./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.5.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6a47aea7 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/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_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.5.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/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_cca63a99-2778-4c52-9454-f56d99158141/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 acd9e872db1fd43c4a46d62b416714fdbb0fdc4944c5c8838fbbff5e8b72009f --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:27:50,501 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:27:50,505 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:27:50,569 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:27:50,570 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:27:50,574 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:27:50,576 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:27:50,581 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:27:50,584 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:27:50,590 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:27:50,592 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:27:50,594 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:27:50,595 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:27:50,598 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:27:50,600 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:27:50,605 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:27:50,607 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:27:50,609 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:27:50,612 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:27:50,621 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:27:50,623 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:27:50,625 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:27:50,628 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:27:50,629 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:27:50,639 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:27:50,640 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:27:50,640 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:27:50,642 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:27:50,643 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:27:50,645 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:27:50,646 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:27:50,647 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:27:50,649 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:27:50,651 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:27:50,652 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:27:50,653 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:27:50,654 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:27:50,654 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:27:50,655 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:27:50,656 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:27:50,657 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:27:50,658 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:27:50,708 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:27:50,708 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:27:50,709 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:27:50,710 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:27:50,711 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:27:50,711 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:27:50,711 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:27:50,712 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:27:50,712 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:27:50,712 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:27:50,713 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:27:50,714 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:27:50,714 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:27:50,714 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:27:50,714 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:27:50,715 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:27:50,715 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:27:50,715 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:27:50,716 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:27:50,717 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:27:50,717 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:27:50,717 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:27:50,717 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:27:50,718 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:27:50,718 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:27:50,718 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:27:50,720 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:27:50,720 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:27:50,721 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:27:50,721 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:27:50,721 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:27:50,722 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:27:50,722 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:27:50,722 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:27:50,722 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:27:50,723 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:27:50,723 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:27:50,723 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:27:50,723 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:27:50,724 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:27:50,724 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:27:50,724 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_cca63a99-2778-4c52-9454-f56d99158141/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> acd9e872db1fd43c4a46d62b416714fdbb0fdc4944c5c8838fbbff5e8b72009f [2021-11-23 17:27:51,087 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:27:51,122 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:27:51,126 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:27:51,128 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:27:51,129 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:27:51,131 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.5.ufo.UNBOUNDED.pals.c [2021-11-23 17:27:51,225 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/data/d244361b5/ed55021db44b472ebcf3fca60146fde9/FLAGf280c9cdf [2021-11-23 17:27:51,884 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:27:51,884 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/sv-benchmarks/c/seq-mthreaded/pals_lcr.5.ufo.UNBOUNDED.pals.c [2021-11-23 17:27:51,903 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/data/d244361b5/ed55021db44b472ebcf3fca60146fde9/FLAGf280c9cdf [2021-11-23 17:27:52,197 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/data/d244361b5/ed55021db44b472ebcf3fca60146fde9 [2021-11-23 17:27:52,199 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:27:52,200 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:27:52,202 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:27:52,202 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:27:52,208 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:27:52,209 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:27:52" (1/1) ... [2021-11-23 17:27:52,212 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@727dfc18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:52, skipping insertion in model container [2021-11-23 17:27:52,213 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:27:52" (1/1) ... [2021-11-23 17:27:52,222 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:27:52,285 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:27:52,576 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_cca63a99-2778-4c52-9454-f56d99158141/sv-benchmarks/c/seq-mthreaded/pals_lcr.5.ufo.UNBOUNDED.pals.c[11261,11274] [2021-11-23 17:27:52,579 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:27:52,593 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:27:52,650 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/sv-benchmarks/c/seq-mthreaded/pals_lcr.5.ufo.UNBOUNDED.pals.c[11261,11274] [2021-11-23 17:27:52,651 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:27:52,669 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:27:52,669 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:52 WrapperNode [2021-11-23 17:27:52,669 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:27:52,671 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:27:52,671 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:27:52,671 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:27:52,680 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:52" (1/1) ... [2021-11-23 17:27:52,692 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:52" (1/1) ... [2021-11-23 17:27:52,727 INFO L137 Inliner]: procedures = 25, calls = 16, calls flagged for inlining = 11, calls inlined = 11, statements flattened = 331 [2021-11-23 17:27:52,728 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:27:52,728 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:27:52,729 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:27:52,729 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:27:52,739 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:52" (1/1) ... [2021-11-23 17:27:52,739 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:52" (1/1) ... [2021-11-23 17:27:52,744 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:52" (1/1) ... [2021-11-23 17:27:52,745 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:52" (1/1) ... [2021-11-23 17:27:52,754 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:52" (1/1) ... [2021-11-23 17:27:52,762 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:52" (1/1) ... [2021-11-23 17:27:52,765 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:52" (1/1) ... [2021-11-23 17:27:52,770 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:27:52,771 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:27:52,772 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:27:52,772 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:27:52,782 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:52" (1/1) ... [2021-11-23 17:27:52,809 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:27:52,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:27:52,847 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:27:52,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:27:52,900 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:27:52,901 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:27:52,901 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:27:52,902 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:27:53,040 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:27:53,042 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:27:53,681 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:27:53,725 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 17:27:53,731 INFO L158 Benchmark]: Toolchain (without parser) took 1528.99ms. Allocated memory was 90.2MB in the beginning and 109.1MB in the end (delta: 18.9MB). Free memory was 53.2MB in the beginning and 52.6MB in the end (delta: 637.2kB). Peak memory consumption was 18.5MB. Max. memory is 16.1GB. [2021-11-23 17:27:53,731 INFO L158 Benchmark]: CDTParser took 0.35ms. Allocated memory is still 90.2MB. Free memory is still 70.0MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:27:53,733 INFO L158 Benchmark]: CACSL2BoogieTranslator took 467.84ms. Allocated memory was 90.2MB in the beginning and 109.1MB in the end (delta: 18.9MB). Free memory was 53.1MB in the beginning and 81.1MB in the end (delta: -28.1MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2021-11-23 17:27:53,734 INFO L158 Benchmark]: Boogie Procedure Inliner took 56.94ms. Allocated memory is still 109.1MB. Free memory was 81.1MB in the beginning and 78.6MB in the end (delta: 2.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:27:53,735 INFO L158 Benchmark]: Boogie Preprocessor took 41.94ms. Allocated memory is still 109.1MB. Free memory was 78.6MB in the beginning and 76.9MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:27:53,736 INFO L158 Benchmark]: RCFGBuilder took 957.40ms. Allocated memory is still 109.1MB. Free memory was 76.9MB in the beginning and 52.6MB in the end (delta: 24.3MB). Peak memory consumption was 25.2MB. Max. memory is 16.1GB. [2021-11-23 17:27:53,739 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.35ms. Allocated memory is still 90.2MB. Free memory is still 70.0MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 467.84ms. Allocated memory was 90.2MB in the beginning and 109.1MB in the end (delta: 18.9MB). Free memory was 53.1MB in the beginning and 81.1MB in the end (delta: -28.1MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 56.94ms. Allocated memory is still 109.1MB. Free memory was 81.1MB in the beginning and 78.6MB in the end (delta: 2.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 41.94ms. Allocated memory is still 109.1MB. Free memory was 78.6MB in the beginning and 76.9MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 957.40ms. Allocated memory is still 109.1MB. Free memory was 76.9MB in the beginning and 52.6MB in the end (delta: 24.3MB). Peak memory consumption was 25.2MB. 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 17:27:53,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/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_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/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_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.5.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/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_cca63a99-2778-4c52-9454-f56d99158141/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 acd9e872db1fd43c4a46d62b416714fdbb0fdc4944c5c8838fbbff5e8b72009f --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:27:56,645 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:27:56,649 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:27:56,716 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:27:56,716 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:27:56,722 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:27:56,724 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:27:56,729 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:27:56,732 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:27:56,741 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:27:56,742 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:27:56,744 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:27:56,745 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:27:56,747 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:27:56,750 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:27:56,754 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:27:56,756 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:27:56,757 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:27:56,760 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:27:56,764 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:27:56,766 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:27:56,768 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:27:56,770 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:27:56,771 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:27:56,775 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:27:56,776 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:27:56,776 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:27:56,777 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:27:56,778 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:27:56,780 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:27:56,780 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:27:56,781 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:27:56,782 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:27:56,784 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:27:56,785 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:27:56,786 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:27:56,787 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:27:56,787 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:27:56,788 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:27:56,789 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:27:56,791 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:27:56,792 