./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label01.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_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/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_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label01.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/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_18c28b99-28bd-4c05-9de9-340ea61332af/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 b034b25c13122a131dcef5e20457a6ebe39c9d7c5637a670f7b0b39a233b1f7a --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:15:56,841 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:15:56,843 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:15:56,904 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:15:56,904 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:15:56,911 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:15:56,913 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:15:56,919 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:15:56,923 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:15:56,932 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:15:56,933 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:15:56,936 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:15:56,937 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:15:56,941 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:15:56,945 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:15:56,952 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:15:56,955 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:15:56,957 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:15:56,963 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:15:56,968 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:15:56,971 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:15:56,973 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:15:56,975 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:15:56,976 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:15:56,981 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:15:56,982 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:15:56,982 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:15:56,984 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:15:56,984 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:15:56,986 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:15:56,987 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:15:56,988 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:15:56,989 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:15:56,990 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:15:56,992 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:15:56,993 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:15:56,994 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:15:56,994 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:15:56,995 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:15:56,996 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:15:56,997 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:15:56,999 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:15:57,028 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:15:57,028 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:15:57,029 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:15:57,029 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:15:57,030 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:15:57,030 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:15:57,030 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:15:57,031 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:15:57,031 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:15:57,031 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:15:57,032 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:15:57,032 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:15:57,032 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:15:57,032 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:15:57,033 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:15:57,033 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:15:57,033 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:15:57,034 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:15:57,035 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:15:57,035 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:15:57,035 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:15:57,035 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:15:57,036 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:15:57,036 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:15:57,036 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:15:57,036 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:15:57,037 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:15:57,037 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:15:57,037 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:15:57,038 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:15:57,038 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:15:57,038 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:15:57,038 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:15:57,039 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:15:57,039 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:15:57,039 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:15:57,040 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:15:57,040 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:15:57,040 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:15:57,040 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:15:57,041 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:15:57,041 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_18c28b99-28bd-4c05-9de9-340ea61332af/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b034b25c13122a131dcef5e20457a6ebe39c9d7c5637a670f7b0b39a233b1f7a [2021-11-23 17:15:57,404 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:15:57,428 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:15:57,431 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:15:57,432 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:15:57,433 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:15:57,435 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label01.c [2021-11-23 17:15:57,503 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/data/a18841445/85a194781c6b4337aad15ee7e767756f/FLAGc05a77895 [2021-11-23 17:15:58,476 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:15:58,477 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label01.c [2021-11-23 17:15:58,530 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/data/a18841445/85a194781c6b4337aad15ee7e767756f/FLAGc05a77895 [2021-11-23 17:15:58,885 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/data/a18841445/85a194781c6b4337aad15ee7e767756f [2021-11-23 17:15:58,891 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:15:58,894 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:15:58,896 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:15:58,897 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:15:58,901 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:15:58,902 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:15:58" (1/1) ... [2021-11-23 17:15:58,904 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@385465ff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:58, skipping insertion in model container [2021-11-23 17:15:58,904 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:15:58" (1/1) ... [2021-11-23 17:15:58,914 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:15:59,114 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:15:59,639 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_18c28b99-28bd-4c05-9de9-340ea61332af/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label01.c[6354,6367] [2021-11-23 17:15:59,701 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_18c28b99-28bd-4c05-9de9-340ea61332af/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label01.c[11909,11922] [2021-11-23 17:16:00,871 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:16:00,880 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:16:00,928 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_18c28b99-28bd-4c05-9de9-340ea61332af/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label01.c[6354,6367] [2021-11-23 17:16:00,940 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_18c28b99-28bd-4c05-9de9-340ea61332af/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label01.c[11909,11922] [2021-11-23 17:16:01,656 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:16:01,694 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:16:01,694 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:01 WrapperNode [2021-11-23 17:16:01,695 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:16:01,696 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:16:01,696 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:16:01,696 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:16:01,707 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:01" (1/1) ... [2021-11-23 17:16:01,784 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:01" (1/1) ... [2021-11-23 17:16:02,321 INFO L137 Inliner]: procedures = 33, calls = 19, calls flagged for inlining = 14, calls inlined = 14, statements flattened = 4976 [2021-11-23 17:16:02,326 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:16:02,327 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:16:02,338 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:16:02,339 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:16:02,349 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:01" (1/1) ... [2021-11-23 17:16:02,349 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:01" (1/1) ... [2021-11-23 17:16:02,465 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:01" (1/1) ... [2021-11-23 17:16:02,465 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:01" (1/1) ... [2021-11-23 17:16:02,779 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:01" (1/1) ... [2021-11-23 17:16:02,820 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:01" (1/1) ... [2021-11-23 17:16:02,846 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:01" (1/1) ... [2021-11-23 17:16:02,906 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:16:02,907 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:16:02,907 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:16:02,908 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:16:02,909 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:01" (1/1) ... [2021-11-23 17:16:02,918 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:16:02,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:16:02,948 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:16:02,965 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:16:03,013 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:16:03,013 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:16:03,013 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:16:03,013 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:16:03,184 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:16:03,186 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:16:08,590 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:16:08,687 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 17:16:08,694 INFO L158 Benchmark]: Toolchain (without parser) took 9798.16ms. Allocated memory was 81.8MB in the beginning and 503.3MB in the end (delta: 421.5MB). Free memory was 47.9MB in the beginning and 223.2MB in the end (delta: -175.3MB). Peak memory consumption was 247.0MB. Max. memory is 16.1GB. [2021-11-23 17:16:08,696 INFO L158 Benchmark]: CDTParser took 0.30ms. Allocated memory is still 81.8MB. Free memory was 61.5MB in the beginning and 61.4MB in the end (delta: 84.1kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:16:08,698 INFO L158 Benchmark]: CACSL2BoogieTranslator took 2798.87ms. Allocated memory was 81.8MB in the beginning and 142.6MB in the end (delta: 60.8MB). Free memory was 47.6MB in the beginning and 84.0MB in the end (delta: -36.4MB). Peak memory consumption was 62.0MB. Max. memory is 16.1GB. [2021-11-23 17:16:08,699 INFO L158 Benchmark]: Boogie Procedure Inliner took 630.66ms. Allocated memory is still 142.6MB. Free memory was 84.0MB in the beginning and 47.4MB in the end (delta: 36.5MB). Peak memory consumption was 70.6MB. Max. memory is 16.1GB. [2021-11-23 17:16:08,701 INFO L158 Benchmark]: Boogie Preprocessor took 578.66ms. Allocated memory was 142.6MB in the beginning and 285.2MB in the end (delta: 142.6MB). Free memory was 47.4MB in the beginning and 160.8MB in the end (delta: -113.3MB). Peak memory consumption was 28.3MB. Max. memory is 16.1GB. [2021-11-23 17:16:08,702 INFO L158 Benchmark]: RCFGBuilder took 5783.91ms. Allocated memory was 285.2MB in the beginning and 503.3MB in the end (delta: 218.1MB). Free memory was 160.8MB in the beginning and 223.2MB in the end (delta: -62.4MB). Peak memory consumption was 157.4MB. Max. memory is 16.1GB. [2021-11-23 17:16:08,713 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30ms. Allocated memory is still 81.8MB. Free memory was 61.5MB in the beginning and 61.4MB in the end (delta: 84.1kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 2798.87ms. Allocated memory was 81.8MB in the beginning and 142.6MB in the end (delta: 60.8MB). Free memory was 47.6MB in the beginning and 84.0MB in the end (delta: -36.4MB). Peak memory consumption was 62.0MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 630.66ms. Allocated memory is still 142.6MB. Free memory was 84.0MB in the beginning and 47.4MB in the end (delta: 36.5MB). Peak memory consumption was 70.6MB. Max. memory is 16.1GB. * Boogie Preprocessor took 578.66ms. Allocated memory was 142.6MB in the beginning and 285.2MB in the end (delta: 142.6MB). Free memory was 47.4MB in the beginning and 160.8MB in the end (delta: -113.3MB). Peak memory consumption was 28.3MB. Max. memory is 16.1GB. * RCFGBuilder took 5783.91ms. Allocated memory was 285.2MB in the beginning and 503.3MB in the end (delta: 218.1MB). Free memory was 160.8MB in the beginning and 223.2MB in the end (delta: -62.4MB). Peak memory consumption was 157.4MB. 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 17:16:08,750 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/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_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/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_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label01.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/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_18c28b99-28bd-4c05-9de9-340ea61332af/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 b034b25c13122a131dcef5e20457a6ebe39c9d7c5637a670f7b0b39a233b1f7a --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:16:11,806 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:16:11,810 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:16:11,862 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:16:11,863 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:16:11,867 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:16:11,869 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:16:11,874 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:16:11,877 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:16:11,885 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:16:11,887 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:16:11,889 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:16:11,889 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:16:11,892 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:16:11,895 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:16:11,899 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:16:11,901 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:16:11,902 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:16:11,905 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:16:11,913 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:16:11,915 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:16:11,917 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:16:11,919 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:16:11,922 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:16:11,931 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:16:11,931 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:16:11,932 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:16:11,934 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:16:11,935 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:16:11,936 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:16:11,937 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:16:11,938 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:16:11,940 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:16:11,941 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:16:11,944 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:16:11,945 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:16:11,946 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:16:11,946 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:16:11,946 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:16:11,948 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:16:11,949 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:16:11,954 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:16:12,005 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:16:12,005 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:16:12,006 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:16:12,007 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:16:12,008 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:16:12,008 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:16:12,008 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:16:12,009 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:16:12,009 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:16:12,009 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:16:12,011 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:16:12,011 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:16:12,013 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:16:12,013 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:16:12,014 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:16:12,014 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:16:12,014 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:16:12,015 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:16:12,015 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:16:12,015 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:16:12,015 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:16:12,016 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:16:12,016 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:16:12,016 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:16:12,017 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:16:12,017 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:16:12,017 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:16:12,018 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:16:12,018 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:16:12,018 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:16:12,019 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:16:12,019 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:16:12,020 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:16:12,020 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:16:12,020 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:12,021 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:16:12,021 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:16:12,022 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:16:12,022 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_18c28b99-28bd-4c05-9de9-340ea61332af/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b034b25c13122a131dcef5e20457a6ebe39c9d7c5637a670f7b0b39a233b1f7a [2021-11-23 17:16:12,423 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:16:12,449 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:16:12,452 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:16:12,454 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:16:12,455 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:16:12,457 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label01.c [2021-11-23 17:16:12,545 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/data/b8f3029b9/bb465f4300ea4d9b9fb9de4a36a5380a/FLAG13d4983dd [2021-11-23 17:16:13,533 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:16:13,533 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label01.c [2021-11-23 17:16:13,566 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/data/b8f3029b9/bb465f4300ea4d9b9fb9de4a36a5380a/FLAG13d4983dd [2021-11-23 17:16:14,029 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/data/b8f3029b9/bb465f4300ea4d9b9fb9de4a36a5380a [2021-11-23 17:16:14,032 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:16:14,034 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:16:14,035 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:16:14,036 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:16:14,039 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:16:14,040 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:16:14" (1/1) ... [2021-11-23 17:16:14,042 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c59891e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:14, skipping insertion in model container [2021-11-23 17:16:14,042 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:16:14" (1/1) ... [2021-11-23 17:16:14,049 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:16:14,203 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:16:14,685 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_18c28b99-28bd-4c05-9de9-340ea61332af/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label01.c[6354,6367] [2021-11-23 17:16:14,788 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_18c28b99-28bd-4c05-9de9-340ea61332af/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label01.c[11909,11922] [2021-11-23 17:16:16,316 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:16:16,333 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:16:16,406 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_18c28b99-28bd-4c05-9de9-340ea61332af/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label01.c[6354,6367] [2021-11-23 17:16:16,440 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_18c28b99-28bd-4c05-9de9-340ea61332af/sv-benchmarks/c/combinations/pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label01.c[11909,11922] [2021-11-23 17:16:17,354 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:16:17,390 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:16:17,391 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:17 WrapperNode [2021-11-23 17:16:17,391 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:16:17,392 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:16:17,392 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:16:17,393 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:16:17,400 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:17" (1/1) ... [2021-11-23 17:16:17,474 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:17" (1/1) ... [2021-11-23 17:16:17,695 INFO L137 Inliner]: procedures = 34, calls = 19, calls flagged for inlining = 14, calls inlined = 14, statements flattened = 4957 [2021-11-23 17:16:17,696 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:16:17,696 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:16:17,697 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:16:17,697 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:16:17,706 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:17" (1/1) ... [2021-11-23 17:16:17,706 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:17" (1/1) ... [2021-11-23 17:16:17,808 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:17" (1/1) ... [2021-11-23 17:16:17,808 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:17" (1/1) ... [2021-11-23 17:16:18,002 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:17" (1/1) ... [2021-11-23 17:16:18,052 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:17" (1/1) ... [2021-11-23 17:16:18,088 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:17" (1/1) ... [2021-11-23 17:16:18,196 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:16:18,197 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:16:18,198 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:16:18,198 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:16:18,199 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:17" (1/1) ... [2021-11-23 17:16:18,226 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:16:18,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:16:18,292 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:16:18,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:16:18,460 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:16:18,460 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:16:18,460 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:16:18,460 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:16:18,597 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:16:18,599 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:16:49,215 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:16:49,242 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:16:49,242 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 17:16:49,247 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:16:49 BoogieIcfgContainer [2021-11-23 17:16:49,247 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:16:49,250 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:16:49,250 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:16:49,254 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:16:49,255 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:16:14" (1/3) ... [2021-11-23 17:16:49,256 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ce1e6c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:16:49, skipping insertion in model container [2021-11-23 17:16:49,256 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:16:17" (2/3) ... [2021-11-23 17:16:49,256 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ce1e6c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:16:49, skipping insertion in model container [2021-11-23 17:16:49,257 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:16:49" (3/3) ... [2021-11-23 17:16:49,259 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.3.ufo.BOUNDED-6.pals+Problem12_label01.c [2021-11-23 17:16:49,265 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:16:49,266 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 17:16:49,339 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:16:49,349 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 17:16:49,349 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 17:16:49,396 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 17:16:49,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 17:16:49,407 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:49,408 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 17:16:49,409 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:49,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:49,416 INFO L85 PathProgramCache]: Analyzing trace with hash 975463267, now seen corresponding path program 1 times [2021-11-23 17:16:49,433 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:49,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [285641988] [2021-11-23 17:16:49,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:49,435 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:49,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:49,441 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:49,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:16:49,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:49,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 17:16:49,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:49,747 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 17:16:49,748 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:49,749 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:49,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [285641988] [2021-11-23 17:16:49,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [285641988] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:49,750 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:49,751 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:16:49,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401695091] [2021-11-23 17:16:49,753 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:49,769 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 17:16:49,769 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:49,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 17:16:49,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:16:49,821 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 17:16:49,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:49,954 INFO L93 Difference]: Finished difference Result 1734 states and 3292 transitions. [2021-11-23 17:16:49,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 17:16:49,961 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 17:16:49,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:49,987 INFO L225 Difference]: With dead ends: 1734 [2021-11-23 17:16:49,987 INFO L226 Difference]: Without dead ends: 812 [2021-11-23 17:16:49,993 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 17:16:49,997 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 17:16:49,999 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 17:16:50,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 812 states. [2021-11-23 17:16:50,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 812 to 812. [2021-11-23 17:16:50,082 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 17:16:50,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 812 states to 812 states and 1533 transitions. [2021-11-23 17:16:50,089 INFO L78 Accepts]: Start accepts. Automaton has 812 states and 1533 transitions. Word has length 26 [2021-11-23 17:16:50,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:50,090 INFO L470 AbstractCegarLoop]: Abstraction has 812 states and 1533 transitions. [2021-11-23 17:16:50,090 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 17:16:50,090 INFO L276 IsEmpty]: Start isEmpty. Operand 812 states and 1533 transitions. [2021-11-23 17:16:50,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 17:16:50,092 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:50,092 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:16:50,110 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2021-11-23 17:16:50,310 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:50,313 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:50,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:50,315 INFO L85 PathProgramCache]: Analyzing trace with hash 157814817, now seen corresponding path program 1 times [2021-11-23 17:16:50,315 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:50,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [699832919] [2021-11-23 17:16:50,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:50,316 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:50,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:50,317 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:50,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:16:50,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:50,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:16:50,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:50,495 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 17:16:50,495 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:50,495 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:50,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [699832919] [2021-11-23 17:16:50,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [699832919] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:50,496 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:50,496 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:16:50,496 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226770976] [2021-11-23 17:16:50,497 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:50,498 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:16:50,498 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:50,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:16:50,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:16:50,499 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 17:16:50,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:50,639 INFO L93 Difference]: Finished difference Result 888 states and 1649 transitions. [2021-11-23 17:16:50,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:16:50,640 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 17:16:50,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:50,646 INFO L225 Difference]: With dead ends: 888 [2021-11-23 17:16:50,647 INFO L226 Difference]: Without dead ends: 848 [2021-11-23 17:16:50,685 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 17:16:50,687 INFO L933 BasicCegarLoop]: 1529 mSDtfsCounter, 58 mSDsluCounter, 4566 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 6095 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:50,688 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 6095 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:16:50,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 848 states. [2021-11-23 17:16:50,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 848 to 812. [2021-11-23 17:16:50,757 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 17:16:50,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 812 states to 812 states and 1517 transitions. [2021-11-23 17:16:50,763 INFO L78 Accepts]: Start accepts. Automaton has 812 states and 1517 transitions. Word has length 26 [2021-11-23 17:16:50,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:50,763 INFO L470 AbstractCegarLoop]: Abstraction has 812 states and 1517 transitions. [2021-11-23 17:16:50,764 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 17:16:50,764 INFO L276 IsEmpty]: Start isEmpty. Operand 812 states and 1517 transitions. [2021-11-23 17:16:50,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 17:16:50,772 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:50,772 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 17:16:50,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:50,985 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:50,986 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:50,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:50,987 INFO L85 PathProgramCache]: Analyzing trace with hash -1324654887, now seen corresponding path program 1 times [2021-11-23 17:16:50,988 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:50,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1473961424] [2021-11-23 17:16:50,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:50,989 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:50,989 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:50,990 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:50,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:16:51,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:51,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:16:51,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:51,295 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:51,296 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:51,297 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:51,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1473961424] [2021-11-23 17:16:51,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1473961424] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:51,303 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:51,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:16:51,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402912017] [2021-11-23 17:16:51,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:51,306 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:16:51,306 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:51,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:16:51,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:16:51,309 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 17:16:51,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:51,366 INFO L93 Difference]: Finished difference Result 878 states and 1619 transitions. [2021-11-23 17:16:51,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:16:51,367 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 17:16:51,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:51,374 INFO L225 Difference]: With dead ends: 878 [2021-11-23 17:16:51,374 INFO L226 Difference]: Without dead ends: 842 [2021-11-23 17:16:51,375 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 17:16:51,380 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 17:16:51,382 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 17:16:51,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 842 states. [2021-11-23 17:16:51,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 842 to 840. [2021-11-23 17:16:51,418 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 17:16:51,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 840 states to 840 states and 1561 transitions. [2021-11-23 17:16:51,424 INFO L78 Accepts]: Start accepts. Automaton has 840 states and 1561 transitions. Word has length 41 [2021-11-23 17:16:51,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:51,425 INFO L470 AbstractCegarLoop]: Abstraction has 840 states and 1561 transitions. [2021-11-23 17:16:51,425 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 17:16:51,425 INFO L276 IsEmpty]: Start isEmpty. Operand 840 states and 1561 transitions. [2021-11-23 17:16:51,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 17:16:51,432 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:51,432 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 17:16:51,447 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:51,648 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:51,648 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:51,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:51,649 INFO L85 PathProgramCache]: Analyzing trace with hash 1376027727, now