./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pals_lcr.3_overflow.ufo.UNBOUNDED.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_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/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_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.3_overflow.ufo.UNBOUNDED.pals+Problem12_label01.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/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_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/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 7fcfcf7d93c3fc85869efa536862a56a3ba120e3589f116e608720bbd1f279d7 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:05:53,464 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:05:53,467 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:05:53,530 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:05:53,531 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:05:53,536 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:05:53,538 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:05:53,543 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:05:53,547 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:05:53,554 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:05:53,555 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:05:53,558 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:05:53,558 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:05:53,561 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:05:53,565 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:05:53,570 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:05:53,571 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:05:53,572 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:05:53,573 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:05:53,576 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:05:53,579 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:05:53,580 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:05:53,584 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:05:53,586 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:05:53,600 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:05:53,600 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:05:53,601 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:05:53,603 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:05:53,604 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:05:53,606 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:05:53,607 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:05:53,608 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:05:53,610 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:05:53,612 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:05:53,614 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:05:53,615 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:05:53,616 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:05:53,616 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:05:53,616 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:05:53,618 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:05:53,619 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:05:53,620 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:05:53,671 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:05:53,672 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:05:53,672 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:05:53,673 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:05:53,681 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:05:53,682 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:05:53,682 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:05:53,682 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:05:53,682 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:05:53,683 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:05:53,684 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:05:53,684 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:05:53,685 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:05:53,685 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:05:53,685 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:05:53,685 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:05:53,686 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:05:53,686 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:05:53,687 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:05:53,687 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:05:53,687 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:05:53,688 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:05:53,688 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:05:53,688 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:05:53,688 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:05:53,689 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:05:53,691 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:05:53,691 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:05:53,691 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:05:53,691 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:05:53,692 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:05:53,692 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:05:53,692 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:05:53,693 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:05:53,693 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:05:53,693 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:05:53,694 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:05:53,694 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:05:53,694 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:05:53,694 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:05:53,695 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:05:53,695 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_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7fcfcf7d93c3fc85869efa536862a56a3ba120e3589f116e608720bbd1f279d7 [2021-11-23 17:05:54,059 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:05:54,085 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:05:54,088 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:05:54,090 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:05:54,093 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:05:54,095 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.3_overflow.ufo.UNBOUNDED.pals+Problem12_label01.c [2021-11-23 17:05:54,180 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/data/3da531bda/f6c3872addaa462181d56057c543413b/FLAGb69192021 [2021-11-23 17:05:55,346 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:05:55,347 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/sv-benchmarks/c/combinations/pals_lcr.3_overflow.ufo.UNBOUNDED.pals+Problem12_label01.c [2021-11-23 17:05:55,393 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/data/3da531bda/f6c3872addaa462181d56057c543413b/FLAGb69192021 [2021-11-23 17:05:55,668 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/data/3da531bda/f6c3872addaa462181d56057c543413b [2021-11-23 17:05:55,671 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:05:55,673 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:05:55,675 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:05:55,675 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:05:55,680 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:05:55,681 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:05:55" (1/1) ... [2021-11-23 17:05:55,682 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1bd66fd6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:55, skipping insertion in model container [2021-11-23 17:05:55,683 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:05:55" (1/1) ... [2021-11-23 17:05:55,691 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:05:55,863 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:05:56,282 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_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/sv-benchmarks/c/combinations/pals_lcr.3_overflow.ufo.UNBOUNDED.pals+Problem12_label01.c[6524,6537] [2021-11-23 17:05:56,394 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_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/sv-benchmarks/c/combinations/pals_lcr.3_overflow.ufo.UNBOUNDED.pals+Problem12_label01.c[12079,12092] [2021-11-23 17:05:57,553 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:05:57,564 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:05:57,620 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_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/sv-benchmarks/c/combinations/pals_lcr.3_overflow.ufo.UNBOUNDED.pals+Problem12_label01.c[6524,6537] [2021-11-23 17:05:57,647 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_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/sv-benchmarks/c/combinations/pals_lcr.3_overflow.ufo.UNBOUNDED.pals+Problem12_label01.c[12079,12092] [2021-11-23 17:05:58,324 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:05:58,355 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:05:58,355 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:58 WrapperNode [2021-11-23 17:05:58,355 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:05:58,356 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:05:58,357 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:05:58,357 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:05:58,365 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:58" (1/1) ... [2021-11-23 17:05:58,431 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:58" (1/1) ... [2021-11-23 17:05:58,814 INFO L137 Inliner]: procedures = 35, calls = 20, calls flagged for inlining = 15, calls inlined = 15, statements flattened = 4974 [2021-11-23 17:05:58,814 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:05:58,815 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:05:58,816 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:05:58,816 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:05:58,826 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:58" (1/1) ... [2021-11-23 17:05:58,827 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:58" (1/1) ... [2021-11-23 17:05:59,024 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:58" (1/1) ... [2021-11-23 17:05:59,024 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:58" (1/1) ... [2021-11-23 17:05:59,395 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:58" (1/1) ... [2021-11-23 17:05:59,435 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:58" (1/1) ... [2021-11-23 17:05:59,465 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:58" (1/1) ... [2021-11-23 17:05:59,576 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:05:59,578 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:05:59,592 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:05:59,593 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:05:59,594 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:05:58" (1/1) ... [2021-11-23 17:05:59,603 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:05:59,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:05:59,637 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:05:59,669 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:05:59,692 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:05:59,692 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:05:59,692 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:05:59,693 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:05:59,805 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:05:59,807 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:06:05,063 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:06:05,114 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 17:06:05,126 INFO L158 Benchmark]: Toolchain (without parser) took 9450.61ms. Allocated memory was 102.8MB in the beginning and 580.9MB in the end (delta: 478.2MB). Free memory was 68.0MB in the beginning and 416.9MB in the end (delta: -349.0MB). Peak memory consumption was 267.4MB. Max. memory is 16.1GB. [2021-11-23 17:06:05,127 INFO L158 Benchmark]: CDTParser took 0.37ms. Allocated memory is still 83.9MB. Free memory was 57.3MB in the beginning and 57.3MB in the end (delta: 44.9kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:06:05,129 INFO L158 Benchmark]: CACSL2BoogieTranslator took 2680.94ms. Allocated memory was 102.8MB in the beginning and 163.6MB in the end (delta: 60.8MB). Free memory was 68.0MB in the beginning and 101.3MB in the end (delta: -33.3MB). Peak memory consumption was 73.3MB. Max. memory is 16.1GB. [2021-11-23 17:06:05,131 INFO L158 Benchmark]: Boogie Procedure Inliner took 458.05ms. Allocated memory is still 163.6MB. Free memory was 101.3MB in the beginning and 56.6MB in the end (delta: 44.7MB). Peak memory consumption was 63.8MB. Max. memory is 16.1GB. [2021-11-23 17:06:05,132 INFO L158 Benchmark]: Boogie Preprocessor took 761.33ms. Allocated memory was 163.6MB in the beginning and 327.2MB in the end (delta: 163.6MB). Free memory was 56.6MB in the beginning and 202.7MB in the end (delta: -146.1MB). Peak memory consumption was 34.9MB. Max. memory is 16.1GB. [2021-11-23 17:06:05,133 INFO L158 Benchmark]: RCFGBuilder took 5544.62ms. Allocated memory was 327.2MB in the beginning and 580.9MB in the end (delta: 253.8MB). Free memory was 202.7MB in the beginning and 416.9MB in the end (delta: -214.2MB). Peak memory consumption was 179.3MB. Max. memory is 16.1GB. [2021-11-23 17:06:05,143 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.37ms. Allocated memory is still 83.9MB. Free memory was 57.3MB in the beginning and 57.3MB in the end (delta: 44.9kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 2680.94ms. Allocated memory was 102.8MB in the beginning and 163.6MB in the end (delta: 60.8MB). Free memory was 68.0MB in the beginning and 101.3MB in the end (delta: -33.3MB). Peak memory consumption was 73.3MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 458.05ms. Allocated memory is still 163.6MB. Free memory was 101.3MB in the beginning and 56.6MB in the end (delta: 44.7MB). Peak memory consumption was 63.8MB. Max. memory is 16.1GB. * Boogie Preprocessor took 761.33ms. Allocated memory was 163.6MB in the beginning and 327.2MB in the end (delta: 163.6MB). Free memory was 56.6MB in the beginning and 202.7MB in the end (delta: -146.1MB). Peak memory consumption was 34.9MB. Max. memory is 16.1GB. * RCFGBuilder took 5544.62ms. Allocated memory was 327.2MB in the beginning and 580.9MB in the end (delta: 253.8MB). Free memory was 202.7MB in the beginning and 416.9MB in the end (delta: -214.2MB). Peak memory consumption was 179.3MB. 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 17:06:05,182 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/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_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/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_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.3_overflow.ufo.UNBOUNDED.pals+Problem12_label01.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/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_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/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 7fcfcf7d93c3fc85869efa536862a56a3ba120e3589f116e608720bbd1f279d7 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:06:07,887 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:06:07,891 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:06:07,948 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:06:07,949 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:06:07,956 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:06:07,957 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:06:07,959 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:06:07,962 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:06:07,963 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:06:07,964 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:06:07,966 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:06:07,967 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:06:07,968 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:06:07,970 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:06:07,971 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:06:07,973 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:06:07,974 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:06:07,976 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:06:07,979 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:06:07,981 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:06:07,983 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:06:07,984 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:06:07,986 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:06:07,990 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:06:07,990 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:06:07,991 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:06:07,992 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:06:07,993 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:06:07,994 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:06:07,994 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:06:07,995 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:06:07,996 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:06:07,997 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:06:07,999 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:06:07,999 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:06:08,000 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:06:08,000 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:06:08,001 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:06:08,002 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:06:08,003 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:06:08,003 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:06:08,031 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:06:08,032 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:06:08,032 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:06:08,032 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:06:08,033 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:06:08,033 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:06:08,033 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:06:08,034 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:06:08,034 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:06:08,034 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:06:08,034 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:06:08,034 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:06:08,035 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:06:08,036 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:06:08,036 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:06:08,036 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:06:08,036 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:06:08,036 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:06:08,036 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:06:08,036 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:06:08,037 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:06:08,037 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:06:08,037 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:06:08,037 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:06:08,037 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:06:08,038 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:06:08,038 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:06:08,038 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:06:08,038 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:06:08,039 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:06:08,039 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:06:08,039 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:06:08,039 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:06:08,040 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:06:08,040 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:06:08,040 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:06:08,040 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:06:08,040 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:06:08,041 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_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7fcfcf7d93c3fc85869efa536862a56a3ba120e3589f116e608720bbd1f279d7 [2021-11-23 17:06:08,449 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:06:08,491 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:06:08,495 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:06:08,497 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:06:08,498 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:06:08,499 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.3_overflow.ufo.UNBOUNDED.pals+Problem12_label01.c [2021-11-23 17:06:08,591 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/data/63645ce1a/9695a14fbcfa4e9cac28f25dc6d9a622/FLAG5de5ca02a [2021-11-23 17:06:09,600 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:06:09,601 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/sv-benchmarks/c/combinations/pals_lcr.3_overflow.ufo.UNBOUNDED.pals+Problem12_label01.c [2021-11-23 17:06:09,648 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/data/63645ce1a/9695a14fbcfa4e9cac28f25dc6d9a622/FLAG5de5ca02a [2021-11-23 17:06:10,010 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/data/63645ce1a/9695a14fbcfa4e9cac28f25dc6d9a622 [2021-11-23 17:06:10,015 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:06:10,018 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:06:10,020 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:06:10,020 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:06:10,025 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:06:10,026 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:06:10" (1/1) ... [2021-11-23 17:06:10,027 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2dcf5d0c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:06:10, skipping insertion in model container [2021-11-23 17:06:10,028 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:06:10" (1/1) ... [2021-11-23 17:06:10,036 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:06:10,206 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:06:10,617 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_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/sv-benchmarks/c/combinations/pals_lcr.3_overflow.ufo.UNBOUNDED.pals+Problem12_label01.c[6524,6537] [2021-11-23 17:06:10,749 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_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/sv-benchmarks/c/combinations/pals_lcr.3_overflow.ufo.UNBOUNDED.pals+Problem12_label01.c[12079,12092] [2021-11-23 17:06:11,917 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:06:11,932 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:06:11,986 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_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/sv-benchmarks/c/combinations/pals_lcr.3_overflow.ufo.UNBOUNDED.pals+Problem12_label01.c[6524,6537] [2021-11-23 17:06:12,008 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_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/sv-benchmarks/c/combinations/pals_lcr.3_overflow.ufo.UNBOUNDED.pals+Problem12_label01.c[12079,12092] [2021-11-23 17:06:12,766 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:06:12,799 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:06:12,800 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:06:12 WrapperNode [2021-11-23 17:06:12,800 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:06:12,801 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:06:12,802 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:06:12,802 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:06:12,809 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:06:12" (1/1) ... [2021-11-23 17:06:12,903 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:06:12" (1/1) ... [2021-11-23 17:06:13,112 INFO L137 Inliner]: procedures = 36, calls = 20, calls flagged for inlining = 15, calls inlined = 15, statements flattened = 4956 [2021-11-23 17:06:13,113 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:06:13,114 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:06:13,115 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:06:13,115 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:06:13,124 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:06:12" (1/1) ... [2021-11-23 17:06:13,124 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:06:12" (1/1) ... [2021-11-23 17:06:13,179 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:06:12" (1/1) ... [2021-11-23 17:06:13,180 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:06:12" (1/1) ... [2021-11-23 17:06:13,390 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:06:12" (1/1) ... [2021-11-23 17:06:13,449 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:06:12" (1/1) ... [2021-11-23 17:06:13,473 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:06:12" (1/1) ... [2021-11-23 17:06:13,515 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:06:13,517 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:06:13,517 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:06:13,517 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:06:13,518 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:06:12" (1/1) ... [2021-11-23 17:06:13,529 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:06:13,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:06:13,559 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:06:13,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:06:13,706 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:06:13,706 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:06:13,706 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:06:13,707 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:06:13,943 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:06:13,945 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:06:43,992 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:06:44,013 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:06:44,014 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 17:06:44,018 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:06:44 BoogieIcfgContainer [2021-11-23 17:06:44,018 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:06:44,021 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:06:44,021 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:06:44,024 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:06:44,024 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:06:10" (1/3) ... [2021-11-23 17:06:44,025 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e304157 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:06:44, skipping insertion in model container [2021-11-23 17:06:44,026 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:06:12" (2/3) ... [2021-11-23 17:06:44,026 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e304157 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:06:44, skipping insertion in model container [2021-11-23 17:06:44,026 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:06:44" (3/3) ... [2021-11-23 17:06:44,028 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.3_overflow.ufo.UNBOUNDED.pals+Problem12_label01.c [2021-11-23 17:06:44,034 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:06:44,034 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 17:06:44,092 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:06:44,099 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 17:06:44,100 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 17:06:44,135 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 17:06:44,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 17:06:44,143 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:44,144 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 17:06:44,145 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:44,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:44,151 INFO L85 PathProgramCache]: Analyzing trace with hash 975463267, now seen corresponding path program 1 times [2021-11-23 17:06:44,163 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:44,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1327378747] [2021-11-23 17:06:44,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:44,165 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:44,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:44,171 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:44,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:06:44,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:44,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 17:06:44,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:44,409 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 17:06:44,410 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:06:44,411 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:44,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1327378747] [2021-11-23 17:06:44,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1327378747] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:06:44,412 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:06:44,412 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:06:44,414 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367686811] [2021-11-23 17:06:44,415 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:06:44,420 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 17:06:44,421 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:44,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 17:06:44,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:06:44,454 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 17:06:44,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:44,620 INFO L93 Difference]: Finished difference Result 1732 states and 3290 transitions. [2021-11-23 17:06:44,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 17:06:44,625 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 17:06:44,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:44,649 INFO L225 Difference]: With dead ends: 1732 [2021-11-23 17:06:44,650 INFO L226 Difference]: Without dead ends: 812 [2021-11-23 17:06:44,666 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 17:06:44,670 INFO L933 BasicCegarLoop]: 1597 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, 1597 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 17:06:44,673 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 1597 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:06:44,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 812 states. [2021-11-23 17:06:44,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 812 to 812. [2021-11-23 17:06:44,769 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 17:06:44,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 812 states to 812 states and 1533 transitions. [2021-11-23 17:06:44,775 INFO L78 Accepts]: Start accepts. Automaton has 812 states and 1533 transitions. Word has length 26 [2021-11-23 17:06:44,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:44,776 INFO L470 AbstractCegarLoop]: Abstraction has 812 states and 1533 transitions. [2021-11-23 17:06:44,776 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 17:06:44,777 INFO L276 IsEmpty]: Start isEmpty. Operand 812 states and 1533 transitions. [2021-11-23 17:06:44,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 17:06:44,778 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:44,778 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 17:06:44,795 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2021-11-23 17:06:44,991 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:06:44,991 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:44,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:44,993 INFO L85 PathProgramCache]: Analyzing trace with hash 157814817, now seen corresponding path program 1 times [2021-11-23 17:06:44,993 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:44,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1312338525] [2021-11-23 17:06:44,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:44,994 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:44,995 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:44,998 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:45,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:06:45,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:45,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:06:45,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:45,265 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 17:06:45,265 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:06:45,265 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:45,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1312338525] [2021-11-23 17:06:45,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1312338525] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:06:45,268 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:06:45,268 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:06:45,268 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962144275] [2021-11-23 17:06:45,268 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:06:45,270 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:06:45,270 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:45,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:06:45,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:06:45,271 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 17:06:45,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:45,444 INFO L93 Difference]: Finished difference Result 852 states and 1593 transitions. [2021-11-23 17:06:45,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:06:45,444 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 17:06:45,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:45,451 INFO L225 Difference]: With dead ends: 852 [2021-11-23 17:06:45,451 INFO L226 Difference]: Without dead ends: 812 [2021-11-23 17:06:45,452 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 17:06:45,454 INFO L933 BasicCegarLoop]: 1531 mSDtfsCounter, 3 mSDsluCounter, 4574 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 6105 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:06:45,455 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 6105 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:06:45,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 812 states. [2021-11-23 17:06:45,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 812 to 812. [2021-11-23 17:06:45,480 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 17:06:45,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 812 states to 812 states and 1517 transitions. [2021-11-23 17:06:45,485 INFO L78 Accepts]: Start accepts. Automaton has 812 states and 1517 transitions. Word has length 26 [2021-11-23 17:06:45,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:45,486 INFO L470 AbstractCegarLoop]: Abstraction has 812 states and 1517 transitions. [2021-11-23 17:06:45,486 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 17:06:45,486 INFO L276 IsEmpty]: Start isEmpty. Operand 812 states and 1517 transitions. [2021-11-23 17:06:45,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 17:06:45,488 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:45,488 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:06:45,506 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:45,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:06:45,705 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:45,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:45,706 INFO L85 PathProgramCache]: Analyzing trace with hash -1324654887, now seen corresponding path program 1 times [2021-11-23 17:06:45,707 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:45,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1427111236] [2021-11-23 17:06:45,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:45,708 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:45,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:45,711 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:45,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:06:45,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:45,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:06:45,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:46,028 