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:27:56,821 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:27:56,821 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:27:56,824 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:27:56,825 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:27:56,825 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:27:56,826 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:27:56,826 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:27:56,827 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:27:56,827 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:27:56,827 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:27:56,828 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:27:56,829 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:27:56,830 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:27:56,830 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:27:56,830 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:27:56,831 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:27:56,831 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:27:56,831 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:27:56,831 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:27:56,832 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:27:56,832 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:27:56,832 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:27:56,832 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:27:56,833 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:27:56,833 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:27:56,833 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:27:56,834 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:27:56,834 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:27:56,834 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:27:56,834 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:27:56,835 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:27:56,835 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:27:56,835 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:27:56,836 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:27:56,836 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:27:56,836 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:27:56,836 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:27:56,837 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:27:56,837 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_cca63a99-2778-4c52-9454-f56d99158141/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> acd9e872db1fd43c4a46d62b416714fdbb0fdc4944c5c8838fbbff5e8b72009f [2021-11-23 17:27:57,276 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:27:57,309 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:27:57,312 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:27:57,314 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:27:57,315 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:27:57,317 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.5.ufo.UNBOUNDED.pals.c [2021-11-23 17:27:57,399 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/data/a10a20e96/a3eac2b8d3ae4819874c09cf208e624c/FLAGbfb0c2c9e [2021-11-23 17:27:58,062 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:27:58,063 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/sv-benchmarks/c/seq-mthreaded/pals_lcr.5.ufo.UNBOUNDED.pals.c [2021-11-23 17:27:58,079 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/data/a10a20e96/a3eac2b8d3ae4819874c09cf208e624c/FLAGbfb0c2c9e [2021-11-23 17:27:58,358 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/data/a10a20e96/a3eac2b8d3ae4819874c09cf208e624c [2021-11-23 17:27:58,363 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:27:58,364 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:27:58,383 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:27:58,389 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:27:58,393 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:27:58,394 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:27:58" (1/1) ... [2021-11-23 17:27:58,395 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7825d64f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:58, skipping insertion in model container [2021-11-23 17:27:58,396 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:27:58" (1/1) ... [2021-11-23 17:27:58,421 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:27:58,476 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:27:58,758 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_cca63a99-2778-4c52-9454-f56d99158141/sv-benchmarks/c/seq-mthreaded/pals_lcr.5.ufo.UNBOUNDED.pals.c[11261,11274] [2021-11-23 17:27:58,761 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:27:58,787 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:27:58,869 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_cca63a99-2778-4c52-9454-f56d99158141/sv-benchmarks/c/seq-mthreaded/pals_lcr.5.ufo.UNBOUNDED.pals.c[11261,11274] [2021-11-23 17:27:58,874 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:27:58,900 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:27:58,900 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:58 WrapperNode [2021-11-23 17:27:58,901 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:27:58,903 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:27:58,903 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:27:58,903 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:27:58,912 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:58" (1/1) ... [2021-11-23 17:27:58,940 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:58" (1/1) ... [2021-11-23 17:27:58,985 INFO L137 Inliner]: procedures = 25, calls = 16, calls flagged for inlining = 11, calls inlined = 11, statements flattened = 314 [2021-11-23 17:27:58,985 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:27:58,986 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:27:58,986 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:27:58,986 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:27:58,998 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:58" (1/1) ... [2021-11-23 17:27:58,999 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:58" (1/1) ... [2021-11-23 17:27:59,019 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:58" (1/1) ... [2021-11-23 17:27:59,020 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:58" (1/1) ... [2021-11-23 17:27:59,046 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:58" (1/1) ... [2021-11-23 17:27:59,053 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:58" (1/1) ... [2021-11-23 17:27:59,059 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:58" (1/1) ... [2021-11-23 17:27:59,068 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:27:59,069 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:27:59,069 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:27:59,069 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:27:59,070 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:58" (1/1) ... [2021-11-23 17:27:59,078 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:27:59,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:27:59,117 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:27:59,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:27:59,161 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:27:59,161 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:27:59,161 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:27:59,161 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:27:59,259 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:27:59,261 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:27:59,915 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:27:59,925 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:27:59,932 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 17:27:59,935 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:27:59 BoogieIcfgContainer [2021-11-23 17:27:59,935 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:27:59,937 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:27:59,937 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:27:59,943 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:27:59,944 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:27:58" (1/3) ... [2021-11-23 17:27:59,945 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e1fed31 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:27:59, skipping insertion in model container [2021-11-23 17:27:59,946 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:27:58" (2/3) ... [2021-11-23 17:27:59,946 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e1fed31 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:27:59, skipping insertion in model container [2021-11-23 17:27:59,947 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:27:59" (3/3) ... [2021-11-23 17:27:59,948 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.5.ufo.UNBOUNDED.pals.c [2021-11-23 17:27:59,956 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:27:59,957 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 17:28:00,027 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:28:00,043 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 17:28:00,043 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 17:28:00,082 INFO L276 IsEmpty]: Start isEmpty. Operand has 95 states, 93 states have (on average 1.7204301075268817) internal successors, (160), 94 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:00,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 17:28:00,093 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:00,094 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] [2021-11-23 17:28:00,095 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:00,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:00,101 INFO L85 PathProgramCache]: Analyzing trace with hash -176333024, now seen corresponding path program 1 times [2021-11-23 17:28:00,117 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:00,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1652681641] [2021-11-23 17:28:00,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:00,118 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:00,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:00,124 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:00,177 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:28:00,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:00,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 17:28:00,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:00,415 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 17:28:00,416 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:00,417 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:00,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1652681641] [2021-11-23 17:28:00,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1652681641] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:00,419 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:00,419 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:28:00,421 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659898772] [2021-11-23 17:28:00,424 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:00,429 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 17:28:00,429 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:00,492 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 17:28:00,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:28:00,497 INFO L87 Difference]: Start difference. First operand has 95 states, 93 states have (on average 1.7204301075268817) internal successors, (160), 94 states have internal predecessors, (160), 0 states have call successors, (0), 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 16.5) internal successors, (33), 2 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:00,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:00,541 INFO L93 Difference]: Finished difference Result 150 states and 249 transitions. [2021-11-23 17:28:00,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 17:28:00,544 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 16.5) internal successors, (33), 2 states have internal predecessors, (33), 0 states have call successors, (0), 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 33 [2021-11-23 17:28:00,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:00,558 INFO L225 Difference]: With dead ends: 150 [2021-11-23 17:28:00,558 INFO L226 Difference]: Without dead ends: 91 [2021-11-23 17:28:00,561 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 32 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 17:28:00,566 INFO L933 BasicCegarLoop]: 153 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, 153 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 17:28:00,568 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:00,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-23 17:28:00,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2021-11-23 17:28:00,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.7) internal successors, (153), 90 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:00,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 153 transitions. [2021-11-23 17:28:00,629 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 153 transitions. Word has length 33 [2021-11-23 17:28:00,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:00,630 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 153 transitions. [2021-11-23 17:28:00,630 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 16.5) internal successors, (33), 2 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:00,630 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 153 transitions. [2021-11-23 17:28:00,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 17:28:00,635 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:00,636 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] [2021-11-23 17:28:00,654 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:00,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:00,848 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:00,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:00,849 INFO L85 PathProgramCache]: Analyzing trace with hash -685806114, now seen corresponding path program 1 times [2021-11-23 17:28:00,849 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:00,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2103787440] [2021-11-23 17:28:00,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:00,850 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:00,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:00,851 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:00,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:28:00,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:00,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:28:00,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:01,027 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 17:28:01,027 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:01,028 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:01,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2103787440] [2021-11-23 17:28:01,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2103787440] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:01,028 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:01,029 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:28:01,029 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312811845] [2021-11-23 17:28:01,029 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:01,031 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:28:01,031 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:01,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:28:01,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:28:01,033 INFO L87 Difference]: Start difference. First operand 91 states and 153 transitions. Second operand has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:01,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:01,166 INFO L93 Difference]: Finished difference Result 149 states and 242 transitions. [2021-11-23 17:28:01,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:28:01,167 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 0 states have call successors, (0), 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 33 [2021-11-23 17:28:01,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:01,168 INFO L225 Difference]: With dead ends: 149 [2021-11-23 17:28:01,169 INFO L226 Difference]: Without dead ends: 91 [2021-11-23 17:28:01,169 