seen corresponding path program 1 times [2021-11-23 17:16:51,649 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:51,649 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [414415866] [2021-11-23 17:16:51,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:51,650 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:51,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:51,651 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:51,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:16:51,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:51,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:16:51,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:52,253 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 17:16:52,253 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:52,253 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:52,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [414415866] [2021-11-23 17:16:52,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [414415866] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:52,254 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:52,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:16:52,255 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783352655] [2021-11-23 17:16:52,255 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:52,255 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:16:52,255 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:52,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:16:52,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:16:52,256 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 17:16:52,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:52,417 INFO L93 Difference]: Finished difference Result 1096 states and 1961 transitions. [2021-11-23 17:16:52,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:16:52,418 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 17:16:52,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:52,425 INFO L225 Difference]: With dead ends: 1096 [2021-11-23 17:16:52,425 INFO L226 Difference]: Without dead ends: 1032 [2021-11-23 17:16:52,426 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 17:16:52,427 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 17:16:52,428 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 17:16:52,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1032 states. [2021-11-23 17:16:52,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1032 to 964. [2021-11-23 17:16:52,460 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 17:16:52,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 964 states to 964 states and 1753 transitions. [2021-11-23 17:16:52,466 INFO L78 Accepts]: Start accepts. Automaton has 964 states and 1753 transitions. Word has length 41 [2021-11-23 17:16:52,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:52,467 INFO L470 AbstractCegarLoop]: Abstraction has 964 states and 1753 transitions. [2021-11-23 17:16:52,467 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 17:16:52,467 INFO L276 IsEmpty]: Start isEmpty. Operand 964 states and 1753 transitions. [2021-11-23 17:16:52,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 17:16:52,469 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:52,469 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 17:16:52,486 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:52,682 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:52,683 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:52,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:52,684 INFO L85 PathProgramCache]: Analyzing trace with hash -1902982177, now seen corresponding path program 1 times [2021-11-23 17:16:52,685 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:52,685 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1171267650] [2021-11-23 17:16:52,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:52,689 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:52,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:52,690 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:52,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:16:52,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:52,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:16:52,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:53,006 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 17:16:53,006 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:53,007 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:53,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1171267650] [2021-11-23 17:16:53,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1171267650] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:53,007 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:53,007 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:16:53,007 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619847941] [2021-11-23 17:16:53,008 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:53,008 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:16:53,008 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:53,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:16:53,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:16:53,009 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 17:16:53,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:53,078 INFO L93 Difference]: Finished difference Result 1242 states and 2182 transitions. [2021-11-23 17:16:53,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:16:53,079 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 17:16:53,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:53,088 INFO L225 Difference]: With dead ends: 1242 [2021-11-23 17:16:53,088 INFO L226 Difference]: Without dead ends: 1054 [2021-11-23 17:16:53,089 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 17:16:53,090 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 17:16:53,091 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 17:16:53,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1054 states. [2021-11-23 17:16:53,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1054 to 1052. [2021-11-23 17:16:53,131 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 17:16:53,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1052 states to 1052 states and 1884 transitions. [2021-11-23 17:16:53,138 INFO L78 Accepts]: Start accepts. Automaton has 1052 states and 1884 transitions. Word has length 43 [2021-11-23 17:16:53,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:53,140 INFO L470 AbstractCegarLoop]: Abstraction has 1052 states and 1884 transitions. [2021-11-23 17:16:53,141 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 17:16:53,141 INFO L276 IsEmpty]: Start isEmpty. Operand 1052 states and 1884 transitions. [2021-11-23 17:16:53,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 17:16:53,142 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:53,142 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 17:16:53,157 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:53,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:53,357 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:53,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:53,358 INFO L85 PathProgramCache]: Analyzing trace with hash -47574589, now seen corresponding path program 1 times [2021-11-23 17:16:53,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:53,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [992785290] [2021-11-23 17:16:53,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:53,358 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:53,359 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:53,360 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:53,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:16:53,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:53,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:16:53,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:53,577 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 17:16:53,577 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:53,578 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:53,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [992785290] [2021-11-23 17:16:53,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [992785290] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:53,578 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:53,578 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:16:53,579 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567113952] [2021-11-23 17:16:53,579 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:53,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:16:53,579 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:53,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:16:53,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:16:53,581 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 17:16:53,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:53,634 INFO L93 Difference]: Finished difference Result 1546 states and 2636 transitions. [2021-11-23 17:16:53,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:16:53,635 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 17:16:53,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:53,644 INFO L225 Difference]: With dead ends: 1546 [2021-11-23 17:16:53,644 INFO L226 Difference]: Without dead ends: 1272 [2021-11-23 17:16:53,645 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 17:16:53,650 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 17:16:53,650 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 17:16:53,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1272 states. [2021-11-23 17:16:53,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1272 to 1270. [2021-11-23 17:16:53,697 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 17:16:53,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1270 states to 1270 states and 2205 transitions. [2021-11-23 17:16:53,703 INFO L78 Accepts]: Start accepts. Automaton has 1270 states and 2205 transitions. Word has length 43 [2021-11-23 17:16:53,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:53,704 INFO L470 AbstractCegarLoop]: Abstraction has 1270 states and 2205 transitions. [2021-11-23 17:16:53,705 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 17:16:53,706 INFO L276 IsEmpty]: Start isEmpty. Operand 1270 states and 2205 transitions. [2021-11-23 17:16:53,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 17:16:53,707 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:53,708 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 17:16:53,726 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:53,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:53,921 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:53,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:53,921 INFO L85 PathProgramCache]: Analyzing trace with hash 1199933027, now seen corresponding path program 1 times [2021-11-23 17:16:53,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:53,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [692394726] [2021-11-23 17:16:53,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:53,922 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:53,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:53,923 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:53,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:16:54,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:54,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:16:54,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:54,180 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 17:16:54,181 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:54,181 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:54,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [692394726] [2021-11-23 17:16:54,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [692394726] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:54,181 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:54,181 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:16:54,181 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464538971] [2021-11-23 17:16:54,181 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:54,182 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:16:54,182 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:54,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:16:54,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:16:54,183 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 17:16:54,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:54,247 INFO L93 Difference]: Finished difference Result 2146 states and 3509 transitions. [2021-11-23 17:16:54,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:16:54,247 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 17:16:54,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:54,258 INFO L225 Difference]: With dead ends: 2146 [2021-11-23 17:16:54,258 INFO L226 Difference]: Without dead ends: 1654 [2021-11-23 17:16:54,260 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 17:16:54,261 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 17:16:54,261 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 17:16:54,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1654 states. [2021-11-23 17:16:54,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1654 to 1652. [2021-11-23 17:16:54,323 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 17:16:54,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1652 states to 1652 states and 2748 transitions. [2021-11-23 17:16:54,331 INFO L78 Accepts]: Start accepts. Automaton has 1652 states and 2748 transitions. Word has length 43 [2021-11-23 17:16:54,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:54,332 INFO L470 AbstractCegarLoop]: Abstraction has 1652 states and 2748 transitions. [2021-11-23 17:16:54,332 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 17:16:54,332 INFO L276 IsEmpty]: Start isEmpty. Operand 1652 states and 2748 transitions. [2021-11-23 17:16:54,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 17:16:54,333 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:54,333 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 17:16:54,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:54,555 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:54,556 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:54,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:54,556 INFO L85 PathProgramCache]: Analyzing trace with hash -1511296967, now seen corresponding path program 1 times [2021-11-23 17:16:54,557 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:54,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1225063140] [2021-11-23 17:16:54,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:54,557 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:54,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:54,558 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:54,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:16:54,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:54,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:16:54,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:54,745 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 17:16:54,745 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:54,745 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:54,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1225063140] [2021-11-23 17:16:54,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1225063140] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:54,746 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:54,746 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:16:54,746 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382853288] [2021-11-23 17:16:54,747 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:54,747 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:16:54,747 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:54,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:16:54,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:16:54,748 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 17:16:54,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:54,968 INFO L93 Difference]: Finished difference Result 2498 states and 3940 transitions. [2021-11-23 17:16:54,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:16:54,969 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 17:16:54,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:54,987 INFO L225 Difference]: With dead ends: 2498 [2021-11-23 17:16:54,988 INFO L226 Difference]: Without dead ends: 2496 [2021-11-23 17:16:54,989 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 17:16:54,990 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 17:16:54,991 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 17:16:54,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2496 states. [2021-11-23 17:16:55,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2496 to 1736. [2021-11-23 17:16:55,092 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 17:16:55,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1736 states to 1736 states and 2828 transitions. [2021-11-23 17:16:55,102 INFO L78 Accepts]: Start accepts. Automaton has 1736 states and 2828 transitions. Word has length 44 [2021-11-23 17:16:55,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:55,102 INFO L470 AbstractCegarLoop]: Abstraction has 1736 states and 2828 transitions. [2021-11-23 17:16:55,102 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 17:16:55,103 INFO L276 IsEmpty]: Start isEmpty. Operand 1736 states and 2828 transitions. [2021-11-23 17:16:55,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 17:16:55,103 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:55,104 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] [2021-11-23 17:16:55,119 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:55,319 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:55,319 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:55,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:55,320 INFO L85 PathProgramCache]: Analyzing trace with hash -105607243, now seen corresponding path program 1 times [2021-11-23 17:16:55,321 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:55,321 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1751663210] [2021-11-23 17:16:55,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:55,321 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:55,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:55,322 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:55,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:16:55,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:55,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:16:55,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:55,563 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 17:16:55,563 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:55,563 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:55,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1751663210] [2021-11-23 17:16:55,563 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1751663210] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:55,563 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:55,563 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:16:55,564 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964670906] [2021-11-23 17:16:55,564 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:55,564 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:16:55,564 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:55,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:16:55,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:16:55,565 INFO L87 Difference]: Start difference. First operand 1736 states and 2828 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 2 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:33,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:33,612 INFO L93 Difference]: Finished difference Result 3240 states and 5701 transitions. [2021-11-23 17:17:33,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:17:33,612 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 2 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-23 17:17:33,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:33,630 INFO L225 Difference]: With dead ends: 3240 [2021-11-23 17:17:33,630 INFO L226 Difference]: Without dead ends: 2487 [2021-11-23 17:17:33,632 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 46 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 17:17:33,633 INFO L933 BasicCegarLoop]: 295 mSDtfsCounter, 809 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2464 mSolverCounterSat, 512 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 31.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 809 SdHoareTripleChecker+Valid, 302 SdHoareTripleChecker+Invalid, 2976 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 512 IncrementalHoareTripleChecker+Valid, 2464 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 37.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:33,634 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [809 Valid, 302 Invalid, 2976 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [512 Valid, 2464 Invalid, 0 Unknown, 0 Unchecked, 37.9s Time] [2021-11-23 17:17:33,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2487 states. [2021-11-23 17:17:33,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2487 to 2487. [2021-11-23 17:17:33,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2487 states, 2485 states have (on average 1.633400402414487) internal successors, (4059), 2486 states have internal predecessors, (4059), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:33,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2487 states to 2487 states and 4059 transitions. [2021-11-23 17:17:33,755 INFO L78 Accepts]: Start accepts. Automaton has 2487 states and 4059 transitions. Word has length 48 [2021-11-23 17:17:33,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:33,756 INFO L470 AbstractCegarLoop]: Abstraction has 2487 states and 4059 transitions. [2021-11-23 17:17:33,756 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 2 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:33,756 INFO L276 IsEmpty]: Start isEmpty. Operand 2487 states and 4059 transitions. [2021-11-23 17:17:33,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:17:33,758 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:33,758 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 17:17:33,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:33,959 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:17:33,960 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:33,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:33,961 INFO L85 PathProgramCache]: Analyzing trace with hash -213997176, now seen corresponding path program 1 times [2021-11-23 17:17:33,961 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:33,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1269224832] [2021-11-23 17:17:33,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:33,961 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:33,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:33,963 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:34,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:17:34,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:34,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:17:34,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:35,440 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 17:17:35,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:36,422 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 17:17:36,422 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:36,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1269224832] [2021-11-23 17:17:36,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1269224832] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:36,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1162972104] [2021-11-23 17:17:36,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:36,423 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:36,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:36,425 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:36,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-11-23 17:17:36,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:36,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:17:36,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:36,707 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 17:17:36,708 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:17:36,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1162972104] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:17:36,708 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:17:36,708 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 17:17:36,708 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050556574] [2021-11-23 17:17:36,708 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:17:36,709 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:17:36,709 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:36,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:17:36,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:17:36,710 INFO L87 Difference]: Start difference. First operand 2487 states and 4059 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 17:17:36,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:36,779 INFO L93 Difference]: Finished difference Result 3447 states and 5425 transitions. [2021-11-23 17:17:36,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:17:36,779 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 17:17:36,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:36,794 INFO L225 Difference]: With dead ends: 3447 [2021-11-23 17:17:36,794 INFO L226 Difference]: Without dead ends: 2489 [2021-11-23 17:17:36,796 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 17:17:36,797 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 17:17:36,798 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 17:17:36,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2489 states. [2021-11-23 17:17:36,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2489 to 2487. [2021-11-23 17:17:36,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2487 states, 2485 states have (on average 1.6261569416498993) internal successors, (4041), 2486 states have internal predecessors, (4041), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:36,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2487 states to 2487 states and 4041 transitions. [2021-11-23 17:17:36,889 INFO L78 Accepts]: Start accepts. Automaton has 2487 states and 4041 transitions. Word has length 64 [2021-11-23 17:17:36,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:36,890 INFO L470 AbstractCegarLoop]: Abstraction has 2487 states and 4041 transitions. [2021-11-23 17:17:36,890 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 17:17:36,890 INFO L276 IsEmpty]: Start isEmpty. Operand 2487 states and 4041 transitions. [2021-11-23 17:17:36,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:17:36,891 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:36,892 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 17:17:36,898 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:37,109 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:37,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:17:37,302 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:37,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:37,302 INFO L85 PathProgramCache]: Analyzing trace with hash 1584307858, now seen corresponding path program 1 times [2021-11-23 17:17:37,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:37,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1602133809] [2021-11-23 17:17:37,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:37,303 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:37,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:37,304 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:37,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 17:17:37,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:37,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:17:37,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:38,661 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 17:17:38,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:39,456 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 17:17:39,456 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:39,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1602133809] [2021-11-23 17:17:39,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1602133809] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:39,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [291612873] [2021-11-23 17:17:39,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:39,457 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:39,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:39,464 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:39,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-23 17:17:39,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:39,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:17:39,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:40,510 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 17:17:40,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:41,103 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 17:17:41,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [291612873] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:41,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [398854417] [2021-11-23 17:17:41,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:41,104 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:41,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:17:41,105 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:17:41,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 17:17:41,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:41,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:17:41,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:41,994 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 17:17:41,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:42,578 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 17:17:42,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [398854417] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:42,579 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:17:42,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:17:42,579 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629611091] [2021-11-23 17:17:42,579 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:17:42,580 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:17:42,580 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:42,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:17:42,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:17:42,581 INFO L87 Difference]: Start difference. First operand 2487 states and 4041 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 17:17:43,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:43,011 INFO L93 Difference]: Finished difference Result 3184 states and 5031 transitions. [2021-11-23 17:17:43,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:17:43,012 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 17:17:43,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:43,030 INFO L225 Difference]: With dead ends: 3184 [2021-11-23 17:17:43,030 INFO L226 Difference]: Without dead ends: 2510 [2021-11-23 17:17:43,033 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 364 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:17:43,033 INFO L933 BasicCegarLoop]: 1502 mSDtfsCounter, 7275 mSDsluCounter, 11947 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7275 SdHoareTripleChecker+Valid, 13449 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 49 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:43,034 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7275 Valid, 13449 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 46 Invalid, 0 Unknown, 49 Unchecked, 0.1s Time] [2021-11-23 17:17:43,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2510 states. [2021-11-23 17:17:43,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2510 to 2509. [2021-11-23 17:17:43,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2509 states, 2507 states have (on average 1.6222576785001994) internal successors, (4067), 2508 states have internal predecessors, (4067), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:43,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2509 states to 2509 states and 4067 transitions. [2021-11-23 17:17:43,183 INFO L78 Accepts]: Start accepts. Automaton has 2509 states and 4067 transitions. Word has length 64 [2021-11-23 17:17:43,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:43,184 INFO L470 AbstractCegarLoop]: Abstraction has 2509 states and 4067 transitions. [2021-11-23 17:17:43,184 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 17:17:43,184 INFO L276 IsEmpty]: Start isEmpty. Operand 2509 states and 4067 transitions. [2021-11-23 17:17:43,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:17:43,186 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:43,186 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 17:17:43,201 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:43,423 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:43,603 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Ended with exit code 0 [2021-11-23 17:17:43,801 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:43,802 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:43,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:43,802 INFO L85 PathProgramCache]: Analyzing trace with hash -2129817016, now seen corresponding path program 1 times [2021-11-23 17:17:43,802 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:43,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2072880885] [2021-11-23 17:17:43,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:43,803 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:43,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:43,804 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:43,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 17:17:43,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:43,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:17:43,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:45,378 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 17:17:45,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:45,949 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 17:17:45,949 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:45,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2072880885] [2021-11-23 17:17:45,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2072880885] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:45,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1072870006] [2021-11-23 17:17:45,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:45,950 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:45,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:45,951 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:45,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-23 17:17:46,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:46,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:17:46,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:46,209 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 17:17:46,209 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:17:46,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1072870006] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:17:46,210 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:17:46,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 17:17:46,210 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789604832] [2021-11-23 17:17:46,210 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:17:46,211 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:17:46,211 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:46,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:17:46,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:17:46,211 INFO L87 Difference]: Start difference. First operand 2509 states and 4067 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 17:17:46,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:46,313 INFO L93 Difference]: Finished difference Result 2991 states and 4742 transitions. [2021-11-23 17:17:46,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:17:46,314 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 17:17:46,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:46,328 INFO L225 Difference]: With dead ends: 2991 [2021-11-23 17:17:46,328 INFO L226 Difference]: Without dead ends: 2033 [2021-11-23 17:17:46,330 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 17:17:46,331 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 17:17:46,332 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 17:17:46,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2033 states. [2021-11-23 17:17:46,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2033 to 2031. [2021-11-23 17:17:46,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2031 states, 2029 states have (on average 1.6683095120749138) internal successors, (3385), 2030 states have internal predecessors, (3385), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:46,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2031 states to 2031 states and 3385 transitions. [2021-11-23 17:17:46,404 INFO L78 Accepts]: Start accepts. Automaton has 2031 states and 3385 transitions. Word has length 64 [2021-11-23 17:17:46,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:46,404 INFO L470 AbstractCegarLoop]: Abstraction has 2031 states and 3385 transitions. [2021-11-23 17:17:46,404 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 17:17:46,405 INFO L276 IsEmpty]: Start isEmpty. Operand 2031 states and 3385 transitions. [2021-11-23 17:17:46,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:17:46,406 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:46,406 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 17:17:46,421 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:46,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:46,823 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:46,823 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:46,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:46,824 INFO L85 