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 17:06:46,029 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:06:46,030 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:46,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1427111236] [2021-11-23 17:06:46,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1427111236] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:06:46,036 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:06:46,037 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:06:46,037 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554482080] [2021-11-23 17:06:46,038 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:06:46,038 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:06:46,039 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:46,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:06:46,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:06:46,040 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 17:06:46,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:46,092 INFO L93 Difference]: Finished difference Result 878 states and 1619 transitions. [2021-11-23 17:06:46,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:06:46,093 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 17:06:46,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:46,099 INFO L225 Difference]: With dead ends: 878 [2021-11-23 17:06:46,099 INFO L226 Difference]: Without dead ends: 842 [2021-11-23 17:06:46,100 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 17:06:46,103 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 17:06:46,105 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 17:06:46,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 842 states. [2021-11-23 17:06:46,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 842 to 840. [2021-11-23 17:06:46,134 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 17:06:46,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 840 states to 840 states and 1561 transitions. [2021-11-23 17:06:46,139 INFO L78 Accepts]: Start accepts. Automaton has 840 states and 1561 transitions. Word has length 41 [2021-11-23 17:06:46,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:46,140 INFO L470 AbstractCegarLoop]: Abstraction has 840 states and 1561 transitions. [2021-11-23 17:06:46,140 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 17:06:46,140 INFO L276 IsEmpty]: Start isEmpty. Operand 840 states and 1561 transitions. [2021-11-23 17:06:46,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 17:06:46,144 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:46,144 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 17:06:46,160 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:46,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:06:46,357 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:46,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:46,358 INFO L85 PathProgramCache]: Analyzing trace with hash 1376027727, now seen corresponding path program 1 times [2021-11-23 17:06:46,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:46,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1212795712] [2021-11-23 17:06:46,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:46,359 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:46,359 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:46,360 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:46,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:06:46,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:46,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:06:46,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:47,109 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 17:06:47,109 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:06:47,110 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:47,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1212795712] [2021-11-23 17:06:47,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1212795712] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:06:47,110 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:06:47,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:06:47,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746084286] [2021-11-23 17:06:47,111 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:06:47,112 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:06:47,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:47,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:06:47,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:06:47,113 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 17:06:47,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:47,307 INFO L93 Difference]: Finished difference Result 1096 states and 1961 transitions. [2021-11-23 17:06:47,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:06:47,308 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 17:06:47,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:47,315 INFO L225 Difference]: With dead ends: 1096 [2021-11-23 17:06:47,316 INFO L226 Difference]: Without dead ends: 1032 [2021-11-23 17:06:47,317 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:06:47,318 INFO L933 BasicCegarLoop]: 1511 mSDtfsCounter, 1614 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1614 SdHoareTripleChecker+Valid, 1682 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:06:47,321 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1614 Valid, 1682 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:06:47,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1032 states. [2021-11-23 17:06:47,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1032 to 964. [2021-11-23 17:06:47,358 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 17:06:47,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 964 states to 964 states and 1753 transitions. [2021-11-23 17:06:47,364 INFO L78 Accepts]: Start accepts. Automaton has 964 states and 1753 transitions. Word has length 41 [2021-11-23 17:06:47,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:47,365 INFO L470 AbstractCegarLoop]: Abstraction has 964 states and 1753 transitions. [2021-11-23 17:06:47,366 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 17:06:47,367 INFO L276 IsEmpty]: Start isEmpty. Operand 964 states and 1753 transitions. [2021-11-23 17:06:47,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 17:06:47,374 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:47,374 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 17:06:47,392 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:47,588 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:06:47,588 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:47,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:47,589 INFO L85 PathProgramCache]: Analyzing trace with hash -1902982177, now seen corresponding path program 1 times [2021-11-23 17:06:47,589 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:47,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1605202141] [2021-11-23 17:06:47,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:47,590 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:47,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:47,594 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:47,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:06:47,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:47,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:06:47,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:47,866 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 17:06:47,866 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:06:47,866 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:47,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1605202141] [2021-11-23 17:06:47,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1605202141] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:06:47,867 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:06:47,867 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:06:47,867 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205670069] [2021-11-23 17:06:47,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:06:47,868 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:06:47,868 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:47,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:06:47,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:06:47,869 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 17:06:47,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:47,981 INFO L93 Difference]: Finished difference Result 1242 states and 2182 transitions. [2021-11-23 17:06:47,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:06:47,982 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 17:06:47,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:47,989 INFO L225 Difference]: With dead ends: 1242 [2021-11-23 17:06:47,989 INFO L226 Difference]: Without dead ends: 1054 [2021-11-23 17:06:47,990 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 17:06:47,991 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 17:06:47,991 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 17:06:47,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1054 states. [2021-11-23 17:06:48,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1054 to 1052. [2021-11-23 17:06:48,024 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 17:06:48,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1052 states to 1052 states and 1884 transitions. [2021-11-23 17:06:48,030 INFO L78 Accepts]: Start accepts. Automaton has 1052 states and 1884 transitions. Word has length 43 [2021-11-23 17:06:48,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:48,030 INFO L470 AbstractCegarLoop]: Abstraction has 1052 states and 1884 transitions. [2021-11-23 17:06:48,030 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 17:06:48,030 INFO L276 IsEmpty]: Start isEmpty. Operand 1052 states and 1884 transitions. [2021-11-23 17:06:48,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 17:06:48,031 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:48,031 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 17:06:48,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:48,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:06:48,241 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:48,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:48,242 INFO L85 PathProgramCache]: Analyzing trace with hash -47574589, now seen corresponding path program 1 times [2021-11-23 17:06:48,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:48,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1391435857] [2021-11-23 17:06:48,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:48,243 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:48,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:48,244 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:48,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:06:48,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:48,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:06:48,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:48,453 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 17:06:48,453 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:06:48,453 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:48,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1391435857] [2021-11-23 17:06:48,454 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1391435857] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:06:48,454 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:06:48,454 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:06:48,454 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938075911] [2021-11-23 17:06:48,454 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:06:48,455 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:06:48,455 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:48,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:06:48,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:06:48,456 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 17:06:48,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:48,506 INFO L93 Difference]: Finished difference Result 1546 states and 2636 transitions. [2021-11-23 17:06:48,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:06:48,507 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 17:06:48,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:48,516 INFO L225 Difference]: With dead ends: 1546 [2021-11-23 17:06:48,516 INFO L226 Difference]: Without dead ends: 1272 [2021-11-23 17:06:48,517 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 17:06:48,518 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 17:06:48,518 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 17:06:48,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1272 states. [2021-11-23 17:06:48,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1272 to 1270. [2021-11-23 17:06:48,557 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 17:06:48,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1270 states to 1270 states and 2205 transitions. [2021-11-23 17:06:48,564 INFO L78 Accepts]: Start accepts. Automaton has 1270 states and 2205 transitions. Word has length 43 [2021-11-23 17:06:48,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:48,564 INFO L470 AbstractCegarLoop]: Abstraction has 1270 states and 2205 transitions. [2021-11-23 17:06:48,564 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 17:06:48,565 INFO L276 IsEmpty]: Start isEmpty. Operand 1270 states and 2205 transitions. [2021-11-23 17:06:48,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 17:06:48,565 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:48,565 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 17:06:48,581 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:48,778 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:06:48,779 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:48,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:48,779 INFO L85 PathProgramCache]: Analyzing trace with hash 1199933027, now seen corresponding path program 1 times [2021-11-23 17:06:48,780 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:48,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1711473686] [2021-11-23 17:06:48,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:48,780 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:48,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:48,782 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:48,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:06:48,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:48,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:06:48,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:49,015 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 17:06:49,015 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:06:49,016 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:49,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1711473686] [2021-11-23 17:06:49,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1711473686] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:06:49,016 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:06:49,016 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:06:49,016 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600017257] [2021-11-23 17:06:49,017 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:06:49,017 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:06:49,017 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:49,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:06:49,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:06:49,018 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 17:06:49,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:49,090 INFO L93 Difference]: Finished difference Result 2146 states and 3509 transitions. [2021-11-23 17:06:49,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:06:49,091 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 17:06:49,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:49,105 INFO L225 Difference]: With dead ends: 2146 [2021-11-23 17:06:49,106 INFO L226 Difference]: Without dead ends: 1654 [2021-11-23 17:06:49,109 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 17:06:49,110 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 17:06:49,111 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 17:06:49,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1654 states. [2021-11-23 17:06:49,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1654 to 1652. [2021-11-23 17:06:49,178 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 17:06:49,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1652 states to 1652 states and 2748 transitions. [2021-11-23 17:06:49,188 INFO L78 Accepts]: Start accepts. Automaton has 1652 states and 2748 transitions. Word has length 43 [2021-11-23 17:06:49,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:49,189 INFO L470 AbstractCegarLoop]: Abstraction has 1652 states and 2748 transitions. [2021-11-23 17:06:49,189 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 17:06:49,189 INFO L276 IsEmpty]: Start isEmpty. Operand 1652 states and 2748 transitions. [2021-11-23 17:06:49,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 17:06:49,190 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:49,190 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 17:06:49,209 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:49,403 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:06:49,404 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:49,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:49,404 INFO L85 PathProgramCache]: Analyzing trace with hash -1511296967, now seen corresponding path program 1 times [2021-11-23 17:06:49,405 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:49,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [743067057] [2021-11-23 17:06:49,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:49,405 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:49,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:49,406 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:49,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:06:49,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:49,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:06:49,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:49,604 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 17:06:49,604 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:06:49,604 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:49,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [743067057] [2021-11-23 17:06:49,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [743067057] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:06:49,605 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:06:49,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:06:49,605 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767635690] [2021-11-23 17:06:49,605 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:06:49,606 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:06:49,606 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:49,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:06:49,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:06:49,607 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 17:06:49,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:49,801 INFO L93 Difference]: Finished difference Result 2498 states and 3940 transitions. [2021-11-23 17:06:49,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:06:49,802 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 17:06:49,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:49,817 INFO L225 Difference]: With dead ends: 2498 [2021-11-23 17:06:49,817 INFO L226 Difference]: Without dead ends: 2496 [2021-11-23 17:06:49,818 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 17:06:49,819 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 17:06:49,819 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 17:06:49,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2496 states. [2021-11-23 17:06:49,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2496 to 1736. [2021-11-23 17:06:49,910 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 17:06:49,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1736 states to 1736 states and 2828 transitions. [2021-11-23 17:06:49,918 INFO L78 Accepts]: Start accepts. Automaton has 1736 states and 2828 transitions. Word has length 44 [2021-11-23 17:06:49,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:49,918 INFO L470 AbstractCegarLoop]: Abstraction has 1736 states and 2828 transitions. [2021-11-23 17:06:49,918 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 17:06:49,919 INFO L276 IsEmpty]: Start isEmpty. Operand 1736 states and 2828 transitions. [2021-11-23 17:06:49,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 17:06:49,919 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:49,919 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 17:06:49,936 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Ended with exit code 0 [2021-11-23 17:06:50,132 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:06:50,132 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:50,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:50,133 INFO L85 PathProgramCache]: Analyzing trace with hash -105607243, now seen corresponding path program 1 times [2021-11-23 17:06:50,134 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:50,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1376516965] [2021-11-23 17:06:50,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:50,134 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:50,134 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:50,135 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:50,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:06:50,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:50,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:06:50,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:50,435 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 17:06:50,435 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:06:50,436 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:50,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1376516965] [2021-11-23 17:06:50,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1376516965] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:06:50,436 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:06:50,436 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:06:50,436 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204251035] [2021-11-23 17:06:50,436 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:06:50,436 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:06:50,437 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:50,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:06:50,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:06:50,437 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 17:07:27,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:27,678 INFO L93 Difference]: Finished difference Result 3240 states and 5701 transitions. [2021-11-23 17:07:27,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:07:27,679 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 17:07:27,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:27,694 INFO L225 Difference]: With dead ends: 3240 [2021-11-23 17:07:27,694 INFO L226 Difference]: Without dead ends: 2487 [2021-11-23 17:07:27,696 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 17:07:27,697 INFO L933 BasicCegarLoop]: 295 mSDtfsCounter, 809 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2464 mSolverCounterSat, 512 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 31.0s 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, 37.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:07:27,697 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [809 Valid, 302 Invalid, 2976 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [512 Valid, 2464 Invalid, 0 Unknown, 0 Unchecked, 37.1s Time] [2021-11-23 17:07:27,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2487 states. [2021-11-23 17:07:27,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2487 to 2487. [2021-11-23 17:07:27,789 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 17:07:27,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2487 states to 2487 states and 4059 transitions. [2021-11-23 17:07:27,796 INFO L78 Accepts]: Start accepts. Automaton has 2487 states and 4059 transitions. Word has length 48 [2021-11-23 17:07:27,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:27,797 INFO L470 AbstractCegarLoop]: Abstraction has 2487 states and 4059 transitions. [2021-11-23 17:07:27,797 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 17:07:27,797 INFO L276 IsEmpty]: Start isEmpty. Operand 2487 states and 4059 transitions. [2021-11-23 17:07:27,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:07:27,798 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:27,799 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 17:07:27,818 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:28,011 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:07:28,011 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:28,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:28,012 INFO L85 PathProgramCache]: Analyzing trace with hash -213997176, now seen corresponding path program 1 times [2021-11-23 17:07:28,012 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:28,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1189125989] [2021-11-23 17:07:28,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:28,013 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:28,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:28,014 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:28,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:07:28,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:28,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:07:28,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:29,345 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 17:07:29,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:30,266 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 17:07:30,266 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:30,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1189125989] [2021-11-23 17:07:30,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1189125989] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:30,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1506508136] [2021-11-23 17:07:30,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:30,267 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:07:30,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:07:30,271 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:07:30,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-11-23 17:07:30,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:30,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:07:30,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:30,575 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 17:07:30,575 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:07:30,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1506508136] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:07:30,576 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:07:30,576 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 17:07:30,576 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531783296] [2021-11-23 17:07:30,576 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:07:30,576 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:07:30,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:30,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:07:30,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:07:30,577 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 17:07:30,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:30,684 INFO L93 Difference]: Finished difference Result 3447 states and 5425 transitions. [2021-11-23 17:07:30,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:07:30,684 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 17:07:30,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:30,699 INFO L225 Difference]: With dead ends: 3447 [2021-11-23 17:07:30,700 INFO L226 Difference]: Without dead ends: 2489 [2021-11-23 17:07:30,702 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 17:07:30,703 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 17:07:30,704 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 17:07:30,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2489 states. [2021-11-23 17:07:30,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2489 to 2487. [2021-11-23 17:07:30,794 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 17:07:30,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2487 states to 2487 states and 4041 transitions. [2021-11-23 17:07:30,802 INFO L78 Accepts]: Start accepts. Automaton has 2487 states and 4041 transitions. Word has length 64 [2021-11-23 17:07:30,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:30,802 INFO L470 AbstractCegarLoop]: Abstraction has 2487 states and 4041 transitions. [2021-11-23 17:07:30,802 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 17:07:30,802 INFO L276 IsEmpty]: Start isEmpty. Operand 2487 states and 4041 transitions. [2021-11-23 17:07:30,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:07:30,803 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:30,804 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 17:07:30,816 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:31,032 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:31,218 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:07:31,218 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:31,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:31,219 INFO L85 PathProgramCache]: Analyzing trace with hash 1584307858, now seen corresponding path program 1 times [2021-11-23 17:07:31,219 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:31,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [688578374] [2021-11-23 17:07:31,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:31,220 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:31,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:31,221 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:31,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 17:07:31,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:31,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:07:31,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:32,371 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 17:07:32,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:33,263 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 17:07:33,264 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:33,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [688578374] [2021-11-23 17:07:33,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [688578374] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:33,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [821550653] [2021-11-23 17:07:33,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:33,264 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:07:33,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:07:33,269 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:07:33,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-23 17:07:33,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:33,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:07:33,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:34,448 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 17:07:34,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:35,096 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 17:07:35,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [821550653] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:35,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914222168] [2021-11-23 17:07:35,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:35,097 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:07:35,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:07:35,099 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:07:35,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 17:07:35,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:35,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:07:35,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:36,126 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 17:07:36,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:36,791 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 17:07:36,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1914222168] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:36,791 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:07:36,791 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:07:36,792 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572957583] [2021-11-23 17:07:36,792 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:07:36,793 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:07:36,793 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:36,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:07:36,794 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:07:36,794 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 17:07:37,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:37,189 INFO L93 Difference]: Finished difference Result 3184 states and 5031 transitions. [2021-11-23 17:07:37,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 17:07:37,190 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 17:07:37,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:37,205 INFO L225 Difference]: With dead ends: 3184 [2021-11-23 17:07:37,205 INFO L226 Difference]: Without dead ends: 2510 [2021-11-23 17:07:37,207 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 364 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:07:37,208 INFO L933 BasicCegarLoop]: 1502 mSDtfsCounter, 7273 mSDsluCounter, 10530 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7273 SdHoareTripleChecker+Valid, 12032 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 50 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:07:37,208 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7273 Valid, 12032 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 39 Invalid, 0 Unknown, 50 Unchecked, 0.1s Time] [2021-11-23 17:07:37,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2510 states. [2021-11-23 17:07:37,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2510 to 2509. [2021-11-23 17:07:37,302 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 17:07:37,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2509 states to 2509 states and 4067 transitions. [2021-11-23 17:07:37,310 INFO L78 Accepts]: Start accepts. Automaton has 2509 states and 4067 transitions. Word has length 64 [2021-11-23 17:07:37,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:37,310 INFO L470 AbstractCegarLoop]: Abstraction has 2509 states and 4067 transitions. [2021-11-23 17:07:37,310 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 17:07:37,310 INFO L276 IsEmpty]: Start isEmpty. Operand 2509 states and 4067 transitions. [2021-11-23 17:07:37,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:07:37,312 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:37,312 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 17:07:37,352 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:37,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:37,757 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:37,936 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:07:37,936 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:37,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:37,937 INFO L85 PathProgramCache]: Analyzing trace with hash -2129817016, now seen corresponding path program 1 times [2021-11-23 17:07:37,937 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:37,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2110212040] [2021-11-23 17:07:37,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:37,938 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:37,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:37,938 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:37,941 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 