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:01,171 INFO L933 BasicCegarLoop]: 151 mSDtfsCounter, 3 mSDsluCounter, 419 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 570 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:01,172 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 570 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:28:01,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-23 17:28:01,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2021-11-23 17:28:01,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.3555555555555556) internal successors, (122), 90 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:01,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 122 transitions. [2021-11-23 17:28:01,181 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 122 transitions. Word has length 33 [2021-11-23 17:28:01,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:01,181 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 122 transitions. [2021-11-23 17:28:01,182 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:01,182 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 122 transitions. [2021-11-23 17:28:01,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:28:01,184 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:01,185 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:01,199 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-11-23 17:28:01,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:01,396 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:01,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:01,397 INFO L85 PathProgramCache]: Analyzing trace with hash 803903125, now seen corresponding path program 1 times [2021-11-23 17:28:01,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:01,398 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1918266610] [2021-11-23 17:28:01,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:01,398 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:01,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:01,400 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:01,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:28:01,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:01,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:28:01,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:01,723 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 17:28:01,723 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:01,724 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:01,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1918266610] [2021-11-23 17:28:01,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1918266610] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:01,725 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:01,726 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:28:01,729 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490306060] [2021-11-23 17:28:01,730 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:01,731 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:01,731 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:01,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:01,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:01,733 INFO L87 Difference]: Start difference. First operand 91 states and 122 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 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 17:28:01,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:01,766 INFO L93 Difference]: Finished difference Result 193 states and 282 transitions. [2021-11-23 17:28:01,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:01,767 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2021-11-23 17:28:01,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:01,773 INFO L225 Difference]: With dead ends: 193 [2021-11-23 17:28:01,774 INFO L226 Difference]: Without dead ends: 139 [2021-11-23 17:28:01,775 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:01,778 INFO L933 BasicCegarLoop]: 177 mSDtfsCounter, 71 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 264 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 17:28:01,780 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 264 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:01,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-11-23 17:28:01,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 137. [2021-11-23 17:28:01,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 136 states have (on average 1.4338235294117647) internal successors, (195), 136 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:01,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 195 transitions. [2021-11-23 17:28:01,812 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 195 transitions. Word has length 63 [2021-11-23 17:28:01,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:01,813 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 195 transitions. [2021-11-23 17:28:01,813 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 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 17:28:01,813 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 195 transitions. [2021-11-23 17:28:01,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:28:01,815 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:01,815 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:01,827 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:02,022 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:02,022 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:02,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:02,023 INFO L85 PathProgramCache]: Analyzing trace with hash -1136127733, now seen corresponding path program 1 times [2021-11-23 17:28:02,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:02,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1107361859] [2021-11-23 17:28:02,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:02,025 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:02,025 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:02,026 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:02,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:28:02,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:02,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:28:02,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:02,291 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 17:28:02,291 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:02,292 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:02,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1107361859] [2021-11-23 17:28:02,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1107361859] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:02,292 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:02,292 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:28:02,293 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206099042] [2021-11-23 17:28:02,293 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:02,293 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:02,293 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:02,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:02,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:02,295 INFO L87 Difference]: Start difference. First operand 137 states and 195 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 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 17:28:02,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:02,315 INFO L93 Difference]: Finished difference Result 325 states and 491 transitions. [2021-11-23 17:28:02,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:02,316 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2021-11-23 17:28:02,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:02,318 INFO L225 Difference]: With dead ends: 325 [2021-11-23 17:28:02,318 INFO L226 Difference]: Without dead ends: 225 [2021-11-23 17:28:02,319 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:02,321 INFO L933 BasicCegarLoop]: 172 mSDtfsCounter, 67 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 263 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 17:28:02,321 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 263 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:02,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2021-11-23 17:28:02,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 223. [2021-11-23 17:28:02,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 222 states have (on average 1.4864864864864864) internal successors, (330), 222 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:02,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 330 transitions. [2021-11-23 17:28:02,337 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 330 transitions. Word has length 63 [2021-11-23 17:28:02,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:02,338 INFO L470 AbstractCegarLoop]: Abstraction has 223 states and 330 transitions. [2021-11-23 17:28:02,338 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 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 17:28:02,338 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 330 transitions. [2021-11-23 17:28:02,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:28:02,340 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:02,340 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:02,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:02,551 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:02,551 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:02,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:02,552 INFO L85 PathProgramCache]: Analyzing trace with hash 1564554881, now seen corresponding path program 1 times [2021-11-23 17:28:02,552 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:02,553 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [938617741] [2021-11-23 17:28:02,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:02,553 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:02,553 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:02,554 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:02,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:28:02,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:02,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:28:02,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:03,713 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 17:28:03,714 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:03,714 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:03,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [938617741] [2021-11-23 17:28:03,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [938617741] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:03,715 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:03,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:28:03,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685028089] [2021-11-23 17:28:03,716 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:03,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:28:03,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:03,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:28:03,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:03,717 INFO L87 Difference]: Start difference. First operand 223 states and 330 transitions. Second operand has 7 states, 7 states have (on average 9.0) internal successors, (63), 7 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 17:28:03,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:03,991 INFO L93 Difference]: Finished difference Result 1339 states and 2088 transitions. [2021-11-23 17:28:03,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:28:03,992 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 9.0) internal successors, (63), 7 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2021-11-23 17:28:03,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:04,002 INFO L225 Difference]: With dead ends: 1339 [2021-11-23 17:28:04,002 INFO L226 Difference]: Without dead ends: 1153 [2021-11-23 17:28:04,005 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:04,006 INFO L933 BasicCegarLoop]: 116 mSDtfsCounter, 753 mSDsluCounter, 476 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 753 SdHoareTripleChecker+Valid, 592 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:04,007 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [753 Valid, 592 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 17:28:04,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1153 states. [2021-11-23 17:28:04,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1153 to 591. [2021-11-23 17:28:04,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 591 states, 590 states have (on average 1.528813559322034) internal successors, (902), 590 states have internal predecessors, (902), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:04,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 591 states to 591 states and 902 transitions. [2021-11-23 17:28:04,076 INFO L78 Accepts]: Start accepts. Automaton has 591 states and 902 transitions. Word has length 63 [2021-11-23 17:28:04,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:04,079 INFO L470 AbstractCegarLoop]: Abstraction has 591 states and 902 transitions. [2021-11-23 17:28:04,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 9.0) internal successors, (63), 7 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 17:28:04,079 INFO L276 IsEmpty]: Start isEmpty. Operand 591 states and 902 transitions. [2021-11-23 17:28:04,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 17:28:04,089 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:04,089 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:04,106 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:04,306 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:04,307 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:04,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:04,308 INFO L85 PathProgramCache]: Analyzing trace with hash -1117008495, now seen corresponding path program 1 times [2021-11-23 17:28:04,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:04,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [294395348] [2021-11-23 17:28:04,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:04,309 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:04,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:04,310 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:04,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:28:04,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:04,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:28:04,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:04,585 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 17:28:04,586 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:04,586 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:04,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [294395348] [2021-11-23 17:28:04,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [294395348] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:04,587 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:04,587 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:28:04,587 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376545535] [2021-11-23 17:28:04,587 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:04,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:04,588 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:04,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:04,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:04,589 INFO L87 Difference]: Start difference. First operand 591 states and 902 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 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 17:28:04,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:04,654 INFO L93 Difference]: Finished difference Result 1635 states and 2520 transitions. [2021-11-23 17:28:04,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:04,654 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 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 65 [2021-11-23 17:28:04,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:04,661 INFO L225 Difference]: With dead ends: 1635 [2021-11-23 17:28:04,662 INFO L226 Difference]: Without dead ends: 1081 [2021-11-23 17:28:04,663 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:04,664 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 50 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:04,665 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 196 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:04,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1081 