PathProgramCache]: Analyzing trace with hash 947164882, now seen corresponding path program 1 times [2021-11-23 17:17:46,824 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:46,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1704033257] [2021-11-23 17:17:46,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:46,824 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:46,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:46,825 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:46,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 17:17:46,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:46,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:17:46,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:48,537 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 17:17:48,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:49,081 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 17:17:49,081 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:49,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1704033257] [2021-11-23 17:17:49,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1704033257] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:49,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2118803726] [2021-11-23 17:17:49,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:49,081 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:49,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:49,082 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:49,084 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-23 17:17:49,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:49,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:17:49,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:50,400 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 17:17:50,401 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:50,721 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 17:17:50,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2118803726] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:50,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1625202282] [2021-11-23 17:17:50,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:50,722 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:50,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:17:50,723 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:17:50,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 17:17:50,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:50,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:17:50,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:52,056 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 17:17:52,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:52,416 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 17:17:52,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1625202282] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:52,417 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:17:52,417 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:17:52,417 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700673815] [2021-11-23 17:17:52,418 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:17:52,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:17:52,419 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:52,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:17:52,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:17:52,420 INFO L87 Difference]: Start difference. First operand 2031 states and 3385 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 17:17:52,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:52,719 INFO L93 Difference]: Finished difference Result 2406 states and 3906 transitions. [2021-11-23 17:17:52,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:17:52,720 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 17:17:52,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:52,731 INFO L225 Difference]: With dead ends: 2406 [2021-11-23 17:17:52,732 INFO L226 Difference]: Without dead ends: 2068 [2021-11-23 17:17:52,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 364 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:17:52,734 INFO L933 BasicCegarLoop]: 1501 mSDtfsCounter, 5837 mSDsluCounter, 10590 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5837 SdHoareTripleChecker+Valid, 12091 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 123 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:52,734 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5837 Valid, 12091 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 64 Invalid, 0 Unknown, 123 Unchecked, 0.1s Time] [2021-11-23 17:17:52,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2068 states. [2021-11-23 17:17:52,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2068 to 2041. [2021-11-23 17:17:52,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2041 states, 2039 states have (on average 1.6660127513487004) internal successors, (3397), 2040 states have internal predecessors, (3397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:52,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2041 states to 2041 states and 3397 transitions. [2021-11-23 17:17:52,797 INFO L78 Accepts]: Start accepts. Automaton has 2041 states and 3397 transitions. Word has length 64 [2021-11-23 17:17:52,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:52,798 INFO L470 AbstractCegarLoop]: Abstraction has 2041 states and 3397 transitions. [2021-11-23 17:17:52,798 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 17:17:52,798 INFO L276 IsEmpty]: Start isEmpty. Operand 2041 states and 3397 transitions. [2021-11-23 17:17:52,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:17:52,799 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:52,799 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 17:17:52,802 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Ended with exit code 0 [2021-11-23 17:17:53,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:53,221 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:53,402 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:53,402 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:53,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:53,402 INFO L85 PathProgramCache]: Analyzing trace with hash -1514914168, now seen corresponding path program 1 times [2021-11-23 17:17:53,403 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:53,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [141421598] [2021-11-23 17:17:53,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:53,403 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:53,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:53,404 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:53,409 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 17:17:53,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:53,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:17:53,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:53,635 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 17:17:53,635 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:17:53,635 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:53,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [141421598] [2021-11-23 17:17:53,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [141421598] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:17:53,636 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:17:53,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:17:53,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2039208463] [2021-11-23 17:17:53,636 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:17:53,636 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:17:53,637 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:53,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:17:53,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:17:53,638 INFO L87 Difference]: Start difference. First operand 2041 states and 3397 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 17:17:53,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:53,704 INFO L93 Difference]: Finished difference Result 2233 states and 3659 transitions. [2021-11-23 17:17:53,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:17:53,705 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 17:17:53,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:53,729 INFO L225 Difference]: With dead ends: 2233 [2021-11-23 17:17:53,735 INFO L226 Difference]: Without dead ends: 1753 [2021-11-23 17:17:53,737 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 17:17:53,738 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 17:17:53,738 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 17:17:53,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1753 states. [2021-11-23 17:17:53,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1753 to 1745. [2021-11-23 17:17:53,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1745 states, 1743 states have (on average 1.7108433734939759) internal successors, (2982), 1744 states have internal predecessors, (2982), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:53,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1745 states to 1745 states and 2982 transitions. [2021-11-23 17:17:53,817 INFO L78 Accepts]: Start accepts. Automaton has 1745 states and 2982 transitions. Word has length 64 [2021-11-23 17:17:53,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:53,817 INFO L470 AbstractCegarLoop]: Abstraction has 1745 states and 2982 transitions. [2021-11-23 17:17:53,819 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 17:17:53,819 INFO L276 IsEmpty]: Start isEmpty. Operand 1745 states and 2982 transitions. [2021-11-23 17:17:53,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:17:53,820 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:53,820 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 17:17:53,839 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:54,040 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:17:54,040 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:54,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:54,040 INFO L85 PathProgramCache]: Analyzing trace with hash -2009059564, now seen corresponding path program 1 times [2021-11-23 17:17:54,041 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:54,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1263998703] [2021-11-23 17:17:54,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:54,041 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:54,041 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:54,043 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:54,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:17:54,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:54,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:17:54,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:54,634 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 17:17:54,634 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:17:54,634 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:54,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1263998703] [2021-11-23 17:17:54,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1263998703] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:17:54,635 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:17:54,635 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:17:54,635 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662511692] [2021-11-23 17:17:54,635 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:17:54,635 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:17:54,636 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:54,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:17:54,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:17:54,636 INFO L87 Difference]: Start difference. First operand 1745 states and 2982 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 17:17:54,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:54,715 INFO L93 Difference]: Finished difference Result 1921 states and 3223 transitions. [2021-11-23 17:17:54,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:17:54,716 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 17:17:54,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:54,721 INFO L225 Difference]: With dead ends: 1921 [2021-11-23 17:17:54,721 INFO L226 Difference]: Without dead ends: 1745 [2021-11-23 17:17:54,722 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 17:17:54,723 INFO L933 BasicCegarLoop]: 1506 mSDtfsCounter, 2899 mSDsluCounter, 1510 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2899 SdHoareTripleChecker+Valid, 3016 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 17:17:54,723 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2899 Valid, 3016 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 13 Invalid, 0 Unknown, 14 Unchecked, 0.0s Time] [2021-11-23 17:17:54,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1745 states. [2021-11-23 17:17:54,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1745 to 1745. [2021-11-23 17:17:54,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1745 states, 1743 states have (on average 1.7102696500286863) internal successors, (2981), 1744 states have internal predecessors, (2981), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:54,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1745 states to 1745 states and 2981 transitions. [2021-11-23 17:17:54,781 INFO L78 Accepts]: Start accepts. Automaton has 1745 states and 2981 transitions. Word has length 64 [2021-11-23 17:17:54,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:54,781 INFO L470 AbstractCegarLoop]: Abstraction has 1745 states and 2981 transitions. [2021-11-23 17:17:54,781 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 17:17:54,782 INFO L276 IsEmpty]: Start isEmpty. Operand 1745 states and 2981 transitions. [2021-11-23 17:17:54,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:17:54,783 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:54,783 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 17:17:54,797 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:54,997 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:17:54,997 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:54,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:54,998 INFO L85 PathProgramCache]: Analyzing trace with hash 740302356, now seen corresponding path program 1 times [2021-11-23 17:17:54,999 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:54,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1113385313] [2021-11-23 17:17:54,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:54,999 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:55,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:55,000 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:55,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 17:17:55,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:55,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:17:55,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:55,466 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 17:17:55,466 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:17:55,466 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:55,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1113385313] [2021-11-23 17:17:55,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1113385313] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:17:55,466 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:17:55,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:17:55,467 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531703237] [2021-11-23 17:17:55,467 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:17:55,467 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:17:55,467 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:55,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:17:55,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:17:55,467 INFO L87 Difference]: Start difference. First operand 1745 states and 2981 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 17:17:55,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:55,551 INFO L93 Difference]: Finished difference Result 1925 states and 3227 transitions. [2021-11-23 17:17:55,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:17:55,552 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 17:17:55,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:55,555 INFO L225 Difference]: With dead ends: 1925 [2021-11-23 17:17:55,555 INFO L226 Difference]: Without dead ends: 1745 [2021-11-23 17:17:55,556 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 17:17:55,557 INFO L933 BasicCegarLoop]: 1509 mSDtfsCounter, 1454 mSDsluCounter, 1570 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1454 SdHoareTripleChecker+Valid, 3079 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:55,557 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1454 Valid, 3079 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 26 Unchecked, 0.0s Time] [2021-11-23 17:17:55,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1745 states. [2021-11-23 17:17:55,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1745 to 1745. [2021-11-23 17:17:55,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1745 states, 1743 states have (on average 1.7096959265633964) internal successors, (2980), 1744 states have internal predecessors, (2980), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:55,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1745 states to 1745 states and 2980 transitions. [2021-11-23 17:17:55,610 INFO L78 Accepts]: Start accepts. Automaton has 1745 states and 2980 transitions. Word has length 64 [2021-11-23 17:17:55,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:55,610 INFO L470 AbstractCegarLoop]: Abstraction has 1745 states and 2980 transitions. [2021-11-23 17:17:55,610 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 17:17:55,611 INFO L276 IsEmpty]: Start isEmpty. Operand 1745 states and 2980 transitions. [2021-11-23 17:17:55,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:17:55,611 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:55,612 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 17:17:55,628 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:55,822 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:17:55,823 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:55,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:55,823 INFO L85 PathProgramCache]: Analyzing trace with hash -261059308, now seen corresponding path program 1 times [2021-11-23 17:17:55,824 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:55,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [855007659] [2021-11-23 17:17:55,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:55,824 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:55,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:55,825 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:55,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:17:55,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:55,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:17:55,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:56,418 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 17:17:56,418 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:17:56,419 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:56,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [855007659] [2021-11-23 17:17:56,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [855007659] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:17:56,419 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:17:56,419 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:17:56,419 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115916370] [2021-11-23 17:17:56,420 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:17:56,420 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:17:56,420 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:56,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:17:56,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:17:56,421 INFO L87 Difference]: Start difference. First operand 1745 states and 2980 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 17:17:56,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:56,575 INFO L93 Difference]: Finished difference Result 1915 states and 3215 transitions. [2021-11-23 17:17:56,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:17:56,575 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 17:17:56,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:56,578 INFO L225 Difference]: With dead ends: 1915 [2021-11-23 17:17:56,578 INFO L226 Difference]: Without dead ends: 1731 [2021-11-23 17:17:56,579 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 17:17:56,579 INFO L933 BasicCegarLoop]: 1512 mSDtfsCounter, 1457 mSDsluCounter, 3008 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1457 SdHoareTripleChecker+Valid, 4520 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:56,580 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1457 Valid, 4520 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 29 Unchecked, 0.1s Time] [2021-11-23 17:17:56,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1731 states. [2021-11-23 17:17:56,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1731 to 1731. [2021-11-23 17:17:56,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1731 states, 1729 states have (on average 1.7137073452862928) internal successors, (2963), 1730 states have internal predecessors, (2963), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:56,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1731 states to 1731 states and 2963 transitions. [2021-11-23 17:17:56,621 INFO L78 Accepts]: Start accepts. Automaton has 1731 states and 2963 transitions. Word has length 64 [2021-11-23 17:17:56,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:56,622 INFO L470 AbstractCegarLoop]: Abstraction has 1731 states and 2963 transitions. [2021-11-23 17:17:56,622 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 17:17:56,622 INFO L276 IsEmpty]: Start isEmpty. Operand 1731 states and 2963 transitions. [2021-11-23 17:17:56,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 17:17:56,623 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:56,623 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 17:17:56,639 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:56,835 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:17:56,836 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:56,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:56,836 INFO L85 PathProgramCache]: Analyzing trace with hash -2023735102, now seen corresponding path program 1 times [2021-11-23 17:17:56,853 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:56,853 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1685357248] [2021-11-23 17:17:56,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:56,854 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:56,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:56,855 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:56,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 17:17:56,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:56,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:17:56,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:58,284 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 17:17:58,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:58,945 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 17:17:58,945 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:58,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1685357248] [2021-11-23 17:17:58,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1685357248] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:58,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [679782135] [2021-11-23 17:17:58,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:58,946 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:58,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:58,947 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:58,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-23 17:17:59,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:59,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:17:59,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:00,400 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 17:18:00,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:00,805 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 17:18:00,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [679782135] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:00,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1363307806] [2021-11-23 17:18:00,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:00,805 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:00,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:00,806 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:00,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-23 17:18:00,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:00,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:18:00,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:02,262 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 17:18:02,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:02,726 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 17:18:02,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1363307806] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:02,727 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:02,727 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:18:02,727 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16625191] [2021-11-23 17:18:02,727 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:02,728 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:18:02,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:02,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:18:02,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:18:02,729 INFO L87 Difference]: Start difference. First operand 1731 states and 2963 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 17:18:02,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:02,994 INFO L93 Difference]: Finished difference Result 1913 states and 3216 transitions. [2021-11-23 17:18:02,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:18:02,994 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 17:18:02,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:02,997 INFO L225 Difference]: With dead ends: 1913 [2021-11-23 17:18:02,997 INFO L226 Difference]: Without dead ends: 1743 [2021-11-23 17:18:02,998 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 370 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:18:02,998 INFO L933 BasicCegarLoop]: 1500 mSDtfsCounter, 4383 mSDsluCounter, 10515 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4383 SdHoareTripleChecker+Valid, 12015 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 46 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:02,999 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4383 Valid, 12015 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 46 Invalid, 0 Unknown, 46 Unchecked, 0.1s Time] [2021-11-23 17:18:03,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1743 states. [2021-11-23 17:18:03,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1743 to 1743. [2021-11-23 17:18:03,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1743 states, 1741 states have (on average 1.711085582998277) internal successors, (2979), 1742 states have internal predecessors, (2979), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:03,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1743 states to 1743 states and 2979 transitions. [2021-11-23 17:18:03,042 INFO L78 Accepts]: Start accepts. Automaton has 1743 states and 2979 transitions. Word has length 65 [2021-11-23 17:18:03,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:03,043 INFO L470 AbstractCegarLoop]: Abstraction has 1743 states and 2979 transitions. [2021-11-23 17:18:03,043 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 17:18:03,043 INFO L276 IsEmpty]: Start isEmpty. Operand 1743 states and 2979 transitions. [2021-11-23 17:18:03,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 17:18:03,044 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:03,044 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 17:18:03,053 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:03,248 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:03,467 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:03,647 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:03,647 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:03,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:03,647 INFO L85 PathProgramCache]: Analyzing trace with hash -94088951, now seen corresponding path program 1 times [2021-11-23 17:18:03,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:03,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [616117305] [2021-11-23 17:18:03,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:03,648 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:03,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:03,649 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:03,651 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 17:18:03,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:03,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:18:03,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:04,213 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 17:18:04,213 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:04,214 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:04,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [616117305] [2021-11-23 17:18:04,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [616117305] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:04,214 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:04,214 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:18:04,214 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526273262] [2021-11-23 17:18:04,214 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:04,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:18:04,215 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:04,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:18:04,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:18:04,216 INFO L87 Difference]: Start difference. First operand 1743 states and 2979 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 17:18:04,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:04,433 INFO L93 Difference]: Finished difference Result 1979 states and 3301 transitions. [2021-11-23 17:18:04,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:18:04,435 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 17:18:04,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:04,440 INFO L225 Difference]: With dead ends: 1979 [2021-11-23 17:18:04,440 INFO L226 Difference]: Without dead ends: 1809 [2021-11-23 17:18:04,441 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 17:18:04,442 INFO L933 BasicCegarLoop]: 1569 mSDtfsCounter, 3062 mSDsluCounter, 1600 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3062 SdHoareTripleChecker+Valid, 3169 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:04,443 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3062 Valid, 3169 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 17:18:04,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1809 states. [2021-11-23 17:18:04,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1809 to 1743. [2021-11-23 17:18:04,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1743 states, 1741 states have (on average 1.7076392877656519) internal successors, (2973), 1742 states have internal predecessors, (2973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:04,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1743 states to 1743 states and 2973 transitions. [2021-11-23 17:18:04,496 INFO L78 Accepts]: Start accepts. Automaton has 1743 states and 2973 transitions. Word has length 66 [2021-11-23 17:18:04,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:04,497 INFO L470 AbstractCegarLoop]: Abstraction has 1743 states and 2973 transitions. [2021-11-23 17:18:04,497 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 17:18:04,497 INFO L276 IsEmpty]: Start isEmpty. Operand 1743 states and 2973 transitions. [2021-11-23 17:18:04,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 17:18:04,498 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:04,498 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 17:18:04,518 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:04,713 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:04,713 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:04,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:04,714 INFO L85 PathProgramCache]: Analyzing trace with hash 1408270156, now seen corresponding path program 1 times [2021-11-23 17:18:04,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:04,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [294813483] [2021-11-23 17:18:04,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:04,714 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:04,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:04,716 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:04,718 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 17:18:04,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:04,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:18:04,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:05,368 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 17:18:05,369 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:05,369 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:05,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [294813483] [2021-11-23 17:18:05,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [294813483] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:05,369 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:05,370 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:18:05,370 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474356143] [2021-11-23 17:18:05,370 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:05,371 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:18:05,371 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:05,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:18:05,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:18:05,372 INFO L87 Difference]: Start difference. First operand 1743 states and 2973 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 17:18:05,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:05,506 INFO L93 Difference]: Finished difference Result 1923 states and 3221 transitions. [2021-11-23 17:18:05,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:18:05,506 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 17:18:05,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:05,512 INFO L225 Difference]: With dead ends: 1923 [2021-11-23 17:18:05,512 INFO L226 Difference]: Without dead ends: 1865 [2021-11-23 17:18:05,513 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 17:18:05,514 INFO L933 BasicCegarLoop]: 1575 mSDtfsCounter, 1601 mSDsluCounter, 1645 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1601 SdHoareTripleChecker+Valid, 3220 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:05,515 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1601 Valid, 3220 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:18:05,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1865 states. [2021-11-23 17:18:05,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1865 to 1803. [2021-11-23 17:18:05,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1803 states, 1801 states have (on average 1.694058856191005) internal successors, (3051), 1802 states have internal predecessors, (3051), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:05,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1803 states to 1803 states and 3051 transitions. [2021-11-23 17:18:05,570 INFO L78 Accepts]: Start accepts. Automaton has 1803 states and 3051 transitions. Word has length 66 [2021-11-23 17:18:05,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:05,570 INFO L470 AbstractCegarLoop]: Abstraction has 1803 states and 3051 transitions. [2021-11-23 17:18:05,570 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 17:18:05,571 INFO L276 IsEmpty]: Start isEmpty. Operand 1803 states and 3051 transitions. [2021-11-23 17:18:05,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 17:18:05,572 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:05,572 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 17:18:05,591 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:05,787 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:05,788 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:05,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:05,788 INFO L85 PathProgramCache]: Analyzing trace with hash 52806377, now seen corresponding path program 1 times [2021-11-23 17:18:05,788 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:05,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1616708047] [2021-11-23 17:18:05,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:05,789 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:05,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:05,791 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:05,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 17:18:05,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:05,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:18:05,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:06,441 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 17:18:06,441 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:06,441 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:06,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1616708047] [2021-11-23 17:18:06,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1616708047] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:06,442 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:06,442 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:18:06,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608880892] [2021-11-23 17:18:06,442 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:06,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:18:06,443 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:06,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:18:06,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:18:06,443 INFO L87 Difference]: Start difference. First operand 1803 states and 3051 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 17:18:06,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:06,580 INFO L93 Difference]: Finished difference Result 1983 states and 3299 transitions. [2021-11-23 17:18:06,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:18:06,581 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 17:18:06,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:06,587 INFO L225 Difference]: With dead ends: 1983 [2021-11-23 17:18:06,587 INFO L226 Difference]: Without dead ends: 1925 [2021-11-23 17:18:06,588 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 17:18:06,589 INFO L933 BasicCegarLoop]: 1572 mSDtfsCounter, 1596 mSDsluCounter, 1649 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1596 SdHoareTripleChecker+Valid, 3221 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:06,590 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1596 Valid, 3221 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:18:06,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1925 states. [2021-11-23 17:18:06,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1925 to 1863. [2021-11-23 17:18:06,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1863 states, 1861 states have (on average 1.6813541106931758) internal successors, (3129), 1862 states have internal predecessors, (3129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:06,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1863 states to 1863 states and 3129 transitions. [2021-11-23 17:18:06,650 INFO L78 Accepts]: Start accepts. Automaton has 1863 states and 3129 transitions. Word has length 66 [2021-11-23 17:18:06,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:06,651 INFO L470 AbstractCegarLoop]: Abstraction has 1863 states and 3129 transitions. [2021-11-23 17:18:06,651 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 17:18:06,651 INFO L276 IsEmpty]: Start isEmpty. Operand 1863 states and 3129 transitions. [2021-11-23 17:18:06,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 17:18:06,655 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:06,655 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 17:18:06,670 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:06,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:06,870 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:06,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:06,871 INFO L85 PathProgramCache]: Analyzing trace with hash -791645332, now seen corresponding path program 1 times [2021-11-23 17:18:06,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:06,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [814117238] [2021-11-23 17:18:06,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:06,872 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:06,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:06,873 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:06,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 17:18:06,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:06,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:18:06,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:10,363 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 17:18:10,363 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:12,776 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 17:18:12,776 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:12,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [814117238] [2021-11-23 17:18:12,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [814117238] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:12,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1049028915] [2021-11-23 17:18:12,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:12,777 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:12,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:12,778 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:12,779 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-23 17:18:12,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:12,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:18:12,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:15,541 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 17:18:15,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:16,447 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 17:18:16,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1049028915] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:16,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146429151] [2021-11-23 17:18:16,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:16,448 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:16,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:16,448 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:16,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-23 17:18:16,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:16,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:18:16,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:20,424 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 17:18:20,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:21,569 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 17:18:21,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [146429151] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:21,570 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:21,570 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 22, 20, 18, 17] total 56 [2021-11-23 17:18:21,570 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847015172] [2021-11-23 17:18:21,570 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:21,571 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-23 17:18:21,571 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:21,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-23 17:18:21,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=2714, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 17:18:21,574 INFO L87 Difference]: Start difference. First operand 1863 states and 3129 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 17:18:22,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:22,569 INFO L93 Difference]: Finished difference Result 2110 states and 3446 transitions. [2021-11-23 17:18:22,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-23 17:18:22,572 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 17:18:22,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:22,577 INFO L225 Difference]: With dead ends: 2110 [2021-11-23 17:18:22,577 INFO L226 Difference]: Without dead ends: 1992 [2021-11-23 17:18:22,580 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 344 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1316 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=465, Invalid=3075, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 17:18:22,581 INFO L933 BasicCegarLoop]: 1520 mSDtfsCounter, 10259 mSDsluCounter, 24311 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10259 SdHoareTripleChecker+Valid, 25831 SdHoareTripleChecker+Invalid, 371 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 169 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:22,582 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10259 Valid, 25831 Invalid, 371 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 188 Invalid, 0 Unknown, 169 Unchecked, 0.3s Time] [2021-11-23 17:18:22,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1992 states. [2021-11-23 17:18:22,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1992 to 1869. [2021-11-23 17:18:22,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1869 states, 1867 states have (on average 1.679700053561864) internal successors, (3136), 1868 states have internal predecessors, (3136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:22,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1869 states to 1869 states and 3136 transitions. [2021-11-23 17:18:22,670 INFO L78 Accepts]: Start accepts. Automaton has 1869 states and 3136 transitions. Word has length 67 [2021-11-23 17:18:22,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:22,670 INFO L470 AbstractCegarLoop]: Abstraction has 1869 states and 3136 transitions. [2021-11-23 17:18:22,671 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 17:18:22,671 INFO L276 IsEmpty]: Start isEmpty. Operand 1869 states and 3136 transitions. [2021-11-23 17:18:22,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 17:18:22,672 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:22,672 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 17:18:22,712 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:22,897 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:23,088 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (32)] Ended with exit code 0 [2021-11-23 17:18:23,287 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:23,287 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:23,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:23,287 INFO L85 PathProgramCache]: Analyzing trace with hash 138650479, now seen corresponding path program 1 times [2021-11-23 17:18:23,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:23,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1000198035] [2021-11-23 17:18:23,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:23,288 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:23,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:23,289 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:23,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-23 17:18:23,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:23,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:18:23,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:26,080 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 17:18:26,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:27,719 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 17:18:27,719 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:27,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1000198035] [2021-11-23 17:18:27,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1000198035] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:27,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [767904332] [2021-11-23 17:18:27,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:27,720 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:27,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:27,721 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:27,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-11-23 17:18:27,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:27,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:18:27,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:30,207 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 17:18:30,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:30,949 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 17:18:30,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [767904332] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:30,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [459448793] [2021-11-23 17:18:30,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:30,949 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:30,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:30,950 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:30,951 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-23 17:18:31,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:31,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:18:31,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:34,076 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 17:18:34,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:35,522 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 17:18:35,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [459448793] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:35,522 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:35,522 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 20, 18, 18, 18] total 55 [2021-11-23 17:18:35,523 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776887287] [2021-11-23 17:18:35,523 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:35,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 17:18:35,524 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:35,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 17:18:35,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=2600, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:18:35,526 INFO L87 Difference]: Start difference. First operand 1869 states and 3136 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 17:18:36,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:36,733 INFO L93 Difference]: Finished difference Result 2118 states and 3453 transitions. [2021-11-23 17:18:36,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 17:18:36,734 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 17:18:36,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:36,737 INFO L225 Difference]: With dead ends: 2118 [2021-11-23 17:18:36,737 INFO L226 Difference]: Without dead ends: 1990 [2021-11-23 17:18:36,740 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 345 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1405 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=443, Invalid=2863, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 17:18:36,740 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 14575 mSDsluCounter, 31537 mSDsCounter, 0 mSdLazyCounter, 333 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14575 SdHoareTripleChecker+Valid, 33058 SdHoareTripleChecker+Invalid, 598 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 245 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:36,741 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14575 Valid, 33058 Invalid, 598 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 333 Invalid, 0 Unknown, 245 Unchecked, 0.6s Time] [2021-11-23 17:18:36,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1990 states. [2021-11-23 17:18:36,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1990 to 1855. [2021-11-23 17:18:36,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1855 states, 1853 states have (on average 1.6832164058283865) internal successors, (3119), 1854 states have internal predecessors, (3119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:36,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1855 states to 1855 states and 3119 transitions. [2021-11-23 17:18:36,794 INFO L78 Accepts]: Start accepts. Automaton has 1855 states and 3119 transitions. Word has length 67 [2021-11-23 17:18:36,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:36,795 INFO L470 AbstractCegarLoop]: Abstraction has 1855 states and 3119 transitions. [2021-11-23 17:18:36,795 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 17:18:36,795 INFO L276 IsEmpty]: Start isEmpty. Operand 1855 states and 3119 transitions. [2021-11-23 17:18:36,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:18:36,796 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:36,796 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:36,810 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (35)] Ended with exit code 0 [2021-11-23 17:18:37,022 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2021-11-23 17:18:37,208 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Ended with exit code 0 [2021-11-23 17:18:37,398 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:37,399 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:37,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:37,399 INFO L85 PathProgramCache]: Analyzing trace with hash -14785480, now seen corresponding path program 1 times [2021-11-23 17:18:37,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:37,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1578198119] [2021-11-23 17:18:37,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:37,399 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:37,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:37,400 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:37,402 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-23 17:18:37,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:37,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:18:37,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:37,800 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 17:18:37,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:38,062 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 17:18:38,062 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:38,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1578198119] [2021-11-23 17:18:38,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1578198119] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:38,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [301252220] [2021-11-23 17:18:38,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:38,063 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:38,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:38,064 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:38,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-23 17:18:38,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:38,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:18:38,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:38,567 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 17:18:38,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:38,771 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 17:18:38,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [301252220] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:38,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [181920979] [2021-11-23 17:18:38,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:38,772 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:38,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:38,783 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:38,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-23 17:18:38,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:38,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:18:38,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:39,225 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 17:18:39,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:39,459 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 17:18:39,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [181920979] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:39,460 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:39,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 6 [2021-11-23 17:18:39,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406821437] [2021-11-23 17:18:39,460 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:39,461 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:18:39,461 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:39,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:18:39,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:18:39,461 INFO L87 Difference]: Start difference. First operand 1855 states and 3119 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 17:18:39,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:39,576 INFO L93 Difference]: Finished difference Result 2611 states and 4105 transitions. [2021-11-23 17:18:39,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:18:39,577 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 17:18:39,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:39,581 INFO L225 Difference]: With dead ends: 2611 [2021-11-23 17:18:39,581 INFO L226 Difference]: Without dead ends: 2329 [2021-11-23 17:18:39,583 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 17:18:39,584 INFO L933 BasicCegarLoop]: 1536 mSDtfsCounter, 4485 mSDsluCounter, 1648 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4485 SdHoareTripleChecker+Valid, 3184 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 8 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:39,584 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4485 Valid, 3184 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 19 Invalid, 0 Unknown, 8 Unchecked, 0.0s Time] [2021-11-23 17:18:39,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2329 states. [2021-11-23 17:18:39,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2329 to 2261. [2021-11-23 17:18:39,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2261 states, 2259 states have (on average 1.6104471004869412) internal successors, (3638), 2260 states have internal predecessors, (3638), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:39,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2261 states to 2261 states and 3638 transitions. [2021-11-23 17:18:39,674 INFO L78 Accepts]: Start accepts. Automaton has 2261 states and 3638 transitions. Word has length 68 [2021-11-23 17:18:39,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:39,675 INFO L470 AbstractCegarLoop]: Abstraction has 2261 states and 3638 transitions. [2021-11-23 17:18:39,675 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 17:18:39,675 INFO L276 IsEmpty]: Start isEmpty. Operand 2261 states and 3638 transitions. [2021-11-23 17:18:39,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:18:39,676 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:39,677 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 17:18:39,695 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:39,917 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2021-11-23 17:18:40,093 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Ended with exit code 0 [2021-11-23 17:18:40,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:40,292 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:40,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:40,292 INFO L85 PathProgramCache]: Analyzing trace with hash -1574375839, now seen corresponding path program 1 times [2021-11-23 17:18:40,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:40,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [261841105] [2021-11-23 17:18:40,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:40,293 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:40,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:40,294 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:40,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-23 17:18:40,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:40,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:18:40,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:44,977 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:44,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:48,149 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:48,149 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:48,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [261841105] [2021-11-23 17:18:48,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [261841105] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:48,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [729483689] [2021-11-23 17:18:48,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:48,149 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:48,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:48,150 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:48,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-23 17:18:48,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:48,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:18:48,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:51,502 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:51,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:52,518 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:52,518 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [729483689] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:52,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1583598593] [2021-11-23 17:18:52,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:52,519 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:52,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:52,520 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:52,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-23 17:18:52,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:52,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:18:52,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:58,364 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:58,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:00,135 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 17:19:00,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1583598593] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:00,136 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:19:00,136 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18, 11, 9, 23, 20] total 68 [2021-11-23 17:19:00,136 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361346097] [2021-11-23 17:19:00,136 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:19:00,137 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-23 17:19:00,137 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:00,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-23 17:19:00,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=555, Invalid=4001, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 17:19:00,140 INFO L87 Difference]: Start difference. First operand 2261 states and 3638 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 17:19:00,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:00,956 INFO L93 Difference]: Finished difference Result 2516 states and 3967 transitions. [2021-11-23 17:19:00,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:19:00,957 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 17:19:00,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:00,961 INFO L225 Difference]: With dead ends: 2516 [2021-11-23 17:19:00,961 INFO L226 Difference]: Without dead ends: 2288 [2021-11-23 17:19:00,964 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 337 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2137 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=612, Invalid=4218, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 17:19:00,964 INFO L933 BasicCegarLoop]: 1494 mSDtfsCounter, 11658 mSDsluCounter, 25540 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11658 SdHoareTripleChecker+Valid, 27034 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 187 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:00,965 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11658 Valid, 27034 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 115 Invalid, 0 Unknown, 187 Unchecked, 0.2s Time] [2021-11-23 17:19:00,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2288 states. [2021-11-23 17:19:01,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2288 to 2267. [2021-11-23 17:19:01,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2267 states, 2265 states have (on average 1.609271523178808) internal successors, (3645), 2266 states have internal predecessors, (3645), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:01,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2267 states to 2267 states and 3645 transitions. [2021-11-23 17:19:01,039 INFO L78 Accepts]: Start accepts. Automaton has 2267 states and 3645 transitions. Word has length 68 [2021-11-23 17:19:01,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:01,039 INFO L470 AbstractCegarLoop]: Abstraction has 2267 states and 3645 transitions. [2021-11-23 17:19:01,039 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 17:19:01,040 INFO L276 IsEmpty]: Start isEmpty. Operand 2267 states and 3645 transitions. [2021-11-23 17:19:01,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:19:01,041 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:01,041 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 17:19:01,044 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (41)] Ended with exit code 0 [2021-11-23 17:19:01,267 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2021-11-23 17:19:01,453 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Ended with exit code 0 [2021-11-23 17:19:01,643 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:19:01,643 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:01,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:01,644 INFO L85 PathProgramCache]: Analyzing trace with hash 1310661252, now seen corresponding path program 1 times [2021-11-23 17:19:01,644 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:01,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [839199907] [2021-11-23 17:19:01,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:01,645 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:01,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:01,645 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:01,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-23 17:19:01,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:01,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:19:01,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:05,239 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 17:19:05,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:07,927 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 17:19:07,927 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:07,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [839199907] [2021-11-23 17:19:07,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [839199907] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:07,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1553688439] [2021-11-23 17:19:07,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:07,928 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:07,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:07,929 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:07,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-23 17:19:08,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:08,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:19:08,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:10,758 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 17:19:10,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:12,927 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 17:19:12,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1553688439] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:12,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161874272] [2021-11-23 17:19:12,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:12,928 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:12,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:19:12,929 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:19:12,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-23 17:19:12,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:12,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:19:12,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:16,591 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 17:19:16,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:17,956 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 17:19:17,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1161874272] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:17,956 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:19:17,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 22, 20, 16, 15] total 72 [2021-11-23 17:19:17,956 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [530747827] [2021-11-23 17:19:17,956 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:19:17,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-23 17:19:17,957 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:17,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-23 17:19:17,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=696, Invalid=4416, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 17:19:17,961 INFO L87 Difference]: Start difference. First operand 2267 states and 3645 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 17:19:19,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:19,232 INFO L93 Difference]: Finished difference Result 2823 states and 4338 transitions. [2021-11-23 17:19:19,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:19:19,232 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 17:19:19,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:19,235 INFO L225 Difference]: With dead ends: 2823 [2021-11-23 17:19:19,236 INFO L226 Difference]: Without dead ends: 2375 [2021-11-23 17:19:19,238 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 334 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2577 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=805, Invalid=4745, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 17:19:19,238 INFO L933 BasicCegarLoop]: 1526 mSDtfsCounter, 4496 mSDsluCounter, 37879 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4496 SdHoareTripleChecker+Valid, 39405 SdHoareTripleChecker+Invalid, 721 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 205 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:19,239 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4496 Valid, 39405 Invalid, 721 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 501 Invalid, 0 Unknown, 205 Unchecked, 0.8s Time] [2021-11-23 17:19:19,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2375 states. [2021-11-23 17:19:19,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2375 to 2132. [2021-11-23 17:19:19,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2132 states, 2130 states have (on average 1.627699530516432) internal successors, (3467), 2131 states have internal predecessors, (3467), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:19,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2132 states to 2132 states and 3467 transitions. [2021-11-23 17:19:19,313 INFO L78 Accepts]: Start accepts. Automaton has 2132 states and 3467 transitions. Word has length 68 [2021-11-23 17:19:19,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:19,313 INFO L470 AbstractCegarLoop]: Abstraction has 2132 states and 3467 transitions. [2021-11-23 17:19:19,313 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 17:19:19,314 INFO L276 IsEmpty]: Start isEmpty. Operand 2132 states and 3467 transitions. [2021-11-23 17:19:19,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 17:19:19,315 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:19,315 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 17:19:19,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:19,540 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Ended with exit code 0 [2021-11-23 17:19:19,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (44)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:19,931 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:19,931 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:19,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:19,931 INFO L85 PathProgramCache]: Analyzing trace with hash 1846619806, now seen corresponding path program 1 times [2021-11-23 17:19:19,931 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:19,931 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1021612755] [2021-11-23 17:19:19,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:19,932 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:19,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:19,932 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:19,935 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-23 17:19:19,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:19,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:19:19,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:20,286 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 17:19:20,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:20,517 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 17:19:20,518 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:20,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1021612755] [2021-11-23 17:19:20,518 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1021612755] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:20,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1555792519] [2021-11-23 17:19:20,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:20,518 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:20,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:20,519 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:20,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (47)] Waiting until timeout for monitored process [2021-11-23 17:19:20,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:20,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:19:20,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:20,700 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 17:19:20,700 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:19:20,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1555792519] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:19:20,700 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:19:20,700 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 17:19:20,701 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154999283] [2021-11-23 17:19:20,701 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:19:20,701 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:19:20,701 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:20,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:19:20,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:19:20,701 INFO L87 Difference]: Start difference. First operand 2132 states and 3467 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 17:19:20,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:20,772 INFO L93 Difference]: Finished difference Result 2655 states and 4141 transitions. [2021-11-23 17:19:20,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:19:20,773 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 17:19:20,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:20,775 INFO L225 Difference]: With dead ends: 2655 [2021-11-23 17:19:20,775 INFO L226 Difference]: Without dead ends: 2153 [2021-11-23 17:19:20,775 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 17:19:20,776 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 17:19:20,777 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 17:19:20,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2153 states. [2021-11-23 17:19:20,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2153 to 2102. [2021-11-23 17:19:20,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2102 states, 2100 states have (on average 1.631904761904762) internal successors, (3427), 2101 states have internal