17:07:38,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:38,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:07:38,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:39,508 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 17:07:39,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:40,041 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 17:07:40,041 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:40,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2110212040] [2021-11-23 17:07:40,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2110212040] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:40,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [155430508] [2021-11-23 17:07:40,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:40,042 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:07:40,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:07:40,045 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:07:40,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-23 17:07:40,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:40,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:07:40,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:40,284 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 17:07:40,285 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:07:40,285 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [155430508] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:07:40,285 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:07:40,285 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 17:07:40,285 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042348709] [2021-11-23 17:07:40,285 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:07:40,286 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:07:40,286 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:40,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:07:40,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:07:40,286 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 17:07:40,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:40,367 INFO L93 Difference]: Finished difference Result 2991 states and 4742 transitions. [2021-11-23 17:07:40,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:07:40,367 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 17:07:40,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:40,379 INFO L225 Difference]: With dead ends: 2991 [2021-11-23 17:07:40,379 INFO L226 Difference]: Without dead ends: 2033 [2021-11-23 17:07:40,381 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 17:07:40,383 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 17:07:40,383 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 17:07:40,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2033 states. [2021-11-23 17:07:40,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2033 to 2031. [2021-11-23 17:07:40,443 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 17:07:40,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2031 states to 2031 states and 3385 transitions. [2021-11-23 17:07:40,449 INFO L78 Accepts]: Start accepts. Automaton has 2031 states and 3385 transitions. Word has length 64 [2021-11-23 17:07:40,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:40,449 INFO L470 AbstractCegarLoop]: Abstraction has 2031 states and 3385 transitions. [2021-11-23 17:07:40,449 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 17:07:40,449 INFO L276 IsEmpty]: Start isEmpty. Operand 2031 states and 3385 transitions. [2021-11-23 17:07:40,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:07:40,450 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:40,451 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 17:07:40,460 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:40,670 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:40,862 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:07:40,862 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:40,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:40,862 INFO L85 PathProgramCache]: Analyzing trace with hash 947164882, now seen corresponding path program 1 times [2021-11-23 17:07:40,863 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:40,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [118874188] [2021-11-23 17:07:40,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:40,863 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:40,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:40,864 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:40,866 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 17:07:40,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:40,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:07:40,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:42,482 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 17:07:42,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:42,993 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 17:07:42,993 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:42,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [118874188] [2021-11-23 17:07:42,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [118874188] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:42,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1999843241] [2021-11-23 17:07:42,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:42,994 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:07:42,994 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:07:43,003 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:07:43,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-23 17:07:43,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:43,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:07:43,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:44,318 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 17:07:44,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:44,651 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 17:07:44,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1999843241] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:44,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1955343580] [2021-11-23 17:07:44,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:44,651 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:07:44,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:07:44,653 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:07:44,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 17:07:44,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:44,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:07:44,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:45,913 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 17:07:45,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:46,244 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 17:07:46,244 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1955343580] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:46,244 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:07:46,244 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:07:46,245 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893321058] [2021-11-23 17:07:46,245 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:07:46,246 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:07:46,246 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:46,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:07:46,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:07:46,247 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 17:07:46,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:46,584 INFO L93 Difference]: Finished difference Result 2400 states and 3898 transitions. [2021-11-23 17:07:46,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:07:46,585 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 17:07:46,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:46,597 INFO L225 Difference]: With dead ends: 2400 [2021-11-23 17:07:46,597 INFO L226 Difference]: Without dead ends: 2062 [2021-11-23 17:07:46,599 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 365 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:07:46,600 INFO L933 BasicCegarLoop]: 1501 mSDtfsCounter, 5850 mSDsluCounter, 11978 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5850 SdHoareTripleChecker+Valid, 13479 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 57 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:07:46,600 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5850 Valid, 13479 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 30 Invalid, 0 Unknown, 57 Unchecked, 0.1s Time] [2021-11-23 17:07:46,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2062 states. [2021-11-23 17:07:46,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2062 to 2041. [2021-11-23 17:07:46,665 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 17:07:46,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2041 states to 2041 states and 3397 transitions. [2021-11-23 17:07:46,672 INFO L78 Accepts]: Start accepts. Automaton has 2041 states and 3397 transitions. Word has length 64 [2021-11-23 17:07:46,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:46,673 INFO L470 AbstractCegarLoop]: Abstraction has 2041 states and 3397 transitions. [2021-11-23 17:07:46,673 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 17:07:46,673 INFO L276 IsEmpty]: Start isEmpty. Operand 2041 states and 3397 transitions. [2021-11-23 17:07:46,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:07:46,681 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:46,681 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 17:07:46,685 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:46,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:47,109 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Ended with exit code 0 [2021-11-23 17:07:47,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:07:47,297 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:47,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:47,298 INFO L85 PathProgramCache]: Analyzing trace with hash -1514914168, now seen corresponding path program 1 times [2021-11-23 17:07:47,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:47,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [256338525] [2021-11-23 17:07:47,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:47,299 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:47,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:47,299 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:47,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 17:07:47,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:47,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:07:47,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:47,505 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 17:07:47,505 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:07:47,505 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:47,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [256338525] [2021-11-23 17:07:47,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [256338525] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:07:47,505 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:07:47,506 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:07:47,506 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609862670] [2021-11-23 17:07:47,506 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:07:47,506 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:07:47,507 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:47,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:07:47,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:07:47,508 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 17:07:47,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:47,561 INFO L93 Difference]: Finished difference Result 2233 states and 3659 transitions. [2021-11-23 17:07:47,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:07:47,563 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 17:07:47,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:47,574 INFO L225 Difference]: With dead ends: 2233 [2021-11-23 17:07:47,575 INFO L226 Difference]: Without dead ends: 1753 [2021-11-23 17:07:47,576 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 17:07:47,577 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 17:07:47,577 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 17:07:47,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1753 states. [2021-11-23 17:07:47,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1753 to 1745. [2021-11-23 17:07:47,626 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 17:07:47,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1745 states to 1745 states and 2982 transitions. [2021-11-23 17:07:47,632 INFO L78 Accepts]: Start accepts. Automaton has 1745 states and 2982 transitions. Word has length 64 [2021-11-23 17:07:47,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:47,633 INFO L470 AbstractCegarLoop]: Abstraction has 1745 states and 2982 transitions. [2021-11-23 17:07:47,633 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 17:07:47,633 INFO L276 IsEmpty]: Start isEmpty. Operand 1745 states and 2982 transitions. [2021-11-23 17:07:47,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:07:47,634 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:47,635 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 17:07:47,657 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:47,853 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:07:47,854 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:47,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:47,854 INFO L85 PathProgramCache]: Analyzing trace with hash -2009059564, now seen corresponding path program 1 times [2021-11-23 17:07:47,855 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:47,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [991792836] [2021-11-23 17:07:47,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:47,855 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:47,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:47,857 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:47,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:07:47,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:47,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:07:47,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:48,417 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 17:07:48,417 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:07:48,418 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:48,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [991792836] [2021-11-23 17:07:48,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [991792836] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:07:48,418 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:07:48,418 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:07:48,418 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169904657] [2021-11-23 17:07:48,418 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:07:48,419 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:07:48,419 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:48,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:07:48,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:07:48,420 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 17:07:48,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:48,511 INFO L93 Difference]: Finished difference Result 1921 states and 3223 transitions. [2021-11-23 17:07:48,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:07:48,512 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 17:07:48,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:48,521 INFO L225 Difference]: With dead ends: 1921 [2021-11-23 17:07:48,521 INFO L226 Difference]: Without dead ends: 1745 [2021-11-23 17:07:48,523 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 17:07:48,523 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 17:07:48,524 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 17:07:48,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1745 states. [2021-11-23 17:07:48,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1745 to 1745. [2021-11-23 17:07:48,570 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 17:07:48,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1745 states to 1745 states and 2981 transitions. [2021-11-23 17:07:48,576 INFO L78 Accepts]: Start accepts. Automaton has 1745 states and 2981 transitions. Word has length 64 [2021-11-23 17:07:48,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:48,576 INFO L470 AbstractCegarLoop]: Abstraction has 1745 states and 2981 transitions. [2021-11-23 17:07:48,576 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 17:07:48,577 INFO L276 IsEmpty]: Start isEmpty. Operand 1745 states and 2981 transitions. [2021-11-23 17:07:48,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:07:48,577 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:48,578 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 17:07:48,595 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:48,791 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:07:48,791 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:48,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:48,792 INFO L85 PathProgramCache]: Analyzing trace with hash 740302356, now seen corresponding path program 1 times [2021-11-23 17:07:48,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:48,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [462174660] [2021-11-23 17:07:48,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:48,793 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:48,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:48,793 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:48,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 17:07:48,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:48,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:07:48,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:49,349 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 17:07:49,349 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:07:49,349 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:49,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [462174660] [2021-11-23 17:07:49,349 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [462174660] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:07:49,349 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:07:49,350 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:07:49,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163391321] [2021-11-23 17:07:49,350 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:07:49,350 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:07:49,350 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:49,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:07:49,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:07:49,351 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 17:07:49,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:49,456 INFO L93 Difference]: Finished difference Result 1925 states and 3227 transitions. [2021-11-23 17:07:49,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:07:49,456 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 17:07:49,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:49,481 INFO L225 Difference]: With dead ends: 1925 [2021-11-23 17:07:49,482 INFO L226 Difference]: Without dead ends: 1745 [2021-11-23 17:07:49,483 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 17:07:49,484 INFO L933 BasicCegarLoop]: 1509 mSDtfsCounter, 1458 mSDsluCounter, 3014 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1458 SdHoareTripleChecker+Valid, 4523 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 27 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:07:49,484 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1458 Valid, 4523 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 27 Unchecked, 0.0s Time] [2021-11-23 17:07:49,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1745 states. [2021-11-23 17:07:49,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1745 to 1745. [2021-11-23 17:07:49,543 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 17:07:49,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1745 states to 1745 states and 2980 transitions. [2021-11-23 17:07:49,549 INFO L78 Accepts]: Start accepts. Automaton has 1745 states and 2980 transitions. Word has length 64 [2021-11-23 17:07:49,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:49,550 INFO L470 AbstractCegarLoop]: Abstraction has 1745 states and 2980 transitions. [2021-11-23 17:07:49,551 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 17:07:49,551 INFO L276 IsEmpty]: Start isEmpty. Operand 1745 states and 2980 transitions. [2021-11-23 17:07:49,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:07:49,552 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:49,552 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 17:07:49,567 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:49,766 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:07:49,767 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:49,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:49,767 INFO L85 PathProgramCache]: Analyzing trace with hash -261059308, now seen corresponding path program 1 times [2021-11-23 17:07:49,767 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:49,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1173892588] [2021-11-23 17:07:49,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:49,768 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:49,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:49,768 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:49,769 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:07:49,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:49,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:07:49,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:50,365 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 17:07:50,365 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:07:50,365 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:50,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1173892588] [2021-11-23 17:07:50,366 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1173892588] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:07:50,366 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:07:50,366 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:07:50,366 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776093860] [2021-11-23 17:07:50,366 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:07:50,367 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:07:50,367 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:50,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:07:50,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:07:50,367 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 17:07:50,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:50,494 INFO L93 Difference]: Finished difference Result 1915 states and 3215 transitions. [2021-11-23 17:07:50,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:07:50,494 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 17:07:50,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:50,500 INFO L225 Difference]: With dead ends: 1915 [2021-11-23 17:07:50,500 INFO L226 Difference]: Without dead ends: 1731 [2021-11-23 17:07:50,501 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 17:07:50,503 INFO L933 BasicCegarLoop]: 1512 mSDtfsCounter, 2906 mSDsluCounter, 1499 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2906 SdHoareTripleChecker+Valid, 3011 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 8 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:07:50,504 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2906 Valid, 3011 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 8 Unchecked, 0.1s Time] [2021-11-23 17:07:50,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1731 states. [2021-11-23 17:07:50,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1731 to 1731. [2021-11-23 17:07:50,553 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 17:07:50,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1731 states to 1731 states and 2963 transitions. [2021-11-23 17:07:50,558 INFO L78 Accepts]: Start accepts. Automaton has 1731 states and 2963 transitions. Word has length 64 [2021-11-23 17:07:50,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:50,558 INFO L470 AbstractCegarLoop]: Abstraction has 1731 states and 2963 transitions. [2021-11-23 17:07:50,559 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 17:07:50,559 INFO L276 IsEmpty]: Start isEmpty. Operand 1731 states and 2963 transitions. [2021-11-23 17:07:50,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 17:07:50,560 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:50,560 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 17:07:50,580 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:50,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:07:50,773 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:50,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:50,774 INFO L85 PathProgramCache]: Analyzing trace with hash -2023735102, now seen corresponding path program 1 times [2021-11-23 17:07:50,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:50,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [403079114] [2021-11-23 17:07:50,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:50,774 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:50,774 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:50,775 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:50,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 17:07:50,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:50,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:07:50,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:52,273 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:52,273 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:52,960 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 17:07:52,960 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:52,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [403079114] [2021-11-23 17:07:52,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [403079114] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:52,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [7515053] [2021-11-23 17:07:52,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:52,961 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:07:52,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:07:52,965 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:07:52,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-23 17:07:53,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:53,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:07:53,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:54,403 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 17:07:54,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:54,871 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 17:07:54,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [7515053] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:54,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1517290963] [2021-11-23 17:07:54,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:54,872 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:07:54,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:07:54,873 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:07:54,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-23 17:07:54,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:54,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:07:54,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:56,196 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 17:07:56,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:56,656 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 17:07:56,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1517290963] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:56,656 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:07:56,656 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:07:56,657 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62246008] [2021-11-23 17:07:56,657 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:07:56,657 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:07:56,657 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:56,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:07:56,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:07:56,658 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 17:07:57,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:57,110 INFO L93 Difference]: Finished difference Result 2095 states and 3456 transitions. [2021-11-23 17:07:57,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:07:57,110 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 17:07:57,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:57,116 INFO L225 Difference]: With dead ends: 2095 [2021-11-23 17:07:57,116 INFO L226 Difference]: Without dead ends: 1925 [2021-11-23 17:07:57,118 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 370 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:07:57,119 INFO L933 BasicCegarLoop]: 1511 mSDtfsCounter, 5912 mSDsluCounter, 10576 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5912 SdHoareTripleChecker+Valid, 12087 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 84 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:07:57,119 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5912 Valid, 12087 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 89 Invalid, 0 Unknown, 84 Unchecked, 0.1s Time] [2021-11-23 17:07:57,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1925 states. [2021-11-23 17:07:57,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1925 to 1830. [2021-11-23 17:07:57,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1830 states, 1828 states have (on average 1.6947483588621444) internal successors, (3098), 1829 states have internal predecessors, (3098), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:07:57,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1830 states to 1830 states and 3098 transitions. [2021-11-23 17:07:57,175 INFO L78 Accepts]: Start accepts. Automaton has 1830 states and 3098 transitions. Word has length 65 [2021-11-23 17:07:57,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:57,176 INFO L470 AbstractCegarLoop]: Abstraction has 1830 states and 3098 transitions. [2021-11-23 17:07:57,176 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 17:07:57,176 INFO L276 IsEmpty]: Start isEmpty. Operand 1830 states and 3098 transitions. [2021-11-23 17:07:57,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 17:07:57,181 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:57,181 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 17:07:57,189 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:57,424 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:57,618 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:57,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:07:57,805 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:57,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:57,806 INFO L85 PathProgramCache]: Analyzing trace with hash -94088951, now seen corresponding path program 1 times [2021-11-23 17:07:57,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:57,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1578144887] [2021-11-23 17:07:57,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:57,806 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:57,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:57,808 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:57,843 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 17:07:57,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:57,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:07:57,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:58,512 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 17:07:58,512 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:07:58,513 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:58,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1578144887] [2021-11-23 17:07:58,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1578144887] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:07:58,513 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:07:58,513 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:07:58,513 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470090469] [2021-11-23 17:07:58,514 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:07:58,514 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:07:58,514 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:58,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:07:58,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:07:58,515 INFO L87 Difference]: Start difference. First operand 1830 states and 3098 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 17:07:58,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:58,684 INFO L93 Difference]: Finished difference Result 2194 states and 3597 transitions. [2021-11-23 17:07:58,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:07:58,686 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 17:07:58,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:58,691 INFO L225 Difference]: With dead ends: 2194 [2021-11-23 17:07:58,692 INFO L226 Difference]: Without dead ends: 1925 [2021-11-23 17:07:58,693 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 17:07:58,695 INFO L933 BasicCegarLoop]: 1569 mSDtfsCounter, 3060 mSDsluCounter, 1611 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3060 SdHoareTripleChecker+Valid, 3180 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:07:58,695 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3060 Valid, 3180 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:07:58,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1925 states. [2021-11-23 17:07:58,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1925 to 1830. [2021-11-23 17:07:58,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1830 states, 1828 states have (on average 1.6898249452954048) internal successors, (3089), 1829 states have internal predecessors, (3089), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:07:58,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1830 states to 1830 states and 3089 transitions. [2021-11-23 17:07:58,745 INFO L78 Accepts]: Start accepts. Automaton has 1830 states and 3089 transitions. Word has length 66 [2021-11-23 17:07:58,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:58,745 INFO L470 AbstractCegarLoop]: Abstraction has 1830 states and 3089 transitions. [2021-11-23 17:07:58,746 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 17:07:58,746 INFO L276 IsEmpty]: Start isEmpty. Operand 1830 states and 3089 transitions. [2021-11-23 17:07:58,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 17:07:58,747 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:58,747 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 17:07:58,764 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:58,960 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:07:58,960 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:58,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:58,961 INFO L85 PathProgramCache]: Analyzing trace with hash 1408270156, now seen corresponding path program 1 times [2021-11-23 17:07:58,961 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:58,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [805526006] [2021-11-23 17:07:58,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:58,961 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:58,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:58,962 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:58,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 17:07:59,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:59,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:07:59,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:59,527 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 17:07:59,527 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:07:59,527 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:59,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [805526006] [2021-11-23 