states. [2021-11-23 17:28:04,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1081 to 1067. [2021-11-23 17:28:04,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1067 states, 1066 states have (on average 1.5103189493433395) internal successors, (1610), 1066 states have internal predecessors, (1610), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:04,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1067 states to 1067 states and 1610 transitions. [2021-11-23 17:28:04,732 INFO L78 Accepts]: Start accepts. Automaton has 1067 states and 1610 transitions. Word has length 65 [2021-11-23 17:28:04,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:04,733 INFO L470 AbstractCegarLoop]: Abstraction has 1067 states and 1610 transitions. [2021-11-23 17:28:04,733 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 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 17:28:04,733 INFO L276 IsEmpty]: Start isEmpty. Operand 1067 states and 1610 transitions. [2021-11-23 17:28:04,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 17:28:04,735 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:04,735 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:04,752 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Ended with exit code 0 [2021-11-23 17:28:04,946 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:04,946 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:04,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:04,947 INFO L85 PathProgramCache]: Analyzing trace with hash 738399093, now seen corresponding path program 1 times [2021-11-23 17:28:04,947 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:04,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [797484684] [2021-11-23 17:28:04,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:04,948 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:04,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:04,949 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:04,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:28:05,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:05,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:28:05,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:05,178 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 17:28:05,179 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:05,181 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:05,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [797484684] [2021-11-23 17:28:05,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [797484684] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:05,181 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:05,182 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:28:05,182 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1064672048] [2021-11-23 17:28:05,182 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:05,183 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:05,183 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:05,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:05,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:05,184 INFO L87 Difference]: Start difference. First operand 1067 states and 1610 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 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 17:28:05,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:05,280 INFO L93 Difference]: Finished difference Result 2983 states and 4516 transitions. [2021-11-23 17:28:05,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:05,281 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 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 65 [2021-11-23 17:28:05,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:05,295 INFO L225 Difference]: With dead ends: 2983 [2021-11-23 17:28:05,297 INFO L226 Difference]: Without dead ends: 1953 [2021-11-23 17:28:05,299 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:05,301 INFO L933 BasicCegarLoop]: 155 mSDtfsCounter, 59 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 254 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 17:28:05,301 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 254 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:05,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1953 states. [2021-11-23 17:28:05,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1953 to 1951. [2021-11-23 17:28:05,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1951 states, 1950 states have (on average 1.4964102564102564) internal successors, (2918), 1950 states have internal predecessors, (2918), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:05,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1951 states to 1951 states and 2918 transitions. [2021-11-23 17:28:05,435 INFO L78 Accepts]: Start accepts. Automaton has 1951 states and 2918 transitions. Word has length 65 [2021-11-23 17:28:05,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:05,438 INFO L470 AbstractCegarLoop]: Abstraction has 1951 states and 2918 transitions. [2021-11-23 17:28:05,438 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 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 17:28:05,439 INFO L276 IsEmpty]: Start isEmpty. Operand 1951 states and 2918 transitions. [2021-11-23 17:28:05,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 17:28:05,439 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:05,440 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:05,460 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:05,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:05,657 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:05,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:05,658 INFO L85 PathProgramCache]: Analyzing trace with hash 1985906709, now seen corresponding path program 1 times [2021-11-23 17:28:05,658 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:05,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1794639208] [2021-11-23 17:28:05,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:05,659 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:05,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:05,660 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:05,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:28:05,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:05,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:28:05,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:05,881 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 17:28:05,881 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:05,881 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:05,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1794639208] [2021-11-23 17:28:05,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1794639208] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:05,882 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:05,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:28:05,882 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022063019] [2021-11-23 17:28:05,882 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:05,883 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:05,883 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:05,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:05,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:05,884 INFO L87 Difference]: Start difference. First operand 1951 states and 2918 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 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 17:28:06,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:06,058 INFO L93 Difference]: Finished difference Result 5491 states and 8200 transitions. [2021-11-23 17:28:06,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:06,059 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 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 65 [2021-11-23 17:28:06,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:06,081 INFO L225 Difference]: With dead ends: 5491 [2021-11-23 17:28:06,082 INFO L226 Difference]: Without dead ends: 3577 [2021-11-23 17:28:06,085 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:06,086 INFO L933 BasicCegarLoop]: 168 mSDtfsCounter, 63 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 263 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 17:28:06,086 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 263 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:06,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3577 states. [2021-11-23 17:28:06,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3577 to 3575. [2021-11-23 17:28:06,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3575 states, 3574 states have (on average 1.4745383324006716) internal successors, (5270), 3574 states have internal predecessors, (5270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:06,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3575 states to 3575 states and 5270 transitions. [2021-11-23 17:28:06,319 INFO L78 Accepts]: Start accepts. Automaton has 3575 states and 5270 transitions. Word has length 65 [2021-11-23 17:28:06,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:06,320 INFO L470 AbstractCegarLoop]: Abstraction has 3575 states and 5270 transitions. [2021-11-23 17:28:06,320 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 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 17:28:06,320 INFO L276 IsEmpty]: Start isEmpty. Operand 3575 states and 5270 transitions. [2021-11-23 17:28:06,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 17:28:06,321 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:06,321 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:06,337 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:06,532 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:06,532 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:06,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:06,533 INFO L85 PathProgramCache]: Analyzing trace with hash 1379050855, now seen corresponding path program 1 times [2021-11-23 17:28:06,533 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:06,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [585961687] [2021-11-23 17:28:06,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:06,533 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:06,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:06,535 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:06,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:28:06,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:06,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:28:06,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:06,759 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 17:28:06,760 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:06,760 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:06,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [585961687] [2021-11-23 17:28:06,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [585961687] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:06,760 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:06,761 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:28:06,761 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677568834] [2021-11-23 17:28:06,761 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:06,762 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:28:06,762 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:06,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:28:06,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:28:06,763 INFO L87 Difference]: Start difference. First operand 3575 states and 5270 transitions. Second operand has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:07,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:07,185 INFO L93 Difference]: Finished difference Result 6426 states and 9390 transitions. [2021-11-23 17:28:07,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:28:07,186 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 0 states have call successors, (0), 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 17:28:07,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:07,223 INFO L225 Difference]: With dead ends: 6426 [2021-11-23 17:28:07,223 INFO L226 Difference]: Without dead ends: 6424 [2021-11-23 17:28:07,225 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:28:07,226 INFO L933 BasicCegarLoop]: 167 mSDtfsCounter, 225 mSDsluCounter, 368 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 535 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:07,226 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [225 Valid, 535 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:28:07,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6424 states. [2021-11-23 17:28:07,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6424 to 3767. [2021-11-23 17:28:07,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3767 states, 3766 states have (on average 1.446096654275093) internal successors, (5446), 3766 states have internal predecessors, (5446), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:07,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3767 states to 3767 states and 5446 transitions. [2021-11-23 17:28:07,537 INFO L78 Accepts]: Start accepts. Automaton has 3767 states and 5446 transitions. Word has length 66 [2021-11-23 17:28:07,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:07,537 INFO L470 AbstractCegarLoop]: Abstraction has 3767 states and 5446 transitions. [2021-11-23 17:28:07,537 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:07,538 INFO L276 IsEmpty]: Start isEmpty. Operand 3767 states and 5446 transitions. [2021-11-23 17:28:07,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 17:28:07,539 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:07,539 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:07,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:07,750 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:07,750 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:07,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:07,751 INFO L85 PathProgramCache]: Analyzing trace with hash 1091422096, now seen corresponding path program 1 times [2021-11-23 17:28:07,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:07,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [10931585] [2021-11-23 17:28:07,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:07,752 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:07,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:07,753 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:07,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:28:07,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:07,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:28:07,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:07,982 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:07,982 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:07,983 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:07,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [10931585] [2021-11-23 17:28:07,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [10931585] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:07,983 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:07,983 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:28:07,984 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452006662] [2021-11-23 17:28:07,984 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:07,984 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:07,984 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:07,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:07,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:07,985 INFO L87 Difference]: Start difference. First operand 3767 states and 5446 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:08,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:08,373 INFO L93 Difference]: Finished difference Result 7518 states and 10972 transitions. [2021-11-23 17:28:08,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:08,374 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 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 17:28:08,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:08,412 INFO L225 Difference]: With dead ends: 7518 [2021-11-23 17:28:08,412 INFO L226 Difference]: Without dead ends: 5451 [2021-11-23 17:28:08,416 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:08,417 INFO L933 BasicCegarLoop]: 186 mSDtfsCounter, 72 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 269 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 17:28:08,418 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 269 