predecessors, (3427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:20,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2102 states to 2102 states and 3427 transitions. [2021-11-23 17:19:20,828 INFO L78 Accepts]: Start accepts. Automaton has 2102 states and 3427 transitions. Word has length 69 [2021-11-23 17:19:20,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:20,829 INFO L470 AbstractCegarLoop]: Abstraction has 2102 states and 3427 transitions. [2021-11-23 17:19:20,829 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 17:19:20,829 INFO L276 IsEmpty]: Start isEmpty. Operand 2102 states and 3427 transitions. [2021-11-23 17:19:20,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 17:19:20,830 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:20,830 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 17:19:20,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:21,046 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (47)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:21,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:21,244 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:21,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:21,244 INFO L85 PathProgramCache]: Analyzing trace with hash 1362739138, now seen corresponding path program 1 times [2021-11-23 17:19:21,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:21,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [99954175] [2021-11-23 17:19:21,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:21,245 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:21,245 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:21,246 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:21,250 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 17:19:21,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:21,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:19:21,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:23,049 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 17:19:23,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:23,544 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 17:19:23,544 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:23,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [99954175] [2021-11-23 17:19:23,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [99954175] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:23,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1782329011] [2021-11-23 17:19:23,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:23,544 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:23,545 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:23,545 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:23,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2021-11-23 17:19:23,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:23,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:19:23,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:25,194 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 17:19:25,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:25,466 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 17:19:25,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1782329011] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:25,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1454220153] [2021-11-23 17:19:25,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:25,466 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:25,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:19:25,467 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:19:25,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-23 17:19:25,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:25,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:19:25,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:27,014 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 17:19:27,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:27,277 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 17:19:27,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1454220153] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:27,278 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:19:27,278 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 10, 9] total 18 [2021-11-23 17:19:27,278 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [46477968] [2021-11-23 17:19:27,279 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:19:27,279 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:19:27,279 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:27,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:19:27,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:19:27,281 INFO L87 Difference]: Start difference. First operand 2102 states and 3427 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 17:19:27,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:27,491 INFO L93 Difference]: Finished difference Result 2273 states and 3651 transitions. [2021-11-23 17:19:27,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:19:27,491 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 17:19:27,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:27,494 INFO L225 Difference]: With dead ends: 2273 [2021-11-23 17:19:27,494 INFO L226 Difference]: Without dead ends: 2050 [2021-11-23 17:19:27,495 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 17:19:27,496 INFO L933 BasicCegarLoop]: 1507 mSDtfsCounter, 5821 mSDsluCounter, 10644 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5821 SdHoareTripleChecker+Valid, 12151 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 52 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:27,496 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5821 Valid, 12151 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 61 Invalid, 0 Unknown, 52 Unchecked, 0.1s Time] [2021-11-23 17:19:27,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2050 states. [2021-11-23 17:19:27,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2050 to 2038. [2021-11-23 17:19:27,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2038 states, 2036 states have (on average 1.6419449901768173) internal successors, (3343), 2037 states have internal predecessors, (3343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:27,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2038 states to 2038 states and 3343 transitions. [2021-11-23 17:19:27,577 INFO L78 Accepts]: Start accepts. Automaton has 2038 states and 3343 transitions. Word has length 69 [2021-11-23 17:19:27,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:27,578 INFO L470 AbstractCegarLoop]: Abstraction has 2038 states and 3343 transitions. [2021-11-23 17:19:27,578 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 17:19:27,578 INFO L276 IsEmpty]: Start isEmpty. Operand 2038 states and 3343 transitions. [2021-11-23 17:19:27,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:19:27,580 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:27,582 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 17:19:27,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:27,794 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Ended with exit code 0 [2021-11-23 17:19:28,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:28,185 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:28,185 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:28,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:28,186 INFO L85 PathProgramCache]: Analyzing trace with hash 1940957519, now seen corresponding path program 1 times [2021-11-23 17:19:28,186 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:28,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1799208241] [2021-11-23 17:19:28,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:28,186 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:28,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:28,187 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:28,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-23 17:19:28,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:28,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:19:28,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:30,951 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 17:19:30,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:31,832 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 17:19:31,833 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:31,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1799208241] [2021-11-23 17:19:31,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1799208241] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:31,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1454160392] [2021-11-23 17:19:31,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:31,834 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:31,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:31,835 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:31,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2021-11-23 17:19:31,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:31,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:19:31,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:34,190 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 17:19:34,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:34,772 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 17:19:34,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1454160392] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:34,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [243576344] [2021-11-23 17:19:34,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:34,773 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:34,773 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:19:34,774 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:19:34,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-23 17:19:34,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:34,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:19:34,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:36,761 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 17:19:36,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:37,744 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 17:19:37,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [243576344] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:37,745 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:19:37,745 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:19:37,745 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [664136321] [2021-11-23 17:19:37,745 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:19:37,746 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:19:37,746 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:37,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:19:37,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:19:37,747 INFO L87 Difference]: Start difference. First operand 2038 states and 3343 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 17:19:38,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:38,618 INFO L93 Difference]: Finished difference Result 2487 states and 3918 transitions. [2021-11-23 17:19:38,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:19:38,619 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 17:19:38,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:38,621 INFO L225 Difference]: With dead ends: 2487 [2021-11-23 17:19:38,621 INFO L226 Difference]: Without dead ends: 2072 [2021-11-23 17:19:38,623 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 674 GetRequests, 632 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=258, Invalid=1634, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:19:38,624 INFO L933 BasicCegarLoop]: 1514 mSDtfsCounter, 11667 mSDsluCounter, 21279 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11667 SdHoareTripleChecker+Valid, 22793 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 99 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:38,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11667 Valid, 22793 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 49 Invalid, 0 Unknown, 99 Unchecked, 0.1s Time] [2021-11-23 17:19:38,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2072 states. [2021-11-23 17:19:38,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2072 to 2072. [2021-11-23 17:19:38,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2072 states, 2070 states have (on average 1.6328502415458936) internal successors, (3380), 2071 states have internal predecessors, (3380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:38,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2072 states to 2072 states and 3380 transitions. [2021-11-23 17:19:38,679 INFO L78 Accepts]: Start accepts. Automaton has 2072 states and 3380 transitions. Word has length 111 [2021-11-23 17:19:38,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:38,679 INFO L470 AbstractCegarLoop]: Abstraction has 2072 states and 3380 transitions. [2021-11-23 17:19:38,679 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 17:19:38,679 INFO L276 IsEmpty]: Start isEmpty. Operand 2072 states and 3380 transitions. [2021-11-23 17:19:38,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:19:38,681 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:38,681 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 17:19:38,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:38,922 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2021-11-23 17:19:39,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:39,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:39,297 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:39,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:39,298 INFO L85 PathProgramCache]: Analyzing trace with hash -721276639, now seen corresponding path program 1 times [2021-11-23 17:19:39,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:39,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1853344705] [2021-11-23 17:19:39,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:39,299 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:39,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:39,300 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:39,302 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-23 17:19:39,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:39,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:19:39,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:42,096 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 17:19:42,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:43,069 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 17:19:43,070 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:43,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1853344705] [2021-11-23 17:19:43,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1853344705] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:43,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [386022084] [2021-11-23 17:19:43,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:43,070 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:43,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:43,071 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:43,072 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-11-23 17:19:43,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:43,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:19:43,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:45,387 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 17:19:45,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:46,080 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 17:19:46,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [386022084] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:46,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1943951249] [2021-11-23 17:19:46,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:46,081 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:46,081 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:19:46,082 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:19:46,083 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-23 17:19:46,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:46,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:19:46,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:48,582 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 17:19:48,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:49,422 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 17:19:49,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1943951249] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:49,422 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:19:49,422 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:19:49,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813627227] [2021-11-23 17:19:49,423 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:19:49,424 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:19:49,424 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:49,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:19:49,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:19:49,425 INFO L87 Difference]: Start difference. First operand 2072 states and 3380 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 17:19:50,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:50,302 INFO L93 Difference]: Finished difference Result 2571 states and 4011 transitions. [2021-11-23 17:19:50,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:19:50,302 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 17:19:50,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:50,305 INFO L225 Difference]: With dead ends: 2571 [2021-11-23 17:19:50,305 INFO L226 Difference]: Without dead ends: 2162 [2021-11-23 17:19:50,307 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 674 GetRequests, 632 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=246, Invalid=1646, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:19:50,308 INFO L933 BasicCegarLoop]: 1518 mSDtfsCounter, 5957 mSDsluCounter, 24158 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5957 SdHoareTripleChecker+Valid, 25676 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 108 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:50,308 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5957 Valid, 25676 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 50 Invalid, 0 Unknown, 108 Unchecked, 0.1s Time] [2021-11-23 17:19:50,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2162 states. [2021-11-23 17:19:50,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2162 to 2162. [2021-11-23 17:19:50,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2162 states, 2160 states have (on average 1.611574074074074) internal successors, (3481), 2161 states have internal predecessors, (3481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:50,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2162 states to 2162 states and 3481 transitions. [2021-11-23 17:19:50,366 INFO L78 Accepts]: Start accepts. Automaton has 2162 states and 3481 transitions. Word has length 111 [2021-11-23 17:19:50,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:50,367 INFO L470 AbstractCegarLoop]: Abstraction has 2162 states and 3481 transitions. [2021-11-23 17:19:50,367 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 17:19:50,367 INFO L276 IsEmpty]: Start isEmpty. Operand 2162 states and 3481 transitions. [2021-11-23 17:19:50,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:19:50,369 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:50,369 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 17:19:50,401 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:50,584 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:50,793 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Ended with exit code 0 [2021-11-23 17:19:50,983 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:19:50,983 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:50,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:50,983 INFO L85 PathProgramCache]: Analyzing trace with hash 1804907841, now seen corresponding path program 1 times [2021-11-23 17:19:50,984 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:50,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [320500867] [2021-11-23 17:19:50,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:50,984 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:50,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:50,985 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:50,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 17:19:51,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:51,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:19:51,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:54,079 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 17:19:54,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:54,922 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 17:19:54,922 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:54,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [320500867] [2021-11-23 17:19:54,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [320500867] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:54,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1407279695] [2021-11-23 17:19:54,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:54,923 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:54,923 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:54,924 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:54,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2021-11-23 17:19:55,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:55,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:19:55,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:57,766 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 17:19:57,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:58,250 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 17:19:58,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1407279695] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:58,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1920506684] [2021-11-23 17:19:58,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:58,251 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:19:58,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:19:58,260 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:19:58,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-23 17:19:58,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:58,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:19:58,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:00,641 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 17:20:00,641 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:01,491 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 17:20:01,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1920506684] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:01,491 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:20:01,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:20:01,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629762722] [2021-11-23 17:20:01,492 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:20:01,492 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:20:01,492 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:01,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:20:01,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:20:01,494 INFO L87 Difference]: Start difference. First operand 2162 states and 3481 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 17:20:02,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:02,399 INFO L93 Difference]: Finished difference Result 2747 states and 4209 transitions. [2021-11-23 17:20:02,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:20:02,400 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 17:20:02,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:02,403 INFO L225 Difference]: With dead ends: 2747 [2021-11-23 17:20:02,403 INFO L226 Difference]: Without dead ends: 2350 [2021-11-23 17:20:02,404 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 674 GetRequests, 632 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=252, Invalid=1640, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:20:02,405 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 10254 mSDsluCounter, 27211 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10254 SdHoareTripleChecker+Valid, 28732 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 142 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:02,406 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10254 Valid, 28732 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 39 Invalid, 0 Unknown, 142 Unchecked, 0.1s Time] [2021-11-23 17:20:02,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2350 states. [2021-11-23 17:20:02,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2350 to 2350. [2021-11-23 17:20:02,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2350 states, 2348 states have (on average 1.573679727427598) internal successors, (3695), 2349 states have internal predecessors, (3695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:02,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2350 states to 2350 states and 3695 transitions. [2021-11-23 17:20:02,501 INFO L78 Accepts]: Start accepts. Automaton has 2350 states and 3695 transitions. Word has length 111 [2021-11-23 17:20:02,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:02,501 INFO L470 AbstractCegarLoop]: Abstraction has 2350 states and 3695 transitions. [2021-11-23 17:20:02,502 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 17:20:02,502 INFO L276 IsEmpty]: Start isEmpty. Operand 2350 states and 3695 transitions. [2021-11-23 17:20:02,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:20:02,503 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:02,504 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 17:20:02,514 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:02,730 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2021-11-23 17:20:02,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:03,107 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:03,107 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:03,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:03,107 INFO L85 PathProgramCache]: Analyzing trace with hash 1868570961, now seen corresponding path program 1 times [2021-11-23 17:20:03,108 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:03,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1329286479] [2021-11-23 17:20:03,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:03,108 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:03,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:03,109 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:03,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-23 17:20:03,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:03,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:20:03,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:05,286 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 17:20:05,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:06,128 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 17:20:06,128 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:06,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1329286479] [2021-11-23 17:20:06,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1329286479] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:06,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [970356708] [2021-11-23 17:20:06,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:06,129 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:06,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:20:06,130 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:20:06,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2021-11-23 17:20:06,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:06,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:20:06,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:09,861 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 17:20:09,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:11,127 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 17:20:11,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [970356708] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:11,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1635158133] [2021-11-23 17:20:11,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:11,128 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:20:11,128 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:20:11,133 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:20:11,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-23 17:20:11,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:11,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:20:11,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:13,697 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 17:20:13,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:14,527 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 17:20:14,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1635158133] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:14,528 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:20:14,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:20:14,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397081699] [2021-11-23 17:20:14,528 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:20:14,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:20:14,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:14,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:20:14,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:20:14,532 INFO L87 Difference]: Start difference. First operand 2350 states and 3695 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 17:20:17,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:17,131 INFO L93 Difference]: Finished difference Result 2912 states and 4411 transitions. [2021-11-23 17:20:17,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 17:20:17,131 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 17:20:17,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:17,134 INFO L225 Difference]: With dead ends: 2912 [2021-11-23 17:20:17,134 INFO L226 Difference]: Without dead ends: 2460 [2021-11-23 17:20:17,137 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 689 GetRequests, 620 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1121 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=468, Invalid=4088, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 17:20:17,137 INFO L933 BasicCegarLoop]: 1518 mSDtfsCounter, 16103 mSDsluCounter, 34842 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16103 SdHoareTripleChecker+Valid, 36360 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 166 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:17,138 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16103 Valid, 36360 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 83 Invalid, 0 Unknown, 166 Unchecked, 0.1s Time] [2021-11-23 17:20:17,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2460 states. [2021-11-23 17:20:17,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2460 to 2456. [2021-11-23 17:20:17,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2456 states, 2454 states have (on average 1.5562347188264058) internal successors, (3819), 2455 states have internal predecessors, (3819), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:17,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2456 states to 2456 states and 3819 transitions. [2021-11-23 17:20:17,241 INFO L78 Accepts]: Start accepts. Automaton has 2456 states and 3819 transitions. Word has length 111 [2021-11-23 17:20:17,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:17,242 INFO L470 AbstractCegarLoop]: Abstraction has 2456 states and 3819 transitions. [2021-11-23 17:20:17,242 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 17:20:17,242 INFO L276 IsEmpty]: Start isEmpty. Operand 2456 states and 3819 transitions. [2021-11-23 17:20:17,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:20:17,244 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:17,244 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 17:20:17,267 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2021-11-23 17:20:17,446 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Ended with exit code 0 [2021-11-23 17:20:17,654 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Ended with exit code 0 [2021-11-23 17:20:17,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:20:17,845 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:17,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:17,845 INFO L85 PathProgramCache]: Analyzing trace with hash -1694478255, now seen corresponding path program 1 times [2021-11-23 17:20:17,846 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:17,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [335073207] [2021-11-23 17:20:17,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:17,846 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:17,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:17,847 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:17,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2021-11-23 17:20:17,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:17,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:20:17,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:19,997 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 17:20:19,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:20,788 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 17:20:20,788 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:20,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [335073207] [2021-11-23 17:20:20,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [335073207] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:20,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1646369513] [2021-11-23 17:20:20,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:20,788 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:20,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:20:20,791 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:20:20,792 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Waiting until timeout for monitored process [2021-11-23 17:20:20,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:20,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:20:20,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:24,580 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 17:20:24,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:25,744 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 17:20:25,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1646369513] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:25,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [847163892] [2021-11-23 17:20:25,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:25,745 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:20:25,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:20:25,750 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:20:25,779 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-23 17:20:25,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:25,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:20:25,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:28,081 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 17:20:28,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:29,210 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 17:20:29,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [847163892] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:29,211 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:20:29,211 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:20:29,211 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739322007] [2021-11-23 17:20:29,211 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:20:29,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:20:29,212 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:29,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:20:29,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:20:29,214 INFO L87 Difference]: Start difference. First operand 2456 states and 3819 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 17:20:31,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:31,358 INFO L93 Difference]: Finished difference Result 3035 states and 4556 transitions. [2021-11-23 17:20:31,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:20:31,359 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 17:20:31,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:31,361 INFO L225 Difference]: With dead ends: 3035 [2021-11-23 17:20:31,362 INFO L226 Difference]: Without dead ends: 2579 [2021-11-23 17:20:31,364 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 686 GetRequests, 620 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=413, Invalid=3747, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 17:20:31,364 INFO L933 BasicCegarLoop]: 1517 mSDtfsCounter, 14630 mSDsluCounter, 35003 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14630 SdHoareTripleChecker+Valid, 36520 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 152 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:31,365 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14630 Valid, 36520 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 71 Invalid, 0 Unknown, 152 Unchecked, 0.1s Time] [2021-11-23 17:20:31,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2579 states. [2021-11-23 17:20:31,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2579 to 2575. [2021-11-23 17:20:31,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2575 states, 2573 states have (on average 1.5386708122813837) internal successors, (3959), 2574 states have internal predecessors, (3959), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:31,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2575 states to 2575 states and 3959 transitions. [2021-11-23 17:20:31,448 INFO L78 Accepts]: Start accepts. Automaton has 2575 states and 3959 transitions. Word has length 111 [2021-11-23 17:20:31,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:31,448 INFO L470 AbstractCegarLoop]: Abstraction has 2575 states and 3959 transitions. [2021-11-23 17:20:31,448 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 17:20:31,448 INFO L276 IsEmpty]: Start isEmpty. Operand 2575 states and 3959 transitions. [2021-11-23 17:20:31,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:20:31,450 