17:07:59,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [805526006] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:07:59,527 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:07:59,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:07:59,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920968754] [2021-11-23 17:07:59,528 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:07:59,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:07:59,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:59,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:07:59,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:07:59,529 INFO L87 Difference]: Start difference. First operand 1830 states and 3089 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 17:07:59,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:59,650 INFO L93 Difference]: Finished difference Result 2105 states and 3471 transitions. [2021-11-23 17:07:59,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:07:59,651 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 17:07:59,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:59,654 INFO L225 Difference]: With dead ends: 2105 [2021-11-23 17:07:59,654 INFO L226 Difference]: Without dead ends: 2014 [2021-11-23 17:07:59,655 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 17:07:59,656 INFO L933 BasicCegarLoop]: 1575 mSDtfsCounter, 3058 mSDsluCounter, 1601 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3058 SdHoareTripleChecker+Valid, 3176 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:07:59,656 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3058 Valid, 3176 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:07:59,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2014 states. [2021-11-23 17:07:59,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2014 to 1919. [2021-11-23 17:07:59,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1919 states, 1917 states have (on average 1.6724047991653626) internal successors, (3206), 1918 states have internal predecessors, (3206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:07:59,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1919 states to 1919 states and 3206 transitions. [2021-11-23 17:07:59,734 INFO L78 Accepts]: Start accepts. Automaton has 1919 states and 3206 transitions. Word has length 66 [2021-11-23 17:07:59,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:59,734 INFO L470 AbstractCegarLoop]: Abstraction has 1919 states and 3206 transitions. [2021-11-23 17:07:59,734 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 17:07:59,735 INFO L276 IsEmpty]: Start isEmpty. Operand 1919 states and 3206 transitions. [2021-11-23 17:07:59,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 17:07:59,736 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:59,736 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 17:07:59,753 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:59,949 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:07:59,949 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:59,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:59,950 INFO L85 PathProgramCache]: Analyzing trace with hash 52806377, now seen corresponding path program 1 times [2021-11-23 17:07:59,950 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:59,950 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [209432273] [2021-11-23 17:07:59,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:59,951 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:59,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:59,952 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:59,955 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 17:08:00,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:00,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:08:00,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:00,499 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 17:08:00,499 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:08:00,499 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:00,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [209432273] [2021-11-23 17:08:00,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [209432273] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:08:00,499 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:08:00,500 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:08:00,500 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891496869] [2021-11-23 17:08:00,500 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:08:00,500 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:08:00,501 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:00,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:08:00,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:08:00,502 INFO L87 Difference]: Start difference. First operand 1919 states and 3206 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 17:08:00,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:00,642 INFO L93 Difference]: Finished difference Result 2194 states and 3588 transitions. [2021-11-23 17:08:00,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:08:00,642 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 17:08:00,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:00,646 INFO L225 Difference]: With dead ends: 2194 [2021-11-23 17:08:00,646 INFO L226 Difference]: Without dead ends: 2103 [2021-11-23 17:08:00,647 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 17:08:00,647 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 17:08:00,648 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 17:08:00,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2103 states. [2021-11-23 17:08:00,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2103 to 2008. [2021-11-23 17:08:00,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2008 states, 2006 states have (on average 1.656530408773679) internal successors, (3323), 2007 states have internal predecessors, (3323), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:00,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2008 states to 2008 states and 3323 transitions. [2021-11-23 17:08:00,688 INFO L78 Accepts]: Start accepts. Automaton has 2008 states and 3323 transitions. Word has length 66 [2021-11-23 17:08:00,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:00,689 INFO L470 AbstractCegarLoop]: Abstraction has 2008 states and 3323 transitions. [2021-11-23 17:08:00,689 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 17:08:00,689 INFO L276 IsEmpty]: Start isEmpty. Operand 2008 states and 3323 transitions. [2021-11-23 17:08:00,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 17:08:00,690 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:00,690 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 17:08:00,698 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:00,890 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:08:00,891 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:00,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:00,891 INFO L85 PathProgramCache]: Analyzing trace with hash -791645332, now seen corresponding path program 1 times [2021-11-23 17:08:00,891 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:00,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [702144648] [2021-11-23 17:08:00,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:00,892 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:00,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:00,892 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:00,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 17:08:00,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:00,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:08:00,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:04,543 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 17:08:04,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:06,948 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 17:08:06,949 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:06,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [702144648] [2021-11-23 17:08:06,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [702144648] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:06,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [684757492] [2021-11-23 17:08:06,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:06,949 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:06,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:08:06,950 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:08:06,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-23 17:08:07,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:07,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:08:07,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:09,568 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 17:08:09,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:10,432 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 17:08:10,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [684757492] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:10,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1273691798] [2021-11-23 17:08:10,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:10,432 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:08:10,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:08:10,433 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:08:10,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-23 17:08:10,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:10,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:08:10,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:14,792 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 17:08:14,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:16,267 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 17:08:16,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1273691798] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:16,268 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:08:16,268 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 21, 20, 20, 19] total 55 [2021-11-23 17:08:16,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222933075] [2021-11-23 17:08:16,269 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:08:16,269 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 17:08:16,270 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:16,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 17:08:16,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=344, Invalid=2626, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:08:16,271 INFO L87 Difference]: Start difference. First operand 2008 states and 3323 transitions. Second operand has 55 states, 55 states have (on average 3.272727272727273) internal successors, (180), 55 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:17,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:17,092 INFO L93 Difference]: Finished difference Result 2333 states and 3741 transitions. [2021-11-23 17:08:17,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:08:17,093 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.272727272727273) internal successors, (180), 55 states have internal predecessors, (180), 0 states have call successors, (0), 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 17:08:17,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:17,097 INFO L225 Difference]: With dead ends: 2333 [2021-11-23 17:08:17,097 INFO L226 Difference]: Without dead ends: 2153 [2021-11-23 17:08:17,100 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 345 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1303 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=420, Invalid=2886, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 17:08:17,100 INFO L933 BasicCegarLoop]: 1520 mSDtfsCounter, 7345 mSDsluCounter, 33180 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7345 SdHoareTripleChecker+Valid, 34700 SdHoareTripleChecker+Invalid, 458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 252 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:17,101 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7345 Valid, 34700 Invalid, 458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 194 Invalid, 0 Unknown, 252 Unchecked, 0.3s Time] [2021-11-23 17:08:17,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2153 states. [2021-11-23 17:08:17,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2153 to 2014. [2021-11-23 17:08:17,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2014 states, 2012 states have (on average 1.6550695825049702) internal successors, (3330), 2013 states have internal predecessors, (3330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:17,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2014 states to 2014 states and 3330 transitions. [2021-11-23 17:08:17,164 INFO L78 Accepts]: Start accepts. Automaton has 2014 states and 3330 transitions. Word has length 67 [2021-11-23 17:08:17,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:17,165 INFO L470 AbstractCegarLoop]: Abstraction has 2014 states and 3330 transitions. [2021-11-23 17:08:17,165 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.272727272727273) internal successors, (180), 55 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:17,165 INFO L276 IsEmpty]: Start isEmpty. Operand 2014 states and 3330 transitions. [2021-11-23 17:08:17,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 17:08:17,166 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:17,167 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 17:08:17,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:17,381 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (32)] Ended with exit code 0 [2021-11-23 17:08:17,602 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2021-11-23 17:08:17,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:08:17,781 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:17,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:17,781 INFO L85 PathProgramCache]: Analyzing trace with hash 138650479, now seen corresponding path program 1 times [2021-11-23 17:08:17,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:17,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [735773043] [2021-11-23 17:08:17,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:17,782 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:17,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:17,782 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:17,783 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-23 17:08:17,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:17,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:08:17,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:20,627 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 17:08:20,627 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:22,316 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 17:08:22,317 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:22,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [735773043] [2021-11-23 17:08:22,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [735773043] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:22,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [843157942] [2021-11-23 17:08:22,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:22,318 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:22,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:08:22,319 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:08:22,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-11-23 17:08:22,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:22,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:08:22,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:24,512 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 17:08:24,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:25,210 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 17:08:25,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [843157942] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:25,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [89344631] [2021-11-23 17:08:25,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:25,211 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:08:25,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:08:25,212 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:08:25,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-23 17:08:25,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:25,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:08:25,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:28,568 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 17:08:28,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:29,964 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 17:08:29,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [89344631] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:29,965 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:08:29,965 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 20, 18, 18, 18] total 55 [2021-11-23 17:08:29,965 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824628670] [2021-11-23 17:08:29,965 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:08:29,966 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 17:08:29,966 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:29,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 17:08:29,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=2600, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:08:29,969 INFO L87 Difference]: Start difference. First operand 2014 states and 3330 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 17:08:31,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:31,257 INFO L93 Difference]: Finished difference Result 2351 states and 3758 transitions. [2021-11-23 17:08:31,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 17:08:31,258 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 17:08:31,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:31,262 INFO L225 Difference]: With dead ends: 2351 [2021-11-23 17:08:31,262 INFO L226 Difference]: Without dead ends: 2167 [2021-11-23 17:08:31,265 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 344 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1399 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=453, Invalid=2853, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 17:08:31,266 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 13142 mSDsluCounter, 33046 mSDsCounter, 0 mSdLazyCounter, 306 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13142 SdHoareTripleChecker+Valid, 34567 SdHoareTripleChecker+Invalid, 575 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 249 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:31,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13142 Valid, 34567 Invalid, 575 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [20 Valid, 306 Invalid, 0 Unknown, 249 Unchecked, 0.6s Time] [2021-11-23 17:08:31,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2167 states. [2021-11-23 17:08:31,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2167 to 2010. [2021-11-23 17:08:31,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2010 states, 2008 states have (on average 1.6558764940239044) internal successors, (3325), 2009 states have internal predecessors, (3325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:31,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2010 states to 2010 states and 3325 transitions. [2021-11-23 17:08:31,334 INFO L78 Accepts]: Start accepts. Automaton has 2010 states and 3325 transitions. Word has length 67 [2021-11-23 17:08:31,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:31,335 INFO L470 AbstractCegarLoop]: Abstraction has 2010 states and 3325 transitions. [2021-11-23 17:08:31,335 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 17:08:31,335 INFO L276 IsEmpty]: Start isEmpty. Operand 2010 states and 3325 transitions. [2021-11-23 17:08:31,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:08:31,337 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:31,337 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 17:08:31,381 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:31,570 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Ended with exit code 0 [2021-11-23 17:08:31,762 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (35)] Ended with exit code 0 [2021-11-23 17:08:31,961 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:31,961 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:31,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:31,962 INFO L85 PathProgramCache]: Analyzing trace with hash -14785480, now seen corresponding path program 1 times [2021-11-23 17:08:31,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:31,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [385258658] [2021-11-23 17:08:31,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:31,962 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:31,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:31,963 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:31,965 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-23 17:08:32,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:32,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:08:32,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:32,378 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 17:08:32,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:32,632 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 17:08:32,633 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:32,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [385258658] [2021-11-23 17:08:32,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [385258658] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:32,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1490022642] [2021-11-23 17:08:32,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:32,633 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:32,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:08:32,634 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:08:32,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-23 17:08:32,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:32,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:08:32,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:33,042 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 17:08:33,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:33,277 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 17:08:33,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1490022642] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:33,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1129890829] [2021-11-23 17:08:33,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:33,278 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:08:33,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:08:33,279 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:08:33,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-23 17:08:33,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:33,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:08:33,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:33,732 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 17:08:33,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:34,171 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:34,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1129890829] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:34,171 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:08:34,172 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 5] total 7 [2021-11-23 17:08:34,172 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349895941] [2021-11-23 17:08:34,172 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:08:34,173 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:08:34,173 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:34,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:08:34,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:08:34,174 INFO L87 Difference]: Start difference. First operand 2010 states and 3325 transitions. Second operand has 7 states, 7 states have (on average 23.142857142857142) internal successors, (162), 7 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:34,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:34,321 INFO L93 Difference]: Finished difference Result 3333 states and 5042 transitions. [2021-11-23 17:08:34,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 17:08:34,322 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 23.142857142857142) internal successors, (162), 7 states have internal predecessors, (162), 0 states have call successors, (0), 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 17:08:34,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:34,329 INFO L225 Difference]: With dead ends: 3333 [2021-11-23 17:08:34,329 INFO L226 Difference]: Without dead ends: 2886 [2021-11-23 17:08:34,331 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 394 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:08:34,331 INFO L933 BasicCegarLoop]: 1536 mSDtfsCounter, 3068 mSDsluCounter, 1733 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3068 SdHoareTripleChecker+Valid, 3269 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 14 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:34,332 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3068 Valid, 3269 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 27 Invalid, 0 Unknown, 14 Unchecked, 0.1s Time] [2021-11-23 17:08:34,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2886 states. [2021-11-23 17:08:34,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2886 to 2762. [2021-11-23 17:08:34,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2762 states, 2760 states have (on average 1.5503623188405797) internal successors, (4279), 2761 states have internal predecessors, (4279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:34,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2762 states to 2762 states and 4279 transitions. [2021-11-23 17:08:34,452 INFO L78 Accepts]: Start accepts. Automaton has 2762 states and 4279 transitions. Word has length 68 [2021-11-23 17:08:34,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:34,452 INFO L470 AbstractCegarLoop]: Abstraction has 2762 states and 4279 transitions. [2021-11-23 17:08:34,453 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 23.142857142857142) internal successors, (162), 7 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:34,453 INFO L276 IsEmpty]: Start isEmpty. Operand 2762 states and 4279 transitions. [2021-11-23 17:08:34,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:08:34,454 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:34,454 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 17:08:34,457 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:34,680 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2021-11-23 17:08:34,866 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Ended with exit code 0 [2021-11-23 17:08:35,057 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:08:35,058 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:35,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:35,058 INFO L85 PathProgramCache]: Analyzing trace with hash -1574375839, now seen corresponding path program 1 times [2021-11-23 17:08:35,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:35,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [413541677] [2021-11-23 17:08:35,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:35,059 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:35,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:35,060 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:35,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-23 17:08:35,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:35,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:08:35,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:39,625 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 17:08:39,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:42,734 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 17:08:42,734 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:42,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [413541677] [2021-11-23 17:08:42,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [413541677] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:42,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [501034640] [2021-11-23 17:08:42,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:42,735 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:42,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:08:42,741 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:08:42,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-23 17:08:42,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:42,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:08:42,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:46,830 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 17:08:46,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:48,526 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 17:08:48,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [501034640] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:48,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [834946941] [2021-11-23 17:08:48,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:48,527 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:08:48,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:08:48,528 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:08:48,529 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-23 17:08:48,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:48,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:08:48,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:50,959 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 17:08:50,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:51,772 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 17:08:51,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [834946941] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:51,772 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:08:51,772 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18, 20, 19, 21, 18] total 51 [2021-11-23 17:08:51,773 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020063108] [2021-11-23 17:08:51,773 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:08:51,773 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 17:08:51,774 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:51,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 17:08:51,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=2290, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 17:08:51,775 INFO L87 Difference]: Start difference. First operand 2762 states and 4279 transitions. Second operand has 51 states, 51 states have (on average 3.3529411764705883) internal successors, (171), 51 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:52,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:52,793 INFO L93 Difference]: Finished difference Result 3276 states and 4935 transitions. [2021-11-23 17:08:52,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 17:08:52,793 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 3.3529411764705883) internal successors, (171), 51 states have internal predecessors, (171), 0 states have call successors, (0), 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 17:08:52,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:52,801 INFO L225 Difference]: With dead ends: 3276 [2021-11-23 17:08:52,801 INFO L226 Difference]: Without dead ends: 2816 [2021-11-23 17:08:52,803 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 353 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1020 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=304, Invalid=2452, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 17:08:52,804 INFO L933 BasicCegarLoop]: 1494 mSDtfsCounter, 11612 mSDsluCounter, 29880 mSDsCounter, 0 mSdLazyCounter, 233 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11612 SdHoareTripleChecker+Valid, 31374 SdHoareTripleChecker+Invalid, 439 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 193 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:52,810 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11612 Valid, 31374 Invalid, 439 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 233 Invalid, 0 Unknown, 193 Unchecked, 0.4s Time] [2021-11-23 17:08:52,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2816 states. [2021-11-23 17:08:52,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2816 to 2768. [2021-11-23 17:08:52,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2768 states, 2766 states have (on average 1.549530007230658) internal successors, (4286), 2767 states have internal predecessors, (4286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:52,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2768 states to 2768 states and 4286 transitions. [2021-11-23 17:08:52,930 INFO L78 Accepts]: Start accepts. Automaton has 2768 states and 4286 transitions. Word has length 68 [2021-11-23 17:08:52,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:52,931 INFO L470 AbstractCegarLoop]: Abstraction has 2768 states and 4286 transitions. [2021-11-23 17:08:52,931 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 3.3529411764705883) internal successors, (171), 51 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:08:52,931 INFO L276 IsEmpty]: Start isEmpty. Operand 2768 states and 4286 transitions. [2021-11-23 17:08:52,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:08:52,932 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:52,932 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 17:08:52,938 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (41)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:53,155 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2021-11-23 17:08:53,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:53,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:08:53,535 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:53,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:53,536 INFO L85 PathProgramCache]: Analyzing trace with hash 1310661252, now seen corresponding path program 1 times [2021-11-23 17:08:53,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:53,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1949327679] [2021-11-23 17:08:53,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:53,536 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:53,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:53,537 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:53,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-23 17:08:53,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:53,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:08:53,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:57,141 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 17:08:57,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:59,461 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 17:08:59,461 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:59,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1949327679] [2021-11-23 17:08:59,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1949327679] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:59,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [108418303] [2021-11-23 17:08:59,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:59,462 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:59,462 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:08:59,463 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:08:59,464 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-23 17:08:59,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:59,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:08:59,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:02,305 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 17:09:02,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:04,400 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 17:09:04,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [108418303] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:04,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [527708914] [2021-11-23 17:09:04,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:04,400 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:09:04,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:09:04,403 