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:08,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5451 states. [2021-11-23 17:28:08,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5451 to 5449. [2021-11-23 17:28:08,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5449 states, 5448 states have (on average 1.4405286343612336) internal successors, (7848), 5448 states have internal predecessors, (7848), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:08,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5449 states to 5449 states and 7848 transitions. [2021-11-23 17:28:08,853 INFO L78 Accepts]: Start accepts. Automaton has 5449 states and 7848 transitions. Word has length 67 [2021-11-23 17:28:08,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:08,854 INFO L470 AbstractCegarLoop]: Abstraction has 5449 states and 7848 transitions. [2021-11-23 17:28:08,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:08,854 INFO L276 IsEmpty]: Start isEmpty. Operand 5449 states and 7848 transitions. [2021-11-23 17:28:08,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 17:28:08,858 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:08,859 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:08,872 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:09,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:09,072 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:09,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:09,073 INFO L85 PathProgramCache]: Analyzing trace with hash 291374621, now seen corresponding path program 1 times [2021-11-23 17:28:09,074 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:09,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [719653103] [2021-11-23 17:28:09,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:09,075 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:09,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:09,076 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:09,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 17:28:09,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:09,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:28:09,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:09,454 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:09,455 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:09,455 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:09,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [719653103] [2021-11-23 17:28:09,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [719653103] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:09,455 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:09,456 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:28:09,456 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374457403] [2021-11-23 17:28:09,456 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:09,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:09,457 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:09,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:09,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:09,458 INFO L87 Difference]: Start difference. First operand 5449 states and 7848 transitions. Second operand has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:09,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:09,787 INFO L93 Difference]: Finished difference Result 9227 states and 13358 transitions. [2021-11-23 17:28:09,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:09,788 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 0 states have call successors, (0), 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 94 [2021-11-23 17:28:09,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:09,815 INFO L225 Difference]: With dead ends: 9227 [2021-11-23 17:28:09,816 INFO L226 Difference]: Without dead ends: 3817 [2021-11-23 17:28:09,823 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:09,824 INFO L933 BasicCegarLoop]: 162 mSDtfsCounter, 54 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:09,825 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 268 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:09,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3817 states. [2021-11-23 17:28:10,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3817 to 3815. [2021-11-23 17:28:10,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3815 states, 3814 states have (on average 1.441793392763503) internal successors, (5499), 3814 states have internal predecessors, (5499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:10,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3815 states to 3815 states and 5499 transitions. [2021-11-23 17:28:10,182 INFO L78 Accepts]: Start accepts. Automaton has 3815 states and 5499 transitions. Word has length 94 [2021-11-23 17:28:10,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:10,182 INFO L470 AbstractCegarLoop]: Abstraction has 3815 states and 5499 transitions. [2021-11-23 17:28:10,183 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:10,183 INFO L276 IsEmpty]: Start isEmpty. Operand 3815 states and 5499 transitions. [2021-11-23 17:28:10,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 17:28:10,187 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:10,187 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:10,206 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:10,406 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:10,407 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:10,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:10,408 INFO L85 PathProgramCache]: Analyzing trace with hash 1785850050, now seen corresponding path program 1 times [2021-11-23 17:28:10,408 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:10,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1312714725] [2021-11-23 17:28:10,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:10,409 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:10,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:10,411 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:10,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 17:28:10,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:10,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:10,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:11,844 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:11,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:12,790 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:12,791 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:12,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1312714725] [2021-11-23 17:28:12,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1312714725] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:12,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [868469833] [2021-11-23 17:28:12,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:12,792 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:12,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:28:12,795 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:28:12,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-23 17:28:12,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:12,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:28:12,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:13,177 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:13,177 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:13,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [868469833] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:13,178 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:28:13,178 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 17:28:13,179 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000114620] [2021-11-23 17:28:13,179 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:13,179 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:13,180 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:13,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:13,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:28:13,181 INFO L87 Difference]: Start difference. First operand 3815 states and 5499 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:13,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:13,365 INFO L93 Difference]: Finished difference Result 5691 states and 8213 transitions. [2021-11-23 17:28:13,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:13,366 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 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 96 [2021-11-23 17:28:13,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:13,390 INFO L225 Difference]: With dead ends: 5691 [2021-11-23 17:28:13,396 INFO L226 Difference]: Without dead ends: 1945 [2021-11-23 17:28:13,402 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 270 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:28:13,404 INFO L933 BasicCegarLoop]: 149 mSDtfsCounter, 48 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 247 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 17:28:13,404 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 247 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:13,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1945 states. [2021-11-23 17:28:13,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1945 to 1943. [2021-11-23 17:28:13,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1943 states, 1942 states have (on average 1.4227600411946446) internal successors, (2763), 1942 states have internal predecessors, (2763), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:13,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1943 states to 1943 states and 2763 transitions. [2021-11-23 17:28:13,593 INFO L78 Accepts]: Start accepts. Automaton has 1943 states and 2763 transitions. Word has length 96 [2021-11-23 17:28:13,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:13,594 INFO L470 AbstractCegarLoop]: Abstraction has 1943 states and 2763 transitions. [2021-11-23 17:28:13,594 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:13,595 INFO L276 IsEmpty]: Start isEmpty. Operand 1943 states and 2763 transitions. [2021-11-23 17:28:13,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 17:28:13,597 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:13,597 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:13,607 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:13,814 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:13,999 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:14,000 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:14,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:14,000 INFO L85 PathProgramCache]: Analyzing trace with hash -710812212, now seen corresponding path program 1 times [2021-11-23 17:28:14,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:14,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1477479322] [2021-11-23 17:28:14,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:14,002 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:14,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:14,003 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:14,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 17:28:14,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:14,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:14,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:15,204 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:15,205 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:16,008 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:16,008 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:16,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1477479322] [2021-11-23 17:28:16,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1477479322] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:16,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1235557994] [2021-11-23 17:28:16,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:16,009 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:16,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:28:16,010 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:28:16,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 17:28:16,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:16,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:16,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:17,031 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:17,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:17,732 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:17,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1235557994] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:17,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1037384234] [2021-11-23 17:28:17,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:17,733 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:28:17,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:28:17,737 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:28:17,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 17:28:17,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:17,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:17,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:18,718 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:18,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:19,346 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:19,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1037384234] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:19,347 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:28:19,348 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:28:19,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230386737] [2021-11-23 17:28:19,348 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:28:19,350 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:28:19,350 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:19,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:28:19,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:28:19,351 INFO L87 Difference]: Start difference. First operand 1943 states and 2763 transitions. Second operand has 16 states, 16 states have (on average 10.4375) internal successors, (167), 15 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:19,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:19,618 INFO L93 Difference]: Finished difference Result 3848 states and 5488 transitions. [2021-11-23 17:28:19,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 17:28:19,619 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.4375) internal successors, (167), 15 states have internal predecessors, (167), 0 states have call successors, (0), 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 96 [2021-11-23 17:28:19,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:19,634 INFO L225 Difference]: With dead ends: 3848 [2021-11-23 17:28:19,641 INFO L226 Difference]: Without dead ends: 1974 [2021-11-23 17:28:19,644 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 573 GetRequests, 556 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:28:19,645 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 120 mSDsluCounter, 721 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 821 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 80 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:19,646 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [120 Valid, 821 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 48 Invalid, 0 Unknown, 80 Unchecked, 0.0s Time] [2021-11-23 17:28:19,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1974 states. [2021-11-23 17:28:19,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1974 to 1974. [2021-11-23 17:28:19,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1974 states, 1973 states have (on average 1.4181449569183984) internal successors, (2798), 1973 states have internal predecessors, (2798), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:19,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1974 states to 1974 states and 2798 transitions. [2021-11-23 17:28:19,776 INFO L78 Accepts]: Start accepts. Automaton has 1974 states and 2798 transitions. Word has length 96 [2021-11-23 17:28:19,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:19,776 INFO L470 AbstractCegarLoop]: Abstraction has 1974 states and 2798 transitions. [2021-11-23 17:28:19,786 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.4375) internal successors, (167), 15 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:19,795 INFO L276 IsEmpty]: Start isEmpty. Operand 1974 states and 2798 transitions. [2021-11-23 17:28:19,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 17:28:19,797 