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:31,450 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 17:20:31,461 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:31,656 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:31,878 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Ended with exit code 0 [2021-11-23 17:20:32,056 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:20:32,056 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:32,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:32,057 INFO L85 PathProgramCache]: Analyzing trace with hash -1930363055, now seen corresponding path program 1 times [2021-11-23 17:20:32,057 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:32,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [902544672] [2021-11-23 17:20:32,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:32,057 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:32,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:32,058 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:32,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Waiting until timeout for monitored process [2021-11-23 17:20:32,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:32,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:20:32,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:33,792 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 17:20:33,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:34,725 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 17:20:34,725 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:34,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [902544672] [2021-11-23 17:20:34,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [902544672] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:34,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1479639426] [2021-11-23 17:20:34,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:34,726 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:34,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:20:34,727 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:20:34,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Waiting until timeout for monitored process [2021-11-23 17:20:34,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:34,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:20:34,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:37,126 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 17:20:37,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:38,037 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 17:20:38,037 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1479639426] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:38,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1668727287] [2021-11-23 17:20:38,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:38,037 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:20:38,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:20:38,038 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:20:38,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-23 17:20:38,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:38,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:20:38,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:39,882 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 17:20:39,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:40,973 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 17:20:40,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1668727287] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:40,973 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:20:40,973 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 17:20:40,973 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56731155] [2021-11-23 17:20:40,974 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:20:40,974 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 17:20:40,974 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:40,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 17:20:40,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 17:20:40,976 INFO L87 Difference]: Start difference. First operand 2575 states and 3959 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 17:20:42,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:42,474 INFO L93 Difference]: Finished difference Result 3063 states and 4585 transitions. [2021-11-23 17:20:42,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:20:42,475 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 17:20:42,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:42,477 INFO L225 Difference]: With dead ends: 3063 [2021-11-23 17:20:42,477 INFO L226 Difference]: Without dead ends: 2603 [2021-11-23 17:20:42,479 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 627 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=361, Invalid=2609, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:20:42,480 INFO L933 BasicCegarLoop]: 1505 mSDtfsCounter, 8834 mSDsluCounter, 27080 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8834 SdHoareTripleChecker+Valid, 28585 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 140 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:42,480 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8834 Valid, 28585 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 67 Invalid, 0 Unknown, 140 Unchecked, 0.1s Time] [2021-11-23 17:20:42,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2603 states. [2021-11-23 17:20:42,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2603 to 2600. [2021-11-23 17:20:42,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2600 states, 2598 states have (on average 1.5319476520400308) internal successors, (3980), 2599 states have internal predecessors, (3980), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:42,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2600 states to 2600 states and 3980 transitions. [2021-11-23 17:20:42,554 INFO L78 Accepts]: Start accepts. Automaton has 2600 states and 3980 transitions. Word has length 111 [2021-11-23 17:20:42,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:42,555 INFO L470 AbstractCegarLoop]: Abstraction has 2600 states and 3980 transitions. [2021-11-23 17:20:42,555 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 17:20:42,555 INFO L276 IsEmpty]: Start isEmpty. Operand 2600 states and 3980 transitions. [2021-11-23 17:20:42,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:20:42,557 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:42,557 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 17:20:42,566 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:42,783 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Ended with exit code 0 [2021-11-23 17:20:42,959 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:43,158 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:43,158 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:43,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:43,158 INFO L85 PathProgramCache]: Analyzing trace with hash 1699429479, now seen corresponding path program 1 times [2021-11-23 17:20:43,159 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:43,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1652780650] [2021-11-23 17:20:43,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:43,159 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:43,159 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:43,160 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:43,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2021-11-23 17:20:43,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:43,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:20:43,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:50,024 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 17:20:50,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:52,927 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 17:20:52,927 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:52,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1652780650] [2021-11-23 17:20:52,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1652780650] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:52,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [564080497] [2021-11-23 17:20:52,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:52,927 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:52,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:20:52,928 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:20:52,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Waiting until timeout for monitored process [2021-11-23 17:20:53,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:53,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-23 17:20:53,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:58,805 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 17:20:58,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:02,751 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 17:21:02,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [564080497] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:02,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1431679482] [2021-11-23 17:21:02,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:02,751 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:02,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:21:02,752 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:21:02,753 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-23 17:21:02,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:02,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:21:02,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:10,672 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 17:21:10,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:13,662 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 17:21:13,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1431679482] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:13,662 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:21:13,663 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20, 22, 24, 18, 17] total 100 [2021-11-23 17:21:13,663 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788381049] [2021-11-23 17:21:13,663 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:21:13,663 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2021-11-23 17:21:13,663 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:13,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-11-23 17:21:13,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=930, Invalid=8970, Unknown=0, NotChecked=0, Total=9900 [2021-11-23 17:21:13,666 INFO L87 Difference]: Start difference. First operand 2600 states and 3980 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 17:21:18,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:18,562 INFO L93 Difference]: Finished difference Result 3260 states and 4787 transitions. [2021-11-23 17:21:18,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 17:21:18,563 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 17:21:18,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:18,566 INFO L225 Difference]: With dead ends: 3260 [2021-11-23 17:21:18,566 INFO L226 Difference]: Without dead ends: 2586 [2021-11-23 17:21:18,568 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 694 GetRequests, 576 SyntacticMatches, 3 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4993 ImplicationChecksByTransitivity, 19.4s TimeCoverageRelationStatistics Valid=1362, Invalid=12210, Unknown=0, NotChecked=0, Total=13572 [2021-11-23 17:21:18,569 INFO L933 BasicCegarLoop]: 1497 mSDtfsCounter, 14661 mSDsluCounter, 43270 mSDsCounter, 0 mSdLazyCounter, 378 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14661 SdHoareTripleChecker+Valid, 44767 SdHoareTripleChecker+Invalid, 530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 378 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 125 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:18,569 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14661 Valid, 44767 Invalid, 530 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [27 Valid, 378 Invalid, 0 Unknown, 125 Unchecked, 0.8s Time] [2021-11-23 17:21:18,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2586 states. [2021-11-23 17:21:18,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2586 to 2520. [2021-11-23 17:21:18,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2520 states, 2518 states have (on average 1.5456711675933281) internal successors, (3892), 2519 states have internal predecessors, (3892), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:18,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2520 states to 2520 states and 3892 transitions. [2021-11-23 17:21:18,659 INFO L78 Accepts]: Start accepts. Automaton has 2520 states and 3892 transitions. Word has length 112 [2021-11-23 17:21:18,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:18,660 INFO L470 AbstractCegarLoop]: Abstraction has 2520 states and 3892 transitions. [2021-11-23 17:21:18,660 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 17:21:18,660 INFO L276 IsEmpty]: Start isEmpty. Operand 2520 states and 3892 transitions. [2021-11-23 17:21:18,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:21:18,662 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:18,662 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 17:21:18,672 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Ended with exit code 0 [2021-11-23 17:21:18,882 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Ended with exit code 0 [2021-11-23 17:21:19,064 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:19,263 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:19,263 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:19,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:19,263 INFO L85 PathProgramCache]: Analyzing trace with hash -510823495, now seen corresponding path program 1 times [2021-11-23 17:21:19,264 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:19,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [409126699] [2021-11-23 17:21:19,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:19,264 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:19,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:19,265 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:19,266 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Waiting until timeout for monitored process [2021-11-23 17:21:19,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:19,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:19,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:20,843 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 17:21:20,843 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:21,660 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 17:21:21,660 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:21,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [409126699] [2021-11-23 17:21:21,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [409126699] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:21,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1494241966] [2021-11-23 17:21:21,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:21,660 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:21,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:21:21,661 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:21:21,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Waiting until timeout for monitored process [2021-11-23 17:21:21,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:21,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:21,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:23,201 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 17:21:23,202 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:23,794 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 17:21:23,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1494241966] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:23,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [563216706] [2021-11-23 17:21:23,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:23,794 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:23,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:21:23,795 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:21:23,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2021-11-23 17:21:23,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:23,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:23,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:25,159 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 17:21:25,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:25,690 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 17:21:25,690 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [563216706] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:25,690 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:21:25,691 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:21:25,691 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139221911] [2021-11-23 17:21:25,691 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:21:25,692 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:21:25,692 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:25,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:21:25,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:21:25,693 INFO L87 Difference]: Start difference. First operand 2520 states and 3892 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 17:21:26,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:26,012 INFO L93 Difference]: Finished difference Result 3464 states and 5099 transitions. [2021-11-23 17:21:26,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 17:21:26,013 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 17:21:26,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:26,015 INFO L225 Difference]: With dead ends: 3464 [2021-11-23 17:21:26,015 INFO L226 Difference]: Without dead ends: 3027 [2021-11-23 17:21:26,016 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 672 GetRequests, 653 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=88, Invalid=332, Unknown=0, NotChecked=0, Total=420 [2021-11-23 17:21:26,016 INFO L933 BasicCegarLoop]: 1515 mSDtfsCounter, 2961 mSDsluCounter, 12147 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2961 SdHoareTripleChecker+Valid, 13662 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 62 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:26,017 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2961 Valid, 13662 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 62 Unchecked, 0.0s Time] [2021-11-23 17:21:26,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3027 states. [2021-11-23 17:21:26,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3027 to 3005. [2021-11-23 17:21:26,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3005 states, 3003 states have (on average 1.5011655011655012) internal successors, (4508), 3004 states have internal predecessors, (4508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:26,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3005 states to 3005 states and 4508 transitions. [2021-11-23 17:21:26,119 INFO L78 Accepts]: Start accepts. Automaton has 3005 states and 4508 transitions. Word has length 112 [2021-11-23 17:21:26,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:26,120 INFO L470 AbstractCegarLoop]: Abstraction has 3005 states and 4508 transitions. [2021-11-23 17:21:26,120 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 17:21:26,120 INFO L276 IsEmpty]: Start isEmpty. Operand 3005 states and 4508 transitions. [2021-11-23 17:21:26,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:21:26,121 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:26,121 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 17:21:26,142 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Ended with exit code 0 [2021-11-23 17:21:26,332 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:26,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:26,722 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:26,722 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:26,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:26,723 INFO L85 PathProgramCache]: Analyzing trace with hash -1336782839, now seen corresponding path program 1 times [2021-11-23 17:21:26,723 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:26,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [821702979] [2021-11-23 17:21:26,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:26,723 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:26,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:26,724 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:26,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Waiting until timeout for monitored process [2021-11-23 17:21:26,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:26,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:21:26,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:27,714 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 17:21:27,714 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:21:27,714 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:27,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [821702979] [2021-11-23 17:21:27,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [821702979] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:21:27,715 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:21:27,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:21:27,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345748225] [2021-11-23 17:21:27,715 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:21:27,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:21:27,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:27,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:21:27,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:21:27,716 INFO L87 Difference]: Start difference. First operand 3005 states and 4508 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 17:21:27,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:27,865 INFO L93 Difference]: Finished difference Result 3896 states and 5647 transitions. [2021-11-23 17:21:27,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:21:27,866 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 17:21:27,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:27,869 INFO L225 Difference]: With dead ends: 3896 [2021-11-23 17:21:27,869 INFO L226 Difference]: Without dead ends: 3444 [2021-11-23 17:21:27,870 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 17:21:27,871 INFO L933 BasicCegarLoop]: 1514 mSDtfsCounter, 2942 mSDsluCounter, 3013 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2942 SdHoareTripleChecker+Valid, 4527 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 32 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:27,871 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2942 Valid, 4527 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 6 Invalid, 0 Unknown, 32 Unchecked, 0.0s Time] [2021-11-23 17:21:27,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3444 states. [2021-11-23 17:21:28,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3444 to 3424. [2021-11-23 17:21:28,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3424 states, 3422 states have (on average 1.4693161893629456) internal successors, (5028), 3423 states have internal predecessors, (5028), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:28,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3424 states to 3424 states and 5028 transitions. [2021-11-23 17:21:28,025 INFO L78 Accepts]: Start accepts. Automaton has 3424 states and 5028 transitions. Word has length 112 [2021-11-23 17:21:28,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:28,025 INFO L470 AbstractCegarLoop]: Abstraction has 3424 states and 5028 transitions. [2021-11-23 17:21:28,025 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 17:21:28,026 INFO L276 IsEmpty]: Start isEmpty. Operand 3424 states and 5028 transitions. [2021-11-23 17:21:28,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:21:28,028 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:28,028 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 17:21:28,041 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Ended with exit code 0 [2021-11-23 17:21:28,238 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:21:28,239 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:28,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:28,239 INFO L85 PathProgramCache]: Analyzing trace with hash -604864759, now seen corresponding path program 1 times [2021-11-23 17:21:28,239 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:28,239 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [14433511] [2021-11-23 17:21:28,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:28,240 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:28,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:28,240 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:28,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (76)] Waiting until timeout for monitored process [2021-11-23 17:21:28,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:28,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:21:28,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:30,509 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 17:21:30,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:31,233 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 17:21:31,233 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:31,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [14433511] [2021-11-23 17:21:31,233 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [14433511] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:31,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [126904006] [2021-11-23 17:21:31,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:31,233 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:31,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:21:31,236 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:21:31,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (77)] Waiting until timeout for monitored process [2021-11-23 17:21:31,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:31,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:31,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:32,984 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 17:21:32,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:33,956 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 17:21:33,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [126904006] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:33,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1446503575] [2021-11-23 17:21:33,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:33,957 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:33,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:21:33,958 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:21:33,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2021-11-23 17:21:34,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:34,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:34,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:35,192 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 17:21:35,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:35,851 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 17:21:35,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1446503575] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:35,851 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:21:35,852 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:21:35,852 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045639865] [2021-11-23 17:21:35,852 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:21:35,853 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:21:35,853 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:35,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:21:35,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:21:35,854 INFO L87 Difference]: Start difference. First operand 3424 states and 5028 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 17:21:37,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:37,755 INFO L93 Difference]: Finished difference Result 4524 states and 6432 transitions. [2021-11-23 17:21:37,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:21:37,756 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 17:21:37,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:37,759 INFO L225 Difference]: With dead ends: 4524 [2021-11-23 17:21:37,759 INFO L226 Difference]: Without dead ends: 4068 [2021-11-23 17:21:37,760 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 693 GetRequests, 641 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=311, Invalid=2341, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 17:21:37,761 INFO L933 BasicCegarLoop]: 1525 mSDtfsCounter, 13171 mSDsluCounter, 21406 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13171 SdHoareTripleChecker+Valid, 22931 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 121 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:37,761 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13171 Valid, 22931 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 86 Invalid, 0 Unknown, 121 Unchecked, 0.1s Time] [2021-11-23 17:21:37,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4068 states. [2021-11-23 17:21:37,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4068 to 4052. [2021-11-23 17:21:37,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4052 states, 4050 states have (on average 1.4372839506172839) internal successors, (5821), 4051 states have internal predecessors, (5821), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:37,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4052 states to 4052 states and 5821 transitions. [2021-11-23 17:21:37,917 INFO L78 Accepts]: Start accepts. Automaton has 4052 states and 5821 transitions. Word has length 112 [2021-11-23 17:21:37,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:37,918 INFO L470 AbstractCegarLoop]: Abstraction has 4052 states and 5821 transitions. [2021-11-23 17:21:37,918 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 17:21:37,918 INFO L276 IsEmpty]: Start isEmpty. Operand 4052 states and 5821 transitions. [2021-11-23 17:21:37,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:21:37,920 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:37,921 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 17:21:37,955 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Ended with exit code 0 [2021-11-23 17:21:38,143 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (76)] Ended with exit code 0 [2021-11-23 17:21:38,336 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (77)] Ended with exit code 0 [2021-11-23 17:21:38,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:38,535 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:38,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:38,535 INFO L85 PathProgramCache]: Analyzing trace with hash -840749559, now seen corresponding path program 1 times [2021-11-23 17:21:38,535 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:38,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1935426539] [2021-11-23 17:21:38,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:38,536 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:38,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:38,539 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:38,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Waiting until timeout for monitored process [2021-11-23 17:21:38,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:38,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:21:38,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:40,263 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 17:21:40,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:41,160 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 17:21:41,161 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:41,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1935426539] [2021-11-23 17:21:41,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1935426539] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:41,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [658598102] [2021-11-23 17:21:41,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:41,161 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:41,161 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:21:41,162 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:21:41,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (80)] Waiting until timeout for monitored process [2021-11-23 17:21:41,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:41,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:41,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:42,577 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 17:21:42,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:43,237 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 17:21:43,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [658598102] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:43,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [597994656] [2021-11-23 17:21:43,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:43,238 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:43,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:21:43,239 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:21:43,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2021-11-23 17:21:43,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:43,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:43,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:44,629 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 17:21:44,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:45,282 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 17:21:45,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [597994656] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:45,282 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:21:45,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 19 [2021-11-23 17:21:45,283 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062056756] [2021-11-23 17:21:45,283 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:21:45,283 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 17:21:45,283 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:45,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 17:21:45,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:21:45,285 INFO L87 Difference]: Start difference. First operand 4052 states and 5821 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 17:21:46,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:46,012 INFO L93 Difference]: Finished difference Result 5131 states and 7179 transitions. [2021-11-23 17:21:46,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 17:21:46,012 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 17:21:46,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:46,017 INFO L225 Difference]: With dead ends: 5131 [2021-11-23 17:21:46,017 INFO L226 Difference]: Without dead ends: 4671 [2021-11-23 17:21:46,019 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 679 GetRequests, 651 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=153, Invalid=717, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:21:46,020 INFO L933 BasicCegarLoop]: 1529 mSDtfsCounter, 4482 mSDsluCounter, 15303 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4482 SdHoareTripleChecker+Valid, 16832 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 75 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:46,020 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4482 Valid, 16832 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 33 Invalid, 0 Unknown, 75 Unchecked, 0.0s Time] [2021-11-23 17:21:46,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4671 states. [2021-11-23 17:21:46,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4671 to 4640. [2021-11-23 17:21:46,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4640 states, 4638 states have (on average 1.4083656748598534) internal successors, (6532), 4639 states have internal predecessors, (6532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:46,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4640 states to 4640 states and 6532 transitions. [2021-11-23 17:21:46,297 INFO L78 Accepts]: Start accepts. Automaton has 4640 states and 6532 transitions. Word has length 112 [2021-11-23 17:21:46,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:46,297 INFO L470 AbstractCegarLoop]: Abstraction has 4640 states and 6532 transitions. [2021-11-23 17:21:46,297 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 17:21:46,298 INFO L276 IsEmpty]: Start isEmpty. Operand 4640 states and 6532 transitions. [2021-11-23 17:21:46,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:21:46,300 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:46,301 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 17:21:46,315 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:46,515 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (80)] Ended with exit code 0 [2021-11-23 17:21:46,735 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:46,914 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:46,914 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:46,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:46,914 INFO L85 PathProgramCache]: Analyzing trace with hash -803262144, now seen corresponding path program 1 times [2021-11-23 17:21:46,915 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:46,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [242313767] [2021-11-23 17:21:46,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:46,915 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:46,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:46,916 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:46,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Waiting until timeout for monitored process [2021-11-23 17:21:47,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:47,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:47,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:48,895 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 17:21:48,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:49,630 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 17:21:49,630 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:49,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [242313767] [2021-11-23 