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:09:04,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-23 17:09:04,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:04,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:09:04,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:08,035 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 17:09:08,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:09,418 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 17:09:09,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [527708914] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:09,419 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:09:09,419 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 22, 20, 16, 15] total 72 [2021-11-23 17:09:09,419 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283121045] [2021-11-23 17:09:09,419 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:09:09,420 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-23 17:09:09,420 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:09,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-23 17:09:09,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=696, Invalid=4416, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 17:09:09,423 INFO L87 Difference]: Start difference. First operand 2768 states and 4286 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 17:09:11,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:09:11,134 INFO L93 Difference]: Finished difference Result 3818 states and 5583 transitions. [2021-11-23 17:09:11,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:09:11,134 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 17:09:11,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:09:11,137 INFO L225 Difference]: With dead ends: 3818 [2021-11-23 17:09:11,137 INFO L226 Difference]: Without dead ends: 3054 [2021-11-23 17:09:11,145 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 334 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2575 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=807, Invalid=4743, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 17:09:11,145 INFO L933 BasicCegarLoop]: 1528 mSDtfsCounter, 7437 mSDsluCounter, 31874 mSDsCounter, 0 mSdLazyCounter, 674 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7437 SdHoareTripleChecker+Valid, 33402 SdHoareTripleChecker+Invalid, 961 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 674 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 268 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:09:11,145 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7437 Valid, 33402 Invalid, 961 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 674 Invalid, 0 Unknown, 268 Unchecked, 1.1s Time] [2021-11-23 17:09:11,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3054 states. [2021-11-23 17:09:11,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3054 to 2656. [2021-11-23 17:09:11,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2656 states, 2654 states have (on average 1.5584024114544084) internal successors, (4136), 2655 states have internal predecessors, (4136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:11,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2656 states to 2656 states and 4136 transitions. [2021-11-23 17:09:11,249 INFO L78 Accepts]: Start accepts. Automaton has 2656 states and 4136 transitions. Word has length 68 [2021-11-23 17:09:11,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:09:11,249 INFO L470 AbstractCegarLoop]: Abstraction has 2656 states and 4136 transitions. [2021-11-23 17:09:11,250 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 17:09:11,250 INFO L276 IsEmpty]: Start isEmpty. Operand 2656 states and 4136 transitions. [2021-11-23 17:09:11,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 17:09:11,251 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:09:11,251 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 17:09:11,288 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:11,480 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:11,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (44)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:11,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:11,872 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:09:11,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:09:11,872 INFO L85 PathProgramCache]: Analyzing trace with hash 1846619806, now seen corresponding path program 1 times [2021-11-23 17:09:11,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:09:11,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2081210663] [2021-11-23 17:09:11,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:11,873 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:09:11,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:09:11,874 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:09:11,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-23 17:09:11,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:11,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:09:11,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:12,218 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 17:09:12,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:12,451 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 17:09:12,452 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:12,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2081210663] [2021-11-23 17:09:12,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2081210663] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:12,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1498102591] [2021-11-23 17:09:12,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:12,452 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:12,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:09:12,453 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:09:12,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (47)] Waiting until timeout for monitored process [2021-11-23 17:09:12,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:12,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:09:12,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:12,644 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 17:09:12,644 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:09:12,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1498102591] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:09:12,645 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:09:12,645 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 17:09:12,645 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399760251] [2021-11-23 17:09:12,645 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:09:12,646 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:09:12,646 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:12,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:09:12,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:09:12,647 INFO L87 Difference]: Start difference. First operand 2656 states and 4136 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 17:09:12,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:09:12,758 INFO L93 Difference]: Finished difference Result 3726 states and 5502 transitions. [2021-11-23 17:09:12,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:09:12,759 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 17:09:12,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:09:12,763 INFO L225 Difference]: With dead ends: 3726 [2021-11-23 17:09:12,763 INFO L226 Difference]: Without dead ends: 2685 [2021-11-23 17:09:12,765 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 17:09:12,767 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 17:09:12,767 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 17:09:12,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2685 states. [2021-11-23 17:09:12,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2685 to 2590. [2021-11-23 17:09:12,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2590 states, 2588 states have (on average 1.5649149922720247) internal successors, (4050), 2589 states have internal predecessors, (4050), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:12,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2590 states to 2590 states and 4050 transitions. [2021-11-23 17:09:12,909 INFO L78 Accepts]: Start accepts. Automaton has 2590 states and 4050 transitions. Word has length 69 [2021-11-23 17:09:12,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:09:12,909 INFO L470 AbstractCegarLoop]: Abstraction has 2590 states and 4050 transitions. [2021-11-23 17:09:12,909 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 17:09:12,909 INFO L276 IsEmpty]: Start isEmpty. Operand 2590 states and 4050 transitions. [2021-11-23 17:09:12,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 17:09:12,910 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:09:12,911 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 17:09:12,923 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:13,123 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (47)] Ended with exit code 0 [2021-11-23 17:09:13,323 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:13,323 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:09:13,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:09:13,323 INFO L85 PathProgramCache]: Analyzing trace with hash 1362739138, now seen corresponding path program 1 times [2021-11-23 17:09:13,324 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:09:13,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [152427423] [2021-11-23 17:09:13,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:13,324 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:09:13,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:09:13,325 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:09:13,330 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 17:09:13,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:13,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:09:13,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:15,050 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 17:09:15,051 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:15,494 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 17:09:15,494 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:15,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [152427423] [2021-11-23 17:09:15,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [152427423] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:15,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [789278590] [2021-11-23 17:09:15,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:15,495 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:15,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:09:15,495 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:09:15,520 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2021-11-23 17:09:15,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:15,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:09:15,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:17,126 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 17:09:17,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:17,390 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 17:09:17,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [789278590] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:17,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [59960513] [2021-11-23 17:09:17,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:17,391 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:09:17,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:09:17,392 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:09:17,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-23 17:09:17,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:17,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:09:17,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:18,864 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 17:09:18,865 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:19,100 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 17:09:19,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [59960513] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:19,101 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:09:19,101 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 10, 9] total 18 [2021-11-23 17:09:19,101 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350017480] [2021-11-23 17:09:19,101 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:09:19,102 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:09:19,102 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:19,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:09:19,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:09:19,103 INFO L87 Difference]: Start difference. First operand 2590 states and 4050 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 17:09:19,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:09:19,318 INFO L93 Difference]: Finished difference Result 3014 states and 4605 transitions. [2021-11-23 17:09:19,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:09:19,318 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 17:09:19,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:09:19,321 INFO L225 Difference]: With dead ends: 3014 [2021-11-23 17:09:19,321 INFO L226 Difference]: Without dead ends: 2582 [2021-11-23 17:09:19,323 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 17:09:19,323 INFO L933 BasicCegarLoop]: 1507 mSDtfsCounter, 2921 mSDsluCounter, 10593 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2921 SdHoareTripleChecker+Valid, 12100 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:09:19,324 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2921 Valid, 12100 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 56 Invalid, 0 Unknown, 47 Unchecked, 0.1s Time] [2021-11-23 17:09:19,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2582 states. [2021-11-23 17:09:19,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2582 to 2570. [2021-11-23 17:09:19,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2570 states, 2568 states have (on average 1.5677570093457944) internal successors, (4026), 2569 states have internal predecessors, (4026), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:19,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2570 states to 2570 states and 4026 transitions. [2021-11-23 17:09:19,426 INFO L78 Accepts]: Start accepts. Automaton has 2570 states and 4026 transitions. Word has length 69 [2021-11-23 17:09:19,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:09:19,426 INFO L470 AbstractCegarLoop]: Abstraction has 2570 states and 4026 transitions. [2021-11-23 17:09:19,427 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 17:09:19,427 INFO L276 IsEmpty]: Start isEmpty. Operand 2570 states and 4026 transitions. [2021-11-23 17:09:19,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:09:19,429 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:09:19,429 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 17:09:19,444 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:19,661 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2021-11-23 17:09:19,843 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:20,041 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:20,042 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:09:20,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:09:20,042 INFO L85 PathProgramCache]: Analyzing trace with hash 1940957519, now seen corresponding path program 1 times [2021-11-23 17:09:20,042 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:09:20,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1954537997] [2021-11-23 17:09:20,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:20,043 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:09:20,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:09:20,044 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:09:20,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-23 17:09:20,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:20,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:09:20,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:22,849 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 17:09:22,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:23,867 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 17:09:23,868 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:23,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1954537997] [2021-11-23 17:09:23,868 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1954537997] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:23,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [937064953] [2021-11-23 17:09:23,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:23,869 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:23,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:09:23,869 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:09:23,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2021-11-23 17:09:23,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:24,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:09:24,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:26,181 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 17:09:26,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:26,753 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 17:09:26,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [937064953] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:26,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [744412691] [2021-11-23 17:09:26,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:26,754 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:09:26,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:09:26,755 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:09:26,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-23 17:09:26,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:26,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:09:26,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:28,649 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 17:09:28,650 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:29,684 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 17:09:29,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [744412691] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:29,685 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:09:29,685 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:09:29,685 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527133959] [2021-11-23 17:09:29,686 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:09:29,687 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:09:29,687 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:29,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:09:29,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:09:29,689 INFO L87 Difference]: Start difference. First operand 2570 states and 4026 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 17:09:30,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:09:30,603 INFO L93 Difference]: Finished difference Result 3603 states and 5351 transitions. [2021-11-23 17:09:30,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:09:30,603 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 17:09:30,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:09:30,606 INFO L225 Difference]: With dead ends: 3603 [2021-11-23 17:09:30,606 INFO L226 Difference]: Without dead ends: 2604 [2021-11-23 17:09:30,608 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 673 GetRequests, 631 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=250, Invalid=1642, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:09:30,609 INFO L933 BasicCegarLoop]: 1514 mSDtfsCounter, 8743 mSDsluCounter, 24284 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8743 SdHoareTripleChecker+Valid, 25798 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 94 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:09:30,609 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8743 Valid, 25798 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 55 Invalid, 0 Unknown, 94 Unchecked, 0.1s Time] [2021-11-23 17:09:30,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2604 states. [2021-11-23 17:09:30,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2604 to 2604. [2021-11-23 17:09:30,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2604 states, 2602 states have (on average 1.5614911606456572) internal successors, (4063), 2603 states have internal predecessors, (4063), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:30,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2604 states to 2604 states and 4063 transitions. [2021-11-23 17:09:30,685 INFO L78 Accepts]: Start accepts. Automaton has 2604 states and 4063 transitions. Word has length 111 [2021-11-23 17:09:30,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:09:30,686 INFO L470 AbstractCegarLoop]: Abstraction has 2604 states and 4063 transitions. [2021-11-23 17:09:30,686 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 17:09:30,686 INFO L276 IsEmpty]: Start isEmpty. Operand 2604 states and 4063 transitions. [2021-11-23 17:09:30,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:09:30,688 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:09:30,688 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 17:09:30,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:30,911 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:31,103 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:31,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:31,301 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:09:31,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:09:31,302 INFO L85 PathProgramCache]: Analyzing trace with hash -721276639, now seen corresponding path program 1 times [2021-11-23 17:09:31,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:09:31,302 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1487991625] [2021-11-23 17:09:31,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:31,303 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:09:31,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:09:31,305 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:09:31,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-23 17:09:31,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:31,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:09:31,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:34,174 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 17:09:34,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:35,265 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 17:09:35,265 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:35,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1487991625] [2021-11-23 17:09:35,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1487991625] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:35,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [792081684] [2021-11-23 17:09:35,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:35,266 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:35,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:09:35,267 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:09:35,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-11-23 17:09:35,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:35,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:09:35,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:37,651 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 17:09:37,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:38,335 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 17:09:38,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [792081684] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:38,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [653512281] [2021-11-23 17:09:38,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:38,336 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:09:38,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:09:38,337 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:09:38,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-23 17:09:38,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:38,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:09:38,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:40,824 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 17:09:40,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:41,630 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 17:09:41,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [653512281] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:41,630 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:09:41,630 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:09:41,630 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332014468] [2021-11-23 17:09:41,631 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:09:41,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:09:41,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:41,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:09:41,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:09:41,634 INFO L87 Difference]: Start difference. First operand 2604 states and 4063 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 17:09:42,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:09:42,494 INFO L93 Difference]: Finished difference Result 3693 states and 5453 transitions. [2021-11-23 17:09:42,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:09:42,494 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 17:09:42,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:09:42,497 INFO L225 Difference]: With dead ends: 3693 [2021-11-23 17:09:42,497 INFO L226 Difference]: Without dead ends: 2694 [2021-11-23 17:09:42,498 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 674 GetRequests, 632 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 447 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=244, Invalid=1648, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:09:42,499 INFO L933 BasicCegarLoop]: 1518 mSDtfsCounter, 5845 mSDsluCounter, 34732 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5845 SdHoareTripleChecker+Valid, 36250 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 121 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:09:42,500 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5845 Valid, 36250 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 29 Invalid, 0 Unknown, 121 Unchecked, 0.0s Time] [2021-11-23 17:09:42,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2694 states. [2021-11-23 17:09:42,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2694 to 2694. [2021-11-23 17:09:42,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2694 states, 2692 states have (on average 1.5468053491827638) internal successors, (4164), 2693 states have internal predecessors, (4164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:42,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2694 states to 2694 states and 4164 transitions. [2021-11-23 17:09:42,616 INFO L78 Accepts]: Start accepts. Automaton has 2694 states and 4164 transitions. Word has length 111 [2021-11-23 17:09:42,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:09:42,617 INFO L470 AbstractCegarLoop]: Abstraction has 2694 states and 4164 transitions. [2021-11-23 17:09:42,617 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 17:09:42,617 INFO L276 IsEmpty]: Start isEmpty. Operand 2694 states and 4164 transitions. [2021-11-23 17:09:42,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:09:42,619 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:09:42,619 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 17:09:42,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:42,830 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Ended with exit code 0 [2021-11-23 17:09:43,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:43,221 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:09:43,222 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:09:43,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:09:43,222 INFO L85 PathProgramCache]: Analyzing trace with hash 1868570961, now seen corresponding path program 1 times [2021-11-23 17:09:43,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:09:43,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [41016138] [2021-11-23 17:09:43,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:43,223 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:09:43,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:09:43,224 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:09:43,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 17:09:43,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:43,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:09:43,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:45,448 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 17:09:45,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:46,313 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 17:09:46,313 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:46,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [41016138] [2021-11-23 17:09:46,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [41016138] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:46,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1889949461] [2021-11-23 17:09:46,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:46,314 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:46,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:09:46,315 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:09:46,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2021-11-23 17:09:46,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:46,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:09:46,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:50,140 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 17:09:50,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:51,350 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 17:09:51,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1889949461] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:51,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057681826] [2021-11-23 17:09:51,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:51,351 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:09:51,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:09:51,358 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:09:51,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-23 17:09:51,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:51,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:09:51,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:53,997 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 17:09:53,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:54,894 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 17:09:54,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2057681826] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:54,894 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:09:54,895 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:09:54,895 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361272948] [2021-11-23 17:09:54,895 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:09:54,896 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:09:54,896 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:54,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:09:54,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:09:54,897 INFO L87 Difference]: Start difference. First operand 2694 states and 4164 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 17:09:57,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:09:57,461 INFO L93 Difference]: Finished difference Result 3788 states and 5561 transitions. [2021-11-23 17:09:57,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 17:09:57,462 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 17:09:57,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:09:57,464 INFO L225 Difference]: With dead ends: 3788 [2021-11-23 17:09:57,464 INFO L226 Difference]: Without dead ends: 2789 [2021-11-23 17:09:57,467 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 689 GetRequests, 620 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1121 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=454, Invalid=4102, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 17:09:57,467 INFO L933 BasicCegarLoop]: 1518 mSDtfsCounter, 11668 mSDsluCounter, 41117 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11668 SdHoareTripleChecker+Valid, 42635 SdHoareTripleChecker+Invalid, 308 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 220 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:09:57,468 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11668 Valid, 42635 Invalid, 308 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 79 Invalid, 0 Unknown, 220 Unchecked, 0.1s Time] [2021-11-23 17:09:57,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2789 states. [2021-11-23 17:09:57,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2789 to 2785. [2021-11-23 17:09:57,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2785 states, 2783 states have (on average 1.5339561624146605) internal successors, (4269), 2784 states have internal predecessors, (4269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:09:57,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2785 states to 2785 states and 4269 transitions. [2021-11-23 17:09:57,550 INFO L78 Accepts]: Start accepts. Automaton has 2785 states and 4269 transitions. Word has length 111 [2021-11-23 17:09:57,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:09:57,550 INFO L470 AbstractCegarLoop]: Abstraction has 2785 states and 4269 transitions. [2021-11-23 17:09:57,550 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 17:09:57,550 INFO L276 IsEmpty]: Start isEmpty. Operand 2785 states and 4269 transitions. [2021-11-23 17:09:57,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:09:57,552 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:09:57,552 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 17:09:57,577 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:57,754 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Ended with exit code 0 [2021-11-23 17:09:57,962 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Forceful destruction successful, exit code 0 [2021-11-23 17:09:58,153 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:09:58,153 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:09:58,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:09:58,154 INFO L85 PathProgramCache]: Analyzing trace with hash -1694478255, now seen corresponding path program 1 times [2021-11-23 17:09:58,154 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:09:58,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1399960206] [2021-11-23 17:09:58,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:58,155 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:09:58,155 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:09:58,156 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:09:58,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-23 17:09:58,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:58,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:09:58,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:00,317 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 17:10:00,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:01,185 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 17:10:01,185 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:01,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1399960206] [2021-11-23 17:10:01,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1399960206] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:01,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [313404407] [2021-11-23 17:10:01,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:01,185 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:10:01,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:10:01,187 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:10:01,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2021-11-23 