 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 44 Invalid, 0 Unknown, 53 Unchecked, 0.1s Time] [2021-11-23 17:15:48,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2510 states. [2021-11-23 17:15:49,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2510 to 2509. [2021-11-23 17:15:49,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2509 states, 2507 states have (on average 1.540885520542481) internal successors, (3863), 2508 states have internal predecessors, (3863), 0 states have call successors, (0), 0 states 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 17:15:49,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2509 states to 2509 states and 3863 transitions. [2021-11-23 17:15:49,015 INFO L78 Accepts]: Start accepts. Automaton has 2509 states and 3863 transitions. Word has length 64 [2021-11-23 17:15:49,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:49,016 INFO L470 AbstractCegarLoop]: Abstraction has 2509 states and 3863 transitions. [2021-11-23 17:15:49,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 6.9375) internal successors, (111), 15 states have internal predecessors, (111), 0 states have call successors, (0), 0 states 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 17:15:49,016 INFO L276 IsEmpty]: Start isEmpty. Operand 2509 states and 3863 transitions. [2021-11-23 17:15:49,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:15:49,018 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:49,018 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:15:49,037 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:49,241 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:49,495 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:49,640 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:15:49,640 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:49,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:49,641 INFO L85 PathProgramCache]: Analyzing trace with hash -2129817016, now seen corresponding path program 1 times [2021-11-23 17:15:49,641 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:49,641 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [940042059] [2021-11-23 17:15:49,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:49,641 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:49,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:49,643 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:49,645 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 17:15:49,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:49,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:49,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:51,187 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 17:15:51,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:51,718 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 17:15:51,718 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:51,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [940042059] [2021-11-23 17:15:51,718 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [940042059] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:51,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1072180540] [2021-11-23 17:15:51,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:51,719 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:51,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:15:51,720 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:15:51,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-23 17:15:51,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:51,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:15:51,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:51,993 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 17:15:51,994 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:51,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1072180540] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:51,994 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:15:51,994 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 17:15:51,994 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772524234] [2021-11-23 17:15:51,995 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:51,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:15:51,995 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:51,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:15:51,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:15:51,996 INFO L87 Difference]: Start difference. First operand 2509 states and 3863 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:52,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:52,055 INFO L93 Difference]: Finished difference Result 2991 states and 4538 transitions. [2021-11-23 17:15:52,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:15:52,056 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-23 17:15:52,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:52,069 INFO L225 Difference]: With dead ends: 2991 [2021-11-23 17:15:52,069 INFO L226 Difference]: Without dead ends: 2033 [2021-11-23 17:15:52,071 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:15:52,073 INFO L933 BasicCegarLoop]: 1531 mSDtfsCounter, 27 mSDsluCounter, 1496 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 3027 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 17:15:52,073 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 3027 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:15:52,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2033 states. [2021-11-23 17:15:52,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2033 to 2031. [2021-11-23 17:15:52,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2031 states, 2029 states have (on average 1.5677673730901922) internal successors, (3181), 2030 states have internal predecessors, (3181), 0 states have call successors, (0), 0 states 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 17:15:52,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2031 states to 2031 states and 3181 transitions. [2021-11-23 17:15:52,151 INFO L78 Accepts]: Start accepts. Automaton has 2031 states and 3181 transitions. Word has length 64 [2021-11-23 17:15:52,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:52,152 INFO L470 AbstractCegarLoop]: Abstraction has 2031 states and 3181 transitions. [2021-11-23 17:15:52,152 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:52,152 INFO L276 IsEmpty]: Start isEmpty. Operand 2031 states and 3181 transitions. [2021-11-23 17:15:52,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:15:52,156 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:52,156 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:15:52,160 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:52,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:52,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:52,565 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:52,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:52,565 INFO L85 PathProgramCache]: Analyzing trace with hash 947164882, now seen corresponding path program 1 times [2021-11-23 17:15:52,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:52,566 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1077590405] [2021-11-23 17:15:52,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:52,566 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:52,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:52,568 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:52,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 17:15:52,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:52,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:52,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:54,253 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:54,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:54,725 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:54,726 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:54,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1077590405] [2021-11-23 17:15:54,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1077590405] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:54,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [488960909] [2021-11-23 17:15:54,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:54,727 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:54,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:15:54,727 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:15:54,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-23 17:15:54,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:54,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:54,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:56,119 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:56,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:56,493 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:56,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [488960909] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:56,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [430749956] [2021-11-23 17:15:56,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:56,493 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:15:56,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:15:56,495 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:15:56,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 17:15:56,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:56,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:56,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:57,742 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:57,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:58,100 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:58,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [430749956] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:58,100 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:15:58,100 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:15:58,101 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992693341] [2021-11-23 17:15:58,101 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:15:58,102 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:15:58,102 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:58,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:15:58,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:15:58,103 INFO L87 Difference]: Start difference. First operand 2031 states and 3181 transitions. Second operand has 16 states, 16 states have (on average 7.3125) internal successors, (117), 15 states have internal predecessors, (117), 0 states have call successors, (0), 0 states 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 17:15:58,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:58,525 INFO L93 Difference]: Finished difference Result 2406 states and 3702 transitions. [2021-11-23 17:15:58,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:15:58,526 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.3125) internal successors, (117), 15 states have internal predecessors, (117), 0 states have call successors, (0), 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 64 [2021-11-23 17:15:58,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:58,539 INFO L225 Difference]: With dead ends: 2406 [2021-11-23 17:15:58,539 INFO L226 Difference]: Without dead ends: 2068 [2021-11-23 17:15:58,541 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 365 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:15:58,543 INFO L933 BasicCegarLoop]: 1501 mSDtfsCounter, 5857 mSDsluCounter, 12061 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5857 SdHoareTripleChecker+Valid, 13562 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 135 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:58,543 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5857 Valid, 13562 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 50 Invalid, 0 Unknown, 135 Unchecked, 0.1s Time] [2021-11-23 17:15:58,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2068 states. [2021-11-23 17:15:58,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2068 to 2041. [2021-11-23 17:15:58,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2041 states, 2039 states have (on average 1.565963707699853) internal successors, (3193), 2040 states have internal predecessors, (3193), 0 states have call successors, (0), 0 states 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 17:15:58,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2041 states to 2041 states and 3193 transitions. [2021-11-23 17:15:58,625 INFO L78 Accepts]: Start accepts. Automaton has 2041 states and 3193 transitions. Word has length 64 [2021-11-23 17:15:58,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:58,625 INFO L470 AbstractCegarLoop]: Abstraction has 2041 states and 3193 transitions. [2021-11-23 17:15:58,626 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.3125) internal successors, (117), 15 states have internal predecessors, (117), 0 states have call successors, (0), 0 states 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 17:15:58,626 INFO L276 IsEmpty]: Start isEmpty. Operand 2041 states and 3193 transitions. [2021-11-23 17:15:58,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:15:58,631 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:58,632 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:15:58,713 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:58,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:59,061 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:59,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:59,256 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:59,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:59,256 INFO L85 PathProgramCache]: Analyzing trace with hash -1514914168, now seen corresponding path program 1 times [2021-11-23 17:15:59,257 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:59,257 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [480780419] [2021-11-23 17:15:59,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:59,257 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:59,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:59,259 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:59,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 17:15:59,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:59,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:15:59,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:59,464 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 17:15:59,464 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:59,464 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:59,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [480780419] [2021-11-23 17:15:59,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [480780419] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:59,464 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:59,464 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:15:59,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581876424] [2021-11-23 17:15:59,465 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:59,468 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:15:59,468 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:59,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:15:59,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:59,469 INFO L87 Difference]: Start difference. First operand 2041 states and 3193 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:59,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:59,523 INFO L93 Difference]: Finished difference Result 2233 states and 3455 transitions. [2021-11-23 17:15:59,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:15:59,524 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-23 17:15:59,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:59,545 INFO L225 Difference]: With dead ends: 2233 [2021-11-23 17:15:59,551 INFO L226 Difference]: Without dead ends: 1753 [2021-11-23 17:15:59,552 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 62 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 17:15:59,553 INFO L933 BasicCegarLoop]: 1525 mSDtfsCounter, 17 mSDsluCounter, 1496 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 3021 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 17:15:59,554 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 3021 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:15:59,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1753 states. [2021-11-23 17:15:59,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1753 to 1745. [2021-11-23 17:15:59,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1745 states, 1743 states have (on average 1.5938037865748709) internal successors, (2778), 1744 states have internal predecessors, (2778), 0 states have call successors, (0), 0 states 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 17:15:59,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1745 states to 1745 states and 2778 transitions. [2021-11-23 17:15:59,623 INFO L78 Accepts]: Start accepts. Automaton has 1745 states and 2778 transitions. Word has length 64 [2021-11-23 17:15:59,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:59,623 INFO L470 AbstractCegarLoop]: Abstraction has 1745 states and 2778 transitions. [2021-11-23 17:15:59,624 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:59,625 INFO L276 IsEmpty]: Start isEmpty. Operand 1745 states and 2778 transitions. [2021-11-23 17:15:59,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:15:59,626 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:59,626 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:15:59,643 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:59,839 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:59,839 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:59,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:59,840 INFO L85 PathProgramCache]: Analyzing trace with hash -2009059564, now seen corresponding path program 1 times [2021-11-23 17:15:59,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:59,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1984440230] [2021-11-23 17:15:59,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:59,840 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:59,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:59,842 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:59,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:15:59,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:59,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:15:59,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:00,429 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:16:00,430 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:00,430 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:00,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1984440230] [2021-11-23 17:16:00,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1984440230] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:00,430 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:00,430 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:16:00,431 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202920746] [2021-11-23 17:16:00,431 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:00,431 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:16:00,431 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:00,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:16:00,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:16:00,432 INFO L87 Difference]: Start difference. First operand 1745 states and 2778 transitions. Second operand has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 5 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:00,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:00,528 INFO L93 Difference]: Finished difference Result 1921 states and 3019 transitions. [2021-11-23 17:16:00,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:16:00,529 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 5 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-23 17:16:00,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:00,542 INFO L225 Difference]: With dead ends: 1921 [2021-11-23 17:16:00,542 INFO L226 Difference]: Without dead ends: 1745 [2021-11-23 17:16:00,545 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:16:00,546 INFO L933 BasicCegarLoop]: 1506 mSDtfsCounter, 2899 mSDsluCounter, 2960 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2899 SdHoareTripleChecker+Valid, 4466 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 14 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:00,546 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2899 Valid, 4466 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 13 Invalid, 0 Unknown, 14 Unchecked, 0.0s Time] [2021-11-23 17:16:00,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1745 states. [2021-11-23 17:16:00,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1745 to 1745. [2021-11-23 17:16:00,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1745 states, 1743 states have (on average 1.5932300631095813) internal successors, (2777), 1744 states have internal predecessors, (2777), 0 states have call successors, (0), 0 states 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 17:16:00,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1745 states to 1745 states and 2777 transitions. [2021-11-23 17:16:00,602 INFO L78 Accepts]: Start accepts. Automaton has 1745 states and 2777 transitions. Word has length 64 [2021-11-23 17:16:00,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:00,602 INFO L470 AbstractCegarLoop]: Abstraction has 1745 states and 2777 transitions. [2021-11-23 17:16:00,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 5 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:00,603 INFO L276 IsEmpty]: Start isEmpty. Operand 1745 states and 2777 transitions. [2021-11-23 17:16:00,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:16:00,604 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:00,604 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:16:00,620 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:00,817 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:00,817 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:00,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:00,817 INFO L85 PathProgramCache]: Analyzing trace with hash 740302356, now seen corresponding path program 1 times [2021-11-23 17:16:00,818 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:00,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [624194623] [2021-11-23 17:16:00,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:00,818 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:00,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:00,819 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:00,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 17:16:00,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:00,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:16:00,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:01,320 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:16:01,320 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:01,321 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:01,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [624194623] [2021-11-23 17:16:01,321 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [624194623] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:01,321 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:01,321 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:16:01,322 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875252115] [2021-11-23 17:16:01,322 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:01,322 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:16:01,323 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:01,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:16:01,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:16:01,324 INFO L87 Difference]: Start difference. First operand 1745 states and 2777 transitions. Second operand has 6 states, 6 states have (on average 10.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:01,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:01,442 INFO L93 Difference]: Finished difference Result 1925 states and 3023 transitions. [2021-11-23 17:16:01,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:16:01,443 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-23 17:16:01,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:01,449 INFO L225 Difference]: With dead ends: 1925 [2021-11-23 17:16:01,449 INFO L226 Difference]: Without dead ends: 1745 [2021-11-23 17:16:01,451 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:16:01,451 INFO L933 BasicCegarLoop]: 1509 mSDtfsCounter, 1458 mSDsluCounter, 3014 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1458 SdHoareTripleChecker+Valid, 4523 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 27 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:01,452 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1458 Valid, 4523 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 27 Unchecked, 0.1s Time] [2021-11-23 17:16:01,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1745 states. [2021-11-23 17:16:01,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1745 to 1745. [2021-11-23 17:16:01,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1745 states, 1743 states have (on average 1.5926563396442914) internal successors, (2776), 1744 states have internal predecessors, (2776), 0 states have call successors, (0), 0 states 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 17:16:01,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1745 states to 1745 states and 2776 transitions. [2021-11-23 17:16:01,506 INFO L78 Accepts]: Start accepts. Automaton has 1745 states and 2776 transitions. Word has length 64 [2021-11-23 17:16:01,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:01,507 INFO L470 AbstractCegarLoop]: Abstraction has 1745 states and 2776 transitions. [2021-11-23 17:16:01,507 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:01,507 INFO L276 IsEmpty]: Start isEmpty. Operand 1745 states and 2776 transitions. [2021-11-23 17:16:01,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:16:01,508 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:01,509 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:16:01,525 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:01,721 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:01,721 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:01,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:01,722 INFO L85 PathProgramCache]: Analyzing trace with hash -261059308, now seen corresponding path program 1 times [2021-11-23 17:16:01,722 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:01,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [611896962] [2021-11-23 17:16:01,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:01,722 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:01,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:01,723 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:01,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:16:01,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:01,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:16:01,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:02,239 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:16:02,240 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:02,240 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:02,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [611896962] [2021-11-23 17:16:02,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [611896962] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:02,240 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:02,240 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:16:02,240 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223007581] [2021-11-23 17:16:02,240 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:02,241 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:16:02,241 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:02,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:16:02,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:16:02,241 INFO L87 Difference]: Start difference. First operand 1745 states and 2776 transitions. Second operand has 6 states, 6 states have (on average 9.833333333333334) internal successors, (59), 5 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 17:16:02,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:02,326 INFO L93 Difference]: Finished difference Result 1915 states and 3011 transitions. [2021-11-23 17:16:02,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:16:02,326 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.833333333333334) internal successors, (59), 5 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 64 [2021-11-23 17:16:02,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:02,330 INFO L225 Difference]: With dead ends: 1915 [2021-11-23 17:16:02,330 INFO L226 Difference]: Without dead ends: 1731 [2021-11-23 17:16:02,332 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:16:02,333 INFO L933 BasicCegarLoop]: 1512 mSDtfsCounter, 2905 mSDsluCounter, 1535 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2905 SdHoareTripleChecker+Valid, 3047 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:02,333 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2905 Valid, 3047 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 26 Unchecked, 0.0s Time] [2021-11-23 17:16:02,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1731 states. [2021-11-23 17:16:02,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1731 to 1731. [2021-11-23 17:16:02,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1731 states, 1729 states have (on average 1.59572006940428) internal successors, (2759), 1730 states have internal predecessors, (2759), 0 states have call successors, (0), 0 states 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 17:16:02,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1731 states to 1731 states and 2759 transitions. [2021-11-23 17:16:02,384 INFO L78 Accepts]: Start accepts. Automaton has 1731 states and 2759 transitions. Word has length 64 [2021-11-23 17:16:02,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:02,384 INFO L470 AbstractCegarLoop]: Abstraction has 1731 states and 2759 transitions. [2021-11-23 17:16:02,384 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.833333333333334) internal successors, (59), 5 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 17:16:02,385 INFO L276 IsEmpty]: Start isEmpty. Operand 1731 states and 2759 transitions. [2021-11-23 17:16:02,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 17:16:02,386 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:02,386 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:16:02,408 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:02,600 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:02,600 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:02,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:02,600 INFO L85 PathProgramCache]: Analyzing trace with hash -2023735102, now seen corresponding path program 1 times [2021-11-23 17:16:02,601 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:02,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [686763777] [2021-11-23 17:16:02,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:02,601 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:02,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:02,602 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:02,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 17:16:02,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:02,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:16:02,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:03,915 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:03,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:04,620 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:04,621 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:04,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [686763777] [2021-11-23 17:16:04,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [686763777] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:04,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1227684335] [2021-11-23 17:16:04,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:04,622 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:04,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:16:04,634 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:16:04,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-23 17:16:04,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:04,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:16:04,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:06,000 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:06,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:06,449 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:06,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1227684335] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:06,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [581553928] [2021-11-23 17:16:06,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:06,450 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:16:06,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:16:06,460 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:16:06,477 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-23 17:16:06,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:06,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:16:06,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:07,918 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:07,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:08,439 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:08,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [581553928] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:08,439 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:16:08,440 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:16:08,440 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769323252] [2021-11-23 17:16:08,440 