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:19,797 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:19,835 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:20,014 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:20,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:20,398 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:20,398 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:20,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:20,399 INFO L85 PathProgramCache]: Analyzing trace with hash 1508542914, now seen corresponding path program 1 times [2021-11-23 17:28:20,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:20,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [585454835] [2021-11-23 17:28:20,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:20,400 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:20,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:20,401 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:20,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 17:28:20,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:20,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:20,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:21,776 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:21,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:22,120 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:22,121 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:22,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [585454835] [2021-11-23 17:28:22,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [585454835] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:22,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [957409623] [2021-11-23 17:28:22,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:22,122 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:22,122 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:28:22,123 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:28:22,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-23 17:28:22,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:22,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:28:22,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:22,417 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:22,417 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:22,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [957409623] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:22,417 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:28:22,418 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 17:28:22,418 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086033204] [2021-11-23 17:28:22,418 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:22,419 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:22,419 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:22,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:22,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:28:22,420 INFO L87 Difference]: Start difference. First operand 1974 states and 2798 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:22,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:22,479 INFO L93 Difference]: Finished difference Result 2914 states and 4144 transitions. [2021-11-23 17:28:22,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:22,480 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 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 96 [2021-11-23 17:28:22,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:22,483 INFO L225 Difference]: With dead ends: 2914 [2021-11-23 17:28:22,483 INFO L226 Difference]: Without dead ends: 1040 [2021-11-23 17:28:22,486 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 270 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:28:22,487 INFO L933 BasicCegarLoop]: 142 mSDtfsCounter, 42 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 232 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 17:28:22,487 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 232 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:22,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1040 states. [2021-11-23 17:28:22,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1040 to 1038. [2021-11-23 17:28:22,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1038 states, 1037 states have (on average 1.390549662487946) internal successors, (1442), 1037 states have internal predecessors, (1442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:22,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1038 states to 1038 states and 1442 transitions. [2021-11-23 17:28:22,570 INFO L78 Accepts]: Start accepts. Automaton has 1038 states and 1442 transitions. Word has length 96 [2021-11-23 17:28:22,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:22,571 INFO L470 AbstractCegarLoop]: Abstraction has 1038 states and 1442 transitions. [2021-11-23 17:28:22,571 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:22,571 INFO L276 IsEmpty]: Start isEmpty. Operand 1038 states and 1442 transitions. [2021-11-23 17:28:22,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 17:28:22,573 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:22,573 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:22,588 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:22,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:22,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:22,985 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:22,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:22,985 INFO L85 PathProgramCache]: Analyzing trace with hash 290557516, now seen corresponding path program 1 times [2021-11-23 17:28:22,986 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:22,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [451303455] [2021-11-23 17:28:22,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:22,986 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:22,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:22,987 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:22,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 17:28:23,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:23,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:23,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:24,197 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:24,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:24,529 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:24,529 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:24,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [451303455] [2021-11-23 17:28:24,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [451303455] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:24,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [650771211] [2021-11-23 17:28:24,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:24,530 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:24,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:28:24,531 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:28:24,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-11-23 17:28:24,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:24,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:24,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:25,892 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:25,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:26,169 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:26,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [650771211] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:26,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110189728] [2021-11-23 17:28:26,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:26,170 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:28:26,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:28:26,171 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:28:26,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 17:28:26,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:26,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:26,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:27,494 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:27,494 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:27,764 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:27,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110189728] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:27,764 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:28:27,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:28:27,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851567263] [2021-11-23 17:28:27,765 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:28:27,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:28:27,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:27,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:28:27,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:28:27,767 INFO L87 Difference]: Start difference. First operand 1038 states and 1442 transitions. Second operand has 16 states, 16 states have (on average 10.8125) internal successors, (173), 15 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:28,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:28,066 INFO L93 Difference]: Finished difference Result 2014 states and 2823 transitions. [2021-11-23 17:28:28,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:28:28,067 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.8125) internal successors, (173), 15 states have internal predecessors, (173), 0 states have call successors, (0), 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 96 [2021-11-23 17:28:28,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:28,070 INFO L225 Difference]: With dead ends: 2014 [2021-11-23 17:28:28,070 INFO L226 Difference]: Without dead ends: 1076 [2021-11-23 17:28:28,072 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 574 GetRequests, 556 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:28:28,072 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 129 mSDsluCounter, 688 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 787 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 101 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:28,073 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 787 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 109 Invalid, 0 Unknown, 101 Unchecked, 0.1s Time] [2021-11-23 17:28:28,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1076 states. [2021-11-23 17:28:28,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1076 to 1048. [2021-11-23 17:28:28,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1048 states, 1047 states have (on average 1.390639923591213) internal successors, (1456), 1047 states have internal predecessors, (1456), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:28,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1048 states to 1048 states and 1456 transitions. [2021-11-23 17:28:28,155 INFO L78 Accepts]: Start accepts. Automaton has 1048 states and 1456 transitions. Word has length 96 [2021-11-23 17:28:28,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:28,156 INFO L470 AbstractCegarLoop]: Abstraction has 1048 states and 1456 transitions. [2021-11-23 17:28:28,156 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.8125) internal successors, (173), 15 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:28,156 INFO L276 IsEmpty]: Start isEmpty. Operand 1048 states and 1456 transitions. [2021-11-23 17:28:28,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 17:28:28,158 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:28,158 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:28,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:28,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:28,573 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Ended with exit code 0 [2021-11-23 17:28:28,766 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:28,767 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:28,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:28,767 INFO L85 PathProgramCache]: Analyzing trace with hash -1649473342, now seen corresponding path program 1 times [2021-11-23 17:28:28,767 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:28,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [955687952] [2021-11-23 17:28:28,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:28,768 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:28,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:28,770 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:28,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 17:28:28,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:28,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:28:28,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:29,016 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:29,017 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:29,017 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:29,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [955687952] [2021-11-23 17:28:29,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [955687952] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:29,017 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:29,017 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:28:29,018 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306619237] [2021-11-23 17:28:29,018 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:29,018 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:29,018 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:29,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:29,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:29,019 INFO L87 Difference]: Start difference. First operand 1048 states and 1456 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:29,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:29,061 INFO L93 Difference]: Finished difference Result 1520 states and 2124 transitions. [2021-11-23 17:28:29,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:29,061 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 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 96 [2021-11-23 17:28:29,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:29,063 INFO L225 Difference]: With dead ends: 1520 [2021-11-23 17:28:29,063 INFO L226 Difference]: Without dead ends: 582 [2021-11-23 17:28:29,064 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:29,065 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 30 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 229 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 17:28:29,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 229 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:29,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 582 states. [2021-11-23 17:28:29,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 582 to 580. [2021-11-23 17:28:29,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 580 states, 579 states have (on average 1.3506044905008636) internal successors, (782), 579 states have internal predecessors, (782), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:29,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 580 states to 580 states and 782 transitions. [2021-11-23 17:28:29,097 INFO L78 Accepts]: Start accepts. Automaton has 580 states and 782 transitions. Word has length 96 [2021-11-23 17:28:29,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:29,098 INFO L470 AbstractCegarLoop]: Abstraction has 580 states and 782 transitions. [2021-11-23 17:28:29,098 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:29,098 INFO L276 IsEmpty]: Start isEmpty. Operand 580 states and 782 transitions. [2021-11-23 17:28:29,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 17:28:29,099 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:29,100 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:29,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:29,311 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:29,312 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:29,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:29,312 INFO L85 PathProgramCache]: Analyzing trace with hash -287165490, now seen corresponding path program 1 times [2021-11-23 17:28:29,312 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:29,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [792038808] [2021-11-23 17:28:29,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:29,313 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:29,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:29,315 