17:10:01,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:01,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:10:01,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:04,869 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 17:10:04,869 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:05,922 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 17:10:05,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [313404407] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:05,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [126694254] [2021-11-23 17:10:05,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:05,923 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:10:05,923 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:10:05,928 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:10:05,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-23 17:10:05,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:05,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:10:05,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:08,115 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 17:10:08,115 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:09,194 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 17:10:09,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [126694254] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:09,194 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:10:09,194 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:10:09,195 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126250385] [2021-11-23 17:10:09,195 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:10:09,196 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:10:09,196 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:09,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:10:09,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:10:09,197 INFO L87 Difference]: Start difference. First operand 2785 states and 4269 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 17:10:11,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:11,408 INFO L93 Difference]: Finished difference Result 3991 states and 5792 transitions. [2021-11-23 17:10:11,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:10:11,408 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 17:10:11,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:11,412 INFO L225 Difference]: With dead ends: 3991 [2021-11-23 17:10:11,413 INFO L226 Difference]: Without dead ends: 2992 [2021-11-23 17:10:11,416 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 686 GetRequests, 620 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=416, Invalid=3744, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 17:10:11,417 INFO L933 BasicCegarLoop]: 1517 mSDtfsCounter, 18937 mSDsluCounter, 26155 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18937 SdHoareTripleChecker+Valid, 27672 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 147 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:11,417 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18937 Valid, 27672 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 111 Invalid, 0 Unknown, 147 Unchecked, 0.1s Time] [2021-11-23 17:10:11,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2992 states. [2021-11-23 17:10:11,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2992 to 2988. [2021-11-23 17:10:11,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2988 states, 2986 states have (on average 1.5066979236436704) internal successors, (4499), 2987 states have internal predecessors, (4499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:11,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2988 states to 2988 states and 4499 transitions. [2021-11-23 17:10:11,522 INFO L78 Accepts]: Start accepts. Automaton has 2988 states and 4499 transitions. Word has length 111 [2021-11-23 17:10:11,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:11,523 INFO L470 AbstractCegarLoop]: Abstraction has 2988 states and 4499 transitions. [2021-11-23 17:10:11,523 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 17:10:11,523 INFO L276 IsEmpty]: Start isEmpty. Operand 2988 states and 4499 transitions. [2021-11-23 17:10:11,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 17:10:11,524 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:11,525 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 17:10:11,533 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:11,745 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2021-11-23 17:10:11,926 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Ended with exit code 0 [2021-11-23 17:10:12,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:10:12,126 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:12,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:12,126 INFO L85 PathProgramCache]: Analyzing trace with hash -1930363055, now seen corresponding path program 1 times [2021-11-23 17:10:12,126 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:12,126 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1438364071] [2021-11-23 17:10:12,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:12,126 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:12,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:12,127 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:12,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2021-11-23 17:10:12,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:12,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:10:12,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:13,850 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 17:10:13,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:14,777 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 17:10:14,778 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:14,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1438364071] [2021-11-23 17:10:14,778 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1438364071] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:14,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [300411674] [2021-11-23 17:10:14,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:14,778 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:10:14,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:10:14,780 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:10:14,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Waiting until timeout for monitored process [2021-11-23 17:10:14,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:14,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:10:14,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:17,263 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 17:10:17,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:18,118 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 17:10:18,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [300411674] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:18,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1436198700] [2021-11-23 17:10:18,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:18,119 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:10:18,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:10:18,141 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:10:18,177 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-23 17:10:18,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:18,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:10:18,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:20,155 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 17:10:20,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:21,362 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 17:10:21,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1436198700] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:21,363 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:10:21,363 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 17:10:21,364 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695045452] [2021-11-23 17:10:21,364 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:10:21,365 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 17:10:21,365 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:21,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 17:10:21,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 17:10:21,366 INFO L87 Difference]: Start difference. First operand 2988 states and 4499 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 17:10:23,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:10:23,251 INFO L93 Difference]: Finished difference Result 3989 states and 5787 transitions. [2021-11-23 17:10:23,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:10:23,252 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 17:10:23,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:10:23,257 INFO L225 Difference]: With dead ends: 3989 [2021-11-23 17:10:23,257 INFO L226 Difference]: Without dead ends: 2990 [2021-11-23 17:10:23,260 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 627 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 731 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=365, Invalid=2605, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:10:23,261 INFO L933 BasicCegarLoop]: 1505 mSDtfsCounter, 11765 mSDsluCounter, 29953 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11765 SdHoareTripleChecker+Valid, 31458 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 90 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:10:23,262 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11765 Valid, 31458 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 62 Invalid, 0 Unknown, 90 Unchecked, 0.1s Time] [2021-11-23 17:10:23,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2990 states. [2021-11-23 17:10:23,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2990 to 2988. [2021-11-23 17:10:23,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2988 states, 2986 states have (on average 1.505023442732753) internal successors, (4494), 2987 states have internal predecessors, (4494), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:10:23,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2988 states to 2988 states and 4494 transitions. [2021-11-23 17:10:23,461 INFO L78 Accepts]: Start accepts. Automaton has 2988 states and 4494 transitions. Word has length 111 [2021-11-23 17:10:23,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:10:23,462 INFO L470 AbstractCegarLoop]: Abstraction has 2988 states and 4494 transitions. [2021-11-23 17:10:23,462 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 17:10:23,463 INFO L276 IsEmpty]: Start isEmpty. Operand 2988 states and 4494 transitions. [2021-11-23 17:10:23,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:10:23,465 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:10:23,465 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 17:10:23,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:23,704 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Ended with exit code 0 [2021-11-23 17:10:23,881 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Forceful destruction successful, exit code 0 [2021-11-23 17:10:24,080 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:10:24,080 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:10:24,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:10:24,081 INFO L85 PathProgramCache]: Analyzing trace with hash 1699429479, now seen corresponding path program 1 times [2021-11-23 17:10:24,081 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:10:24,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [507675704] [2021-11-23 17:10:24,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:24,082 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:10:24,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:10:24,083 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:10:24,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Waiting until timeout for monitored process [2021-11-23 17:10:24,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:24,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:10:24,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:31,439 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 17:10:31,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:34,478 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 17:10:34,478 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:10:34,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [507675704] [2021-11-23 17:10:34,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [507675704] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:34,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [472537124] [2021-11-23 17:10:34,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:34,479 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:10:34,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:10:34,481 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:10:34,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Waiting until timeout for monitored process [2021-11-23 17:10:34,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:34,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:10:34,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:39,775 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 17:10:39,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:43,810 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 17:10:43,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [472537124] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:43,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [120344751] [2021-11-23 17:10:43,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:43,811 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:10:43,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:10:43,811 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:10:43,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-23 17:10:43,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:43,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 17:10:43,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:51,239 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 17:10:51,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:54,379 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 17:10:54,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [120344751] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:54,379 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:10:54,380 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20, 20, 24, 22, 21] total 99 [2021-11-23 17:10:54,380 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765109418] [2021-11-23 17:10:54,380 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:10:54,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2021-11-23 17:10:54,381 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:10:54,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2021-11-23 17:10:54,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1107, Invalid=8595, Unknown=0, NotChecked=0, Total=9702 [2021-11-23 17:10:54,385 INFO L87 Difference]: Start difference. First operand 2988 states and 4494 transitions. Second operand has 99 states, 99 states have (on average 4.646464646464646) internal successors, (460), 99 states have internal predecessors, (460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:12,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:12,441 INFO L93 Difference]: Finished difference Result 7891 states and 10493 transitions. [2021-11-23 17:11:12,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-11-23 17:11:12,442 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 4.646464646464646) internal successors, (460), 99 states have internal predecessors, (460), 0 states have call successors, (0), 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 17:11:12,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:12,448 INFO L225 Difference]: With dead ends: 7891 [2021-11-23 17:11:12,448 INFO L226 Difference]: Without dead ends: 6658 [2021-11-23 17:11:12,451 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 725 GetRequests, 569 SyntacticMatches, 7 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8046 ImplicationChecksByTransitivity, 29.0s TimeCoverageRelationStatistics Valid=2152, Invalid=20498, Unknown=0, NotChecked=0, Total=22650 [2021-11-23 17:11:12,452 INFO L933 BasicCegarLoop]: 1667 mSDtfsCounter, 9344 mSDsluCounter, 54543 mSDsCounter, 0 mSdLazyCounter, 1889 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9344 SdHoareTripleChecker+Valid, 56210 SdHoareTripleChecker+Invalid, 2645 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 1889 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 709 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:12,452 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9344 Valid, 56210 Invalid, 2645 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [47 Valid, 1889 Invalid, 0 Unknown, 709 Unchecked, 4.1s Time] [2021-11-23 17:11:12,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6658 states. [2021-11-23 17:11:12,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6658 to 5074. [2021-11-23 17:11:12,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5074 states, 5072 states have (on average 1.403391167192429) internal successors, (7118), 5073 states have internal predecessors, (7118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:12,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5074 states to 5074 states and 7118 transitions. [2021-11-23 17:11:12,831 INFO L78 Accepts]: Start accepts. Automaton has 5074 states and 7118 transitions. Word has length 112 [2021-11-23 17:11:12,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:12,831 INFO L470 AbstractCegarLoop]: Abstraction has 5074 states and 7118 transitions. [2021-11-23 17:11:12,831 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 99 states have (on average 4.646464646464646) internal successors, (460), 99 states have internal predecessors, (460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:12,831 INFO L276 IsEmpty]: Start isEmpty. Operand 5074 states and 7118 transitions. [2021-11-23 17:11:12,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:11:12,833 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:12,834 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:11:12,861 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:13,073 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Ended with exit code 0 [2021-11-23 17:11:13,250 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Ended with exit code 0 [2021-11-23 17:11:13,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:13,450 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:13,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:13,450 INFO L85 PathProgramCache]: Analyzing trace with hash -1264396281, now seen corresponding path program 1 times [2021-11-23 17:11:13,450 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:13,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1654930838] [2021-11-23 17:11:13,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:13,451 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:13,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:13,452 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:13,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2021-11-23 17:11:13,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:13,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:11:13,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:15,002 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 17:11:15,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:15,854 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 17:11:15,854 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:15,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1654930838] [2021-11-23 17:11:15,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1654930838] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:15,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1211706216] [2021-11-23 17:11:15,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:15,855 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:15,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:11:15,855 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:11:15,857 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Waiting until timeout for monitored process [2021-11-23 17:11:16,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:16,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:11:16,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:17,375 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 17:11:17,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:18,057 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 17:11:18,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1211706216] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:18,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [468972369] [2021-11-23 17:11:18,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:18,057 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:18,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:11:18,058 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:11:18,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-23 17:11:18,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:18,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:11:18,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:19,491 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 17:11:19,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:20,186 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 17:11:20,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [468972369] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:20,186 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:11:20,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:11:20,187 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777543908] [2021-11-23 17:11:20,187 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:11:20,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:11:20,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:20,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:11:20,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:11:20,188 INFO L87 Difference]: Start difference. First operand 5074 states and 7118 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 17:11:20,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:20,977 INFO L93 Difference]: Finished difference Result 8821 states and 11863 transitions. [2021-11-23 17:11:20,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:11:20,977 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 17:11:20,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:20,983 INFO L225 Difference]: With dead ends: 8821 [2021-11-23 17:11:20,984 INFO L226 Difference]: Without dead ends: 5735 [2021-11-23 17:11:20,987 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 675 GetRequests, 653 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=119, Invalid=433, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:11:20,987 INFO L933 BasicCegarLoop]: 1515 mSDtfsCounter, 5863 mSDsluCounter, 10781 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5863 SdHoareTripleChecker+Valid, 12296 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 64 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:20,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5863 Valid, 12296 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 29 Invalid, 0 Unknown, 64 Unchecked, 0.0s Time] [2021-11-23 17:11:20,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5735 states. [2021-11-23 17:11:21,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5735 to 5711. [2021-11-23 17:11:21,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5711 states, 5709 states have (on average 1.3874583990190927) internal successors, (7921), 5710 states have internal predecessors, (7921), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:21,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5711 states to 5711 states and 7921 transitions. [2021-11-23 17:11:21,466 INFO L78 Accepts]: Start accepts. Automaton has 5711 states and 7921 transitions. Word has length 112 [2021-11-23 17:11:21,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:21,466 INFO L470 AbstractCegarLoop]: Abstraction has 5711 states and 7921 transitions. [2021-11-23 17:11:21,467 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 17:11:21,467 INFO L276 IsEmpty]: Start isEmpty. Operand 5711 states and 7921 transitions. [2021-11-23 17:11:21,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:11:21,470 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:21,470 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 17:11:21,482 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:21,682 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Ended with exit code 0 [2021-11-23 17:11:21,898 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Ended with exit code 0 [2021-11-23 17:11:22,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:22,073 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:22,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:22,073 INFO L85 PathProgramCache]: Analyzing trace with hash -1336782839, now seen corresponding path program 1 times [2021-11-23 17:11:22,074 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:22,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1650678979] [2021-11-23 17:11:22,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:22,074 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:22,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:22,075 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:22,077 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Waiting until timeout for monitored process [2021-11-23 17:11:22,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:22,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:11:22,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:23,325 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 17:11:23,325 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:11:23,325 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:23,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1650678979] [2021-11-23 17:11:23,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1650678979] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:11:23,326 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:11:23,326 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:11:23,326 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793306291] [2021-11-23 17:11:23,326 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:11:23,327 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:11:23,327 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:23,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:11:23,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:11:23,327 INFO L87 Difference]: Start difference. First operand 5711 states and 7921 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 17:11:23,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:23,824 INFO L93 Difference]: Finished difference Result 9447 states and 12655 transitions. [2021-11-23 17:11:23,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:11:23,825 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 17:11:23,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:23,831 INFO L225 Difference]: With dead ends: 9447 [2021-11-23 17:11:23,832 INFO L226 Difference]: Without dead ends: 6361 [2021-11-23 17:11:23,835 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 17:11:23,836 INFO L933 BasicCegarLoop]: 1514 mSDtfsCounter, 1496 mSDsluCounter, 1607 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1496 SdHoareTripleChecker+Valid, 3121 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 38 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:23,836 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1496 Valid, 3121 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 38 Unchecked, 0.0s Time] [2021-11-23 17:11:23,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6361 states. [2021-11-23 17:11:24,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6361 to 6339. [2021-11-23 17:11:24,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6339 states, 6337 states have (on average 1.3716269528167904) internal successors, (8692), 6338 states have internal predecessors, (8692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:24,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6339 states to 6339 states and 8692 transitions. [2021-11-23 17:11:24,330 INFO L78 Accepts]: Start accepts. Automaton has 6339 states and 8692 transitions. Word has length 112 [2021-11-23 17:11:24,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:24,330 INFO L470 AbstractCegarLoop]: Abstraction has 6339 states and 8692 transitions. [2021-11-23 17:11:24,330 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 17:11:24,331 INFO L276 IsEmpty]: Start isEmpty. Operand 6339 states and 8692 transitions. [2021-11-23 17:11:24,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:11:24,334 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:24,334 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 17:11:24,349 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:24,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:11:24,541 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:24,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:24,542 INFO L85 PathProgramCache]: Analyzing trace with hash -604864759, now seen corresponding path program 1 times [2021-11-23 17:11:24,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:24,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1732961506] [2021-11-23 17:11:24,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:24,542 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:24,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:24,547 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:24,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (73)] Waiting until timeout for monitored process [2021-11-23 17:11:24,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:24,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:11:24,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:26,824 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 17:11:26,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:27,596 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 17:11:27,596 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:27,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1732961506] [2021-11-23 17:11:27,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1732961506] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:27,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [652455165] [2021-11-23 17:11:27,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:27,597 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:27,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:11:27,598 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:11:27,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (74)] Waiting until timeout for monitored process [2021-11-23 17:11:27,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:27,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:11:27,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:29,432 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 17:11:29,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:30,278 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 17:11:30,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [652455165] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:30,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355806488] [2021-11-23 17:11:30,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:30,279 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:30,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:11:30,279 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:11:30,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2021-11-23 17:11:30,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:30,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:11:30,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:31,574 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 17:11:31,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:32,191 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 17:11:32,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355806488] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:32,191 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:11:32,191 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:11:32,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908878684] [2021-11-23 17:11:32,192 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:11:32,193 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:11:32,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:32,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:11:32,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:11:32,194 INFO L87 Difference]: Start difference. First operand 6339 states and 8692 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 17:11:34,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:34,324 INFO L93 Difference]: Finished difference Result 12223 states and 16083 transitions. [2021-11-23 17:11:34,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:11:34,325 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 17:11:34,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:34,331 INFO L225 Difference]: With dead ends: 12223 [2021-11-23 17:11:34,331 INFO L226 Difference]: Without dead ends: 8509 [2021-11-23 17:11:34,335 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 693 GetRequests, 641 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=310, Invalid=2342, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 17:11:34,335 INFO L933 BasicCegarLoop]: 1525 mSDtfsCounter, 11748 mSDsluCounter, 24565 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11748 SdHoareTripleChecker+Valid, 26090 SdHoareTripleChecker+Invalid, 345 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 243 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:34,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11748 Valid, 26090 Invalid, 345 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 94 Invalid, 0 Unknown, 243 Unchecked, 0.1s Time] [2021-11-23 17:11:34,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8509 states. [2021-11-23 17:11:34,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8509 to 8489. [2021-11-23 17:11:34,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8489 states, 8487 states have (on average 1.3363968422292918) internal successors, (11342), 8488 states have internal predecessors, (11342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:34,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8489 states to 8489 states and 11342 transitions. [2021-11-23 17:11:34,876 INFO L78 Accepts]: Start accepts. Automaton has 8489 states and 11342 transitions. Word has length 112 [2021-11-23 17:11:34,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:34,876 INFO L470 AbstractCegarLoop]: Abstraction has 8489 states and 11342 transitions. [2021-11-23 17:11:34,876 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 17:11:34,877 INFO L276 IsEmpty]: Start isEmpty. Operand 8489 states and 11342 transitions. [2021-11-23 17:11:34,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:11:34,879 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:34,880 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 17:11:34,914 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:35,113 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (73)] Ended with exit code 0 [2021-11-23 17:11:35,306 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (74)] Ended with exit code 0 [2021-11-23 17:11:35,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:35,505 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:35,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:35,506 INFO L85 PathProgramCache]: Analyzing trace with hash -840749559, now seen corresponding path program 1 times [2021-11-23 17:11:35,506 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:35,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [757897156] [2021-11-23 17:11:35,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:35,507 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:35,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:35,541 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:35,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (76)] Waiting until timeout for monitored process [2021-11-23 