17:21:49,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [242313767] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:49,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1065954968] [2021-11-23 17:21:49,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:49,631 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:49,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:21:49,631 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:21:49,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (83)] Waiting until timeout for monitored process [2021-11-23 17:21:49,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:49,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:49,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:51,505 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 17:21:51,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:52,131 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 17:21:52,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1065954968] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:52,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1531955720] [2021-11-23 17:21:52,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:52,132 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:52,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:21:52,132 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:21:52,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2021-11-23 17:21:52,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:52,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:52,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:54,044 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 17:21:54,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:54,669 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 17:21:54,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1531955720] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:54,670 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:21:54,670 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:21:54,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016599515] [2021-11-23 17:21:54,670 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:21:54,671 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:21:54,671 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:54,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:21:54,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:21:54,672 INFO L87 Difference]: Start difference. First operand 4640 states and 6532 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 17:21:55,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:55,270 INFO L93 Difference]: Finished difference Result 6829 states and 9295 transitions. [2021-11-23 17:21:55,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:21:55,270 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 17:21:55,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:55,277 INFO L225 Difference]: With dead ends: 6829 [2021-11-23 17:21:55,277 INFO L226 Difference]: Without dead ends: 6012 [2021-11-23 17:21:55,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 675 GetRequests, 654 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2021-11-23 17:21:55,280 INFO L933 BasicCegarLoop]: 1522 mSDtfsCounter, 4428 mSDsluCounter, 10590 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4428 SdHoareTripleChecker+Valid, 12112 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 60 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:55,280 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4428 Valid, 12112 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 36 Invalid, 0 Unknown, 60 Unchecked, 0.1s Time] [2021-11-23 17:21:55,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6012 states. [2021-11-23 17:21:55,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6012 to 5988. [2021-11-23 17:21:55,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5988 states, 5986 states have (on average 1.3676912796525225) internal successors, (8187), 5987 states have internal predecessors, (8187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:55,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5988 states to 5988 states and 8187 transitions. [2021-11-23 17:21:55,618 INFO L78 Accepts]: Start accepts. Automaton has 5988 states and 8187 transitions. Word has length 112 [2021-11-23 17:21:55,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:55,618 INFO L470 AbstractCegarLoop]: Abstraction has 5988 states and 8187 transitions. [2021-11-23 17:21:55,618 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 17:21:55,619 INFO L276 IsEmpty]: Start isEmpty. Operand 5988 states and 8187 transitions. [2021-11-23 17:21:55,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:21:55,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:55,622 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 17:21:55,654 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:55,851 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Ended with exit code 0 [2021-11-23 17:21:56,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (83)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:56,243 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:56,243 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:56,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:56,243 INFO L85 PathProgramCache]: Analyzing trace with hash -7680944, now seen corresponding path program 1 times [2021-11-23 17:21:56,244 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:56,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2043546482] [2021-11-23 17:21:56,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:56,244 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:56,244 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:56,246 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:56,249 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (85)] Waiting until timeout for monitored process [2021-11-23 17:21:56,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:56,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:21:56,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:57,338 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 17:21:57,339 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:21:57,339 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:57,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2043546482] [2021-11-23 17:21:57,339 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2043546482] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:21:57,339 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:21:57,339 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:21:57,339 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135502098] [2021-11-23 17:21:57,339 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:21:57,340 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:21:57,340 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:57,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:21:57,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:21:57,340 INFO L87 Difference]: Start difference. First operand 5988 states and 8187 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 17:21:57,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:57,689 INFO L93 Difference]: Finished difference Result 6928 states and 9398 transitions. [2021-11-23 17:21:57,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:21:57,690 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 17:21:57,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:57,696 INFO L225 Difference]: With dead ends: 6928 [2021-11-23 17:21:57,696 INFO L226 Difference]: Without dead ends: 6472 [2021-11-23 17:21:57,697 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 17:21:57,698 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 2941 mSDsluCounter, 3028 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2941 SdHoareTripleChecker+Valid, 4549 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 44 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:57,698 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2941 Valid, 4549 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 44 Unchecked, 0.0s Time] [2021-11-23 17:21:57,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6472 states. [2021-11-23 17:21:58,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6472 to 6446. [2021-11-23 17:21:58,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6446 states, 6444 states have (on average 1.3558348851644941) internal successors, (8737), 6445 states have internal predecessors, (8737), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:58,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6446 states to 6446 states and 8737 transitions. [2021-11-23 17:21:58,087 INFO L78 Accepts]: Start accepts. Automaton has 6446 states and 8737 transitions. Word has length 112 [2021-11-23 17:21:58,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:58,087 INFO L470 AbstractCegarLoop]: Abstraction has 6446 states and 8737 transitions. [2021-11-23 17:21:58,087 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 17:21:58,087 INFO L276 IsEmpty]: Start isEmpty. Operand 6446 states and 8737 transitions. [2021-11-23 17:21:58,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:21:58,090 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:58,091 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 17:21:58,110 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (85)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:58,306 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:21:58,306 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:58,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:58,307 INFO L85 PathProgramCache]: Analyzing trace with hash 1933874233, now seen corresponding path program 1 times [2021-11-23 17:21:58,307 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:58,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [119899072] [2021-11-23 17:21:58,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:58,307 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:58,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:58,309 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:58,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Waiting until timeout for monitored process [2021-11-23 17:21:58,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:58,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:21:58,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:00,194 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 17:22:00,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:00,855 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 17:22:00,856 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:00,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [119899072] [2021-11-23 17:22:00,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [119899072] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:00,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [330337726] [2021-11-23 17:22:00,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:00,856 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:00,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:00,857 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:00,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Waiting until timeout for monitored process [2021-11-23 17:22:00,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:00,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:22:00,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:02,671 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 17:22:02,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:03,178 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 17:22:03,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [330337726] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:03,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [875697597] [2021-11-23 17:22:03,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:03,179 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:03,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:03,180 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:03,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-23 17:22:03,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:03,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:22:03,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:04,952 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 17:22:04,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:05,452 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 17:22:05,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [875697597] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:05,452 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:05,453 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:22:05,453 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268598573] [2021-11-23 17:22:05,453 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:05,454 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:22:05,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:05,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:22:05,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:22:05,454 INFO L87 Difference]: Start difference. First operand 6446 states and 8737 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 17:22:06,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:06,470 INFO L93 Difference]: Finished difference Result 10609 states and 14000 transitions. [2021-11-23 17:22:06,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 17:22:06,471 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 17:22:06,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:06,481 INFO L225 Difference]: With dead ends: 10609 [2021-11-23 17:22:06,481 INFO L226 Difference]: Without dead ends: 9777 [2021-11-23 17:22:06,484 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 680 GetRequests, 654 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=143, Invalid=613, Unknown=0, NotChecked=0, Total=756 [2021-11-23 17:22:06,484 INFO L933 BasicCegarLoop]: 1537 mSDtfsCounter, 8841 mSDsluCounter, 9398 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8841 SdHoareTripleChecker+Valid, 10935 SdHoareTripleChecker+Invalid, 176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 115 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:06,485 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8841 Valid, 10935 Invalid, 176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 57 Invalid, 0 Unknown, 115 Unchecked, 0.1s Time] [2021-11-23 17:22:06,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9777 states. [2021-11-23 17:22:07,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9777 to 9342. [2021-11-23 17:22:07,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9342 states, 9340 states have (on average 1.3176659528907924) internal successors, (12307), 9341 states have internal predecessors, (12307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:07,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9342 states to 9342 states and 12307 transitions. [2021-11-23 17:22:07,208 INFO L78 Accepts]: Start accepts. Automaton has 9342 states and 12307 transitions. Word has length 112 [2021-11-23 17:22:07,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:07,208 INFO L470 AbstractCegarLoop]: Abstraction has 9342 states and 12307 transitions. [2021-11-23 17:22:07,209 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 17:22:07,209 INFO L276 IsEmpty]: Start isEmpty. Operand 9342 states and 12307 transitions. [2021-11-23 17:22:07,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:22:07,213 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:07,213 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 17:22:07,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:07,430 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Ended with exit code 0 [2021-11-23 17:22:07,651 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Ended with exit code 0 [2021-11-23 17:22:07,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:07,827 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:07,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:07,827 INFO L85 PathProgramCache]: Analyzing trace with hash 228754537, now seen corresponding path program 1 times [2021-11-23 17:22:07,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:07,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2054105564] [2021-11-23 17:22:07,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:07,828 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:07,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:07,829 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:07,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Waiting until timeout for monitored process [2021-11-23 17:22:07,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:07,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:22:07,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:10,278 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 17:22:10,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:11,186 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 17:22:11,187 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:11,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2054105564] [2021-11-23 17:22:11,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2054105564] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:11,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [88528175] [2021-11-23 17:22:11,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:11,187 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:11,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:11,188 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:11,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Waiting until timeout for monitored process [2021-11-23 17:22:11,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:11,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:22:11,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:13,441 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 17:22:13,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:14,242 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 17:22:14,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [88528175] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:14,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2048068198] [2021-11-23 17:22:14,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:14,242 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:14,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:14,243 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:14,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2021-11-23 17:22:14,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:14,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:22:14,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:16,070 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 17:22:16,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:16,604 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 17:22:16,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2048068198] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:16,604 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:16,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:22:16,605 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689878484] [2021-11-23 17:22:16,605 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:16,606 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:22:16,606 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:16,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:22:16,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:22:16,607 INFO L87 Difference]: Start difference. First operand 9342 states and 12307 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 17:22:18,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:18,962 INFO L93 Difference]: Finished difference Result 10566 states and 13845 transitions. [2021-11-23 17:22:18,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:22:18,962 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 17:22:18,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:18,972 INFO L225 Difference]: With dead ends: 10566 [2021-11-23 17:22:18,972 INFO L226 Difference]: Without dead ends: 10114 [2021-11-23 17:22:18,975 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 694 GetRequests, 643 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=315, Invalid=2235, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 17:22:18,976 INFO L933 BasicCegarLoop]: 1553 mSDtfsCounter, 13141 mSDsluCounter, 26399 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13141 SdHoareTripleChecker+Valid, 27952 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 158 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:18,976 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13141 Valid, 27952 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 81 Invalid, 0 Unknown, 158 Unchecked, 0.1s Time] [2021-11-23 17:22:18,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10114 states. [2021-11-23 17:22:19,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10114 to 10051. [2021-11-23 17:22:19,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10051 states, 10049 states have (on average 1.312468902378346) internal successors, (13189), 10050 states have internal predecessors, (13189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:19,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10051 states to 10051 states and 13189 transitions. [2021-11-23 17:22:19,715 INFO L78 Accepts]: Start accepts. Automaton has 10051 states and 13189 transitions. Word has length 112 [2021-11-23 17:22:19,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:19,716 INFO L470 AbstractCegarLoop]: Abstraction has 10051 states and 13189 transitions. [2021-11-23 17:22:19,716 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 17:22:19,716 INFO L276 IsEmpty]: Start isEmpty. Operand 10051 states and 13189 transitions. [2021-11-23 17:22:19,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:22:19,720 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:19,720 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 17:22:19,725 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:19,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:20,145 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Ended with exit code 0 [2021-11-23 17:22:20,321 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:20,321 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:20,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:20,321 INFO L85 PathProgramCache]: Analyzing trace with hash 724787817, now seen corresponding path program 1 times [2021-11-23 17:22:20,322 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:20,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [682298289] [2021-11-23 17:22:20,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:20,322 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:20,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:20,323 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:20,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Waiting until timeout for monitored process [2021-11-23 17:22:20,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:20,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:22:20,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:21,392 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 17:22:21,392 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:21,392 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:21,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [682298289] [2021-11-23 17:22:21,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [682298289] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:21,392 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:21,392 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:22:21,393 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113277962] [2021-11-23 17:22:21,393 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:21,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:22:21,393 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:21,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:22:21,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:22:21,394 INFO L87 Difference]: Start difference. First operand 10051 states and 13189 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 17:22:22,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:22,092 INFO L93 Difference]: Finished difference Result 11279 states and 14754 transitions. [2021-11-23 17:22:22,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:22:22,093 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 17:22:22,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:22,103 INFO L225 Difference]: With dead ends: 11279 [2021-11-23 17:22:22,103 INFO L226 Difference]: Without dead ends: 10361 [2021-11-23 17:22:22,105 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 17:22:22,105 INFO L933 BasicCegarLoop]: 1526 mSDtfsCounter, 2958 mSDsluCounter, 1588 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2958 SdHoareTripleChecker+Valid, 3114 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 60 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:22,106 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2958 Valid, 3114 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 60 Unchecked, 0.0s Time] [2021-11-23 17:22:22,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10361 states. [2021-11-23 17:22:22,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10361 to 10339. [2021-11-23 17:22:22,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10339 states, 10337 states have (on average 1.3016349037438328) internal successors, (13455), 10338 states have internal predecessors, (13455), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:22,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10339 states to 10339 states and 13455 transitions. [2021-11-23 17:22:22,856 INFO L78 Accepts]: Start accepts. Automaton has 10339 states and 13455 transitions. Word has length 112 [2021-11-23 17:22:22,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:22,857 INFO L470 AbstractCegarLoop]: Abstraction has 10339 states and 13455 transitions. [2021-11-23 17:22:22,857 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 17:22:22,857 INFO L276 IsEmpty]: Start isEmpty. Operand 10339 states and 13455 transitions. [2021-11-23 17:22:22,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:22:22,860 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:22,861 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 17:22:22,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:23,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:23,061 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:23,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:23,062 INFO L85 PathProgramCache]: Analyzing trace with hash 1117709487, now seen corresponding path program 1 times [2021-11-23 17:22:23,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:23,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1791877077] [2021-11-23 17:22:23,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:23,063 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:23,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:23,064 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:23,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (93)] Waiting until timeout for monitored process [2021-11-23 17:22:23,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:23,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:22:23,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:30,853 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 17:22:30,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:33,952 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 17:22:33,952 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:33,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1791877077] [2021-11-23 17:22:33,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1791877077] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:33,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2131242379] [2021-11-23 17:22:33,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:33,952 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:33,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:33,953 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:33,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (94)] Waiting until timeout for monitored process [2021-11-23 17:22:34,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:34,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 17:22:34,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:43,745 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 17:22:43,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:48,113 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 17:22:48,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2131242379] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:48,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196807524] [2021-11-23 17:22:48,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:48,113 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:48,113 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:48,114 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:48,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Waiting until timeout for monitored process [2021-11-23 17:22:48,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:48,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:22:48,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:57,697 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 17:22:57,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:00,852 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 17:23:00,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1196807524] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:00,852 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:00,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20, 30, 24, 22, 17] total 105 [2021-11-23 17:23:00,853 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472432933] [2021-11-23 17:23:00,853 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:00,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2021-11-23 17:23:00,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:00,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2021-11-23 17:23:00,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=980, Invalid=9940, Unknown=0, NotChecked=0, Total=10920 [2021-11-23 17:23:00,856 INFO L87 Difference]: Start difference. First operand 10339 states and 13455 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 17:23:14,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:14,349 INFO L93 Difference]: Finished difference Result 16179 states and 20533 transitions. [2021-11-23 17:23:14,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-11-23 17:23:14,350 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 17:23:14,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:14,363 INFO L225 Difference]: With dead ends: 16179 [2021-11-23 17:23:14,364 INFO L226 Difference]: Without dead ends: 14605 [2021-11-23 17:23:14,369 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 715 GetRequests, 570 SyntacticMatches, 2 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8002 ImplicationChecksByTransitivity, 25.6s TimeCoverageRelationStatistics Valid=1598, Invalid=19282, Unknown=0, NotChecked=0, Total=20880 [2021-11-23 17:23:14,370 INFO L933 BasicCegarLoop]: 1670 mSDtfsCounter, 22369 mSDsluCounter, 39143 mSDsCounter, 0 mSdLazyCounter, 2118 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22369 SdHoareTripleChecker+Valid, 40813 SdHoareTripleChecker+Invalid, 2492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 2118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 294 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:14,370 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22369 Valid, 40813 Invalid, 2492 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [80 Valid, 2118 Invalid, 0 Unknown, 294 Unchecked, 3.9s Time] [2021-11-23 17:23:14,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14605 states. [2021-11-23 17:23:15,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14605 to 13285. [2021-11-23 17:23:15,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13285 states, 13283 states have (on average 1.2855529624331852) internal successors, (17076), 13284 states have internal predecessors, (17076), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:15,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13285 states to 13285 states and 17076 transitions. [2021-11-23 17:23:15,347 INFO L78 Accepts]: Start accepts. Automaton has 13285 states and 17076 transitions. Word has length 113 [2021-11-23 17:23:15,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:15,433 INFO L470 AbstractCegarLoop]: Abstraction has 13285 states and 17076 transitions. [2021-11-23 17:23:15,433 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 17:23:15,433 INFO L276 IsEmpty]: Start isEmpty. Operand 13285 states and 17076 transitions. [2021-11-23 17:23:15,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:23:15,436 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:15,436 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 17:23:15,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (94)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:15,662 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Ended with exit code 0 [2021-11-23 17:23:15,847 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (93)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:16,037 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:23:16,037 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:16,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:16,038 INFO L85 PathProgramCache]: Analyzing trace with hash 2048005298, now seen corresponding path program 1 times [2021-11-23 17:23:16,038 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:16,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1613007640] [2021-11-23 17:23:16,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:16,039 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:16,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:16,041 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:16,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (96)] Waiting until timeout for monitored process [2021-11-23 17:23:16,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:16,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:23:16,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:17,523 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 17:23:17,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:18,209 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 17:23:18,209 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:18,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1613007640] [2021-11-23 17:23:18,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1613007640] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:18,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1730767191] [2021-11-23 17:23:18,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:18,210 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:18,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:18,211 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:18,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (97)] Waiting until timeout for monitored process [2021-11-23 17:23:18,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:18,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:23:18,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:19,988 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 17:23:19,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:20,384 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 17:23:20,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1730767191] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:20,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1059373483] [2021-11-23 17:23:20,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:20,385 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:20,385 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:20,386 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:20,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Waiting until timeout for monitored process [2021-11-23 17:23:20,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:20,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:23:20,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:21,442 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 17:23:21,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:21,848 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 17:23:21,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1059373483] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:21,848 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:21,848 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 15, 11, 12, 11] total 33 [2021-11-23 17:23:21,849 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030596831] [2021-11-23 17:23:21,849 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:21,849 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-23 17:23:21,849 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:21,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-23 17:23:21,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=893, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 17:23:21,850 INFO L87 Difference]: Start difference. First operand 13285 states and 17076 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 17:23:24,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:24,414 INFO L93 Difference]: Finished difference Result 26146 states and 33325 transitions. [2021-11-23 17:23:24,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-23 17:23:24,415 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 17:23:24,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:24,437 INFO L225 Difference]: With dead ends: 26146 [2021-11-23 17:23:24,437 INFO L226 Difference]: Without dead ends: 21169 [2021-11-23 17:23:24,445 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 688 GetRequests, 645 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 529 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=271, Invalid=1535, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 17:23:24,445 INFO L933 BasicCegarLoop]: 1663 mSDtfsCounter, 6324 mSDsluCounter, 18018 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6324 