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:16:08,441 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:16:08,441 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:08,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:16:08,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:16:08,442 INFO L87 Difference]: Start difference. First operand 1731 states and 2759 transitions. Second operand has 16 states, 16 states have (on average 7.6875) internal successors, (123), 15 states have internal predecessors, (123), 0 states have call successors, (0), 0 states 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 17:16:08,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:08,651 INFO L93 Difference]: Finished difference Result 1913 states and 3012 transitions. [2021-11-23 17:16:08,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 17:16:08,651 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.6875) internal successors, (123), 15 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-23 17:16:08,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:08,654 INFO L225 Difference]: With dead ends: 1913 [2021-11-23 17:16:08,654 INFO L226 Difference]: Without dead ends: 1743 [2021-11-23 17:16:08,655 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 371 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:16:08,657 INFO L933 BasicCegarLoop]: 1500 mSDtfsCounter, 2938 mSDsluCounter, 14969 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2938 SdHoareTripleChecker+Valid, 16469 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 68 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:08,657 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2938 Valid, 16469 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 68 Unchecked, 0.0s Time] [2021-11-23 17:16:08,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1743 states. [2021-11-23 17:16:08,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1743 to 1743. [2021-11-23 17:16:08,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1743 states, 1741 states have (on average 1.5939115450890293) internal successors, (2775), 1742 states have internal predecessors, (2775), 0 states have call successors, (0), 0 states 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 17:16:08,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1743 states to 1743 states and 2775 transitions. [2021-11-23 17:16:08,701 INFO L78 Accepts]: Start accepts. Automaton has 1743 states and 2775 transitions. Word has length 65 [2021-11-23 17:16:08,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:08,701 INFO L470 AbstractCegarLoop]: Abstraction has 1743 states and 2775 transitions. [2021-11-23 17:16:08,701 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.6875) internal successors, (123), 15 states have internal predecessors, (123), 0 states have call successors, (0), 0 states 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 17:16:08,702 INFO L276 IsEmpty]: Start isEmpty. Operand 1743 states and 2775 transitions. [2021-11-23 17:16:08,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 17:16:08,703 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:08,703 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:16:08,704 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:08,924 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:09,112 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:09,305 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:09,305 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:09,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:09,305 INFO L85 PathProgramCache]: Analyzing trace with hash -94088951, now seen corresponding path program 1 times [2021-11-23 17:16:09,305 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:09,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1449691099] [2021-11-23 17:16:09,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:09,306 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:09,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:09,307 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:09,309 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 17:16:09,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:09,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:16:09,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:09,935 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:16:09,935 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:09,936 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:09,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1449691099] [2021-11-23 17:16:09,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1449691099] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:09,936 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:09,936 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:16:09,936 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075454806] [2021-11-23 17:16:09,936 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:09,937 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:16:09,937 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:09,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:16:09,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:16:09,937 INFO L87 Difference]: Start difference. First operand 1743 states and 2775 transitions. Second operand has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states 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 17:16:10,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:10,076 INFO L93 Difference]: Finished difference Result 1979 states and 3097 transitions. [2021-11-23 17:16:10,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:16:10,076 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 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 66 [2021-11-23 17:16:10,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:10,081 INFO L225 Difference]: With dead ends: 1979 [2021-11-23 17:16:10,081 INFO L226 Difference]: Without dead ends: 1809 [2021-11-23 17:16:10,082 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:16:10,084 INFO L933 BasicCegarLoop]: 1569 mSDtfsCounter, 1610 mSDsluCounter, 1609 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1610 SdHoareTripleChecker+Valid, 3178 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:10,084 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1610 Valid, 3178 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:16:10,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1809 states. [2021-11-23 17:16:10,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1809 to 1743. [2021-11-23 17:16:10,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1743 states, 1741 states have (on average 1.5904652498564045) internal successors, (2769), 1742 states have internal predecessors, (2769), 0 states have call successors, (0), 0 states 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 17:16:10,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1743 states to 1743 states and 2769 transitions. [2021-11-23 17:16:10,125 INFO L78 Accepts]: Start accepts. Automaton has 1743 states and 2769 transitions. Word has length 66 [2021-11-23 17:16:10,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:10,126 INFO L470 AbstractCegarLoop]: Abstraction has 1743 states and 2769 transitions. [2021-11-23 17:16:10,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states 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 17:16:10,126 INFO L276 IsEmpty]: Start isEmpty. Operand 1743 states and 2769 transitions. [2021-11-23 17:16:10,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 17:16:10,127 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:10,128 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:16:10,140 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:10,339 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:10,340 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:10,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:10,340 INFO L85 PathProgramCache]: Analyzing trace with hash 1408270156, now seen corresponding path program 1 times [2021-11-23 17:16:10,340 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:10,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1052844091] [2021-11-23 17:16:10,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:10,341 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:10,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:10,342 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:10,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 17:16:10,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:10,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:16:10,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:10,920 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:16:10,920 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:10,921 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:10,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1052844091] [2021-11-23 17:16:10,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1052844091] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:10,921 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:10,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:16:10,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197150921] [2021-11-23 17:16:10,922 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:10,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:16:10,923 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:10,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:16:10,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:16:10,924 INFO L87 Difference]: Start difference. First operand 1743 states and 2769 transitions. Second operand has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:11,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:11,070 INFO L93 Difference]: Finished difference Result 1923 states and 3017 transitions. [2021-11-23 17:16:11,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:16:11,071 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-23 17:16:11,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:11,076 INFO L225 Difference]: With dead ends: 1923 [2021-11-23 17:16:11,076 INFO L226 Difference]: Without dead ends: 1865 [2021-11-23 17:16:11,077 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:16:11,078 INFO L933 BasicCegarLoop]: 1575 mSDtfsCounter, 3056 mSDsluCounter, 1612 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3056 SdHoareTripleChecker+Valid, 3187 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:11,079 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3056 Valid, 3187 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:16:11,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1865 states. [2021-11-23 17:16:11,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1865 to 1803. [2021-11-23 17:16:11,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1803 states, 1801 states have (on average 1.580788450860633) internal successors, (2847), 1802 states have internal predecessors, (2847), 0 states have call successors, (0), 0 states 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 17:16:11,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1803 states to 1803 states and 2847 transitions. [2021-11-23 17:16:11,131 INFO L78 Accepts]: Start accepts. Automaton has 1803 states and 2847 transitions. Word has length 66 [2021-11-23 17:16:11,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:11,131 INFO L470 AbstractCegarLoop]: Abstraction has 1803 states and 2847 transitions. [2021-11-23 17:16:11,131 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:11,132 INFO L276 IsEmpty]: Start isEmpty. Operand 1803 states and 2847 transitions. [2021-11-23 17:16:11,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 17:16:11,133 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:11,133 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:16:11,152 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:11,348 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:11,349 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:11,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:11,350 INFO L85 PathProgramCache]: Analyzing trace with hash 52806377, now seen corresponding path program 1 times [2021-11-23 17:16:11,350 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:11,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1120818442] [2021-11-23 17:16:11,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:11,351 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:11,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:11,352 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:11,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 17:16:11,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:11,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:16:11,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:12,017 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:16:12,017 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:12,018 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:12,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1120818442] [2021-11-23 17:16:12,018 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1120818442] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:12,018 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:12,018 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:16:12,018 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047808667] [2021-11-23 17:16:12,019 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:12,019 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:16:12,019 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:12,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:16:12,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:16:12,020 INFO L87 Difference]: Start difference. First operand 1803 states and 2847 transitions. Second operand has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:12,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:12,161 INFO L93 Difference]: Finished difference Result 1983 states and 3095 transitions. [2021-11-23 17:16:12,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:16:12,162 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-23 17:16:12,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:12,167 INFO L225 Difference]: With dead ends: 1983 [2021-11-23 17:16:12,167 INFO L226 Difference]: Without dead ends: 1925 [2021-11-23 17:16:12,168 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:16:12,170 INFO L933 BasicCegarLoop]: 1572 mSDtfsCounter, 3055 mSDsluCounter, 1609 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3055 SdHoareTripleChecker+Valid, 3181 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:12,170 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3055 Valid, 3181 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:16:12,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1925 states. [2021-11-23 17:16:12,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1925 to 1863. [2021-11-23 17:16:12,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1863 states, 1861 states have (on average 1.5717356260075228) internal successors, (2925), 1862 states have internal predecessors, (2925), 0 states have call successors, (0), 0 states 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 17:16:12,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1863 states to 1863 states and 2925 transitions. [2021-11-23 17:16:12,225 INFO L78 Accepts]: Start accepts. Automaton has 1863 states and 2925 transitions. Word has length 66 [2021-11-23 17:16:12,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:12,225 INFO L470 AbstractCegarLoop]: Abstraction has 1863 states and 2925 transitions. [2021-11-23 17:16:12,225 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:12,226 INFO L276 IsEmpty]: Start isEmpty. Operand 1863 states and 2925 transitions. [2021-11-23 17:16:12,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 17:16:12,227 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:12,227 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:16:12,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:12,442 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:12,442 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:12,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:12,443 INFO L85 PathProgramCache]: Analyzing trace with hash -791645332, now seen corresponding path program 1 times [2021-11-23 17:16:12,443 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:12,443 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [726978347] [2021-11-23 17:16:12,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:12,444 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:12,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:12,445 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:12,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 17:16:12,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:12,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:16:12,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:16,078 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:16,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:18,360 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:18,360 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:18,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [726978347] [2021-11-23 17:16:18,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [726978347] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:18,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [265060395] [2021-11-23 17:16:18,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:18,361 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:18,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:16:18,367 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:16:18,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-23 17:16:18,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:18,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:16:18,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:21,186 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:21,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:22,142 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:22,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [265060395] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:22,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051414645] [2021-11-23 17:16:22,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:22,142 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:16:22,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:16:22,143 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:16:22,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-23 17:16:22,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:22,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:16:22,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:25,935 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:25,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:27,273 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:27,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1051414645] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:27,274 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:16:27,274 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 22, 20, 18, 17] total 56 [2021-11-23 17:16:27,274 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555319297] [2021-11-23 17:16:27,274 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:16:27,275 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-23 17:16:27,275 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:27,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-23 17:16:27,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=2714, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 17:16:27,276 INFO L87 Difference]: Start difference. First operand 1863 states and 2925 transitions. Second operand has 56 states, 56 states have (on average 3.392857142857143) internal successors, (190), 56 states have internal predecessors, (190), 0 states have call successors, (0), 0 states 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 17:16:28,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:28,249 INFO L93 Difference]: Finished difference Result 1993 states and 3098 transitions. [2021-11-23 17:16:28,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:16:28,252 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.392857142857143) internal successors, (190), 56 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-23 17:16:28,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:28,256 INFO L225 Difference]: With dead ends: 1993 [2021-11-23 17:16:28,256 INFO L226 Difference]: Without dead ends: 1875 [2021-11-23 17:16:28,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 345 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1295 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=448, Invalid=2974, Unknown=0, NotChecked=0, Total=3422 [2021-11-23 17:16:28,259 INFO L933 BasicCegarLoop]: 1497 mSDtfsCounter, 7328 mSDsluCounter, 28479 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7328 SdHoareTripleChecker+Valid, 29976 SdHoareTripleChecker+Invalid, 394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 187 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:28,259 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7328 Valid, 29976 Invalid, 394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 197 Invalid, 0 Unknown, 187 Unchecked, 0.3s Time] [2021-11-23 17:16:28,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1875 states. [2021-11-23 17:16:28,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1875 to 1869. [2021-11-23 17:16:28,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1869 states, 1867 states have (on average 1.5704338510980183) internal successors, (2932), 1868 states have internal predecessors, (2932), 0 states have call successors, (0), 0 states 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 17:16:28,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1869 states to 1869 states and 2932 transitions. [2021-11-23 17:16:28,316 INFO L78 Accepts]: Start accepts. Automaton has 1869 states and 2932 transitions. Word has length 67 [2021-11-23 17:16:28,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:28,316 INFO L470 AbstractCegarLoop]: Abstraction has 1869 states and 2932 transitions. [2021-11-23 17:16:28,317 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 3.392857142857143) internal successors, (190), 56 states have internal predecessors, (190), 0 states have call successors, (0), 0 states 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 17:16:28,317 INFO L276 IsEmpty]: Start isEmpty. Operand 1869 states and 2932 transitions. [2021-11-23 17:16:28,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 17:16:28,318 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:28,318 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:16:28,354 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2021-11-23 17:16:28,548 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Ended with exit code 0 [2021-11-23 17:16:28,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:28,940 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:28,941 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:28,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:28,941 INFO L85 PathProgramCache]: Analyzing trace with hash 138650479, now seen corresponding path program 1 times [2021-11-23 17:16:28,941 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:28,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1443143640] [2021-11-23 17:16:28,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:28,941 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:28,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:28,942 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:28,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-23 17:16:29,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:29,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:16:29,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:31,801 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:31,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:33,478 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:33,479 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:33,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1443143640] [2021-11-23 17:16:33,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1443143640] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:33,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1558768557] [2021-11-23 17:16:33,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:33,479 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:33,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:16:33,480 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:16:33,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-11-23 17:16:33,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:33,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:16:33,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:35,947 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:35,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:36,630 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:36,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1558768557] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:36,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107437980] [2021-11-23 17:16:36,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:36,631 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:16:36,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:16:36,632 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:16:36,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-23 17:16:36,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:36,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:16:36,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:40,042 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:40,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:41,379 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:41,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [107437980] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:41,380 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:16:41,380 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 20, 18, 18, 18] total 55 [2021-11-23 17:16:41,380 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012878691] [2021-11-23 17:16:41,380 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:16:41,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 17:16:41,381 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:41,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 17:16:41,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=2600, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:16:41,383 INFO L87 Difference]: Start difference. First operand 1869 states and 2932 transitions. Second operand has 55 states, 55 states have (on average 3.4909090909090907) internal successors, (192), 55 states have internal predecessors, (192), 0 states have call successors, (0), 0 states 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 17:16:42,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:42,238 INFO L93 Difference]: Finished difference Result 2100 states and 3231 transitions. [2021-11-23 17:16:42,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 17:16:42,239 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.4909090909090907) internal successors, (192), 55 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-23 17:16:42,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:42,243 INFO L225 Difference]: With dead ends: 2100 [2021-11-23 17:16:42,244 INFO L226 Difference]: Without dead ends: 1972 [2021-11-23 17:16:42,246 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 345 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1402 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=450, Invalid=2856, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 17:16:42,247 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 8828 mSDsluCounter, 28969 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8828 SdHoareTripleChecker+Valid, 30490 SdHoareTripleChecker+Invalid, 530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 321 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:42,247 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8828 Valid, 30490 Invalid, 530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 197 Invalid, 0 Unknown, 321 Unchecked, 0.3s Time] [2021-11-23 17:16:42,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1972 states. [2021-11-23 17:16:42,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1972 to 1855. [2021-11-23 17:16:42,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1855 states, 1853 states have (on average 1.5731246627091204) internal successors, (2915), 1854 states have internal predecessors, (2915), 0 states have call successors, (0), 0 states 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 17:16:42,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1855 states to 1855 states and 2915 transitions. [2021-11-23 17:16:42,298 INFO L78 Accepts]: Start accepts. Automaton has 1855 states and 2915 transitions. Word has length 67 [2021-11-23 17:16:42,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:42,298 INFO L470 AbstractCegarLoop]: Abstraction has 1855 states and 2915 transitions. [2021-11-23 17:16:42,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.4909090909090907) internal successors, (192), 55 states have internal predecessors, (192), 0 states have call successors, (0), 0 states 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 17:16:42,299 INFO L276 IsEmpty]: Start isEmpty. Operand 1855 states and 2915 transitions. [2021-11-23 17:16:42,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:16:42,300 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:42,300 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] [2021-11-23 17:16:42,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:42,536 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Ended with exit code 0 [2021-11-23 17:16:42,729 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (35)] Ended with exit code 0 [2021-11-23 17:16:42,928 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:42,929 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:42,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:42,929 INFO L85 PathProgramCache]: Analyzing trace with hash -14785480, now seen corresponding path program 1 times [2021-11-23 17:16:42,929 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:42,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2135901049] [2021-11-23 17:16:42,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:42,929 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:42,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:42,930 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:42,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-23 17:16:42,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:42,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:16:42,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:43,313 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:16:43,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:43,570 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:16:43,570 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:43,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2135901049] [2021-11-23 17:16:43,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2135901049] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:43,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1084437124] [2021-11-23 17:16:43,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:43,571 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:43,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:16:43,571 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:16:43,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-23 17:16:43,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:43,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:16:43,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:43,991 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:16:43,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:44,261 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:16:44,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1084437124] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:44,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966731316] [2021-11-23 17:16:44,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:44,262 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:16:44,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:16:44,264 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:16:44,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-23 17:16:44,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:44,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:16:44,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:44,615 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:16:44,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:44,841 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:16:44,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1966731316] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:44,841 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:16:44,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 6 [2021-11-23 17:16:44,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043258294] [2021-11-23 17:16:44,842 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:16:44,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:16:44,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:44,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:16:44,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:16:44,843 INFO L87 Difference]: Start difference. First operand 1855 states and 2915 transitions. Second operand has 6 states, 6 states have (on average 21.5) internal successors, (129), 6 states have internal predecessors, (129), 0 states have call successors, (0), 0 states 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 17:16:44,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:44,949 INFO L93 