17:11:35,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:35,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:11:35,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:37,315 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 17:11:37,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:38,177 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 17:11:38,177 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:38,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [757897156] [2021-11-23 17:11:38,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [757897156] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:38,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [983363408] [2021-11-23 17:11:38,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:38,178 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:38,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:11:38,181 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:11:38,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (77)] Waiting until timeout for monitored process [2021-11-23 17:11:38,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:38,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:11:38,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:39,635 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 17:11:39,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:40,216 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 17:11:40,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [983363408] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:40,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [53392688] [2021-11-23 17:11:40,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:40,217 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:40,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:11:40,221 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:11:40,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2021-11-23 17:11:40,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:40,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:11:40,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:41,465 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 17:11:41,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:42,104 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 17:11:42,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [53392688] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:42,105 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:11:42,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 19 [2021-11-23 17:11:42,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314439319] [2021-11-23 17:11:42,105 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:11:42,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 17:11:42,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:42,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 17:11:42,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:11:42,107 INFO L87 Difference]: Start difference. First operand 8489 states and 11342 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 17:11:43,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:43,462 INFO L93 Difference]: Finished difference Result 15926 states and 20668 transitions. [2021-11-23 17:11:43,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 17:11:43,462 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 17:11:43,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:43,473 INFO L225 Difference]: With dead ends: 15926 [2021-11-23 17:11:43,473 INFO L226 Difference]: Without dead ends: 12212 [2021-11-23 17:11:43,478 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 679 GetRequests, 651 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=155, Invalid=715, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:11:43,478 INFO L933 BasicCegarLoop]: 1531 mSDtfsCounter, 7474 mSDsluCounter, 10806 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7474 SdHoareTripleChecker+Valid, 12337 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 140 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:43,478 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7474 Valid, 12337 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 76 Invalid, 0 Unknown, 140 Unchecked, 0.1s Time] [2021-11-23 17:11:43,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12212 states. [2021-11-23 17:11:44,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12212 to 12188. [2021-11-23 17:11:44,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12188 states, 12186 states have (on average 1.3010832102412604) internal successors, (15855), 12187 states have internal predecessors, (15855), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:44,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12188 states to 12188 states and 15855 transitions. [2021-11-23 17:11:44,415 INFO L78 Accepts]: Start accepts. Automaton has 12188 states and 15855 transitions. Word has length 112 [2021-11-23 17:11:44,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:44,416 INFO L470 AbstractCegarLoop]: Abstraction has 12188 states and 15855 transitions. [2021-11-23 17:11:44,416 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 17:11:44,416 INFO L276 IsEmpty]: Start isEmpty. Operand 12188 states and 15855 transitions. [2021-11-23 17:11:44,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:11:44,419 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:44,419 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 17:11:44,437 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (76)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:44,633 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (77)] Ended with exit code 0 [2021-11-23 17:11:44,852 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Ended with exit code 0 [2021-11-23 17:11:45,032 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:45,032 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:45,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:45,033 INFO L85 PathProgramCache]: Analyzing trace with hash -7680944, now seen corresponding path program 1 times [2021-11-23 17:11:45,033 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:45,033 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1067816130] [2021-11-23 17:11:45,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:45,033 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:45,034 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:45,035 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:45,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Waiting until timeout for monitored process [2021-11-23 17:11:45,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:45,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:11:45,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:46,034 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 17:11:46,034 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:11:46,034 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:46,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1067816130] [2021-11-23 17:11:46,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1067816130] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:11:46,034 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:11:46,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:11:46,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857836650] [2021-11-23 17:11:46,035 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:11:46,035 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:11:46,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:46,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:11:46,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:11:46,036 INFO L87 Difference]: Start difference. First operand 12188 states and 15855 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 17:11:47,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:47,047 INFO L93 Difference]: Finished difference Result 19364 states and 24825 transitions. [2021-11-23 17:11:47,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:11:47,048 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 17:11:47,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:47,061 INFO L225 Difference]: With dead ends: 19364 [2021-11-23 17:11:47,061 INFO L226 Difference]: Without dead ends: 14713 [2021-11-23 17:11:47,066 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 17:11:47,066 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 2940 mSDsluCounter, 3028 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2940 SdHoareTripleChecker+Valid, 4549 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 41 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:47,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2940 Valid, 4549 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 41 Unchecked, 0.0s Time] [2021-11-23 17:11:47,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14713 states. [2021-11-23 17:11:48,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14713 to 14635. [2021-11-23 17:11:48,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14635 states, 14633 states have (on average 1.285997403129912) internal successors, (18818), 14634 states have internal predecessors, (18818), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:48,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14635 states to 14635 states and 18818 transitions. [2021-11-23 17:11:48,251 INFO L78 Accepts]: Start accepts. Automaton has 14635 states and 18818 transitions. Word has length 112 [2021-11-23 17:11:48,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:48,252 INFO L470 AbstractCegarLoop]: Abstraction has 14635 states and 18818 transitions. [2021-11-23 17:11:48,252 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 17:11:48,252 INFO L276 IsEmpty]: Start isEmpty. Operand 14635 states and 18818 transitions. [2021-11-23 17:11:48,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:11:48,254 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:48,254 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 17:11:48,262 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:48,455 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:11:48,455 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:48,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:48,455 INFO L85 PathProgramCache]: Analyzing trace with hash 1933874233, now seen corresponding path program 1 times [2021-11-23 17:11:48,456 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:48,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1842224651] [2021-11-23 17:11:48,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:48,456 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:48,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:48,457 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:48,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (80)] Waiting until timeout for monitored process [2021-11-23 17:11:48,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:48,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:11:48,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:50,195 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 17:11:50,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:50,787 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 17:11:50,787 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:50,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1842224651] [2021-11-23 17:11:50,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1842224651] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:50,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [13352517] [2021-11-23 17:11:50,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:50,788 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:50,788 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:11:50,789 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:11:50,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (81)] Waiting until timeout for monitored process [2021-11-23 17:11:50,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:50,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:11:50,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:52,434 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 17:11:52,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:52,874 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 17:11:52,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [13352517] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:52,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [527813060] [2021-11-23 17:11:52,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:52,875 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:52,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:11:52,876 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:11:52,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2021-11-23 17:11:52,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:52,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:11:52,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:54,605 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 17:11:54,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:55,064 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 17:11:55,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [527813060] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:55,065 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:11:55,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:11:55,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958582029] [2021-11-23 17:11:55,065 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:11:55,066 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:11:55,066 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:55,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:11:55,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:11:55,067 INFO L87 Difference]: Start difference. First operand 14635 states and 18818 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 17:11:56,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:56,922 INFO L93 Difference]: Finished difference Result 25798 states and 32779 transitions. [2021-11-23 17:11:56,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:11:56,922 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 17:11:56,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:56,941 INFO L225 Difference]: With dead ends: 25798 [2021-11-23 17:11:56,941 INFO L226 Difference]: Without dead ends: 20497 [2021-11-23 17:11:56,949 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 677 GetRequests, 655 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:11:56,949 INFO L933 BasicCegarLoop]: 1528 mSDtfsCounter, 7392 mSDsluCounter, 12124 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7392 SdHoareTripleChecker+Valid, 13652 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 82 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:56,949 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7392 Valid, 13652 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 33 Invalid, 0 Unknown, 82 Unchecked, 0.0s Time] [2021-11-23 17:11:56,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20497 states. [2021-11-23 17:11:58,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20497 to 20461. [2021-11-23 17:11:58,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20461 states, 20459 states have (on average 1.2658976489564495) internal successors, (25899), 20460 states have internal predecessors, (25899), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:11:58,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20461 states to 20461 states and 25899 transitions. [2021-11-23 17:11:58,527 INFO L78 Accepts]: Start accepts. Automaton has 20461 states and 25899 transitions. Word has length 112 [2021-11-23 17:11:58,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:58,528 INFO L470 AbstractCegarLoop]: Abstraction has 20461 states and 25899 transitions. [2021-11-23 17:11:58,528 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 17:11:58,528 INFO L276 IsEmpty]: Start isEmpty. Operand 20461 states and 25899 transitions. [2021-11-23 17:11:58,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:11:58,530 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:58,530 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 17:11:58,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (80)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:58,732 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (81)] Ended with exit code 0 [2021-11-23 17:11:58,950 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Ended with exit code 0 [2021-11-23 17:11:59,131 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:59,131 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:59,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:59,131 INFO L85 PathProgramCache]: Analyzing trace with hash 228754537, now seen corresponding path program 1 times [2021-11-23 17:11:59,132 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:59,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [687899106] [2021-11-23 17:11:59,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:59,132 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:59,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:59,133 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:59,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (83)] Waiting until timeout for monitored process [2021-11-23 17:11:59,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:59,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:11:59,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:01,376 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 17:12:01,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:02,343 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 17:12:02,343 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:12:02,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [687899106] [2021-11-23 17:12:02,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [687899106] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:02,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1216011464] [2021-11-23 17:12:02,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:02,344 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:12:02,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:12:02,345 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:12:02,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (84)] Waiting until timeout for monitored process [2021-11-23 17:12:02,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:02,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:12:02,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:04,666 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 17:12:04,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:05,427 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 17:12:05,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1216011464] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:05,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [860820359] [2021-11-23 17:12:05,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:05,428 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:12:05,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:12:05,429 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:12:05,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-23 17:12:05,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:05,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:12:05,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:07,272 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 17:12:07,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:07,867 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 17:12:07,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [860820359] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:07,867 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:12:07,867 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:12:07,868 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084546007] [2021-11-23 17:12:07,868 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:12:07,868 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:12:07,868 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:12:07,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:12:07,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:12:07,870 INFO L87 Difference]: Start difference. First operand 20461 states and 25899 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 17:12:11,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:12:11,497 INFO L93 Difference]: Finished difference Result 24764 states and 31305 transitions. [2021-11-23 17:12:11,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:12:11,497 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 17:12:11,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:12:11,518 INFO L225 Difference]: With dead ends: 24764 [2021-11-23 17:12:11,518 INFO L226 Difference]: Without dead ends: 21678 [2021-11-23 17:12:11,524 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 695 GetRequests, 644 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=308, Invalid=2242, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 17:12:11,524 INFO L933 BasicCegarLoop]: 1553 mSDtfsCounter, 11751 mSDsluCounter, 29081 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11751 SdHoareTripleChecker+Valid, 30634 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 131 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:12:11,524 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11751 Valid, 30634 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 59 Invalid, 0 Unknown, 131 Unchecked, 0.1s Time] [2021-11-23 17:12:11,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21678 states. [2021-11-23 17:12:13,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21678 to 21585. [2021-11-23 17:12:13,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21585 states, 21583 states have (on average 1.2645137376639022) internal successors, (27292), 21584 states have internal predecessors, (27292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:12:13,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21585 states to 21585 states and 27292 transitions. [2021-11-23 17:12:13,247 INFO L78 Accepts]: Start accepts. Automaton has 21585 states and 27292 transitions. Word has length 112 [2021-11-23 17:12:13,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:12:13,247 INFO L470 AbstractCegarLoop]: Abstraction has 21585 states and 27292 transitions. [2021-11-23 17:12:13,247 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 17:12:13,247 INFO L276 IsEmpty]: Start isEmpty. Operand 21585 states and 27292 transitions. [2021-11-23 17:12:13,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:12:13,250 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:12:13,250 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 17:12:13,262 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (83)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:13,451 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (84)] Ended with exit code 0 [2021-11-23 17:12:13,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:13,851 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:12:13,851 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:12:13,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:12:13,852 INFO L85 PathProgramCache]: Analyzing trace with hash 724787817, now seen corresponding path program 1 times [2021-11-23 17:12:13,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:12:13,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1926586400] [2021-11-23 17:12:13,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:13,852 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:12:13,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:12:13,854 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:12:13,855 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Waiting until timeout for monitored process [2021-11-23 17:12:13,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:13,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:12:13,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:14,936 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 17:12:14,936 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:12:14,936 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:12:14,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1926586400] [2021-11-23 17:12:14,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1926586400] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:12:14,937 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:12:14,937 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:12:14,937 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670593650] [2021-11-23 17:12:14,937 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:12:14,937 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:12:14,937 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:12:14,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:12:14,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:12:14,938 INFO L87 Difference]: Start difference. First operand 21585 states and 27292 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 17:12:16,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:12:16,878 INFO L93 Difference]: Finished difference Result 27699 states and 34965 transitions. [2021-11-23 17:12:16,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:12:16,878 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 17:12:16,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:12:16,911 INFO L225 Difference]: With dead ends: 27699 [2021-11-23 17:12:16,911 INFO L226 Difference]: Without dead ends: 24613 [2021-11-23 17:12:16,918 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 17:12:16,919 INFO L933 BasicCegarLoop]: 1526 mSDtfsCounter, 1510 mSDsluCounter, 1606 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1510 SdHoareTripleChecker+Valid, 3132 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 60 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:12:16,919 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1510 Valid, 3132 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 60 Unchecked, 0.0s Time] [2021-11-23 17:12:16,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24613 states. [2021-11-23 17:12:18,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24613 to 24483. [2021-11-23 17:12:18,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24483 states, 24481 states have (on average 1.2552183325844533) internal successors, (30729), 24482 states have internal predecessors, (30729), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:12:18,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24483 states to 24483 states and 30729 transitions. [2021-11-23 17:12:18,972 INFO L78 Accepts]: Start accepts. Automaton has 24483 states and 30729 transitions. Word has length 112 [2021-11-23 17:12:18,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:12:18,973 INFO L470 AbstractCegarLoop]: Abstraction has 24483 states and 30729 transitions. [2021-11-23 17:12:18,973 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 17:12:18,973 INFO L276 IsEmpty]: Start isEmpty. Operand 24483 states and 30729 transitions. [2021-11-23 17:12:18,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:12:18,975 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:12:18,976 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 17:12:18,984 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Ended with exit code 0 [2021-11-23 17:12:19,176 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:12:19,176 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:12:19,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:12:19,177 INFO L85 PathProgramCache]: Analyzing trace with hash 1117709487, now seen corresponding path program 1 times [2021-11-23 17:12:19,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:12:19,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [316684000] [2021-11-23 17:12:19,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:19,177 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:12:19,177 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:12:19,178 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:12:19,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (87)] Waiting until timeout for monitored process [2021-11-23 17:12:19,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:19,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:12:19,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:26,538 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 17:12:26,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:29,642 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 17:12:29,642 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:12:29,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [316684000] [2021-11-23 17:12:29,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [316684000] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:29,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [854547471] [2021-11-23 17:12:29,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:29,643 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:12:29,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:12:29,649 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:12:29,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (88)] Waiting until timeout for monitored process [2021-11-23 17:12:29,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:29,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 17:12:29,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:39,690 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 17:12:39,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:44,073 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 17:12:44,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [854547471] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:44,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [454202697] [2021-11-23 17:12:44,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:44,074 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:12:44,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:12:44,074 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:12:44,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2021-11-23 17:12:44,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:44,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:12:44,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:53,653 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 17:12:53,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:56,943 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 17:12:56,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [454202697] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:56,944 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:12:56,944 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20, 30, 24, 18, 17] total 101 [2021-11-23 17:12:56,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504960444] [2021-11-23 17:12:56,944 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:12:56,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2021-11-23 17:12:56,945 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:12:56,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2021-11-23 17:12:56,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=942, Invalid=9158, Unknown=0, NotChecked=0, Total=10100 [2021-11-23 17:12:56,948 INFO L87 Difference]: Start difference. First operand 24483 states and 30729 transitions. Second operand has 101 states, 101 states have (on average 4.96039603960396) internal successors, (501), 101 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 17:13:03,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:13:03,814 INFO L93 Difference]: Finished difference Result 34498 states and 42986 transitions. [2021-11-23 17:13:03,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-23 17:13:03,815 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 4.96039603960396) internal successors, (501), 101 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 17:13:03,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:13:03,849 INFO L225 Difference]: With dead ends: 34498 [2021-11-23 17:13:03,849 INFO L226 Difference]: Without dead ends: 27591 [2021-11-23 17:13:03,860 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 689 GetRequests, 575 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5207 ImplicationChecksByTransitivity, 19.4s TimeCoverageRelationStatistics Valid=1160, Invalid=11950, Unknown=0, NotChecked=0, Total=13110 [2021-11-23 17:13:03,860 INFO L933 BasicCegarLoop]: 1602 mSDtfsCounter, 17805 mSDsluCounter, 48785 mSDsCounter, 0 mSdLazyCounter, 713 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17805 SdHoareTripleChecker+Valid, 50387 SdHoareTripleChecker+Invalid, 1259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 713 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 513 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:13:03,861 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17805 Valid, 50387 Invalid, 1259 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [33 Valid, 713 Invalid, 0 Unknown, 513 Unchecked, 1.4s Time] [2021-11-23 17:13:03,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27591 states. [2021-11-23 17:13:05,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27591 to 24817. [2021-11-23 17:13:06,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24817 states, 24815 states have (on average 1.255369736046746) internal successors, (31152), 24816 states have internal predecessors, (31152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:06,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24817 states to 24817 states and 31152 transitions. [2021-11-23 17:13:06,042 INFO L78 Accepts]: Start accepts. Automaton has 24817 states and 31152 transitions. Word has length 113 [2021-11-23 17:13:06,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:13:06,043 INFO L470 AbstractCegarLoop]: Abstraction has 24817 states and 31152 transitions. [2021-11-23 17:13:06,043 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 4.96039603960396) internal successors, (501), 101 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 17:13:06,043 INFO L276 IsEmpty]: Start isEmpty. Operand 24817 states and 31152 transitions. [2021-11-23 17:13:06,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:13:06,046 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:13:06,047 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 17:13:06,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:06,255 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (87)] Ended with exit code 0 [2021-11-23 17:13:06,448 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (88)] Ended with exit code 0 [2021-11-23 17:13:06,647 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:13:06,647 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:13:06,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:13:06,648 INFO L85 PathProgramCache]: Analyzing trace with hash 2048005298, now seen corresponding path program 1 times [2021-11-23 17:13:06,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:13:06,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2015686786] [2021-11-23 17:13:06,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:06,648 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:13:06,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:13:06,649 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:13:06,652 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (90)] Waiting until timeout for monitored process [2021-11-23 17:13:06,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:06,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:13:06,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:07,965 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 17:13:07,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:08,621 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 17:13:08,621 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:13:08,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2015686786] [2021-11-23 17:13:08,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2015686786] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:08,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1584734458] [2021-11-23 17:13:08,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:08,622 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:13:08,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:13:08,623 