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:29,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:28:29,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:29,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:28:29,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:29,823 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:28:29,823 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:29,823 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:29,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [792038808] [2021-11-23 17:28:29,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [792038808] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:29,823 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:29,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:28:29,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656008110] [2021-11-23 17:28:29,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:29,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:28:29,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:29,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:28:29,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:28:29,825 INFO L87 Difference]: Start difference. First operand 580 states and 782 transitions. Second operand has 6 states, 6 states have (on average 15.5) internal successors, (93), 5 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:29,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:29,915 INFO L93 Difference]: Finished difference Result 1063 states and 1456 transitions. [2021-11-23 17:28:29,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:28:29,915 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.5) internal successors, (93), 5 states have internal predecessors, (93), 0 states have call successors, (0), 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 96 [2021-11-23 17:28:29,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:29,919 INFO L225 Difference]: With dead ends: 1063 [2021-11-23 17:28:29,920 INFO L226 Difference]: Without dead ends: 580 [2021-11-23 17:28:29,921 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:29,922 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 25 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 40 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:29,922 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 317 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 40 Unchecked, 0.0s Time] [2021-11-23 17:28:29,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2021-11-23 17:28:29,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 580. [2021-11-23 17:28:29,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 580 states, 579 states have (on average 1.3488773747841105) internal successors, (781), 579 states have internal predecessors, (781), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:29,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 580 states to 580 states and 781 transitions. [2021-11-23 17:28:29,956 INFO L78 Accepts]: Start accepts. Automaton has 580 states and 781 transitions. Word has length 96 [2021-11-23 17:28:29,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:29,956 INFO L470 AbstractCegarLoop]: Abstraction has 580 states and 781 transitions. [2021-11-23 17:28:29,956 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.5) internal successors, (93), 5 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:29,957 INFO L276 IsEmpty]: Start isEmpty. Operand 580 states and 781 transitions. [2021-11-23 17:28:29,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 17:28:29,958 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:29,958 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:29,970 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:30,169 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:30,169 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:30,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:30,170 INFO L85 PathProgramCache]: Analyzing trace with hash 182674126, now seen corresponding path program 1 times [2021-11-23 17:28:30,170 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:30,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2112254183] [2021-11-23 17:28:30,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:30,170 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:30,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:30,171 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:30,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 17:28:30,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:30,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:28:30,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:30,704 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:28:30,704 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:30,705 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:30,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2112254183] [2021-11-23 17:28:30,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2112254183] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:30,705 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:30,705 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:28:30,705 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919233569] [2021-11-23 17:28:30,705 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:30,705 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:28:30,706 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:30,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:28:30,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:28:30,706 INFO L87 Difference]: Start difference. First operand 580 states and 781 transitions. Second operand has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 5 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:30,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:30,797 INFO L93 Difference]: Finished difference Result 1067 states and 1460 transitions. [2021-11-23 17:28:30,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:28:30,797 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 5 states have internal predecessors, (92), 0 states have call successors, (0), 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 96 [2021-11-23 17:28:30,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:30,799 INFO L225 Difference]: With dead ends: 1067 [2021-11-23 17:28:30,800 INFO L226 Difference]: Without dead ends: 580 [2021-11-23 17:28:30,800 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:30,802 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 34 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 331 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:30,803 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 331 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 46 Invalid, 0 Unknown, 43 Unchecked, 0.0s Time] [2021-11-23 17:28:30,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2021-11-23 17:28:30,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 580. [2021-11-23 17:28:30,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 580 states, 579 states have (on average 1.3471502590673574) internal successors, (780), 579 states have internal predecessors, (780), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:30,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 580 states to 580 states and 780 transitions. [2021-11-23 17:28:30,841 INFO L78 Accepts]: Start accepts. Automaton has 580 states and 780 transitions. Word has length 96 [2021-11-23 17:28:30,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:30,841 INFO L470 AbstractCegarLoop]: Abstraction has 580 states and 780 transitions. [2021-11-23 17:28:30,842 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 5 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:30,842 INFO L276 IsEmpty]: Start isEmpty. Operand 580 states and 780 transitions. [2021-11-23 17:28:30,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 17:28:30,843 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:30,843 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:30,858 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:31,054 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:31,054 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:31,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:31,056 INFO L85 PathProgramCache]: Analyzing trace with hash -726330930, now seen corresponding path program 1 times [2021-11-23 17:28:31,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:31,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [927587736] [2021-11-23 17:28:31,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:31,057 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:31,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:31,058 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:31,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 17:28:31,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:31,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:28:31,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:31,551 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:28:31,551 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:31,551 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:31,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [927587736] [2021-11-23 17:28:31,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [927587736] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:31,552 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:31,552 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:28:31,552 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965711742] [2021-11-23 17:28:31,552 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:31,553 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:28:31,553 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:31,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:28:31,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:28:31,554 INFO L87 Difference]: Start difference. First operand 580 states and 780 transitions. Second operand has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 5 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:31,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:31,639 INFO L93 Difference]: Finished difference Result 1071 states and 1464 transitions. [2021-11-23 17:28:31,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:28:31,640 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 5 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2021-11-23 17:28:31,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:31,641 INFO L225 Difference]: With dead ends: 1071 [2021-11-23 17:28:31,641 INFO L226 Difference]: Without dead ends: 580 [2021-11-23 17:28:31,642 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:31,643 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 34 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 327 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:31,643 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 327 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 52 Invalid, 0 Unknown, 43 Unchecked, 0.1s Time] [2021-11-23 17:28:31,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2021-11-23 17:28:31,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 580. [2021-11-23 17:28:31,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 580 states, 579 states have (on average 1.3454231433506045) internal successors, (779), 579 states have internal predecessors, (779), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:31,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 580 states to 580 states and 779 transitions. [2021-11-23 17:28:31,677 INFO L78 Accepts]: Start accepts. Automaton has 580 states and 779 transitions. Word has length 96 [2021-11-23 17:28:31,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:31,678 INFO L470 AbstractCegarLoop]: Abstraction has 580 states and 779 transitions. [2021-11-23 17:28:31,678 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 5 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:31,678 INFO L276 IsEmpty]: Start isEmpty. Operand 580 states and 779 transitions. [2021-11-23 17:28:31,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 17:28:31,679 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:31,680 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:31,691 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:31,890 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:31,891 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:31,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:31,891 INFO L85 PathProgramCache]: Analyzing trace with hash -266911538, now seen corresponding path program 1 times [2021-11-23 17:28:31,892 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:31,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1339806033] [2021-11-23 17:28:31,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:31,892 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:31,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:31,893 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:31,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 17:28:31,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:31,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:28:31,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:32,355 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:28:32,355 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:32,355 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:32,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1339806033] [2021-11-23 17:28:32,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1339806033] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:32,355 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:32,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:28:32,356 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966974396] [2021-11-23 17:28:32,356 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:32,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:28:32,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:32,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:28:32,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:28:32,357 INFO L87 Difference]: Start difference. First operand 580 states and 779 transitions. Second operand has 6 states, 6 states have (on average 15.0) internal successors, (90), 5 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:32,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:32,443 INFO L93 Difference]: Finished difference Result 1075 states and 1468 transitions. [2021-11-23 17:28:32,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:28:32,444 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.0) internal successors, (90), 5 states have internal predecessors, (90), 0 states have call successors, (0), 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 96 [2021-11-23 17:28:32,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:32,446 INFO L225 Difference]: With dead ends: 1075 [2021-11-23 17:28:32,446 INFO L226 Difference]: Without dead ends: 580 [2021-11-23 17:28:32,447 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:32,447 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 31 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 40 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:32,448 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 317 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 40 Unchecked, 0.1s Time] [2021-11-23 17:28:32,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2021-11-23 17:28:32,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 580. [2021-11-23 17:28:32,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 580 states, 579 states have (on average 1.3436960276338514) internal successors, (778), 579 states have internal predecessors, (778), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:32,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 580 states to 580 states and 778 transitions. [2021-11-23 17:28:32,480 INFO L78 Accepts]: Start accepts. Automaton has 580 states and 778 transitions. Word has length 96 [2021-11-23 17:28:32,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:32,481 INFO L470 AbstractCegarLoop]: Abstraction has 580 states and 778 transitions. [2021-11-23 17:28:32,481 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.0) internal successors, (90), 5 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:32,481 INFO L276 IsEmpty]: Start isEmpty. Operand 580 states and 778 transitions. [2021-11-23 17:28:32,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 17:28:32,482 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:32,483 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:32,492 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:32,692 