Difference]: Finished difference Result 2636 states and 3931 transitions. [2021-11-23 17:16:44,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:16:44,950 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.5) internal successors, (129), 6 states have internal predecessors, (129), 0 states have call successors, (0), 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 68 [2021-11-23 17:16:44,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:44,956 INFO L225 Difference]: With dead ends: 2636 [2021-11-23 17:16:44,956 INFO L226 Difference]: Without dead ends: 2354 [2021-11-23 17:16:44,958 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 395 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:16:44,958 INFO L933 BasicCegarLoop]: 1536 mSDtfsCounter, 1602 mSDsluCounter, 1659 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1602 SdHoareTripleChecker+Valid, 3195 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 7 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:44,959 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1602 Valid, 3195 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 22 Invalid, 0 Unknown, 7 Unchecked, 0.0s Time] [2021-11-23 17:16:44,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2354 states. [2021-11-23 17:16:45,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2354 to 2258. [2021-11-23 17:16:45,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2258 states, 2256 states have (on average 1.5208333333333333) internal successors, (3431), 2257 states have internal predecessors, (3431), 0 states have call successors, (0), 0 states 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 17:16:45,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2258 states to 2258 states and 3431 transitions. [2021-11-23 17:16:45,040 INFO L78 Accepts]: Start accepts. Automaton has 2258 states and 3431 transitions. Word has length 68 [2021-11-23 17:16:45,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:45,040 INFO L470 AbstractCegarLoop]: Abstraction has 2258 states and 3431 transitions. [2021-11-23 17:16:45,041 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.5) internal successors, (129), 6 states have internal predecessors, (129), 0 states have call successors, (0), 0 states 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 17:16:45,041 INFO L276 IsEmpty]: Start isEmpty. Operand 2258 states and 3431 transitions. [2021-11-23 17:16:45,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:16:45,042 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:45,042 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] [2021-11-23 17:16:45,056 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:45,278 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2021-11-23 17:16:45,457 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Ended with exit code 0 [2021-11-23 17:16:45,656 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:45,656 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:45,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:45,657 INFO L85 PathProgramCache]: Analyzing trace with hash -1574375839, now seen corresponding path program 1 times [2021-11-23 17:16:45,657 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:45,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [465254079] [2021-11-23 17:16:45,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:45,657 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:45,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:45,659 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:45,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-23 17:16:45,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:45,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:16:45,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:50,374 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 17:16:50,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:53,439 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 17:16:53,439 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:53,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [465254079] [2021-11-23 17:16:53,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [465254079] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:53,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1409630956] [2021-11-23 17:16:53,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:53,439 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:53,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:16:53,440 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:16:53,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-23 17:16:53,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:53,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:16:53,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:56,388 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 17:16:56,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:57,353 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 17:16:57,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1409630956] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:57,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [61095582] [2021-11-23 17:16:57,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:57,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:16:57,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:16:57,354 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:16:57,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-23 17:16:57,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:57,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:16:57,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:02,981 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 17:17:02,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:04,752 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 17:17:04,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [61095582] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:04,752 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:17:04,752 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18, 11, 9, 23, 20] total 68 [2021-11-23 17:17:04,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055321292] [2021-11-23 17:17:04,753 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:17:04,754 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-23 17:17:04,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:04,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-23 17:17:04,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=555, Invalid=4001, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 17:17:04,756 INFO L87 Difference]: Start difference. First operand 2258 states and 3431 transitions. Second operand has 68 states, 68 states have (on average 3.8529411764705883) internal successors, (262), 68 states have internal predecessors, (262), 0 states have call successors, (0), 0 states 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 17:17:05,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:05,937 INFO L93 Difference]: Finished difference Result 2519 states and 3769 transitions. [2021-11-23 17:17:05,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:17:05,937 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 3.8529411764705883) internal successors, (262), 68 states have internal predecessors, (262), 0 states have call successors, (0), 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 68 [2021-11-23 17:17:05,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:05,941 INFO L225 Difference]: With dead ends: 2519 [2021-11-23 17:17:05,941 INFO L226 Difference]: Without dead ends: 2285 [2021-11-23 17:17:05,943 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 337 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2135 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=614, Invalid=4216, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 17:17:05,944 INFO L933 BasicCegarLoop]: 1494 mSDtfsCounter, 20379 mSDsluCounter, 23949 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20379 SdHoareTripleChecker+Valid, 25443 SdHoareTripleChecker+Invalid, 401 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 137 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:05,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20379 Valid, 25443 Invalid, 401 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 243 Invalid, 0 Unknown, 137 Unchecked, 0.5s Time] [2021-11-23 17:17:05,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2285 states. [2021-11-23 17:17:06,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2285 to 2264. [2021-11-23 17:17:06,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2264 states, 2262 states have (on average 1.5198938992042441) internal successors, (3438), 2263 states have internal predecessors, (3438), 0 states have call successors, (0), 0 states 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 17:17:06,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2264 states to 2264 states and 3438 transitions. [2021-11-23 17:17:06,036 INFO L78 Accepts]: Start accepts. Automaton has 2264 states and 3438 transitions. Word has length 68 [2021-11-23 17:17:06,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:06,037 INFO L470 AbstractCegarLoop]: Abstraction has 2264 states and 3438 transitions. [2021-11-23 17:17:06,037 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 3.8529411764705883) internal successors, (262), 68 states have internal predecessors, (262), 0 states have call successors, (0), 0 states 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 17:17:06,037 INFO L276 IsEmpty]: Start isEmpty. Operand 2264 states and 3438 transitions. [2021-11-23 17:17:06,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:17:06,038 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:06,039 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:17:06,085 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:06,265 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (41)] Ended with exit code 0 [2021-11-23 17:17:06,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:06,664 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:17:06,665 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:06,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:06,665 INFO L85 PathProgramCache]: Analyzing trace with hash 1310661252, now seen corresponding path program 1 times [2021-11-23 17:17:06,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:06,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [330241393] [2021-11-23 17:17:06,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:06,666 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:06,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:06,667 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:06,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-23 17:17:06,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:06,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:17:06,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:10,152 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:10,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:12,561 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:12,561 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:12,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [330241393] [2021-11-23 17:17:12,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [330241393] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:12,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1226612639] [2021-11-23 17:17:12,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:12,562 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:12,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:12,564 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:12,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-23 17:17:12,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:12,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:17:12,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:15,556 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:15,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:17,555 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:17,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1226612639] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:17,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [999804937] [2021-11-23 17:17:17,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:17,556 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:17,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:17:17,556 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:17:17,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-23 17:17:17,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:17,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:17:17,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:21,256 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:21,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:22,644 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:22,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [999804937] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:22,644 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:17:22,644 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 22, 20, 16, 15] total 72 [2021-11-23 17:17:22,644 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528832670] [2021-11-23 17:17:22,644 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:17:22,645 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-23 17:17:22,645 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:22,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-23 17:17:22,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=696, Invalid=4416, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 17:17:22,647 INFO L87 Difference]: Start difference. First operand 2264 states and 3438 transitions. Second operand has 72 states, 72 states have (on average 3.375) internal successors, (243), 72 states have internal predecessors, (243), 0 states have call successors, (0), 0 states 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 17:17:24,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:24,344 INFO L93 Difference]: Finished difference Result 2704 states and 3983 transitions. [2021-11-23 17:17:24,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:17:24,345 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 3.375) internal successors, (243), 72 states have internal predecessors, (243), 0 states have call successors, (0), 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 68 [2021-11-23 17:17:24,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:24,349 INFO L225 Difference]: With dead ends: 2704 [2021-11-23 17:17:24,349 INFO L226 Difference]: Without dead ends: 2398 [2021-11-23 17:17:24,352 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 334 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2569 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=819, Invalid=4731, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 17:17:24,353 INFO L933 BasicCegarLoop]: 1524 mSDtfsCounter, 18920 mSDsluCounter, 27457 mSDsCounter, 0 mSdLazyCounter, 562 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18920 SdHoareTripleChecker+Valid, 28981 SdHoareTripleChecker+Invalid, 670 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 562 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 76 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:24,354 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18920 Valid, 28981 Invalid, 670 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [32 Valid, 562 Invalid, 0 Unknown, 76 Unchecked, 0.9s Time] [2021-11-23 17:17:24,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2398 states. [2021-11-23 17:17:24,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2398 to 2146. [2021-11-23 17:17:24,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2146 states, 2144 states have (on average 1.5307835820895523) internal successors, (3282), 2145 states have internal predecessors, (3282), 0 states have call successors, (0), 0 states 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 17:17:24,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2146 states to 2146 states and 3282 transitions. [2021-11-23 17:17:24,436 INFO L78 Accepts]: Start accepts. Automaton has 2146 states and 3282 transitions. Word has length 68 [2021-11-23 17:17:24,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:24,436 INFO L470 AbstractCegarLoop]: Abstraction has 2146 states and 3282 transitions. [2021-11-23 17:17:24,437 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 3.375) internal successors, (243), 72 states have internal predecessors, (243), 0 states have call successors, (0), 0 states 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 17:17:24,437 INFO L276 IsEmpty]: Start isEmpty. Operand 2146 states and 3282 transitions. [2021-11-23 17:17:24,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 17:17:24,438 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:24,438 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:17:24,444 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (44)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:24,649 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Ended with exit code 0 [2021-11-23 17:17:24,868 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:25,041 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:25,041 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:25,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:25,042 INFO L85 PathProgramCache]: Analyzing trace with hash 1846619806, now seen corresponding path program 1 times [2021-11-23 17:17:25,042 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:25,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1155508572] [2021-11-23 17:17:25,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:25,042 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:25,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:25,043 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:25,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-23 17:17:25,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:25,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:17:25,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:25,423 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 17:17:25,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:25,654 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 17:17:25,655 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:25,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1155508572] [2021-11-23 17:17:25,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1155508572] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:25,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1999575728] [2021-11-23 17:17:25,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:25,656 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:25,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:25,679 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:25,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (47)] Waiting until timeout for monitored process [2021-11-23 17:17:25,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:25,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:17:25,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:25,868 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:17:25,868 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:17:25,868 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1999575728] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:17:25,868 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:17:25,869 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 17:17:25,869 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67794659] [2021-11-23 17:17:25,869 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:17:25,869 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:17:25,869 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:25,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:17:25,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:17:25,870 INFO L87 Difference]: Start difference. First operand 2146 states and 3282 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:25,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:25,939 INFO L93 Difference]: Finished difference Result 2756 states and 4071 transitions. [2021-11-23 17:17:25,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:17:25,940 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-23 17:17:25,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:25,944 INFO L225 Difference]: With dead ends: 2756 [2021-11-23 17:17:25,945 INFO L226 Difference]: Without dead ends: 2239 [2021-11-23 17:17:25,946 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 199 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:17:25,947 INFO L933 BasicCegarLoop]: 1515 mSDtfsCounter, 1484 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1484 SdHoareTripleChecker+Valid, 1564 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:25,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1484 Valid, 1564 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:17:25,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2239 states. [2021-11-23 17:17:26,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2239 to 2101. [2021-11-23 17:17:26,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2101 states, 2099 states have (on average 1.5350166746069558) internal successors, (3222), 2100 states have internal predecessors, (3222), 0 states have call successors, (0), 0 states 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 17:17:26,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2101 states to 2101 states and 3222 transitions. [2021-11-23 17:17:26,020 INFO L78 Accepts]: Start accepts. Automaton has 2101 states and 3222 transitions. Word has length 69 [2021-11-23 17:17:26,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:26,020 INFO L470 AbstractCegarLoop]: Abstraction has 2101 states and 3222 transitions. [2021-11-23 17:17:26,021 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:26,021 INFO L276 IsEmpty]: Start isEmpty. Operand 2101 states and 3222 transitions. [2021-11-23 17:17:26,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 17:17:26,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:26,023 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] [2021-11-23 17:17:26,028 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (47)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:26,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:26,432 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:17:26,433 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:26,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:26,433 INFO L85 PathProgramCache]: Analyzing trace with hash 1362739138, now seen corresponding path program 1 times [2021-11-23 17:17:26,433 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:26,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1027406556] [2021-11-23 17:17:26,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:26,434 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:26,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:26,436 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:26,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 17:17:26,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:26,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:17:26,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:28,191 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 17:17:28,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:28,689 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 17:17:28,689 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:28,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1027406556] [2021-11-23 17:17:28,689 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1027406556] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:28,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1142103181] [2021-11-23 17:17:28,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:28,689 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:28,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:28,690 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:28,691 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2021-11-23 17:17:28,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:28,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:17:28,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:30,481 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 17:17:30,481 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:30,746 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 17:17:30,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1142103181] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:30,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1509068481] [2021-11-23 17:17:30,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:30,747 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:30,747 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:17:30,748 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:17:30,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-23 17:17:30,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:30,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:17:30,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:32,333 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 17:17:32,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:32,601 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 17:17:32,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1509068481] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:32,602 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:17:32,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 10, 9] total 18 [2021-11-23 17:17:32,602 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958474856] [2021-11-23 17:17:32,602 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:17:32,603 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:17:32,603 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:32,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:17:32,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:17:32,604 INFO L87 Difference]: Start difference. First operand 2101 states and 3222 transitions. Second operand has 18 states, 18 states have (on average 6.833333333333333) internal successors, (123), 18 states have internal predecessors, (123), 0 states have call successors, (0), 0 states 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 17:17:32,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:32,834 INFO L93 Difference]: Finished difference Result 2272 states and 3446 transitions. [2021-11-23 17:17:32,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:17:32,835 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 6.833333333333333) internal successors, (123), 18 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-23 17:17:32,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:32,837 INFO L225 Difference]: With dead ends: 2272 [2021-11-23 17:17:32,837 INFO L226 Difference]: Without dead ends: 2049 [2021-11-23 17:17:32,838 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 392 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:17:32,839 INFO L933 BasicCegarLoop]: 1507 mSDtfsCounter, 2915 mSDsluCounter, 9141 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2915 SdHoareTripleChecker+Valid, 10648 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 46 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:32,839 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2915 Valid, 10648 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 73 Invalid, 0 Unknown, 46 Unchecked, 0.1s Time] [2021-11-23 17:17:32,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2049 states. [2021-11-23 17:17:32,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2049 to 2038. [2021-11-23 17:17:32,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2038 states, 2036 states have (on average 1.5417485265225934) internal successors, (3139), 2037 states have internal predecessors, (3139), 0 states have call successors, (0), 0 states 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 17:17:32,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2038 states to 2038 states and 3139 transitions. [2021-11-23 17:17:32,908 INFO L78 Accepts]: Start accepts. Automaton has 2038 states and 3139 transitions. Word has length 69 [2021-11-23 17:17:32,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:32,908 INFO L470 AbstractCegarLoop]: Abstraction has 2038 states and 3139 transitions. [2021-11-23 17:17:32,908 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 6.833333333333333) internal successors, (123), 18 states have internal predecessors, (123), 0 states have call successors, (0), 0 states 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 17:17:32,909 INFO L276 IsEmpty]: Start isEmpty. Operand 2038 states and 3139 transitions. [2021-11-23 17:17:32,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:17:32,910 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:32,910 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:17:32,923 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:33,124 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:33,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:33,523 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:33,523 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:33,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:33,524 INFO L85 PathProgramCache]: Analyzing trace with hash 1940957519, now seen corresponding path program 1 times [2021-11-23 17:17:33,524 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:33,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [807985282] [2021-11-23 17:17:33,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:33,524 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:33,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:33,525 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:33,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-23 17:17:33,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:33,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:17:33,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:36,294 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:36,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:37,190 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:37,190 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:37,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [807985282] [2021-11-23 17:17:37,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [807985282] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:37,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [81550291] [2021-11-23 17:17:37,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:37,191 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:37,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:37,192 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:37,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2021-11-23 17:17:37,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:37,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:17:37,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:39,669 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:39,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:40,333 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:40,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [81550291] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:40,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1670263049] [2021-11-23 17:17:40,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:40,334 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:40,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:17:40,335 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:17:40,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-23 17:17:40,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:40,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:17:40,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:42,281 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:17:42,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:43,287 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:17:43,288 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1670263049] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:43,288 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:17:43,289 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:17:43,289 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67366321] [2021-11-23 17:17:43,289 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:17:43,290 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:17:43,290 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:43,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:17:43,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:17:43,292 INFO L87 Difference]: Start difference. First operand 2038 states and 3139 transitions. Second operand has 34 states, 34 states have (on average 9.970588235294118) internal successors, (339), 33 states have internal predecessors, (339), 0 states have call successors, (0), 0 states 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 17:17:44,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:44,188 INFO L93 Difference]: Finished difference Result 2487 states and 3714 transitions. [2021-11-23 17:17:44,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:17:44,189 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 9.970588235294118) internal successors, (339), 33 states have internal predecessors, (339), 0 states have call successors, (0), 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 111 [2021-11-23 17:17:44,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:44,191 INFO L225 Difference]: With dead ends: 2487 [2021-11-23 17:17:44,191 INFO L226 Difference]: Without dead ends: 2072 [2021-11-23 17:17:44,193 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 673 GetRequests, 631 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=243, Invalid=1649, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:17:44,194 INFO L933 BasicCegarLoop]: 1514 mSDtfsCounter, 8773 mSDsluCounter, 25751 