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:13:08,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (91)] Waiting until timeout for monitored process [2021-11-23 17:13:08,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:08,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:13:08,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:09,790 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 17:13:09,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:10,154 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 17:13:10,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1584734458] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:10,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1143066929] [2021-11-23 17:13:10,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:10,154 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:13:10,155 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:13:10,155 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:13:10,156 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Waiting until timeout for monitored process [2021-11-23 17:13:10,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:10,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:13:10,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:11,117 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 17:13:11,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:11,481 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 17:13:11,482 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1143066929] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:11,482 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:13:11,482 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 14, 11, 12, 11] total 27 [2021-11-23 17:13:11,482 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573714351] [2021-11-23 17:13:11,482 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:13:11,483 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-23 17:13:11,483 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:13:11,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-23 17:13:11,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=606, Unknown=0, NotChecked=0, Total=702 [2021-11-23 17:13:11,483 INFO L87 Difference]: Start difference. First operand 24817 states and 31152 transitions. Second operand has 27 states, 27 states have (on average 8.814814814814815) internal successors, (238), 27 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:15,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:13:15,638 INFO L93 Difference]: Finished difference Result 52399 states and 65607 transitions. [2021-11-23 17:13:15,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:13:15,639 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 8.814814814814815) internal successors, (238), 27 states have internal predecessors, (238), 0 states have call successors, (0), 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 17:13:15,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:13:15,692 INFO L225 Difference]: With dead ends: 52399 [2021-11-23 17:13:15,692 INFO L226 Difference]: Without dead ends: 43823 [2021-11-23 17:13:15,703 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 685 GetRequests, 650 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=185, Invalid=1147, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 17:13:15,704 INFO L933 BasicCegarLoop]: 1584 mSDtfsCounter, 9225 mSDsluCounter, 19440 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9225 SdHoareTripleChecker+Valid, 21024 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 95 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:13:15,704 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9225 Valid, 21024 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 134 Invalid, 0 Unknown, 95 Unchecked, 0.2s Time] [2021-11-23 17:13:15,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43823 states. [2021-11-23 17:13:19,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43823 to 38051. [2021-11-23 17:13:19,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38051 states, 38049 states have (on average 1.2496780467292177) internal successors, (47549), 38050 states have internal predecessors, (47549), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:19,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38051 states to 38051 states and 47549 transitions. [2021-11-23 17:13:19,260 INFO L78 Accepts]: Start accepts. Automaton has 38051 states and 47549 transitions. Word has length 113 [2021-11-23 17:13:19,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:13:19,261 INFO L470 AbstractCegarLoop]: Abstraction has 38051 states and 47549 transitions. [2021-11-23 17:13:19,261 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 8.814814814814815) internal successors, (238), 27 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:19,261 INFO L276 IsEmpty]: Start isEmpty. Operand 38051 states and 47549 transitions. [2021-11-23 17:13:19,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:13:19,264 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:13:19,264 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 17:13:19,288 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:19,475 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (90)] Ended with exit code 0 [2021-11-23 17:13:19,669 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (91)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:19,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:13:19,865 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:13:19,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:13:19,865 INFO L85 PathProgramCache]: Analyzing trace with hash -1844428728, now seen corresponding path program 1 times [2021-11-23 17:13:19,866 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:13:19,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2124417933] [2021-11-23 17:13:19,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:19,866 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:13:19,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:13:19,866 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:13:19,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (93)] Waiting until timeout for monitored process [2021-11-23 17:13:19,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:19,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:13:19,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:21,537 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 17:13:21,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:22,425 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 17:13:22,426 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:13:22,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2124417933] [2021-11-23 17:13:22,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2124417933] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:22,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2009070607] [2021-11-23 17:13:22,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:22,426 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:13:22,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:13:22,427 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:13:22,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (94)] Waiting until timeout for monitored process [2021-11-23 17:13:22,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:22,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:13:22,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:23,844 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 17:13:23,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:24,338 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 17:13:24,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2009070607] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:24,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1469093967] [2021-11-23 17:13:24,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:24,339 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:13:24,339 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:13:24,340 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:13:24,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Waiting until timeout for monitored process [2021-11-23 17:13:24,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:24,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:13:24,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:29,368 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 17:13:29,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:30,732 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 17:13:30,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1469093967] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:30,733 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:13:30,733 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 14, 11, 19, 15] total 46 [2021-11-23 17:13:30,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878516209] [2021-11-23 17:13:30,733 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:13:30,734 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-23 17:13:30,734 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:13:30,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-23 17:13:30,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=1861, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 17:13:30,735 INFO L87 Difference]: Start difference. First operand 38051 states and 47549 transitions. Second operand has 46 states, 46 states have (on average 7.260869565217392) internal successors, (334), 46 states have internal predecessors, (334), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:38,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:13:38,013 INFO L93 Difference]: Finished difference Result 63626 states and 79365 transitions. [2021-11-23 17:13:38,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-23 17:13:38,014 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 7.260869565217392) internal successors, (334), 46 states have internal predecessors, (334), 0 states have call successors, (0), 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 17:13:38,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:13:38,174 INFO L225 Difference]: With dead ends: 63626 [2021-11-23 17:13:38,174 INFO L226 Difference]: Without dead ends: 50151 [2021-11-23 17:13:38,186 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 718 GetRequests, 644 SyntacticMatches, 5 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1545 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=499, Invalid=4471, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 17:13:38,187 INFO L933 BasicCegarLoop]: 1571 mSDtfsCounter, 7800 mSDsluCounter, 31839 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7800 SdHoareTripleChecker+Valid, 33410 SdHoareTripleChecker+Invalid, 573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 290 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:13:38,187 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7800 Valid, 33410 Invalid, 573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 271 Invalid, 0 Unknown, 290 Unchecked, 0.5s Time] [2021-11-23 17:13:38,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50151 states. [2021-11-23 17:13:42,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50151 to 46465. [2021-11-23 17:13:42,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46465 states, 46463 states have (on average 1.24649721283602) internal successors, (57916), 46464 states have internal predecessors, (57916), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:42,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46465 states to 46465 states and 57916 transitions. [2021-11-23 17:13:42,364 INFO L78 Accepts]: Start accepts. Automaton has 46465 states and 57916 transitions. Word has length 113 [2021-11-23 17:13:42,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:13:42,364 INFO L470 AbstractCegarLoop]: Abstraction has 46465 states and 57916 transitions. [2021-11-23 17:13:42,364 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 7.260869565217392) internal successors, (334), 46 states have internal predecessors, (334), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:13:42,365 INFO L276 IsEmpty]: Start isEmpty. Operand 46465 states and 57916 transitions. [2021-11-23 17:13:42,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:13:42,367 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:13:42,367 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 17:13:42,371 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (94)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:42,588 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Ended with exit code 0 [2021-11-23 17:13:42,776 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (93)] Ended with exit code 0 [2021-11-23 17:13:42,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:13:42,968 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:13:42,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:13:42,968 INFO L85 PathProgramCache]: Analyzing trace with hash 588226190, now seen corresponding path program 1 times [2021-11-23 17:13:42,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:13:42,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1860657848] [2021-11-23 17:13:42,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:42,968 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:13:42,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:13:42,970 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:13:42,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (96)] Waiting until timeout for monitored process [2021-11-23 17:13:43,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:43,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:13:43,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:50,900 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 17:13:50,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:55,747 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 17:13:55,747 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:13:55,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1860657848] [2021-11-23 17:13:55,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1860657848] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:55,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [814462409] [2021-11-23 17:13:55,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:55,747 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:13:55,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:13:55,748 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:13:55,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (97)] Waiting until timeout for monitored process [2021-11-23 17:13:55,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:55,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 17:13:55,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:05,488 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 17:14:05,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:14,090 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 17:14:14,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [814462409] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:14,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1417618962] [2021-11-23 17:14:14,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:14,090 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:14:14,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:14:14,091 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:14:14,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Waiting until timeout for monitored process [2021-11-23 17:14:14,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:14,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 17:14:14,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:21,107 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 17:14:21,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:27,795 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 17:14:27,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1417618962] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:27,795 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:14:27,796 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 30, 28, 24, 24] total 133 [2021-11-23 17:14:27,796 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346618311] [2021-11-23 17:14:27,796 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:14:27,797 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2021-11-23 17:14:27,797 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:27,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2021-11-23 17:14:27,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2045, Invalid=15511, Unknown=0, NotChecked=0, Total=17556 [2021-11-23 17:14:27,799 INFO L87 Difference]: Start difference. First operand 46465 states and 57916 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 17:14:56,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:56,960 INFO L93 Difference]: Finished difference Result 59639 states and 73740 transitions. [2021-11-23 17:14:56,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-23 17:14:56,961 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 17:14:56,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:57,032 INFO L225 Difference]: With dead ends: 59639 [2021-11-23 17:14:57,033 INFO L226 Difference]: Without dead ends: 51391 [2021-11-23 17:14:57,046 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 735 GetRequests, 553 SyntacticMatches, 5 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11516 ImplicationChecksByTransitivity, 44.2s TimeCoverageRelationStatistics Valid=3608, Invalid=28254, Unknown=0, NotChecked=0, Total=31862 [2021-11-23 17:14:57,047 INFO L933 BasicCegarLoop]: 1552 mSDtfsCounter, 53785 mSDsluCounter, 56919 mSDsCounter, 0 mSdLazyCounter, 2515 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53785 SdHoareTripleChecker+Valid, 58471 SdHoareTripleChecker+Invalid, 3246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 2515 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 633 IncrementalHoareTripleChecker+Unchecked, 5.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:14:57,047 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53785 Valid, 58471 Invalid, 3246 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [98 Valid, 2515 Invalid, 0 Unknown, 633 Unchecked, 5.4s Time] [2021-11-23 17:14:57,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51391 states. [2021-11-23 17:15:01,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51391 to 46509. [2021-11-23 17:15:01,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46509 states, 46507 states have (on average 1.2465435310813426) internal successors, (57973), 46508 states have internal predecessors, (57973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:01,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46509 states to 46509 states and 57973 transitions. [2021-11-23 17:15:01,831 INFO L78 Accepts]: Start accepts. Automaton has 46509 states and 57973 transitions. Word has length 113 [2021-11-23 17:15:01,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:01,831 INFO L470 AbstractCegarLoop]: Abstraction has 46509 states and 57973 transitions. [2021-11-23 17:15:01,831 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 17:15:01,831 INFO L276 IsEmpty]: Start isEmpty. Operand 46509 states and 57973 transitions. [2021-11-23 17:15:01,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:15:01,834 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:01,834 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 17:15:01,860 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Ended with exit code 0 [2021-11-23 17:15:02,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (97)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:02,243 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (96)] Ended with exit code 0 [2021-11-23 17:15:02,435 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:02,435 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:02,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:02,435 INFO L85 PathProgramCache]: Analyzing trace with hash -1890239409, now seen corresponding path program 1 times [2021-11-23 17:15:02,436 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:02,436 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1721048556] [2021-11-23 17:15:02,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:02,436 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:02,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:02,437 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:02,439 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (99)] Waiting until timeout for monitored process [2021-11-23 17:15:02,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:02,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:15:02,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:04,089 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 17:15:04,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:04,943 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 17:15:04,944 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:04,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1721048556] [2021-11-23 17:15:04,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1721048556] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:04,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1501202615] [2021-11-23 17:15:04,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:04,944 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:04,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:15:04,945 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:15:04,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (100)] Waiting until timeout for monitored process [2021-11-23 17:15:05,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:05,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:15:05,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:06,488 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 17:15:06,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:06,949 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 17:15:06,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1501202615] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:06,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1516549453] [2021-11-23 17:15:06,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:06,950 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:15:06,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:15:06,951 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:15:06,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Waiting until timeout for monitored process [2021-11-23 17:15:07,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:07,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:15:07,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:08,068 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 17:15:08,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:08,546 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 17:15:08,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1516549453] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:08,547 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:15:08,547 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 14, 11, 12, 11] total 28 [2021-11-23 17:15:08,547 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192833511] [2021-11-23 17:15:08,547 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:15:08,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 17:15:08,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:08,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 17:15:08,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=653, Unknown=0, NotChecked=0, Total=756 [2021-11-23 17:15:08,548 INFO L87 Difference]: Start difference. First operand 46509 states and 57973 transitions. Second operand has 28 states, 28 states have (on average 9.178571428571429) internal successors, (257), 28 states have internal predecessors, (257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:17,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:17,854 INFO L93 Difference]: Finished difference Result 99682 states and 123733 transitions. [2021-11-23 17:15:17,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-23 17:15:17,854 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 9.178571428571429) internal successors, (257), 28 states have internal predecessors, (257), 0 states have call successors, (0), 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 17:15:17,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:17,974 INFO L225 Difference]: With dead ends: 99682 [2021-11-23 17:15:17,974 INFO L226 Difference]: Without dead ends: 80715 [2021-11-23 17:15:17,997 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 696 GetRequests, 654 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 425 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=272, Invalid=1620, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:15:17,998 INFO L933 BasicCegarLoop]: 1587 mSDtfsCounter, 1873 mSDsluCounter, 18150 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1873 SdHoareTripleChecker+Valid, 19737 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 79 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:17,998 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1873 Valid, 19737 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 103 Invalid, 0 Unknown, 79 Unchecked, 0.2s Time] [2021-11-23 17:15:18,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80715 states. [2021-11-23 17:15:26,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80715 to 69257. [2021-11-23 17:15:26,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69257 states, 69255 states have (on average 1.2440401415060285) internal successors, (86156), 69256 states have internal predecessors, (86156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:26,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69257 states to 69257 states and 86156 transitions. [2021-11-23 17:15:26,890 INFO L78 Accepts]: Start accepts. Automaton has 69257 states and 86156 transitions. Word has length 113 [2021-11-23 17:15:26,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:26,890 INFO L470 AbstractCegarLoop]: Abstraction has 69257 states and 86156 transitions. [2021-11-23 17:15:26,890 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 9.178571428571429) internal successors, (257), 28 states have internal predecessors, (257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:26,890 INFO L276 IsEmpty]: Start isEmpty. Operand 69257 states and 86156 transitions. [2021-11-23 17:15:26,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:15:26,893 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:26,893 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 17:15:26,907 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (99)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:27,095 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (100)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:27,489 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Ended with exit code 0 [2021-11-23 17:15:27,493 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:15:27,494 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:27,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:27,494 INFO L85 PathProgramCache]: Analyzing trace with hash -959943598, now seen corresponding path program 1 times [2021-11-23 17:15:27,495 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:27,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1479438148] [2021-11-23 17:15:27,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:27,495 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:27,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:27,509 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:27,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Waiting until timeout for monitored process [2021-11-23 17:15:27,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:27,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 17:15:27,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:34,365 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 17:15:34,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:37,362 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 17:15:37,363 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:37,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1479438148] [2021-11-23 17:15:37,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1479438148] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:37,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1715726373] [2021-11-23 17:15:37,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:37,364 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:37,364 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:15:37,364 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:15:37,366 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Waiting until timeout for monitored process [2021-11-23 17:15:37,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:37,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:15:37,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:46,374 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 17:15:46,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:49,833 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 17:15:49,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1715726373] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:49,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [929935935] [2021-11-23 17:15:49,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:49,834 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:15:49,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:15:49,835 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:15:49,837 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2021-11-23 17:15:49,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:49,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:15:49,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:57,026 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 17:15:57,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:59,935 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 17:15:59,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [929935935] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:59,935 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:15:59,935 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21, 28, 26, 18, 18] total 97 [2021-11-23 17:15:59,936 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495525410] [2021-11-23 17:15:59,936 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:15:59,936 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-23 17:15:59,936 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:59,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-23 17:15:59,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=731, Invalid=8581, Unknown=0, NotChecked=0, Total=9312 [2021-11-23 17:15:59,938 INFO L87 Difference]: Start difference. First operand 69257 states and 86156 transitions. Second operand has 97 states, 97 states have (on average 4.865979381443299) internal successors, (472), 97 states have internal predecessors, (472), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:11,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:11,575 INFO L93 Difference]: Finished difference Result 78239 states and 97614 transitions. [2021-11-23 17:16:11,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-23 17:16:11,575 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 4.865979381443299) internal successors, (472), 97 states have internal predecessors, (472), 0 states have call successors, (0), 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 17:16:11,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:11,673 INFO L225 Difference]: With dead ends: 78239 [2021-11-23 17:16:11,673 INFO L226 Difference]: Without dead ends: 69215 [2021-11-23 17:16:11,690 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 703 GetRequests, 587 SyntacticMatches, 2 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5418 ImplicationChecksByTransitivity, 18.4s TimeCoverageRelationStatistics Valid=1085, Invalid=12255, Unknown=0, NotChecked=0, Total=13340 [2021-11-23 17:16:11,690 INFO L933 BasicCegarLoop]: 1529 mSDtfsCounter, 1793 mSDsluCounter, 56027 mSDsCounter, 0 mSdLazyCounter, 354 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1793 SdHoareTripleChecker+Valid, 57556 SdHoareTripleChecker+Invalid, 833 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 473 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:11,691 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1793 Valid, 57556 Invalid, 833 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [6 Valid, 354 Invalid, 0 Unknown, 473 Unchecked, 0.6s Time] [2021-11-23 17:16:11,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69215 states. [2021-11-23 17:16:19,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69215 to 69215. [2021-11-23 17:16:19,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69215 states, 69213 states have (on average 1.2441015416179042) internal successors, (86108), 69214 states have internal predecessors, (86108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:19,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69215 states to 69215 states and 86108 transitions. [2021-11-23 17:16:19,722 INFO L78 Accepts]: Start accepts. Automaton has 69215 states and 86108 transitions. Word has length 113 [2021-11-23 17:16:19,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:19,723 INFO L470 AbstractCegarLoop]: Abstraction has 69215 states and 86108 transitions. [2021-11-23 17:16:19,723 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 4.865979381443299) internal successors, (472), 97 states have internal predecessors, (472), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:19,723 INFO L276 IsEmpty]: Start isEmpty. Operand 69215 states and 86108 transitions. [2021-11-23 17:16:19,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:16:19,725 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:19,725 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 17:16:19,751 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Ended with exit code 0 [2021-11-23 17:16:19,936 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Ended with exit code 0 [2021-11-23 17:16:20,128 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:20,326 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:20,327 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:20,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:20,327 INFO L85 PathProgramCache]: Analyzing trace with hash 449119195, now seen corresponding path program 1 times [2021-11-23 17:16:20,327 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:20,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [501631062] [2021-11-23 17:16:20,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:20,328 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:20,328 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:20,329 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:20,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57c7aeff-d5a8-4d5f-9579-5f8d5779cbe0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Waiting until timeout for monitored process [2021-11-23 17:16:20,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:20,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:16:20,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:21,003 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 17:16:21,003 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:21,003 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:21,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [501631062] [2021-11-23 17:16:21,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [501631062] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:21,004 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:21,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:16:21,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729967990] [2021-11-23 17:16:21,004 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:21,004 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:16:21,004 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:21,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:16:21,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:16:21,005 INFO L87 Difference]: Start difference. First operand 69215 states and 86108 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)