SdHoareTripleChecker+Valid, 19681 SdHoareTripleChecker+Invalid, 372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 129 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:24,448 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6324 Valid, 19681 Invalid, 372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 235 Invalid, 0 Unknown, 129 Unchecked, 0.3s Time] [2021-11-23 17:23:24,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21169 states. [2021-11-23 17:23:25,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21169 to 18275. [2021-11-23 17:23:25,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18275 states, 18273 states have (on average 1.2782247031138838) internal successors, (23357), 18274 states have internal predecessors, (23357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:26,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18275 states to 18275 states and 23357 transitions. [2021-11-23 17:23:26,000 INFO L78 Accepts]: Start accepts. Automaton has 18275 states and 23357 transitions. Word has length 113 [2021-11-23 17:23:26,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:26,001 INFO L470 AbstractCegarLoop]: Abstraction has 18275 states and 23357 transitions. [2021-11-23 17:23:26,001 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 17:23:26,001 INFO L276 IsEmpty]: Start isEmpty. Operand 18275 states and 23357 transitions. [2021-11-23 17:23:26,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:23:26,004 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:26,004 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 17:23:26,015 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (96)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:26,229 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Ended with exit code 0 [2021-11-23 17:23:26,406 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (97)] Ended with exit code 0 [2021-11-23 17:23:26,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:26,605 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:26,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:26,606 INFO L85 PathProgramCache]: Analyzing trace with hash -1844428728, now seen corresponding path program 1 times [2021-11-23 17:23:26,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:26,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [874466633] [2021-11-23 17:23:26,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:26,606 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:26,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:26,607 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:26,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (99)] Waiting until timeout for monitored process [2021-11-23 17:23:26,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:26,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:23:26,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:28,262 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 17:23:28,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:29,100 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 17:23:29,100 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:29,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [874466633] [2021-11-23 17:23:29,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [874466633] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:29,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1808324049] [2021-11-23 17:23:29,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:29,101 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:29,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:29,101 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:29,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (100)] Waiting until timeout for monitored process [2021-11-23 17:23:29,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:29,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:23:29,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:30,642 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 17:23:30,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:31,167 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 17:23:31,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1808324049] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:31,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1983170060] [2021-11-23 17:23:31,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:31,168 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:31,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:31,170 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:31,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Waiting until timeout for monitored process [2021-11-23 17:23:31,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:31,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:23:31,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:37,275 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 17:23:37,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:38,703 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 17:23:38,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1983170060] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:38,703 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:38,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 14, 11, 21, 15] total 48 [2021-11-23 17:23:38,703 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649445999] [2021-11-23 17:23:38,704 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:38,704 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:23:38,704 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:38,705 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:23:38,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=256, Invalid=2000, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:23:38,705 INFO L87 Difference]: Start difference. First operand 18275 states and 23357 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 17:23:42,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:42,965 INFO L93 Difference]: Finished difference Result 34625 states and 44016 transitions. [2021-11-23 17:23:42,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-23 17:23:42,966 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 17:23:42,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:43,014 INFO L225 Difference]: With dead ends: 34625 [2021-11-23 17:23:43,015 INFO L226 Difference]: Without dead ends: 28515 [2021-11-23 17:23:43,027 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 700 GetRequests, 633 SyntacticMatches, 7 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1262 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=437, Invalid=3345, Unknown=0, NotChecked=0, Total=3782 [2021-11-23 17:23:43,028 INFO L933 BasicCegarLoop]: 1575 mSDtfsCounter, 13474 mSDsluCounter, 27292 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13474 SdHoareTripleChecker+Valid, 28867 SdHoareTripleChecker+Invalid, 563 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 272 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:43,028 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13474 Valid, 28867 Invalid, 563 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 273 Invalid, 0 Unknown, 272 Unchecked, 0.5s Time] [2021-11-23 17:23:43,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28515 states. [2021-11-23 17:23:45,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28515 to 26038. [2021-11-23 17:23:45,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26038 states, 26036 states have (on average 1.277039483791673) internal successors, (33249), 26037 states have internal predecessors, (33249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:45,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26038 states to 26038 states and 33249 transitions. [2021-11-23 17:23:45,563 INFO L78 Accepts]: Start accepts. Automaton has 26038 states and 33249 transitions. Word has length 113 [2021-11-23 17:23:45,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:45,564 INFO L470 AbstractCegarLoop]: Abstraction has 26038 states and 33249 transitions. [2021-11-23 17:23:45,564 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 17:23:45,564 INFO L276 IsEmpty]: Start isEmpty. Operand 26038 states and 33249 transitions. [2021-11-23 17:23:45,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:23:45,568 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:45,568 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 17:23:45,583 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (100)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:45,795 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Ended with exit code 0 [2021-11-23 17:23:45,981 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (99)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:46,171 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:23:46,171 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:46,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:46,172 INFO L85 PathProgramCache]: Analyzing trace with hash 588226190, now seen corresponding path program 1 times [2021-11-23 17:23:46,172 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:46,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [292362061] [2021-11-23 17:23:46,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:46,172 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:46,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:46,174 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:46,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Waiting until timeout for monitored process [2021-11-23 17:23:46,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:46,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:23:46,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:54,305 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 17:23:54,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:59,096 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 17:23:59,096 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:59,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [292362061] [2021-11-23 17:23:59,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [292362061] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:59,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1794379573] [2021-11-23 17:23:59,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:59,097 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:59,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:59,103 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:59,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Waiting until timeout for monitored process [2021-11-23 17:23:59,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:59,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 17:23:59,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:09,423 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 17:24:09,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:18,576 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 17:24:18,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1794379573] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:18,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [554047449] [2021-11-23 17:24:18,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:18,577 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:18,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:18,578 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:18,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2021-11-23 17:24:18,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:18,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 17:24:18,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:25,294 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 17:24:25,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:31,961 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 17:24:31,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [554047449] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:31,962 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:31,963 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 30, 28, 24, 24] total 133 [2021-11-23 17:24:31,963 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791978136] [2021-11-23 17:24:31,963 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:31,964 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2021-11-23 17:24:31,964 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:31,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2021-11-23 17:24:31,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2045, Invalid=15511, Unknown=0, NotChecked=0, Total=17556 [2021-11-23 17:24:31,967 INFO L87 Difference]: Start difference. First operand 26038 states and 33249 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 17:24:57,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:57,949 INFO L93 Difference]: Finished difference Result 34330 states and 43441 transitions. [2021-11-23 17:24:57,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-11-23 17:24:57,950 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 17:24:57,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:57,989 INFO L225 Difference]: With dead ends: 34330 [2021-11-23 17:24:57,989 INFO L226 Difference]: Without dead ends: 28983 [2021-11-23 17:24:58,001 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 732 GetRequests, 554 SyntacticMatches, 2 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11323 ImplicationChecksByTransitivity, 44.9s TimeCoverageRelationStatistics Valid=3518, Invalid=27988, Unknown=0, NotChecked=0, Total=31506 [2021-11-23 17:24:58,001 INFO L933 BasicCegarLoop]: 1576 mSDtfsCounter, 49069 mSDsluCounter, 47347 mSDsCounter, 0 mSdLazyCounter, 2572 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49069 SdHoareTripleChecker+Valid, 48923 SdHoareTripleChecker+Invalid, 2956 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 2572 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 289 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:58,002 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49069 Valid, 48923 Invalid, 2956 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [95 Valid, 2572 Invalid, 0 Unknown, 289 Unchecked, 5.6s Time] [2021-11-23 17:24:58,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28983 states. [2021-11-23 17:25:00,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28983 to 26028. [2021-11-23 17:25:00,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26028 states, 26026 states have (on average 1.2774533159148544) internal successors, (33247), 26027 states have internal predecessors, (33247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:00,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26028 states to 26028 states and 33247 transitions. [2021-11-23 17:25:00,365 INFO L78 Accepts]: Start accepts. Automaton has 26028 states and 33247 transitions. Word has length 113 [2021-11-23 17:25:00,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:00,365 INFO L470 AbstractCegarLoop]: Abstraction has 26028 states and 33247 transitions. [2021-11-23 17:25:00,365 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 17:25:00,366 INFO L276 IsEmpty]: Start isEmpty. Operand 26028 states and 33247 transitions. [2021-11-23 17:25:00,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:25:00,368 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:00,368 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 17:25:00,382 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:00,592 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:00,771 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:00,970 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:00,970 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:00,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:00,971 INFO L85 PathProgramCache]: Analyzing trace with hash -1890239409, now seen corresponding path program 1 times [2021-11-23 17:25:00,971 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:00,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1977384198] [2021-11-23 17:25:00,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:00,971 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:00,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:00,972 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:00,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Waiting until timeout for monitored process [2021-11-23 17:25:01,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:01,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:25:01,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:02,645 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 17:25:02,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:03,514 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 17:25:03,514 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:03,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1977384198] [2021-11-23 17:25:03,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1977384198] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:03,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [171776419] [2021-11-23 17:25:03,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:03,515 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:03,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:03,516 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:03,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (106)] Waiting until timeout for monitored process [2021-11-23 17:25:03,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:03,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-23 17:25:03,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:11,867 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 17:25:11,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:17,657 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 17:25:17,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [171776419] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:17,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [649870122] [2021-11-23 17:25:17,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:17,658 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:17,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:17,659 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:17,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Waiting until timeout for monitored process [2021-11-23 17:25:17,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:17,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:25:17,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:19,325 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 17:25:19,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:19,870 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 17:25:19,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [649870122] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:19,870 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:19,871 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 32, 27, 12, 11] total 82 [2021-11-23 17:25:19,871 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189109992] [2021-11-23 17:25:19,871 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:19,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-23 17:25:19,872 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:19,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-23 17:25:19,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1001, Invalid=5641, Unknown=0, NotChecked=0, Total=6642 [2021-11-23 17:25:19,874 INFO L87 Difference]: Start difference. First operand 26028 states and 33247 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 17:26:12,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:26:12,157 INFO L93 Difference]: Finished difference Result 87778 states and 109958 transitions. [2021-11-23 17:26:12,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 224 states. [2021-11-23 17:26:12,158 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 17:26:12,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:26:12,268 INFO L225 Difference]: With dead ends: 87778 [2021-11-23 17:26:12,268 INFO L226 Difference]: Without dead ends: 77260 [2021-11-23 17:26:12,296 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 956 GetRequests, 672 SyntacticMatches, 18 SemanticMatches, 266 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29369 ImplicationChecksByTransitivity, 47.6s TimeCoverageRelationStatistics Valid=8430, Invalid=63126, Unknown=0, NotChecked=0, Total=71556 [2021-11-23 17:26:12,297 INFO L933 BasicCegarLoop]: 1624 mSDtfsCounter, 30878 mSDsluCounter, 36891 mSDsCounter, 0 mSdLazyCounter, 2385 mSolverCounterSat, 191 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30878 SdHoareTripleChecker+Valid, 38515 SdHoareTripleChecker+Invalid, 5380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 191 IncrementalHoareTripleChecker+Valid, 2385 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2804 IncrementalHoareTripleChecker+Unchecked, 5.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:26:12,297 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30878 Valid, 38515 Invalid, 5380 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [191 Valid, 2385 Invalid, 0 Unknown, 2804 Unchecked, 5.3s Time] [2021-11-23 17:26:12,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77260 states. [2021-11-23 17:26:18,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77260 to 51601. [2021-11-23 17:26:18,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51601 states, 51599 states have (on average 1.2674470435473555) internal successors, (65399), 51600 states have internal predecessors, (65399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:26:18,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51601 states to 51601 states and 65399 transitions. [2021-11-23 17:26:18,375 INFO L78 Accepts]: Start accepts. Automaton has 51601 states and 65399 transitions. Word has length 113 [2021-11-23 17:26:18,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:26:18,375 INFO L470 AbstractCegarLoop]: Abstraction has 51601 states and 65399 transitions. [2021-11-23 17:26:18,375 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 17:26:18,376 INFO L276 IsEmpty]: Start isEmpty. Operand 51601 states and 65399 transitions. [2021-11-23 17:26:18,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:26:18,378 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:26:18,378 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 17:26:18,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (106)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:18,587 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Ended with exit code 0 [2021-11-23 17:26:18,800 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Ended with exit code 0 [2021-11-23 17:26:18,979 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:18,979 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:26:18,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:26:18,980 INFO L85 PathProgramCache]: Analyzing trace with hash -959943598, now seen corresponding path program 1 times [2021-11-23 17:26:18,980 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:26:18,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1374207253] [2021-11-23 17:26:18,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:18,981 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:26:18,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:26:18,982 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:26:18,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Waiting until timeout for monitored process [2021-11-23 17:26:19,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:19,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 17:26:19,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:25,619 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 17:26:25,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:28,541 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 17:26:28,542 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:26:28,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1374207253] [2021-11-23 17:26:28,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1374207253] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:28,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [22139976] [2021-11-23 17:26:28,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:28,542 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:26:28,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:26:28,543 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:26:28,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Waiting until timeout for monitored process [2021-11-23 17:26:28,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:28,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:26:28,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:33,729 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 17:26:33,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:35,300 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 17:26:35,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [22139976] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:35,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1265460764] [2021-11-23 17:26:35,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:35,301 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:35,301 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:26:35,302 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:26:35,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2021-11-23 17:26:35,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:35,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:26:35,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:41,378 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 17:26:41,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:43,457 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 17:26:43,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1265460764] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:43,457 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:26:43,457 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21, 23, 21, 18, 18] total 74 [2021-11-23 17:26:43,458 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877482472] [2021-11-23 17:26:43,458 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:26:43,458 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-23 17:26:43,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:26:43,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-23 17:26:43,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=416, Invalid=4986, Unknown=0, NotChecked=0, Total=5402 [2021-11-23 17:26:43,459 INFO L87 Difference]: Start difference. First operand 51601 states and 65399 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 17:27:08,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:27:08,111 INFO L93 Difference]: Finished difference Result 99859 states and 125326 transitions. [2021-11-23 17:27:08,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2021-11-23 17:27:08,112 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 17:27:08,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:27:08,240 INFO L225 Difference]: With dead ends: 99859 [2021-11-23 17:27:08,240 INFO L226 Difference]: Without dead ends: 88704 [2021-11-23 17:27:08,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 751 GetRequests, 607 SyntacticMatches, 1 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8310 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=1232, Invalid=19648, Unknown=0, NotChecked=0, Total=20880 [2021-11-23 17:27:08,264 INFO L933 BasicCegarLoop]: 1791 mSDtfsCounter, 20944 mSDsluCounter, 41869 mSDsCounter, 0 mSdLazyCounter, 2545 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20944 SdHoareTripleChecker+Valid, 43660 SdHoareTripleChecker+Invalid, 3283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 2545 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 692 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:27:08,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20944 Valid, 43660 Invalid, 3283 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [46 Valid, 2545 Invalid, 0 Unknown, 692 Unchecked, 4.6s Time] [2021-11-23 17:27:08,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88704 states. [2021-11-23 17:27:17,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88704 to 70391. [2021-11-23 17:27:17,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70391 states, 70389 states have (on average 1.266888292204748) internal successors, (89175), 70390 states have internal predecessors, (89175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:27:17,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70391 states to 70391 states and 89175 transitions. [2021-11-23 17:27:17,822 INFO L78 Accepts]: Start accepts. Automaton has 70391 states and 89175 transitions. Word has length 113 [2021-11-23 17:27:17,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:27:17,823 INFO L470 AbstractCegarLoop]: Abstraction has 70391 states and 89175 transitions. [2021-11-23 17:27:17,823 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 17:27:17,823 INFO L276 IsEmpty]: Start isEmpty. Operand 70391 states and 89175 transitions. [2021-11-23 17:27:17,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:27:17,826 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:27:17,826 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:27:17,832 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Forceful destruction successful, exit code 0 [2021-11-23 17:27:18,037 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Forceful destruction successful, exit code 0 [2021-11-23 17:27:18,252 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Ended with exit code 0 [2021-11-23 17:27:18,427 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:27:18,427 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:27:18,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:27:18,428 INFO L85 PathProgramCache]: Analyzing trace with hash 449119195, now seen corresponding path program 1 times [2021-11-23 17:27:18,428 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:27:18,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [167910299] [2021-11-23 17:27:18,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:27:18,428 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:27:18,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:27:18,430 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:27:18,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Waiting until timeout for monitored process [2021-11-23 17:27:18,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:27:18,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:27:18,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:19,293 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 44 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:19,294 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:27:19,294 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:27:19,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [167910299] [2021-11-23 17:27:19,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [167910299] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:27:19,294 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:27:19,294 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:27:19,294 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416387125] [2021-11-23 17:27:19,294 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:27:19,295 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:27:19,295 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:27:19,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:27:19,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:27:19,296 INFO L87 Difference]: Start difference. First operand 70391 states and 89175 transitions. Second operand has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:05,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:05,333 INFO L93 Difference]: Finished difference Result 72646 states and 93074 transitions. [2021-11-23 17:28:05,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:05,334 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 0 states have call successors, (0), 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 17:28:05,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:05,432 INFO L225 Difference]: With dead ends: 72646 [2021-11-23 17:28:05,432 INFO L226 Difference]: Without dead ends: 71142 [2021-11-23 17:28:05,444 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 111 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 17:28:05,445 INFO L933 BasicCegarLoop]: 656 mSDtfsCounter, 766 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2295 mSolverCounterSat, 362 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 31.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 766 SdHoareTripleChecker+Valid, 663 SdHoareTripleChecker+Invalid, 2657 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 362 IncrementalHoareTripleChecker+Valid, 2295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 37.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:05,446 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [766 Valid, 663 Invalid, 2657 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [362 Valid, 2295 Invalid, 0 Unknown, 0 Unchecked, 37.6s Time] [2021-11-23 17:28:05,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71142 states. [2021-11-23 17:28:14,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71142 to 71142. [2021-11-23 17:28:14,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71142 states, 71140 states have (on average 1.265757660950239) internal successors, (90046), 71141 states have internal predecessors, (90046), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:14,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71142 states to 71142 states and 90046 transitions. [2021-11-23 17:28:14,430 INFO L78 Accepts]: Start accepts. Automaton has 71142 states and 90046 transitions. Word has length 113 [2021-11-23 17:28:14,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:14,430 INFO L470 AbstractCegarLoop]: Abstraction has 71142 states and 90046 transitions. [2021-11-23 17:28:14,430 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:14,430 INFO L276 IsEmpty]: Start isEmpty. Operand 71142 states and 90046 transitions. [2021-11-23 17:28:14,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 17:28:14,433 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:14,433 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 17:28:14,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:14,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:14,634 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:14,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:14,634 INFO L85 PathProgramCache]: Analyzing trace with hash 1781048702, now seen corresponding path program 1 times [2021-11-23 17:28:14,635 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:14,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2053832250] [2021-11-23 17:28:14,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:14,635 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:14,635 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:14,636 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:14,637 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (112)] Waiting until timeout for monitored process [2021-11-23 17:28:14,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:14,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:28:14,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:20,553 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 17:28:20,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:23,050 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 17:28:23,050 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:23,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2053832250] [2021-11-23 17:28:23,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2053832250] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:23,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1887284960] [2021-11-23 17:28:23,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:23,051 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:23,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:28:23,052 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:28:23,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (113)] Waiting until timeout for monitored process [2021-11-23 17:28:23,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:23,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:28:23,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:28,409 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 17:28:28,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:29,260 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 17:28:29,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1887284960] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:29,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1233688698] [2021-11-23 17:28:29,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:29,260 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:28:29,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:28:29,262 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:28:29,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18c28b99-28bd-4c05-9de9-340ea61332af/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Waiting until timeout for monitored process [2021-11-23 17:28:29,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:29,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:28:29,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:34,927 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 17:28:34,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:36,059 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 17:28:36,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1233688698] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:36,060 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:28:36,060 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19, 18, 18, 17] total 51 [2021-11-23 17:28:36,060 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749867083] [2021-11-23 17:28:36,061 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:28:36,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 17:28:36,061 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:36,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 17:28:36,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=2336, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 17:28:36,062 INFO L87 Difference]: Start difference. First operand 71142 states and 90046 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)