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8773 SdHoareTripleChecker+Valid, 27265 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 124 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:44,194 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8773 Valid, 27265 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 47 Invalid, 0 Unknown, 124 Unchecked, 0.1s Time] [2021-11-23 17:17:44,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2072 states. [2021-11-23 17:17:44,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2072 to 2072. [2021-11-23 17:17:44,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2072 states, 2070 states have (on average 1.5342995169082125) internal successors, (3176), 2071 states have internal predecessors, (3176), 0 states have call successors, (0), 0 states 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 17:17:44,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2072 states to 2072 states and 3176 transitions. [2021-11-23 17:17:44,253 INFO L78 Accepts]: Start accepts. Automaton has 2072 states and 3176 transitions. Word has length 111 [2021-11-23 17:17:44,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:44,254 INFO L470 AbstractCegarLoop]: Abstraction has 2072 states and 3176 transitions. [2021-11-23 17:17:44,254 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 9.970588235294118) internal successors, (339), 33 states have internal predecessors, (339), 0 states have call successors, (0), 0 states 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 17:17:44,254 INFO L276 IsEmpty]: Start isEmpty. Operand 2072 states and 3176 transitions. [2021-11-23 17:17:44,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:17:44,256 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:44,256 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:17:44,299 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:44,477 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Ended with exit code 0 [2021-11-23 17:17:44,686 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Ended with exit code 0 [2021-11-23 17:17:44,876 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:17:44,877 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:44,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:44,877 INFO L85 PathProgramCache]: Analyzing trace with hash -721276639, now seen corresponding path program 1 times [2021-11-23 17:17:44,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:44,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1128874685] [2021-11-23 17:17:44,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:44,878 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:44,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:44,880 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:44,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-23 17:17:44,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:44,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:17:44,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:47,760 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:47,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:48,826 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:48,826 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:48,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1128874685] [2021-11-23 17:17:48,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1128874685] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:48,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [529956579] [2021-11-23 17:17:48,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:48,827 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:48,827 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:48,828 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:48,829 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-11-23 17:17:48,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:48,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:17:48,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:51,195 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:51,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:51,853 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:51,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [529956579] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:51,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47763954] [2021-11-23 17:17:51,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:51,853 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:51,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:17:51,854 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:17:51,855 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-23 17:17:51,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:51,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:17:51,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:54,451 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 65 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:17:54,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:55,175 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 65 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:17:55,175 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47763954] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:55,176 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:17:55,176 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:17:55,176 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266165081] [2021-11-23 17:17:55,176 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:17:55,177 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:17:55,178 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:55,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:17:55,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:17:55,179 INFO L87 Difference]: Start difference. First operand 2072 states and 3176 transitions. Second operand has 34 states, 34 states have (on average 10.264705882352942) internal successors, (349), 33 states have internal predecessors, (349), 0 states have call successors, (0), 0 states 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 17:17:56,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:56,185 INFO L93 Difference]: Finished difference Result 2571 states and 3807 transitions. [2021-11-23 17:17:56,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:17:56,185 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 10.264705882352942) internal successors, (349), 33 states have internal predecessors, (349), 0 states have call successors, (0), 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 111 [2021-11-23 17:17:56,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:56,188 INFO L225 Difference]: With dead ends: 2571 [2021-11-23 17:17:56,188 INFO L226 Difference]: Without dead ends: 2162 [2021-11-23 17:17:56,190 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 673 GetRequests, 630 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=274, Invalid=1706, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:17:56,191 INFO L933 BasicCegarLoop]: 1518 mSDtfsCounter, 11660 mSDsluCounter, 25854 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11660 SdHoareTripleChecker+Valid, 27372 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 158 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:56,191 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11660 Valid, 27372 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 56 Invalid, 0 Unknown, 158 Unchecked, 0.1s Time] [2021-11-23 17:17:56,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2162 states. [2021-11-23 17:17:56,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2162 to 2162. [2021-11-23 17:17:56,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2162 states, 2160 states have (on average 1.5171296296296297) internal successors, (3277), 2161 states have internal predecessors, (3277), 0 states have call successors, (0), 0 states 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 17:17:56,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2162 states to 2162 states and 3277 transitions. [2021-11-23 17:17:56,254 INFO L78 Accepts]: Start accepts. Automaton has 2162 states and 3277 transitions. Word has length 111 [2021-11-23 17:17:56,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:56,254 INFO L470 AbstractCegarLoop]: Abstraction has 2162 states and 3277 transitions. [2021-11-23 17:17:56,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 10.264705882352942) internal successors, (349), 33 states have internal predecessors, (349), 0 states have call successors, (0), 0 states 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 17:17:56,255 INFO L276 IsEmpty]: Start isEmpty. Operand 2162 states and 3277 transitions. [2021-11-23 17:17:56,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:17:56,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:56,257 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:17:56,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:56,473 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Ended with exit code 0 [2021-11-23 17:17:56,695 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:56,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:56,873 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:56,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:56,873 INFO L85 PathProgramCache]: Analyzing trace with hash 1804907841, now seen corresponding path program 1 times [2021-11-23 17:17:56,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:56,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [917222414] [2021-11-23 17:17:56,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:56,874 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:56,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:56,875 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:56,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 17:17:56,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:56,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:17:56,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:00,089 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:00,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:00,975 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:00,975 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:00,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [917222414] [2021-11-23 17:18:00,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [917222414] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:00,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [853499600] [2021-11-23 17:18:00,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:00,976 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:00,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:00,977 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:00,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2021-11-23 17:18:01,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:01,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:18:01,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:03,779 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:03,779 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:04,258 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:04,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [853499600] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:04,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [485885397] [2021-11-23 17:18:04,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:04,259 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:04,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:04,268 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:04,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-23 17:18:04,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:04,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:18:04,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:06,611 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 72 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:18:06,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:07,554 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 72 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:18:07,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [485885397] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:07,554 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:07,554 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:18:07,554 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340119697] [2021-11-23 17:18:07,555 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:07,555 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:18:07,555 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:07,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:18:07,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:18:07,557 INFO L87 Difference]: Start difference. First operand 2162 states and 3277 transitions. Second operand has 34 states, 34 states have (on average 10.705882352941176) internal successors, (364), 33 states have internal predecessors, (364), 0 states have call successors, (0), 0 states 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 17:18:08,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:08,477 INFO L93 Difference]: Finished difference Result 2747 states and 4005 transitions. [2021-11-23 17:18:08,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:18:08,477 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 10.705882352941176) internal successors, (364), 33 states have internal predecessors, (364), 0 states have call successors, (0), 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 111 [2021-11-23 17:18:08,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:08,480 INFO L225 Difference]: With dead ends: 2747 [2021-11-23 17:18:08,480 INFO L226 Difference]: Without dead ends: 2350 [2021-11-23 17:18:08,482 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 673 GetRequests, 631 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=258, Invalid=1634, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:18:08,482 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 14558 mSDsluCounter, 18636 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14558 SdHoareTripleChecker+Valid, 20157 SdHoareTripleChecker+Invalid, 253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 189 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:08,482 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14558 Valid, 20157 Invalid, 253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 56 Invalid, 0 Unknown, 189 Unchecked, 0.1s Time] [2021-11-23 17:18:08,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2350 states. [2021-11-23 17:18:08,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2350 to 2350. [2021-11-23 17:18:08,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2350 states, 2348 states have (on average 1.4867972742759796) internal successors, (3491), 2349 states have internal predecessors, (3491), 0 states have call successors, (0), 0 states 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 17:18:08,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2350 states to 2350 states and 3491 transitions. [2021-11-23 17:18:08,564 INFO L78 Accepts]: Start accepts. Automaton has 2350 states and 3491 transitions. Word has length 111 [2021-11-23 17:18:08,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:08,565 INFO L470 AbstractCegarLoop]: Abstraction has 2350 states and 3491 transitions. [2021-11-23 17:18:08,565 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 10.705882352941176) internal successors, (364), 33 states have internal predecessors, (364), 0 states have call successors, (0), 0 states 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 17:18:08,565 INFO L276 IsEmpty]: Start isEmpty. Operand 2350 states and 3491 transitions. [2021-11-23 17:18:08,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:18:08,566 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:08,567 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 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] [2021-11-23 17:18:08,576 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:08,773 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:08,992 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:09,168 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:09,169 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:09,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:09,169 INFO L85 PathProgramCache]: Analyzing trace with hash 1868570961, now seen corresponding path program 1 times [2021-11-23 17:18:09,170 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:09,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1654282706] [2021-11-23 17:18:09,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:09,170 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:09,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:09,172 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:09,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-23 17:18:09,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:09,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:18:09,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:11,482 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 58 proven. 32 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:18:11,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:12,381 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 58 proven. 32 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:18:12,382 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:12,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1654282706] [2021-11-23 17:18:12,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1654282706] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:12,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [100703114] [2021-11-23 17:18:12,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:12,383 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:12,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:12,391 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:12,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2021-11-23 17:18:12,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:12,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:18:12,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:16,175 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:16,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:17,440 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:17,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [100703114] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:17,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [227167119] [2021-11-23 17:18:17,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:17,441 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:17,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:17,446 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:17,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-23 17:18:17,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:17,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:18:17,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:20,177 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 64 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:18:20,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:21,066 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 64 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:18:21,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [227167119] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:21,066 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:21,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:18:21,067 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540737135] [2021-11-23 17:18:21,067 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:21,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:18:21,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:21,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:18:21,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:18:21,071 INFO L87 Difference]: Start difference. First operand 2350 states and 3491 transitions. Second operand has 48 states, 48 states have (on average 10.395833333333334) internal successors, (499), 47 states have internal predecessors, (499), 0 states have call successors, (0), 0 states 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 17:18:23,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:23,530 INFO L93 Difference]: Finished difference Result 2916 states and 4211 transitions. [2021-11-23 17:18:23,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 17:18:23,530 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 10.395833333333334) internal successors, (499), 47 states have internal predecessors, (499), 0 states have call successors, (0), 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 111 [2021-11-23 17:18:23,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:23,533 INFO L225 Difference]: With dead ends: 2916 [2021-11-23 17:18:23,533 INFO L226 Difference]: Without dead ends: 2464 [2021-11-23 17:18:23,535 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 689 GetRequests, 621 SyntacticMatches, 3 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1103 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=424, Invalid=3998, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 17:18:23,536 INFO L933 BasicCegarLoop]: 1518 mSDtfsCounter, 10220 mSDsluCounter, 36384 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10220 SdHoareTripleChecker+Valid, 37902 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 200 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:23,536 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10220 Valid, 37902 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 80 Invalid, 0 Unknown, 200 Unchecked, 0.1s Time] [2021-11-23 17:18:23,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2464 states. [2021-11-23 17:18:23,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2464 to 2456. [2021-11-23 17:18:23,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2456 states, 2454 states have (on average 1.4731051344743276) internal successors, (3615), 2455 states have internal predecessors, (3615), 0 states have call successors, (0), 0 states 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 17:18:23,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2456 states to 2456 states and 3615 transitions. [2021-11-23 17:18:23,605 INFO L78 Accepts]: Start accepts. Automaton has 2456 states and 3615 transitions. Word has length 111 [2021-11-23 17:18:23,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:23,606 INFO L470 AbstractCegarLoop]: Abstraction has 2456 states and 3615 transitions. [2021-11-23 17:18:23,606 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 10.395833333333334) internal successors, (499), 47 states have internal predecessors, (499), 0 states have call successors, (0), 0 states 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 17:18:23,606 INFO L276 IsEmpty]: Start isEmpty. Operand 2456 states and 3615 transitions. [2021-11-23 17:18:23,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:18:23,608 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:23,609 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 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] [2021-11-23 17:18:23,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:23,835 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2021-11-23 17:18:24,022 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:24,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:24,211 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:24,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:24,212 INFO L85 PathProgramCache]: Analyzing trace with hash -1694478255, now seen corresponding path program 1 times [2021-11-23 17:18:24,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:24,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [118051748] [2021-11-23 17:18:24,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:24,213 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:24,213 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:24,214 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:24,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2021-11-23 17:18:24,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:24,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:18:24,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:26,497 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 62 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:18:26,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:27,253 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 62 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:18:27,253 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:27,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [118051748] [2021-11-23 17:18:27,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [118051748] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:27,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [593027902] [2021-11-23 17:18:27,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:27,254 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:27,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:27,256 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:27,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Waiting until timeout for monitored process [2021-11-23 17:18:27,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:27,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:18:27,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:31,340 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:31,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:32,530 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:32,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [593027902] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:32,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796299576] [2021-11-23 17:18:32,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:32,530 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:32,531 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:32,536 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:32,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-23 17:18:32,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:32,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:18:32,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:34,922 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:18:34,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:35,952 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:18:35,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [796299576] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:35,953 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:35,953 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:18:35,953 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258326391] [2021-11-23 17:18:35,953 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:35,954 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:18:35,954 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:35,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:18:35,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:18:35,956 INFO L87 Difference]: Start difference. First operand 2456 states and 3615 transitions. Second operand has 48 states, 48 states have (on average 10.25) internal successors, (492), 47 states have internal predecessors, (492), 0 states have call successors, (0), 0 states 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 17:18:38,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:38,092 INFO L93 Difference]: Finished difference Result 3035 states and 4352 transitions. [2021-11-23 17:18:38,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:18:38,093 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 10.25) internal successors, (492), 47 states have internal predecessors, (492), 0 states have call successors, (0), 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 111 [2021-11-23 17:18:38,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:38,096 INFO L225 Difference]: With dead ends: 3035 [2021-11-23 17:18:38,096 INFO L226 Difference]: Without dead ends: 2579 [2021-11-23 17:18:38,099 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 688 GetRequests, 622 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=396, Invalid=3764, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 17:18:38,100 INFO L933 BasicCegarLoop]: 1517 mSDtfsCounter, 8809 mSDsluCounter, 36541 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8809 SdHoareTripleChecker+Valid, 38058 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 160 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:38,100 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8809 Valid, 38058 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 91 Invalid, 0 Unknown, 160 Unchecked, 0.1s Time] [2021-11-23 17:18:38,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2579 states. [2021-11-23 17:18:38,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2579 to 2575. [2021-11-23 17:18:38,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2575 states, 2573 states have (on average 1.4593859308200545) internal successors, (3755), 2574 states have internal predecessors, (3755), 0 states have call successors, (0), 0 states 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 17:18:38,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2575 states to 2575 states and 3755 transitions. [2021-11-23 17:18:38,179 INFO L78 Accepts]: Start accepts. Automaton has 2575 states and 3755 transitions. Word has length 111 [2021-11-23 17:18:38,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:38,179 INFO L470 AbstractCegarLoop]: Abstraction has 2575 states and 3755 transitions. [2021-11-23 17:18:38,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 10.25) internal successors, (492), 47 states have internal predecessors, (492), 0 states have call successors, (0), 0 states 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 17:18:38,179 INFO L276 IsEmpty]: Start isEmpty. Operand 2575 states and 3755 transitions. [2021-11-23 17:18:38,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:18:38,180 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:38,181 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 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] [2021-11-23 17:18:38,190 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:38,406 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Ended with exit code 0 [2021-11-23 17:18:38,589 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Ended with exit code 0 [2021-11-23 17:18:38,787 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:38,788 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:38,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:38,788 INFO L85 PathProgramCache]: Analyzing trace with hash -1930363055, now seen corresponding path program 1 times [2021-11-23 17:18:38,788 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:38,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1575540643] [2021-11-23 17:18:38,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:38,789 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:38,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:38,790 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:38,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Waiting until timeout for monitored process [2021-11-23 17:18:38,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:38,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:18:38,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:40,681 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 66 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:18:40,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:41,604 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 66 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:18:41,604 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:41,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1575540643] [2021-11-23 17:18:41,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1575540643] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:41,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [98800735] [2021-11-23 17:18:41,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:41,604 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:41,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:41,605 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:41,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Waiting until timeout for monitored process [2021-11-23 17:18:41,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:41,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:18:41,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:44,043 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:44,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:44,926 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:44,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [98800735] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:44,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [854859926] [2021-11-23 17:18:44,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:44,926 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:44,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:44,927 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:44,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-23 17:18:44,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:45,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:18:45,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:46,859 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:18:46,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:47,935 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:18:47,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [854859926] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:47,935 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:47,936 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 17:18:47,936 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49703475] [2021-11-23 17:18:47,936 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:47,937 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 17:18:47,937 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:47,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 17:18:47,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 17:18:47,938 INFO L87 Difference]: Start difference. First operand 2575 states and 3755 transitions. Second operand has 39 states, 39 states have (on average 11.0) internal successors, (429), 38 states have internal predecessors, (429), 0 states have call successors, (0), 0 states 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 17:18:49,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:49,589 INFO L93 Difference]: Finished difference Result 3062 states and 4380 transitions. [2021-11-23 17:18:49,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:18:49,590 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 11.0) internal successors, (429), 38 states have internal predecessors, (429), 0 states have call successors, (0), 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 111 [2021-11-23 17:18:49,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:49,592 INFO L225 Difference]: With dead ends: 3062 [2021-11-23 17:18:49,592 INFO L226 Difference]: Without dead ends: 2602 [2021-11-23 17:18:49,594 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 627 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=360, Invalid=2610, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:18:49,594 INFO L933 BasicCegarLoop]: 1505 mSDtfsCounter, 10297 mSDsluCounter, 28553 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10297 SdHoareTripleChecker+Valid, 30058 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 139 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:49,595 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10297 Valid, 30058 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 70 Invalid, 0 Unknown, 139 Unchecked, 0.1s Time] [2021-11-23 17:18:49,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2602 states. [2021-11-23 17:18:49,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2602 to 2600. [2021-11-23 17:18:49,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2600 states, 2598 states have (on average 1.4534257120862202) internal successors, (3776), 2599 states have internal predecessors, (3776), 0 states have call successors, (0), 0 states 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 17:18:49,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2600 states to 2600 states and 3776 transitions. [2021-11-23 17:18:49,673 INFO L78 Accepts]: Start accepts. Automaton has 2600 states and 3776 transitions. Word has length 111 [2021-11-23 17:18:49,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:49,674 INFO L470 AbstractCegarLoop]: Abstraction has 2600 states and 3776 transitions. [2021-11-23 17:18:49,674 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 11.0) internal successors, (429), 38 states have internal predecessors, (429), 0 states have call successors, (0), 0 states 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 17:18:49,674 INFO L276 IsEmpty]: Start isEmpty. Operand 2600 states and 3776 transitions. [2021-11-23 17:18:49,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:18:49,675 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:49,675 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:18:49,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:49,898 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:50,085 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Ended with exit code 0 [2021-11-23 17:18:50,276 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:50,276 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:50,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:50,277 INFO L85 PathProgramCache]: Analyzing trace with hash 1699429479, now seen corresponding path program 1 times [2021-11-23 17:18:50,277 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:50,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1183880348] [2021-11-23 17:18:50,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:50,277 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:50,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:50,278 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:50,279 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2021-11-23 17:18:50,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:50,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:18:50,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:57,075 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:57,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:00,013 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:00,014 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:00,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1183880348] [2021-11-23 17:19:00,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1183880348] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:00,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [480543568] [2021-11-23 17:19:00,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:00,014 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:00,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:00,015 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:00,016 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Waiting until timeout for monitored process [2021-11-23 17:19:00,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:00,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-23 17:19:00,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:06,220 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 61 proven. 6 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:19:06,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:10,207 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:10,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [480543568] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:10,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1219174291] [2021-11-23 17:19:10,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:10,208 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:10,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:19:10,208 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:19:10,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-23 17:19:10,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:10,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:19:10,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:18,284 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:18,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:21,254 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:21,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1219174291] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:21,254 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:19:21,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20, 22, 24, 18, 17] total 100 [2021-11-23 17:19:21,254 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553607831] [2021-11-23 17:19:21,254 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:19:21,255 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2021-11-23 17:19:21,255 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:21,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-11-23 17:19:21,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=930, Invalid=8970, Unknown=0, NotChecked=0, Total=9900 [2021-11-23 17:19:21,257 INFO L87 Difference]: Start difference. First operand 2600 states and 3776 transitions. Second operand has 100 states, 100 states have (on average 5.2) internal successors, (520), 100 states have internal predecessors, (520), 0 states have call successors, (0), 0 states 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 17:19:26,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:26,290 INFO L93 Difference]: Finished difference Result 3260 states and 4583 transitions. [2021-11-23 17:19:26,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 17:19:26,292 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 5.2) internal successors, (520), 100 states have internal predecessors, (520), 0 states have call successors, (0), 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 112 [2021-11-23 17:19:26,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:26,296 INFO L225 Difference]: With dead ends: 3260 [2021-11-23 17:19:26,296 INFO L226 Difference]: Without dead ends: 2586 [2021-11-23 17:19:26,299 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 694 GetRequests, 576 SyntacticMatches, 3 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5001 ImplicationChecksByTransitivity, 19.6s TimeCoverageRelationStatistics Valid=1393, Invalid=12179, Unknown=0, NotChecked=0, Total=13572 [2021-11-23 17:19:26,299 INFO L933 BasicCegarLoop]: 1497 mSDtfsCounter, 20414 mSDsluCounter, 53799 mSDsCounter, 0 mSdLazyCounter, 423 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20414 SdHoareTripleChecker+Valid, 55296 SdHoareTripleChecker+Invalid, 636 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 423 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 179 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:26,300 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20414 Valid, 55296 Invalid, 636 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [34 Valid, 423 Invalid, 0 Unknown, 179 Unchecked, 0.8s Time] [2021-11-23 17:19:26,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2586 states. [2021-11-23 17:19:26,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2586 to 2520. [2021-11-23 17:19:26,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2520 states, 2518 states have (on average 1.4646544876886418) internal successors, (3688), 2519 states have internal predecessors, (3688), 0 states have call successors, (0), 0 states 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 17:19:26,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2520 states to 2520 states and 3688 transitions. [2021-11-23 17:19:26,429 INFO L78 Accepts]: Start accepts. Automaton has 2520 states and 3688 transitions. Word has length 112 [2021-11-23 17:19:26,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:26,429 INFO L470 AbstractCegarLoop]: Abstraction has 2520 states and 3688 transitions. [2021-11-23 17:19:26,429 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 100 states have (on average 5.2) internal successors, (520), 100 states have internal predecessors, (520), 0 states have call successors, (0), 0 states 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 17:19:26,429 INFO L276 IsEmpty]: Start isEmpty. Operand 2520 states and 3688 transitions. [2021-11-23 17:19:26,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:19:26,431 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:26,431 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:19:26,436 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:26,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:26,842 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Ended with exit code 0 [2021-11-23 17:19:27,031 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:19:27,032 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:27,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:27,032 INFO L85 PathProgramCache]: Analyzing trace with hash -510823495, now seen corresponding path program 1 times [2021-11-23 17:19:27,033 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:27,033 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [7182691] [2021-11-23 17:19:27,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:27,033 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:27,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:27,034 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:27,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Waiting until timeout for monitored process [2021-11-23 17:19:27,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:27,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:19:27,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:28,636 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:19:28,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:29,567 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:19:29,567 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:29,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [7182691] [2021-11-23 17:19:29,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [7182691] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:29,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1714458829] [2021-11-23 17:19:29,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:29,568 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:29,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:29,569 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:29,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Waiting until timeout for monitored process [2021-11-23 17:19:29,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:29,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:19:29,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:31,042 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:19:31,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:31,680 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:19:31,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1714458829] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:31,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [179629663] [2021-11-23 17:19:31,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:31,681 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:31,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:19:31,682 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:19:31,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2021-11-23 17:19:31,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:31,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:19:31,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:33,076 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:19:33,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:33,773 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:19:33,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [179629663] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:33,773 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:19:33,774 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:19:33,774 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309052467] [2021-11-23 17:19:33,775 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:19:33,775 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:19:33,775 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:33,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:19:33,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:19:33,776 INFO L87 Difference]: Start difference. First operand 2520 states and 3688 transitions. Second operand has 16 states, 16 states have (on average 10.0625) internal successors, (161), 15 states have internal predecessors, (161), 0 states have call successors, (0), 0 states 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 17:19:34,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:34,309 INFO L93 Difference]: Finished difference Result 3464 states and 4895 transitions. [2021-11-23 17:19:34,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:19:34,310 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.0625) internal successors, (161), 15 states have internal predecessors, (161), 0 states have call successors, (0), 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 112 [2021-11-23 17:19:34,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:34,314 INFO L225 Difference]: With dead ends: 3464 [2021-11-23 17:19:34,314 INFO L226 Difference]: Without dead ends: 3027 [2021-11-23 17:19:34,315 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 676 GetRequests, 654 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:19:34,316 INFO L933 BasicCegarLoop]: 1515 mSDtfsCounter, 4425 mSDsluCounter, 12097 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4425 SdHoareTripleChecker+Valid, 13612 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 74 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:34,316 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4425 Valid, 13612 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 29 Invalid, 0 Unknown, 74 Unchecked, 0.1s Time] [2021-11-23 17:19:34,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3027 states. [2021-11-23 17:19:34,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3027 to 3005. [2021-11-23 17:19:34,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3005 states, 3003 states have (on average 1.4332334332334333) internal successors, (4304), 3004 states have internal predecessors, (4304), 0 states have call successors, (0), 0 states 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 17:19:34,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3005 states to 3005 states and 4304 transitions. [2021-11-23 17:19:34,438 INFO L78 Accepts]: Start accepts. Automaton has 3005 states and 4304 transitions. Word has length 112 [2021-11-23 17:19:34,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:34,438 INFO L470 AbstractCegarLoop]: Abstraction has 3005 states and 4304 transitions. [2021-11-23 17:19:34,439 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.0625) internal successors, (161), 15 states have internal predecessors, (161), 0 states have call successors, (0), 0 states 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 17:19:34,439 INFO L276 IsEmpty]: Start isEmpty. Operand 3005 states and 4304 transitions. [2021-11-23 17:19:34,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:19:34,440 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:34,441 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:19:34,466 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:34,649 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:34,843 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Ended with exit code 0 [2021-11-23 17:19:35,041 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:35,042 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:35,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:35,042 INFO L85 PathProgramCache]: Analyzing trace with hash -1336782839, now seen corresponding path program 1 times [2021-11-23 17:19:35,042 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:35,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [92116620] [2021-11-23 17:19:35,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:35,043 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:35,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:35,044 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:35,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Waiting until timeout for monitored process [2021-11-23 17:19:35,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:35,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:19:35,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:36,207 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 84 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 17:19:36,207 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:19:36,208 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:36,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [92116620] [2021-11-23 17:19:36,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [92116620] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:19:36,208 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:19:36,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:19:36,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50730020] [2021-11-23 17:19:36,209 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:19:36,209 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:19:36,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:36,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:19:36,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:19:36,210 INFO L87 Difference]: Start difference. First operand 3005 states and 4304 transitions. Second operand has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 5 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:36,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:36,381 INFO L93 Difference]: Finished difference Result 3477 states and 4909 transitions. [2021-11-23 17:19:36,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:19:36,381 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 5 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-23 17:19:36,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:36,385 INFO L225 Difference]: With dead ends: 3477 [2021-11-23 17:19:36,385 INFO L226 Difference]: Without dead ends: 3025 [2021-11-23 17:19:36,386 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:19:36,387 INFO L933 BasicCegarLoop]: 1514 mSDtfsCounter, 1497 mSDsluCounter, 3040 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1497 SdHoareTripleChecker+Valid, 4554 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 42 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:36,387 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1497 Valid, 4554 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 42 Unchecked, 0.0s Time] [2021-11-23 17:19:36,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3025 states. [2021-11-23 17:19:36,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3025 to 3005. [2021-11-23 17:19:36,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3005 states, 3003 states have (on average 1.4285714285714286) internal successors, (4290), 3004 states have internal predecessors, (4290), 0 states have call successors, (0), 0 states 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 17:19:36,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3005 states to 3005 states and 4290 transitions. [2021-11-23 17:19:36,493 INFO L78 Accepts]: Start accepts. Automaton has 3005 states and 4290 transitions. Word has length 112 [2021-11-23 17:19:36,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:36,493 INFO L470 AbstractCegarLoop]: Abstraction has 3005 states and 4290 transitions. [2021-11-23 17:19:36,493 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 5 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:36,493 INFO L276 IsEmpty]: Start isEmpty. Operand 3005 states and 4290 transitions. [2021-11-23 17:19:36,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:19:36,495 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:36,495 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:19:36,504 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:36,700 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:19:36,700 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:36,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:36,701 INFO L85 PathProgramCache]: Analyzing trace with hash -604864759, now seen corresponding path program 1 times [2021-11-23 17:19:36,701 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:36,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [3019771] [2021-11-23 17:19:36,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:36,702 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:36,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:36,703 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:36,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (76)] Waiting until timeout for monitored process [2021-11-23 17:19:36,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:36,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:19:36,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:39,049 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 63 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:19:39,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:39,776 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 63 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:19:39,776 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:39,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [3019771] [2021-11-23 17:19:39,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [3019771] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:39,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [124650608] [2021-11-23 17:19:39,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:39,777 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:39,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:39,779 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:39,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (77)] Waiting until timeout for monitored process [2021-11-23 17:19:39,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:39,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:19:39,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:41,673 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:19:41,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:42,571 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:19:42,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [124650608] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:42,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096260209] [2021-11-23 17:19:42,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:42,572 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:42,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:19:42,573 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:19:42,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2021-11-23 17:19:42,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:42,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:19:42,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:43,936 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:19:43,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:44,643 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:19:44,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2096260209] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:44,643 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:19:44,643 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:19:44,644 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823615562] [2021-11-23 17:19:44,644 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:19:44,645 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:19:44,645 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:44,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:19:44,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:19:44,646 INFO L87 Difference]: Start difference. First operand 3005 states and 4290 transitions. Second operand has 32 states, 32 states have (on average 9.9375) internal successors, (318), 31 states have internal predecessors, (318), 0 states have call successors, (0), 0 states 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 17:19:46,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:46,475 INFO L93 Difference]: Finished difference Result 4105 states and 5694 transitions. [2021-11-23 17:19:46,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:19:46,476 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 9.9375) internal successors, (318), 31 states have internal predecessors, (318), 0 states have call successors, (0), 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 112 [2021-11-23 17:19:46,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:46,479 INFO L225 Difference]: With dead ends: 4105 [2021-11-23 17:19:46,479 INFO L226 Difference]: Without dead ends: 3649 [2021-11-23 17:19:46,481 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 693 GetRequests, 641 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=300, Invalid=2352, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 17:19:46,481 INFO L933 BasicCegarLoop]: 1525 mSDtfsCounter, 7390 mSDsluCounter, 25923 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7390 SdHoareTripleChecker+Valid, 27448 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 133 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:46,481 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7390 Valid, 27448 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 64 Invalid, 0 Unknown, 133 Unchecked, 0.1s Time] [2021-11-23 17:19:46,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3649 states. [2021-11-23 17:19:46,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3649 to 3633. [2021-11-23 17:19:46,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3633 states, 3631 states have (on average 1.3998898375103277) internal successors, (5083), 3632 states have internal predecessors, (5083), 0 states have call successors, (0), 0 states 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 17:19:46,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3633 states to 3633 states and 5083 transitions. [2021-11-23 17:19:46,672 INFO L78 Accepts]: Start accepts. Automaton has 3633 states and 5083 transitions. Word has length 112 [2021-11-23 17:19:46,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:46,672 INFO L470 AbstractCegarLoop]: Abstraction has 3633 states and 5083 transitions. [2021-11-23 17:19:46,672 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 9.9375) internal successors, (318), 31 states have internal predecessors, (318), 0 states have call successors, (0), 0 states 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 17:19:46,673 INFO L276 IsEmpty]: Start isEmpty. Operand 3633 states and 5083 transitions. [2021-11-23 17:19:46,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:19:46,674 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:46,674 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:19:46,676 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (77)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:46,883 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (76)] Ended with exit code 0 [2021-11-23 17:19:47,097 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Ended with exit code 0 [2021-11-23 17:19:47,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:47,275 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:47,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:47,276 INFO L85 PathProgramCache]: Analyzing trace with hash -840749559, now seen corresponding path program 1 times [2021-11-23 17:19:47,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:47,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1199366305] [2021-11-23 17:19:47,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:47,277 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:47,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:47,281 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:47,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Waiting until timeout for monitored process [2021-11-23 17:19:47,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:47,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:19:47,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:48,990 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 67 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:19:48,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:49,929 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 67 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:19:49,929 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:49,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1199366305] [2021-11-23 17:19:49,929 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1199366305] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:49,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1985417374] [2021-11-23 17:19:49,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:49,930 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:49,930 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:49,930 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:49,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (80)] Waiting until timeout for monitored process [2021-11-23 17:19:50,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:50,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:19:50,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:51,315 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:19:51,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:51,976 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:19:51,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1985417374] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:51,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [592917370] [2021-11-23 17:19:51,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:51,977 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:51,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:19:51,978 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:19:51,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2021-11-23 17:19:52,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:52,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:19:52,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:53,264 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:19:53,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:53,942 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:19:53,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [592917370] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:53,943 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:19:53,943 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 19 [2021-11-23 17:19:53,943 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994681563] [2021-11-23 17:19:53,943 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:19:53,944 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 17:19:53,944 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:53,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 17:19:53,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:19:53,945 INFO L87 Difference]: Start difference. First operand 3633 states and 5083 transitions. Second operand has 20 states, 20 states have (on average 11.45) internal successors, (229), 19 states have internal predecessors, (229), 0 states have call successors, (0), 0 states 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 17:19:54,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:54,696 INFO L93 Difference]: Finished difference Result 4842 states and 6607 transitions. [2021-11-23 17:19:54,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 17:19:54,696 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 11.45) internal successors, (229), 19 states have internal predecessors, (229), 0 states have call successors, (0), 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 112 [2021-11-23 17:19:54,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:54,701 INFO L225 Difference]: With dead ends: 4842 [2021-11-23 17:19:54,701 INFO L226 Difference]: Without dead ends: 4382 [2021-11-23 17:19:54,703 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 679 GetRequests, 651 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=152, Invalid=718, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:19:54,703 INFO L933 BasicCegarLoop]: 1529 mSDtfsCounter, 4485 mSDsluCounter, 15384 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4485 SdHoareTripleChecker+Valid, 16913 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 119 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:54,703 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4485 Valid, 16913 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 45 Invalid, 0 Unknown, 119 Unchecked, 0.1s Time] [2021-11-23 17:19:54,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4382 states. [2021-11-23 17:19:54,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4382 to 4351. [2021-11-23 17:19:54,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4351 states, 4349 states have (on average 1.368590480570246) internal successors, (5952), 4350 states have internal predecessors, (5952), 0 states have call successors, (0), 0 states 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 17:19:54,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4351 states to 4351 states and 5952 transitions. [2021-11-23 17:19:54,966 INFO L78 Accepts]: Start accepts. Automaton has 4351 states and 5952 transitions. Word has length 112 [2021-11-23 17:19:54,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:54,966 INFO L470 AbstractCegarLoop]: Abstraction has 4351 states and 5952 transitions. [2021-11-23 17:19:54,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 11.45) internal successors, (229), 19 states have internal predecessors, (229), 0 states have call successors, (0), 0 states 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 17:19:54,967 INFO L276 IsEmpty]: Start isEmpty. Operand 4351 states and 5952 transitions. [2021-11-23 17:19:54,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:19:54,969 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:54,969 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:19:54,994 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:55,173 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (80)] Ended with exit code 0 [2021-11-23 17:19:55,383 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:55,572 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:19:55,573 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:55,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:55,573 INFO L85 PathProgramCache]: Analyzing trace with hash -803262144, now seen corresponding path program 1 times [2021-11-23 17:19:55,573 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:55,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [488490234] [2021-11-23 17:19:55,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:55,574 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:55,574 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:55,575 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:55,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Waiting until timeout for monitored process [2021-11-23 17:19:55,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:55,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:19:55,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:57,578 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:19:57,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:58,399 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:19:58,399 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:58,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [488490234] [2021-11-23 17:19:58,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [488490234] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:58,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [138890438] [2021-11-23 17:19:58,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:58,400 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:58,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:58,401 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:58,402 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (83)] Waiting until timeout for monitored process [2021-11-23 17:19:58,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:58,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:19:58,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:00,351 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:20:00,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:00,922 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:20:00,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [138890438] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:00,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1293023961] [2021-11-23 17:20:00,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:00,923 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:20:00,923 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:20:00,924 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:20:00,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2021-11-23 17:20:00,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:00,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:20:01,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:02,794 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:20:02,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:03,452 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:20:03,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1293023961] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:03,452 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:20:03,452 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:20:03,453 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72338633] [2021-11-23 17:20:03,453 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:20:03,453 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:20:03,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:03,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:20:03,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:20:03,455 INFO L87 Difference]: Start difference. First operand 4351 states and 5952 transitions. Second operand has 16 states, 16 states have (on average 11.3125) internal successors, (181), 15 states have internal predecessors, (181), 0 states have call successors, (0), 0 states 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 17:20:04,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:04,361 INFO L93 Difference]: Finished difference Result 6879 states and 9128 transitions. [2021-11-23 17:20:04,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 17:20:04,361 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.3125) internal successors, (181), 15 states have internal predecessors, (181), 0 states have call successors, (0), 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 112 [2021-11-23 17:20:04,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:04,367 INFO L225 Difference]: With dead ends: 6879 [2021-11-23 17:20:04,368 INFO L226 Difference]: Without dead ends: 5956 [2021-11-23 17:20:04,370 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 683 GetRequests, 655 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:20:04,370 INFO L933 BasicCegarLoop]: 1539 mSDtfsCounter, 4443 mSDsluCounter, 10922 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4443 SdHoareTripleChecker+Valid, 12461 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 75 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:04,371 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4443 Valid, 12461 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 42 Invalid, 0 Unknown, 75 Unchecked, 0.1s Time] [2021-11-23 17:20:04,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5956 states. [2021-11-23 17:20:04,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5956 to 5728. [2021-11-23 17:20:04,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5728 states, 5726 states have (on average 1.3344393992315753) internal successors, (7641), 5727 states have internal predecessors, (7641), 0 states have call successors, (0), 0 states 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 17:20:04,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5728 states to 5728 states and 7641 transitions. [2021-11-23 17:20:04,695 INFO L78 Accepts]: Start accepts. Automaton has 5728 states and 7641 transitions. Word has length 112 [2021-11-23 17:20:04,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:04,695 INFO L470 AbstractCegarLoop]: Abstraction has 5728 states and 7641 transitions. [2021-11-23 17:20:04,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.3125) internal successors, (181), 15 states have internal predecessors, (181), 0 states have call successors, (0), 0 states 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 17:20:04,695 INFO L276 IsEmpty]: Start isEmpty. Operand 5728 states and 7641 transitions. [2021-11-23 17:20:04,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:20:04,697 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:04,697 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 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] [2021-11-23 17:20:04,699 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (83)] Ended with exit code 0 [2021-11-23 17:20:04,923 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Ended with exit code 0 [2021-11-23 17:20:05,107 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Ended with exit code 0 [2021-11-23 17:20:05,298 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:20:05,298 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:05,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:05,298 INFO L85 PathProgramCache]: Analyzing trace with hash -7680944, now seen corresponding path program 1 times [2021-11-23 17:20:05,299 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:05,299 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [42123289] [2021-11-23 17:20:05,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:05,299 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:05,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:05,300 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:05,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (85)] Waiting until timeout for monitored process [2021-11-23 17:20:05,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:05,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:20:05,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:06,355 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 17:20:06,355 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:20:06,355 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:06,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [42123289] [2021-11-23 17:20:06,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [42123289] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:20:06,355 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:20:06,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:20:06,355 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931362346] [2021-11-23 17:20:06,356 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:20:06,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:20:06,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:06,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:20:06,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:20:06,357 INFO L87 Difference]: Start difference. First operand 5728 states and 7641 transitions. Second operand has 6 states, 6 states have (on average 17.166666666666668) internal successors, (103), 5 states have internal predecessors, (103), 0 states have call successors, (0), 0 states 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 17:20:06,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:06,674 INFO L93 Difference]: Finished difference Result 6623 states and 8795 transitions. [2021-11-23 17:20:06,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:20:06,674 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.166666666666668) internal successors, (103), 5 states have internal predecessors, (103), 0 states have call successors, (0), 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 112 [2021-11-23 17:20:06,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:06,682 INFO L225 Difference]: With dead ends: 6623 [2021-11-23 17:20:06,682 INFO L226 Difference]: Without dead ends: 6167 [2021-11-23 17:20:06,685 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:20:06,685 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 1487 mSDsluCounter, 3073 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1487 SdHoareTripleChecker+Valid, 4594 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 45 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:06,685 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1487 Valid, 4594 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 45 Unchecked, 0.0s Time] [2021-11-23 17:20:06,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6167 states. [2021-11-23 17:20:07,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6167 to 6165. [2021-11-23 17:20:07,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6165 states, 6163 states have (on average 1.3254908323868246) internal successors, (8169), 6164 states have internal predecessors, (8169), 0 states have call successors, (0), 0 states 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 17:20:07,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6165 states to 6165 states and 8169 transitions. [2021-11-23 17:20:07,091 INFO L78 Accepts]: Start accepts. Automaton has 6165 states and 8169 transitions. Word has length 112 [2021-11-23 17:20:07,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:07,092 INFO L470 AbstractCegarLoop]: Abstraction has 6165 states and 8169 transitions. [2021-11-23 17:20:07,092 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.166666666666668) internal successors, (103), 5 states have internal predecessors, (103), 0 states have call successors, (0), 0 states 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 17:20:07,093 INFO L276 IsEmpty]: Start isEmpty. Operand 6165 states and 8169 transitions. [2021-11-23 17:20:07,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:20:07,096 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:07,096 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:20:07,116 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (85)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:07,311 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:20:07,312 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:07,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:07,312 INFO L85 PathProgramCache]: Analyzing trace with hash 1933874233, now seen corresponding path program 1 times [2021-11-23 17:20:07,313 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:07,313 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [613278239] [2021-11-23 17:20:07,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:07,313 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:07,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:07,315 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:07,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Waiting until timeout for monitored process [2021-11-23 17:20:07,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:07,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:20:07,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:09,336 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 48 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 17:20:09,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:10,015 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 48 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 17:20:10,015 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:10,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [613278239] [2021-11-23 17:20:10,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [613278239] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:10,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [427903321] [2021-11-23 17:20:10,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:10,016 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:10,016 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:20:10,017 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:20:10,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Waiting until timeout for monitored process [2021-11-23 17:20:10,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:10,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:20:10,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:11,966 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 48 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 17:20:11,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:12,484 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 48 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 17:20:12,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [427903321] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:12,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260568407] [2021-11-23 17:20:12,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:12,484 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:20:12,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:20:12,485 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:20:12,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-23 17:20:12,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:12,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:20:12,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:14,308 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 48 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 17:20:14,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:14,797 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 48 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 17:20:14,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260568407] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:14,797 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:20:14,797 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:20:14,798 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437514140] [2021-11-23 17:20:14,798 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:20:14,798 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:20:14,799 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:14,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:20:14,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:20:14,799 INFO L87 Difference]: Start difference. First operand 6165 states and 8169 transitions. Second operand has 16 states, 16 states have (on average 11.4375) internal successors, (183), 15 states have internal predecessors, (183), 0 states have call successors, (0), 0 states 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 17:20:15,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:15,670 INFO L93 Difference]: Finished difference Result 9535 states and 12401 transitions. [2021-11-23 17:20:15,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 17:20:15,671 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.4375) internal successors, (183), 15 states have internal predecessors, (183), 0 states have call successors, (0), 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 112 [2021-11-23 17:20:15,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:15,680 INFO L225 Difference]: With dead ends: 9535 [2021-11-23 17:20:15,680 INFO L226 Difference]: Without dead ends: 8703 [2021-11-23 17:20:15,683 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 675 GetRequests, 654 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2021-11-23 17:20:15,683 INFO L933 BasicCegarLoop]: 1528 mSDtfsCounter, 7401 mSDsluCounter, 10688 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7401 SdHoareTripleChecker+Valid, 12216 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:15,684 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7401 Valid, 12216 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 28 Invalid, 0 Unknown, 59 Unchecked, 0.0s Time] [2021-11-23 17:20:15,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8703 states. [2021-11-23 17:20:16,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8703 to 8657. [2021-11-23 17:20:16,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8657 states, 8655 states have (on average 1.2978625072212593) internal successors, (11233), 8656 states have internal predecessors, (11233), 0 states have call successors, (0), 0 states 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 17:20:16,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8657 states to 8657 states and 11233 transitions. [2021-11-23 17:20:16,254 INFO L78 Accepts]: Start accepts. Automaton has 8657 states and 11233 transitions. Word has length 112 [2021-11-23 17:20:16,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:16,255 INFO L470 AbstractCegarLoop]: Abstraction has 8657 states and 11233 transitions. [2021-11-23 17:20:16,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.4375) internal successors, (183), 15 states have internal predecessors, (183), 0 states have call successors, (0), 0 states 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 17:20:16,255 INFO L276 IsEmpty]: Start isEmpty. Operand 8657 states and 11233 transitions. [2021-11-23 17:20:16,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:20:16,259 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:16,259 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 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] [2021-11-23 17:20:16,274 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Ended with exit code 0 [2021-11-23 17:20:16,500 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Ended with exit code 0 [2021-11-23 17:20:16,674 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Ended with exit code 0 [2021-11-23 17:20:16,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:16,873 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:16,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:16,873 INFO L85 PathProgramCache]: Analyzing trace with hash 228754537, now seen corresponding path program 1 times [2021-11-23 17:20:16,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:16,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1932783548] [2021-11-23 17:20:16,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:16,874 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:16,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:16,875 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:16,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Waiting until timeout for monitored process [2021-11-23 17:20:16,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:16,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:20:16,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:19,227 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 58 proven. 32 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:20:19,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:20,231 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 58 proven. 32 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:20:20,231 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:20,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1932783548] [2021-11-23 17:20:20,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1932783548] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:20,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [414315481] [2021-11-23 17:20:20,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:20,232 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:20,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:20:20,233 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:20:20,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Waiting until timeout for monitored process [2021-11-23 17:20:20,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:20,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:20:20,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:22,568 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 46 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 17:20:22,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:23,380 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 46 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 17:20:23,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [414315481] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:23,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [898285882] [2021-11-23 17:20:23,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:23,381 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:20:23,381 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:20:23,382 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:20:23,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2021-11-23 17:20:23,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:23,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:20:23,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:25,143 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 46 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 17:20:25,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:25,697 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 46 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 17:20:25,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [898285882] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:25,697 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:20:25,697 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:20:25,698 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739505252] [2021-11-23 17:20:25,698 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:20:25,698 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:20:25,699 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:25,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:20:25,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:20:25,700 INFO L87 Difference]: Start difference. First operand 8657 states and 11233 transitions. Second operand has 32 states, 32 states have (on average 10.78125) internal successors, (345), 31 states have internal predecessors, (345), 0 states have call successors, (0), 0 states 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 17:20:28,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:28,039 INFO L93 Difference]: Finished difference Result 9881 states and 12771 transitions. [2021-11-23 17:20:28,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:20:28,039 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 10.78125) internal successors, (345), 31 states have internal predecessors, (345), 0 states have call successors, (0), 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 112 [2021-11-23 17:20:28,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:28,048 INFO L225 Difference]: With dead ends: 9881 [2021-11-23 17:20:28,048 INFO L226 Difference]: Without dead ends: 9429 [2021-11-23 17:20:28,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 694 GetRequests, 643 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=316, Invalid=2234, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 17:20:28,051 INFO L933 BasicCegarLoop]: 1553 mSDtfsCounter, 11678 mSDsluCounter, 24846 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11678 SdHoareTripleChecker+Valid, 26399 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 157 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:28,051 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11678 Valid, 26399 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 87 Invalid, 0 Unknown, 157 Unchecked, 0.1s Time] [2021-11-23 17:20:28,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9429 states. [2021-11-23 17:20:28,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9429 to 9366. [2021-11-23 17:20:28,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9366 states, 9364 states have (on average 1.2937847073900042) internal successors, (12115), 9365 states have internal predecessors, (12115), 0 states have call successors, (0), 0 states 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 17:20:28,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9366 states to 9366 states and 12115 transitions. [2021-11-23 17:20:28,652 INFO L78 Accepts]: Start accepts. Automaton has 9366 states and 12115 transitions. Word has length 112 [2021-11-23 17:20:28,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:28,652 INFO L470 AbstractCegarLoop]: Abstraction has 9366 states and 12115 transitions. [2021-11-23 17:20:28,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 10.78125) internal successors, (345), 31 states have internal predecessors, (345), 0 states have call successors, (0), 0 states 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 17:20:28,653 INFO L276 IsEmpty]: Start isEmpty. Operand 9366 states and 12115 transitions. [2021-11-23 17:20:28,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:20:28,656 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:28,656 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 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] [2021-11-23 17:20:28,680 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Ended with exit code 0 [2021-11-23 17:20:28,858 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Ended with exit code 0 [2021-11-23 17:20:29,066 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Ended with exit code 0 [2021-11-23 17:20:29,258 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:20:29,258 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:29,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:29,258 INFO L85 PathProgramCache]: Analyzing trace with hash 724787817, now seen corresponding path program 1 times [2021-11-23 17:20:29,258 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:29,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [854383963] [2021-11-23 17:20:29,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:29,259 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:29,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:29,260 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:29,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Waiting until timeout for monitored process [2021-11-23 17:20:29,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:29,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:20:29,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:30,290 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 79 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:20:30,290 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:20:30,290 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:30,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [854383963] [2021-11-23 17:20:30,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [854383963] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:20:30,290 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:20:30,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:20:30,291 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768403924] [2021-11-23 17:20:30,291 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:20:30,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:20:30,291 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:30,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:20:30,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:20:30,292 INFO L87 Difference]: Start difference. First operand 9366 states and 12115 transitions. Second operand has 6 states, 6 states have (on average 17.0) internal successors, (102), 5 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:30,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:30,970 INFO L93 Difference]: Finished difference Result 11355 states and 14628 transitions. [2021-11-23 17:20:30,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:20:30,971 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.0) internal successors, (102), 5 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-23 17:20:30,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:30,983 INFO L225 Difference]: With dead ends: 11355 [2021-11-23 17:20:30,983 INFO L226 Difference]: Without dead ends: 10409 [2021-11-23 17:20:30,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:20:30,987 INFO L933 BasicCegarLoop]: 1526 mSDtfsCounter, 1510 mSDsluCounter, 1606 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1510 SdHoareTripleChecker+Valid, 3132 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:30,987 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1510 Valid, 3132 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 59 Unchecked, 0.1s Time] [2021-11-23 17:20:30,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10409 states. [2021-11-23 17:20:31,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10409 to 10369. [2021-11-23 17:20:31,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10369 states, 10367 states have (on average 1.2810842095109483) internal successors, (13281), 10368 states have internal predecessors, (13281), 0 states have call successors, (0), 0 states 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 17:20:31,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10369 states to 10369 states and 13281 transitions. [2021-11-23 17:20:31,726 INFO L78 Accepts]: Start accepts. Automaton has 10369 states and 13281 transitions. Word has length 112 [2021-11-23 17:20:31,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:31,726 INFO L470 AbstractCegarLoop]: Abstraction has 10369 states and 13281 transitions. [2021-11-23 17:20:31,726 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.0) internal successors, (102), 5 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:31,726 INFO L276 IsEmpty]: Start isEmpty. Operand 10369 states and 13281 transitions. [2021-11-23 17:20:31,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:20:31,729 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:31,729 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:20:31,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:31,929 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:20:31,930 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:31,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:31,930 INFO L85 PathProgramCache]: Analyzing trace with hash 1117709487, now seen corresponding path program 1 times [2021-11-23 17:20:31,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:31,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [552795639] [2021-11-23 17:20:31,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:31,930 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:31,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:31,931 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:31,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (93)] Waiting until timeout for monitored process [2021-11-23 17:20:32,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:32,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:20:32,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:39,164 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 26 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:39,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:42,210 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:42,211 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:42,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [552795639] [2021-11-23 17:20:42,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [552795639] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:42,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1142294365] [2021-11-23 17:20:42,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:42,211 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:42,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:20:42,212 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:20:42,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (94)] Waiting until timeout for monitored process [2021-11-23 17:20:42,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:42,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 17:20:42,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:52,117 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 26 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:52,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:56,350 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:56,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1142294365] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:56,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [763598369] [2021-11-23 17:20:56,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:56,351 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:20:56,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:20:56,352 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:20:56,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Waiting until timeout for monitored process [2021-11-23 17:20:56,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:56,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:20:56,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:06,025 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:06,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:09,318 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:09,319 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [763598369] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:09,319 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:21:09,319 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20, 30, 24, 22, 17] total 105 [2021-11-23 17:21:09,320 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779519894] [2021-11-23 17:21:09,320 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:21:09,320 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2021-11-23 17:21:09,320 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:09,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2021-11-23 17:21:09,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=980, Invalid=9940, Unknown=0, NotChecked=0, Total=10920 [2021-11-23 17:21:09,323 INFO L87 Difference]: Start difference. First operand 10369 states and 13281 transitions. Second operand has 105 states, 105 states have (on average 4.771428571428571) internal successors, (501), 105 states have internal predecessors, (501), 0 states have call successors, (0), 0 states 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 17:21:21,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:21,958 INFO L93 Difference]: Finished difference Result 16275 states and 20485 transitions. [2021-11-23 17:21:21,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-11-23 17:21:21,959 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 4.771428571428571) internal successors, (501), 105 states have internal predecessors, (501), 0 states have call successors, (0), 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 113 [2021-11-23 17:21:21,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:21,976 INFO L225 Difference]: With dead ends: 16275 [2021-11-23 17:21:21,976 INFO L226 Difference]: Without dead ends: 14958 [2021-11-23 17:21:21,985 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 721 GetRequests, 573 SyntacticMatches, 2 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8345 ImplicationChecksByTransitivity, 25.3s TimeCoverageRelationStatistics Valid=1593, Invalid=20163, Unknown=0, NotChecked=0, Total=21756 [2021-11-23 17:21:21,987 INFO L933 BasicCegarLoop]: 1698 mSDtfsCounter, 17945 mSDsluCounter, 57770 mSDsCounter, 0 mSdLazyCounter, 1694 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17945 SdHoareTripleChecker+Valid, 59468 SdHoareTripleChecker+Invalid, 2414 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 1694 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 678 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:21,987 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17945 Valid, 59468 Invalid, 2414 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [42 Valid, 1694 Invalid, 0 Unknown, 678 Unchecked, 3.3s Time] [2021-11-23 17:21:21,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14958 states. [2021-11-23 17:21:23,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14958 to 13333. [2021-11-23 17:21:23,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13333 states, 13331 states have (on average 1.270272297652089) internal successors, (16934), 13332 states have internal predecessors, (16934), 0 states have call successors, (0), 0 states 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 17:21:23,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13333 states to 13333 states and 16934 transitions. [2021-11-23 17:21:23,049 INFO L78 Accepts]: Start accepts. Automaton has 13333 states and 16934 transitions. Word has length 113 [2021-11-23 17:21:23,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:23,049 INFO L470 AbstractCegarLoop]: Abstraction has 13333 states and 16934 transitions. [2021-11-23 17:21:23,049 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 105 states have (on average 4.771428571428571) internal successors, (501), 105 states have internal predecessors, (501), 0 states have call successors, (0), 0 states 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 17:21:23,049 INFO L276 IsEmpty]: Start isEmpty. Operand 13333 states and 16934 transitions. [2021-11-23 17:21:23,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:21:23,052 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:23,052 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:21:23,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (93)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:23,274 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Ended with exit code 0 [2021-11-23 17:21:23,454 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (94)] Ended with exit code 0 [2021-11-23 17:21:23,653 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:23,653 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:23,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:23,653 INFO L85 PathProgramCache]: Analyzing trace with hash 2048005298, now seen corresponding path program 1 times [2021-11-23 17:21:23,654 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:23,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [707525095] [2021-11-23 17:21:23,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:23,654 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:23,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:23,655 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:23,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (96)] Waiting until timeout for monitored process [2021-11-23 17:21:23,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:23,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:21:23,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:25,019 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 52 proven. 38 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:21:25,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:25,656 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 65 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:21:25,657 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:25,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [707525095] [2021-11-23 17:21:25,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [707525095] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:25,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [773831395] [2021-11-23 17:21:25,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:25,657 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:25,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:21:25,658 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:21:25,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (97)] Waiting until timeout for monitored process [2021-11-23 17:21:25,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:25,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:21:25,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:27,313 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 52 proven. 38 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:21:27,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:27,700 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 65 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:21:27,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [773831395] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:27,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [605926051] [2021-11-23 17:21:27,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:27,700 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:27,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:21:27,702 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:21:27,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Waiting until timeout for monitored process [2021-11-23 17:21:27,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:27,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:21:27,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:28,766 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 54 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:21:28,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:29,161 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 65 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:21:29,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [605926051] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:29,161 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:21:29,161 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 15, 11, 12, 11] total 33 [2021-11-23 17:21:29,161 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55150072] [2021-11-23 17:21:29,161 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:21:29,162 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-23 17:21:29,162 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:29,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-23 17:21:29,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=893, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 17:21:29,163 INFO L87 Difference]: Start difference. First operand 13333 states and 16934 transitions. Second operand has 33 states, 33 states have (on average 8.242424242424242) internal successors, (272), 33 states have internal predecessors, (272), 0 states have call successors, (0), 0 states 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 17:21:31,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:31,670 INFO L93 Difference]: Finished difference Result 25826 states and 32646 transitions. [2021-11-23 17:21:31,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 17:21:31,671 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 8.242424242424242) internal successors, (272), 33 states have internal predecessors, (272), 0 states have call successors, (0), 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 113 [2021-11-23 17:21:31,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:31,701 INFO L225 Difference]: With dead ends: 25826 [2021-11-23 17:21:31,701 INFO L226 Difference]: Without dead ends: 21353 [2021-11-23 17:21:31,709 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 686 GetRequests, 643 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 513 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=275, Invalid=1531, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 17:21:31,710 INFO L933 BasicCegarLoop]: 1582 mSDtfsCounter, 6194 mSDsluCounter, 18254 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6194 SdHoareTripleChecker+Valid, 19836 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 85 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:31,710 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6194 Valid, 19836 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 175 Invalid, 0 Unknown, 85 Unchecked, 0.3s Time] [2021-11-23 17:21:31,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21353 states. [2021-11-23 17:21:33,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21353 to 19237. [2021-11-23 17:21:33,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19237 states, 19235 states have (on average 1.2640499090200157) internal successors, (24314), 19236 states have internal predecessors, (24314), 0 states have call successors, (0), 0 states 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 17:21:33,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19237 states to 19237 states and 24314 transitions. [2021-11-23 17:21:33,356 INFO L78 Accepts]: Start accepts. Automaton has 19237 states and 24314 transitions. Word has length 113 [2021-11-23 17:21:33,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:33,357 INFO L470 AbstractCegarLoop]: Abstraction has 19237 states and 24314 transitions. [2021-11-23 17:21:33,357 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 8.242424242424242) internal successors, (272), 33 states have internal predecessors, (272), 0 states have call successors, (0), 0 states 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 17:21:33,357 INFO L276 IsEmpty]: Start isEmpty. Operand 19237 states and 24314 transitions. [2021-11-23 17:21:33,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:21:33,360 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:33,360 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:21:33,369 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (96)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:33,584 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Ended with exit code 0 [2021-11-23 17:21:33,762 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (97)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:33,961 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:33,961 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:33,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:33,962 INFO L85 PathProgramCache]: Analyzing trace with hash -1844428728, now seen corresponding path program 1 times [2021-11-23 17:21:33,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:33,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1689244030] [2021-11-23 17:21:33,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:33,962 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:33,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:33,964 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:33,965 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (99)] Waiting until timeout for monitored process [2021-11-23 17:21:34,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:34,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:21:34,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:35,507 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 27 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:35,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:36,371 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 44 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:36,371 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:36,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1689244030] [2021-11-23 17:21:36,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1689244030] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:36,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [836981917] [2021-11-23 17:21:36,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:36,372 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:36,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:21:36,373 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:21:36,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (100)] Waiting until timeout for monitored process [2021-11-23 17:21:36,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:36,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:21:36,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:37,786 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 27 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:37,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:38,303 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 44 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:38,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [836981917] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:38,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784847424] [2021-11-23 17:21:38,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:38,304 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:38,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:21:38,304 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:21:38,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Waiting until timeout for monitored process [2021-11-23 17:21:38,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:38,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:21:38,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:44,080 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:44,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:45,406 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 44 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:45,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784847424] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:45,407 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:21:45,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 14, 11, 21, 15] total 48 [2021-11-23 17:21:45,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328060620] [2021-11-23 17:21:45,407 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:21:45,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:21:45,408 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:45,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:21:45,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=256, Invalid=2000, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:21:45,409 INFO L87 Difference]: Start difference. First operand 19237 states and 24314 transitions. Second operand has 48 states, 48 states have (on average 6.9375) internal successors, (333), 48 states have internal predecessors, (333), 0 states have call successors, (0), 0 states 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 17:21:49,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:49,489 INFO L93 Difference]: Finished difference Result 38878 states and 48918 transitions. [2021-11-23 17:21:49,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-23 17:21:49,490 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 6.9375) internal successors, (333), 48 states have internal predecessors, (333), 0 states have call successors, (0), 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 113 [2021-11-23 17:21:49,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:49,526 INFO L225 Difference]: With dead ends: 38878 [2021-11-23 17:21:49,526 INFO L226 Difference]: Without dead ends: 31608 [2021-11-23 17:21:49,536 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 702 GetRequests, 637 SyntacticMatches, 5 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1217 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=431, Invalid=3351, Unknown=0, NotChecked=0, Total=3782 [2021-11-23 17:21:49,540 INFO L933 BasicCegarLoop]: 1583 mSDtfsCounter, 12285 mSDsluCounter, 15414 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12285 SdHoareTripleChecker+Valid, 16997 SdHoareTripleChecker+Invalid, 647 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 323 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:49,540 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12285 Valid, 16997 Invalid, 647 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 307 Invalid, 0 Unknown, 323 Unchecked, 0.5s Time] [2021-11-23 17:21:49,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31608 states. [2021-11-23 17:21:51,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31608 to 26726. [2021-11-23 17:21:51,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26726 states, 26724 states have (on average 1.2639200718455321) internal successors, (33777), 26725 states have internal predecessors, (33777), 0 states have call successors, (0), 0 states 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 17:21:51,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26726 states to 26726 states and 33777 transitions. [2021-11-23 17:21:51,667 INFO L78 Accepts]: Start accepts. Automaton has 26726 states and 33777 transitions. Word has length 113 [2021-11-23 17:21:51,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:51,667 INFO L470 AbstractCegarLoop]: Abstraction has 26726 states and 33777 transitions. [2021-11-23 17:21:51,667 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 6.9375) internal successors, (333), 48 states have internal predecessors, (333), 0 states have call successors, (0), 0 states 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 17:21:51,667 INFO L276 IsEmpty]: Start isEmpty. Operand 26726 states and 33777 transitions. [2021-11-23 17:21:51,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:21:51,669 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:51,669 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:21:51,681 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (99)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:51,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (100)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:52,090 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Ended with exit code 0 [2021-11-23 17:21:52,270 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:52,270 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:52,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:52,271 INFO L85 PathProgramCache]: Analyzing trace with hash 588226190, now seen corresponding path program 1 times [2021-11-23 17:21:52,271 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:52,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [12275912] [2021-11-23 17:21:52,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:52,271 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:52,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:52,272 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:52,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Waiting until timeout for monitored process [2021-11-23 17:21:52,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:52,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:21:52,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:58,786 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 35 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:58,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:02,875 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 25 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:02,875 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:02,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [12275912] [2021-11-23 17:22:02,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [12275912] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:02,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1502777397] [2021-11-23 17:22:02,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:02,875 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:02,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:02,876 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:02,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Waiting until timeout for monitored process [2021-11-23 17:22:03,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:03,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 17:22:03,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:12,466 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 35 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:12,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:20,107 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 21 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:20,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1502777397] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:20,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1704168533] [2021-11-23 17:22:20,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:20,108 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:20,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:20,109 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:20,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2021-11-23 17:22:20,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:20,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 17:22:20,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:26,423 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 35 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:26,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:32,871 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 21 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:32,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1704168533] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:32,872 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:32,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 30, 28, 24, 24] total 133 [2021-11-23 17:22:32,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569189713] [2021-11-23 17:22:32,872 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:32,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2021-11-23 17:22:32,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:32,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2021-11-23 17:22:32,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2045, Invalid=15511, Unknown=0, NotChecked=0, Total=17556 [2021-11-23 17:22:32,875 INFO L87 Difference]: Start difference. First operand 26726 states and 33777 transitions. Second operand has 133 states, 133 states have (on average 3.917293233082707) internal successors, (521), 133 states have internal predecessors, (521), 0 states have call successors, (0), 0 states 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 17:22:52,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:52,293 INFO L93 Difference]: Finished difference Result 34307 states and 43157 transitions. [2021-11-23 17:22:52,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-11-23 17:22:52,294 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 3.917293233082707) internal successors, (521), 133 states have internal predecessors, (521), 0 states have call successors, (0), 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 113 [2021-11-23 17:22:52,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:52,330 INFO L225 Difference]: With dead ends: 34307 [2021-11-23 17:22:52,330 INFO L226 Difference]: Without dead ends: 29223 [2021-11-23 17:22:52,340 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 730 GetRequests, 558 SyntacticMatches, 2 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10763 ImplicationChecksByTransitivity, 35.9s TimeCoverageRelationStatistics Valid=3428, Invalid=25984, Unknown=0, NotChecked=0, Total=29412 [2021-11-23 17:22:52,341 INFO L933 BasicCegarLoop]: 1575 mSDtfsCounter, 37868 mSDsluCounter, 37112 mSDsCounter, 0 mSdLazyCounter, 2402 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37868 SdHoareTripleChecker+Valid, 38687 SdHoareTripleChecker+Invalid, 2852 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 2402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 363 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:52,341 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37868 Valid, 38687 Invalid, 2852 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [87 Valid, 2402 Invalid, 0 Unknown, 363 Unchecked, 4.6s Time] [2021-11-23 17:22:52,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29223 states. [2021-11-23 17:22:54,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29223 to 26716. [2021-11-23 17:22:54,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26716 states, 26714 states have (on average 1.264318334955454) internal successors, (33775), 26715 states have internal predecessors, (33775), 0 states have call successors, (0), 0 states 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 17:22:54,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26716 states to 26716 states and 33775 transitions. [2021-11-23 17:22:54,561 INFO L78 Accepts]: Start accepts. Automaton has 26716 states and 33775 transitions. Word has length 113 [2021-11-23 17:22:54,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:54,561 INFO L470 AbstractCegarLoop]: Abstraction has 26716 states and 33775 transitions. [2021-11-23 17:22:54,562 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 3.917293233082707) internal successors, (521), 133 states have internal predecessors, (521), 0 states have call successors, (0), 0 states 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 17:22:54,562 INFO L276 IsEmpty]: Start isEmpty. Operand 26716 states and 33775 transitions. [2021-11-23 17:22:54,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:22:54,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:54,564 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:22:54,585 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Ended with exit code 0 [2021-11-23 17:22:54,773 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Ended with exit code 0 [2021-11-23 17:22:54,967 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:55,165 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:55,166 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:55,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:55,166 INFO L85 PathProgramCache]: Analyzing trace with hash -1890239409, now seen corresponding path program 1 times [2021-11-23 17:22:55,167 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:55,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1829687676] [2021-11-23 17:22:55,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:55,167 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:55,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:55,169 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:55,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Waiting until timeout for monitored process [2021-11-23 17:22:55,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:55,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:22:55,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:56,830 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 30 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:56,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:57,649 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 45 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:57,649 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:57,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1829687676] [2021-11-23 17:22:57,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1829687676] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:57,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2014226138] [2021-11-23 17:22:57,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:57,650 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:57,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:57,651 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:57,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (106)] Waiting until timeout for monitored process [2021-11-23 17:22:57,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:57,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-23 17:22:57,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:05,943 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 34 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:05,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:11,789 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 23 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:11,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2014226138] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:11,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [735934085] [2021-11-23 17:23:11,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:11,789 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:11,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:11,790 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:11,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Waiting until timeout for monitored process [2021-11-23 17:23:11,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:11,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:23:11,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:13,362 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 32 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:13,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:13,872 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 45 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:13,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [735934085] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:13,872 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:13,873 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 32, 27, 12, 11] total 82 [2021-11-23 17:23:13,873 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938760690] [2021-11-23 17:23:13,873 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:13,874 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-23 17:23:13,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:13,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-23 17:23:13,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1001, Invalid=5641, Unknown=0, NotChecked=0, Total=6642 [2021-11-23 17:23:13,875 INFO L87 Difference]: Start difference. First operand 26716 states and 33775 transitions. Second operand has 82 states, 82 states have (on average 5.2439024390243905) internal successors, (430), 82 states have internal predecessors, (430), 0 states have call successors, (0), 0 states 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 17:23:46,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:46,664 INFO L93 Difference]: Finished difference Result 70888 states and 88465 transitions. [2021-11-23 17:23:46,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 169 states. [2021-11-23 17:23:46,664 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 5.2439024390243905) internal successors, (430), 82 states have internal predecessors, (430), 0 states have call successors, (0), 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 113 [2021-11-23 17:23:46,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:46,766 INFO L225 Difference]: With dead ends: 70888 [2021-11-23 17:23:46,766 INFO L226 Difference]: Without dead ends: 66245 [2021-11-23 17:23:46,787 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 884 GetRequests, 663 SyntacticMatches, 9 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16804 ImplicationChecksByTransitivity, 31.1s TimeCoverageRelationStatistics Valid=5453, Invalid=40129, Unknown=0, NotChecked=0, Total=45582 [2021-11-23 17:23:46,787 INFO L933 BasicCegarLoop]: 1685 mSDtfsCounter, 25643 mSDsluCounter, 35989 mSDsCounter, 0 mSdLazyCounter, 1957 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25643 SdHoareTripleChecker+Valid, 37674 SdHoareTripleChecker+Invalid, 3784 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 1957 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1726 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:46,788 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25643 Valid, 37674 Invalid, 3784 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [101 Valid, 1957 Invalid, 0 Unknown, 1726 Unchecked, 3.9s Time] [2021-11-23 17:23:46,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66245 states. [2021-11-23 17:23:51,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66245 to 46479. [2021-11-23 17:23:51,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46479 states, 46477 states have (on average 1.2631409084063085) internal successors, (58707), 46478 states have internal predecessors, (58707), 0 states have call successors, (0), 0 states 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 17:23:51,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46479 states to 46479 states and 58707 transitions. [2021-11-23 17:23:51,294 INFO L78 Accepts]: Start accepts. Automaton has 46479 states and 58707 transitions. Word has length 113 [2021-11-23 17:23:51,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:51,294 INFO L470 AbstractCegarLoop]: Abstraction has 46479 states and 58707 transitions. [2021-11-23 17:23:51,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 5.2439024390243905) internal successors, (430), 82 states have internal predecessors, (430), 0 states have call successors, (0), 0 states 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 17:23:51,294 INFO L276 IsEmpty]: Start isEmpty. Operand 46479 states and 58707 transitions. [2021-11-23 17:23:51,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:23:51,296 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:51,296 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:23:51,308 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:51,518 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Ended with exit code 0 [2021-11-23 17:23:51,698 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (106)] Ended with exit code 0 [2021-11-23 17:23:51,897 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:51,897 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:51,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:51,898 INFO L85 PathProgramCache]: Analyzing trace with hash -959943598, now seen corresponding path program 1 times [2021-11-23 17:23:51,898 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:51,898 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1639049675] [2021-11-23 17:23:51,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:51,899 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:51,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:51,900 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:51,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Waiting until timeout for monitored process [2021-11-23 17:23:51,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:51,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 17:23:51,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:58,743 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 34 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:58,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:01,546 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:01,546 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:01,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1639049675] [2021-11-23 17:24:01,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1639049675] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:01,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1701889293] [2021-11-23 17:24:01,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:01,547 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:01,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:01,548 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:01,549 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Waiting until timeout for monitored process [2021-11-23 17:24:01,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:01,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:24:01,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:07,455 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 34 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:07,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:08,899 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:08,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1701889293] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:08,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [274326344] [2021-11-23 17:24:08,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:08,900 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:08,900 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:08,901 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:08,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2021-11-23 17:24:08,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:08,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:24:08,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:14,200 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 34 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:14,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:16,086 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 34 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:16,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [274326344] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:16,086 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:16,086 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21, 23, 21, 18, 18] total 74 [2021-11-23 17:24:16,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630260867] [2021-11-23 17:24:16,087 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:16,087 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-23 17:24:16,087 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:16,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-23 17:24:16,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=416, Invalid=4986, Unknown=0, NotChecked=0, Total=5402 [2021-11-23 17:24:16,088 INFO L87 Difference]: Start difference. First operand 46479 states and 58707 transitions. Second operand has 74 states, 74 states have (on average 5.3108108108108105) internal successors, (393), 74 states have internal predecessors, (393), 0 states have call successors, (0), 0 states 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 17:24:27,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:27,443 INFO L93 Difference]: Finished difference Result 66943 states and 83623 transitions. [2021-11-23 17:24:27,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-23 17:24:27,445 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 5.3108108108108105) internal successors, (393), 74 states have internal predecessors, (393), 0 states have call successors, (0), 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 113 [2021-11-23 17:24:27,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:27,527 INFO L225 Difference]: With dead ends: 66943 [2021-11-23 17:24:27,527 INFO L226 Difference]: Without dead ends: 62128 [2021-11-23 17:24:27,541 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 701 GetRequests, 603 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 3870 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=773, Invalid=8929, Unknown=0, NotChecked=0, Total=9702 [2021-11-23 17:24:27,541 INFO L933 BasicCegarLoop]: 1630 mSDtfsCounter, 13487 mSDsluCounter, 32403 mSDsCounter, 0 mSdLazyCounter, 1123 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13487 SdHoareTripleChecker+Valid, 34033 SdHoareTripleChecker+Invalid, 1748 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 1123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 598 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:27,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13487 Valid, 34033 Invalid, 1748 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 1123 Invalid, 0 Unknown, 598 Unchecked, 1.7s Time] [2021-11-23 17:24:27,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62128 states. [2021-11-23 17:24:32,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62128 to 46413. [2021-11-23 17:24:32,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46413 states, 46411 states have (on average 1.2632350089418456) internal successors, (58628), 46412 states have internal predecessors, (58628), 0 states have call successors, (0), 0 states 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 17:24:32,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46413 states to 46413 states and 58628 transitions. [2021-11-23 17:24:32,614 INFO L78 Accepts]: Start accepts. Automaton has 46413 states and 58628 transitions. Word has length 113 [2021-11-23 17:24:32,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:32,614 INFO L470 AbstractCegarLoop]: Abstraction has 46413 states and 58628 transitions. [2021-11-23 17:24:32,615 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 5.3108108108108105) internal successors, (393), 74 states have internal predecessors, (393), 0 states have call successors, (0), 0 states 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 17:24:32,615 INFO L276 IsEmpty]: Start isEmpty. Operand 46413 states and 58628 transitions. [2021-11-23 17:24:32,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 17:24:32,618 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:32,618 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:24:32,668 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Ended with exit code 0 [2021-11-23 17:24:32,845 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Ended with exit code 0 [2021-11-23 17:24:33,137 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:33,236 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:33,236 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:33,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:33,237 INFO L85 PathProgramCache]: Analyzing trace with hash 1781048702, now seen corresponding path program 1 times [2021-11-23 17:24:33,237 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:33,237 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [198450399] [2021-11-23 17:24:33,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:33,237 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:33,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:33,238 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:33,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Waiting until timeout for monitored process [2021-11-23 17:24:33,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:33,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:24:33,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:38,549 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:38,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:40,881 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:40,882 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:40,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [198450399] [2021-11-23 17:24:40,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [198450399] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:40,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [549598118] [2021-11-23 17:24:40,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:40,882 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:40,882 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:40,883 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:40,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (112)] Waiting until timeout for monitored process [2021-11-23 17:24:41,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:41,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:24:41,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:46,374 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:46,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:47,222 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:47,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [549598118] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:47,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1438083603] [2021-11-23 17:24:47,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:47,223 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:47,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:47,224 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:47,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Waiting until timeout for monitored process [2021-11-23 17:24:47,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:47,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:24:47,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:51,822 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:51,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:52,774 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:52,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1438083603] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:52,775 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:52,775 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19, 18, 18, 17] total 51 [2021-11-23 17:24:52,775 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567067378] [2021-11-23 17:24:52,775 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:52,776 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 17:24:52,776 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:52,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 17:24:52,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=2336, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 17:24:52,776 INFO L87 Difference]: Start difference. First operand 46413 states and 58628 transitions. Second operand has 51 states, 51 states have (on average 5.784313725490196) internal successors, (295), 51 states have internal predecessors, (295), 0 states have call successors, (0), 0 states 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 17:24:57,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:57,375 INFO L93 Difference]: Finished difference Result 51269 states and 64808 transitions. [2021-11-23 17:24:57,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 17:24:57,376 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 5.784313725490196) internal successors, (295), 51 states have internal predecessors, (295), 0 states have call successors, (0), 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 114 [2021-11-23 17:24:57,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:57,432 INFO L225 Difference]: With dead ends: 51269 [2021-11-23 17:24:57,432 INFO L226 Difference]: Without dead ends: 46868 [2021-11-23 17:24:57,442 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 681 GetRequests, 629 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 909 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=245, Invalid=2511, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 17:24:57,443 INFO L933 BasicCegarLoop]: 1579 mSDtfsCounter, 8778 mSDsluCounter, 27240 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8778 SdHoareTripleChecker+Valid, 28819 SdHoareTripleChecker+Invalid, 522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 337 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:57,443 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8778 Valid, 28819 Invalid, 522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 176 Invalid, 0 Unknown, 337 Unchecked, 0.2s Time] [2021-11-23 17:24:57,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46868 states. [2021-11-23 17:25:01,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46868 to 46409. [2021-11-23 17:25:01,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46409 states, 46407 states have (on average 1.2632361497187925) internal successors, (58623), 46408 states have internal predecessors, (58623), 0 states have call successors, (0), 0 states 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 17:25:01,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46409 states to 46409 states and 58623 transitions. [2021-11-23 17:25:01,969 INFO L78 Accepts]: Start accepts. Automaton has 46409 states and 58623 transitions. Word has length 114 [2021-11-23 17:25:01,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:01,969 INFO L470 AbstractCegarLoop]: Abstraction has 46409 states and 58623 transitions. [2021-11-23 17:25:01,969 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 5.784313725490196) internal successors, (295), 51 states have internal predecessors, (295), 0 states have call successors, (0), 0 states 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 17:25:01,969 INFO L276 IsEmpty]: Start isEmpty. Operand 46409 states and 58623 transitions. [2021-11-23 17:25:01,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 17:25:01,971 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:01,971 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:25:01,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (112)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:02,180 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Ended with exit code 0 [2021-11-23 17:25:02,392 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Ended with exit code 0 [2021-11-23 17:25:02,572 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:02,572 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:02,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:02,572 INFO L85 PathProgramCache]: Analyzing trace with hash 807167624, now seen corresponding path program 1 times [2021-11-23 17:25:02,573 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:02,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [639230937] [2021-11-23 17:25:02,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:02,573 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:02,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:02,575 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:02,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (114)] Waiting until timeout for monitored process [2021-11-23 17:25:02,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:02,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:25:02,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:07,093 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 31 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:07,093 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:08,516 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 31 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:08,516 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:08,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [639230937] [2021-11-23 17:25:08,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [639230937] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:08,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [278121974] [2021-11-23 17:25:08,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:08,517 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:08,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:08,517 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:08,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (115)] Waiting until timeout for monitored process [2021-11-23 17:25:08,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:08,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:25:08,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:13,222 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 31 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:13,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:16,265 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:16,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [278121974] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:16,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2063549853] [2021-11-23 17:25:16,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:16,266 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:16,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:16,267 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:16,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Waiting until timeout for monitored process [2021-11-23 17:25:16,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:16,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:25:16,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:24,860 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:24,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:27,720 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:27,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2063549853] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:27,720 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:27,721 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 17, 21, 22, 24, 18] total 98 [2021-11-23 17:25:27,721 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171349015] [2021-11-23 17:25:27,721 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:27,722 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-11-23 17:25:27,722 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:27,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-11-23 17:25:27,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=704, Invalid=8802, Unknown=0, NotChecked=0, Total=9506 [2021-11-23 17:25:27,723 INFO L87 Difference]: Start difference. First operand 46409 states and 58623 transitions. Second operand has 98 states, 98 states have (on average 5.336734693877551) internal successors, (523), 98 states have internal predecessors, (523), 0 states have call successors, (0), 0 states 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 17:25:43,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:43,270 INFO L93 Difference]: Finished difference Result 59643 states and 75187 transitions. [2021-11-23 17:25:43,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-11-23 17:25:43,271 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 5.336734693877551) internal successors, (523), 98 states have internal predecessors, (523), 0 states have call successors, (0), 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 114 [2021-11-23 17:25:43,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:43,341 INFO L225 Difference]: With dead ends: 59643 [2021-11-23 17:25:43,341 INFO L226 Difference]: Without dead ends: 51574 [2021-11-23 17:25:43,354 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 736 GetRequests, 596 SyntacticMatches, 5 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6512 ImplicationChecksByTransitivity, 21.0s TimeCoverageRelationStatistics Valid=1375, Invalid=17257, Unknown=0, NotChecked=0, Total=18632 [2021-11-23 17:25:43,354 INFO L933 BasicCegarLoop]: 1663 mSDtfsCounter, 34124 mSDsluCounter, 57254 mSDsCounter, 0 mSdLazyCounter, 1197 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34124 SdHoareTripleChecker+Valid, 58917 SdHoareTripleChecker+Invalid, 2312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 1197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1074 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:43,354 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34124 Valid, 58917 Invalid, 2312 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [41 Valid, 1197 Invalid, 0 Unknown, 1074 Unchecked, 2.0s Time] [2021-11-23 17:25:43,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51574 states. [2021-11-23 17:25:48,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51574 to 46462. [2021-11-23 17:25:48,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46462 states, 46460 states have (on average 1.2629358588032715) internal successors, (58676), 46461 states have internal predecessors, (58676), 0 states have call successors, (0), 0 states 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 17:25:48,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46462 states to 46462 states and 58676 transitions. [2021-11-23 17:25:48,104 INFO L78 Accepts]: Start accepts. Automaton has 46462 states and 58676 transitions. Word has length 114 [2021-11-23 17:25:48,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:48,105 INFO L470 AbstractCegarLoop]: Abstraction has 46462 states and 58676 transitions. [2021-11-23 17:25:48,105 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 5.336734693877551) internal successors, (523), 98 states have internal predecessors, (523), 0 states have call successors, (0), 0 states 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 17:25:48,105 INFO L276 IsEmpty]: Start isEmpty. Operand 46462 states and 58676 transitions. [2021-11-23 17:25:48,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 17:25:48,247 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:48,247 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:25:48,256 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (114)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:48,468 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Ended with exit code 0 [2021-11-23 17:25:48,649 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (115)] Ended with exit code 0 [2021-11-23 17:25:48,848 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:48,848 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:48,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:48,848 INFO L85 PathProgramCache]: Analyzing trace with hash 1613983233, now seen corresponding path program 1 times [2021-11-23 17:25:48,848 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:48,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1393133340] [2021-11-23 17:25:48,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:48,849 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:48,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:48,850 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:48,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (117)] Waiting until timeout for monitored process [2021-11-23 17:25:48,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:48,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:25:48,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:50,266 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 30 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:50,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:51,028 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 45 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:51,028 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:51,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1393133340] [2021-11-23 17:25:51,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1393133340] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:51,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [642474287] [2021-11-23 17:25:51,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:51,029 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:51,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:51,029 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:51,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (118)] Waiting until timeout for monitored process [2021-11-23 17:25:51,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:51,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 17:25:51,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:58,215 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 25 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:58,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:02,258 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 23 proven. 71 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:02,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [642474287] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:02,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1091451296] [2021-11-23 17:26:02,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:02,258 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:02,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:26:02,259 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:26:02,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e38e68a5-3e9c-4daf-8688-0281fde3c7fa/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Waiting until timeout for monitored process [2021-11-23 17:26:02,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:02,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:26:02,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:03,563 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 32 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:03,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:03,972 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 45 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:03,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1091451296] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:03,973 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:26:03,973 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 30, 23, 12, 11] total 76 [2021-11-23 17:26:03,973 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618344042] [2021-11-23 17:26:03,973 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:26:03,974 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2021-11-23 17:26:03,974 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:26:03,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-11-23 17:26:03,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=879, Invalid=4821, Unknown=0, NotChecked=0, Total=5700 [2021-11-23 17:26:03,975 INFO L87 Difference]: Start difference. First operand 46462 states and 58676 transitions. Second operand has 76 states, 76 states have (on average 5.7105263157894735) internal successors, (434), 76 states have internal predecessors, (434), 0 states have call successors, (0), 0 states 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 17:26:30,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:26:30,823 INFO L93 Difference]: Finished difference Result 91515 states and 114163 transitions. [2021-11-23 17:26:30,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2021-11-23 17:26:30,824 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 5.7105263157894735) internal successors, (434), 76 states have internal predecessors, (434), 0 states have call successors, (0), 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 114 [2021-11-23 17:26:30,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:26:30,936 INFO L225 Difference]: With dead ends: 91515 [2021-11-23 17:26:30,936 INFO L226 Difference]: Without dead ends: 81053 [2021-11-23 17:26:30,955 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 838 GetRequests, 647 SyntacticMatches, 16 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12794 ImplicationChecksByTransitivity, 22.2s TimeCoverageRelationStatistics Valid=4825, Invalid=26327, Unknown=0, NotChecked=0, Total=31152 [2021-11-23 17:26:30,956 INFO L933 BasicCegarLoop]: 1629 mSDtfsCounter, 15708 mSDsluCounter, 38412 mSDsCounter, 0 mSdLazyCounter, 1394 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15708 SdHoareTripleChecker+Valid, 40041 SdHoareTripleChecker+Invalid, 3099 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 1394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1578 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:26:30,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15708 Valid, 40041 Invalid, 3099 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [127 Valid, 1394 Invalid, 0 Unknown, 1578 Unchecked, 2.5s Time] [2021-11-23 17:26:31,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81053 states.