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:32,693 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:32,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:32,693 INFO L85 PathProgramCache]: Analyzing trace with hash 550105038, now seen corresponding path program 1 times [2021-11-23 17:28:32,693 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:32,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [548641574] [2021-11-23 17:28:32,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:32,694 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:32,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:32,695 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:32,701 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 17:28:32,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:32,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:28:32,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:33,132 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:28:33,132 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:33,132 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:33,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [548641574] [2021-11-23 17:28:33,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [548641574] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:33,133 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:33,133 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:28:33,133 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966079682] [2021-11-23 17:28:33,133 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:33,133 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:28:33,133 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:33,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:28:33,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:28:33,134 INFO L87 Difference]: Start difference. First operand 580 states and 778 transitions. Second operand has 6 states, 6 states have (on average 14.833333333333334) internal successors, (89), 5 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:33,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:33,233 INFO L93 Difference]: Finished difference Result 1050 states and 1439 transitions. [2021-11-23 17:28:33,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:28:33,234 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.833333333333334) internal successors, (89), 5 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2021-11-23 17:28:33,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:33,235 INFO L225 Difference]: With dead ends: 1050 [2021-11-23 17:28:33,235 INFO L226 Difference]: Without dead ends: 551 [2021-11-23 17:28:33,236 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:33,237 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 52 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 10 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:33,237 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 217 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 10 Unchecked, 0.1s Time] [2021-11-23 17:28:33,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2021-11-23 17:28:33,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 551. [2021-11-23 17:28:33,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 551 states, 550 states have (on average 1.3527272727272728) internal successors, (744), 550 states have internal predecessors, (744), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:33,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 551 states to 551 states and 744 transitions. [2021-11-23 17:28:33,266 INFO L78 Accepts]: Start accepts. Automaton has 551 states and 744 transitions. Word has length 96 [2021-11-23 17:28:33,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:33,267 INFO L470 AbstractCegarLoop]: Abstraction has 551 states and 744 transitions. [2021-11-23 17:28:33,267 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.833333333333334) internal successors, (89), 5 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:33,267 INFO L276 IsEmpty]: Start isEmpty. Operand 551 states and 744 transitions. [2021-11-23 17:28:33,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-23 17:28:33,268 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:33,269 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:33,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:33,479 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:33,479 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:33,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:33,480 INFO L85 PathProgramCache]: Analyzing trace with hash 1884175613, now seen corresponding path program 1 times [2021-11-23 17:28:33,480 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:33,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2124158207] [2021-11-23 17:28:33,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:33,480 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:33,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:33,481 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:33,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 17:28:33,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:33,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:33,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:34,574 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:34,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:34,952 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:34,952 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:34,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2124158207] [2021-11-23 17:28:34,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2124158207] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:34,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1448078908] [2021-11-23 17:28:34,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:34,952 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:34,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:28:34,953 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:28:34,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-23 17:28:35,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:35,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:35,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:36,046 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:36,046 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:36,360 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:36,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1448078908] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:36,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108709447] [2021-11-23 17:28:36,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:36,360 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:28:36,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:28:36,361 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:28:36,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-23 17:28:36,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:36,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:36,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:37,583 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:37,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:37,886 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:37,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [108709447] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:37,886 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:28:37,887 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:28:37,887 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800160267] [2021-11-23 17:28:37,887 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:28:37,888 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:28:37,888 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:37,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:28:37,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:28:37,889 INFO L87 Difference]: Start difference. First operand 551 states and 744 transitions. Second operand has 16 states, 16 states have (on average 11.1875) internal successors, (179), 15 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:38,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:38,058 INFO L93 Difference]: Finished difference Result 1035 states and 1429 transitions. [2021-11-23 17:28:38,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:28:38,060 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.1875) internal successors, (179), 15 states have internal predecessors, (179), 0 states have call successors, (0), 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 97 [2021-11-23 17:28:38,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:38,061 INFO L225 Difference]: With dead ends: 1035 [2021-11-23 17:28:38,062 INFO L226 Difference]: Without dead ends: 565 [2021-11-23 17:28:38,063 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 580 GetRequests, 562 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:28:38,063 INFO L933 BasicCegarLoop]: 101 mSDtfsCounter, 104 mSDsluCounter, 719 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 820 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 88 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:38,064 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 820 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 107 Invalid, 0 Unknown, 88 Unchecked, 0.1s Time] [2021-11-23 17:28:38,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2021-11-23 17:28:38,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 563. [2021-11-23 17:28:38,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 563 states, 562 states have (on average 1.3558718861209964) internal successors, (762), 562 states have internal predecessors, (762), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:38,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 563 states to 563 states and 762 transitions. [2021-11-23 17:28:38,096 INFO L78 Accepts]: Start accepts. Automaton has 563 states and 762 transitions. Word has length 97 [2021-11-23 17:28:38,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:38,096 INFO L470 AbstractCegarLoop]: Abstraction has 563 states and 762 transitions. [2021-11-23 17:28:38,096 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.1875) internal successors, (179), 15 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:38,096 INFO L276 IsEmpty]: Start isEmpty. Operand 563 states and 762 transitions. [2021-11-23 17:28:38,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-23 17:28:38,097 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:38,097 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:38,102 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:38,307 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Ended with exit code 0 [2021-11-23 17:28:38,524 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2021-11-23 17:28:38,699 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:28:38,700 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:38,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:38,700 INFO L85 PathProgramCache]: Analyzing trace with hash 289890931, now seen corresponding path program 1 times [2021-11-23 17:28:38,701 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:38,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2122764006] [2021-11-23 17:28:38,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:38,701 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:38,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:38,702 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:38,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 17:28:38,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:38,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:28:38,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:38,984 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:38,984 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:38,984 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:38,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2122764006] [2021-11-23 17:28:38,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2122764006] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:38,984 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:38,984 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:28:38,984 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477690] [2021-11-23 17:28:38,985 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:38,985 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:38,985 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:38,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:38,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:38,986 INFO L87 Difference]: Start difference. First operand 563 states and 762 transitions. Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:39,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:39,008 INFO L93 Difference]: Finished difference Result 801 states and 1094 transitions. [2021-11-23 17:28:39,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:39,008 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 0 states have call successors, (0), 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 97 [2021-11-23 17:28:39,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:39,009 INFO L225 Difference]: With dead ends: 801 [2021-11-23 17:28:39,009 INFO L226 Difference]: Without dead ends: 331 [2021-11-23 17:28:39,010 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:39,011 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 25 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 214 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 17:28:39,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 214 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:39,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2021-11-23 17:28:39,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 329. [2021-11-23 17:28:39,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 328 states have (on average 1.3018292682926829) internal successors, (427), 328 states have internal predecessors, (427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:39,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 427 transitions. [2021-11-23 17:28:39,036 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 427 transitions. Word has length 97 [2021-11-23 17:28:39,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:39,036 INFO L470 AbstractCegarLoop]: Abstraction has 329 states and 427 transitions. [2021-11-23 17:28:39,036 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:39,037 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 427 transitions. [2021-11-23 17:28:39,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-23 17:28:39,038 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:39,038 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:39,056 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:39,252 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:39,252 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:39,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:39,253 INFO L85 PathProgramCache]: Analyzing trace with hash -2076241117, now seen corresponding path program 1 times [2021-11-23 17:28:39,253 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:39,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1662974442] [2021-11-23 17:28:39,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:39,253 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:39,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:39,254 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:39,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-23 17:28:39,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:39,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:39,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:40,693 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:40,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:41,180 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:41,181 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:41,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1662974442] [2021-11-23 17:28:41,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1662974442] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:41,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1264162306] [2021-11-23 17:28:41,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:41,181 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:41,181 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:28:41,182 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:28:41,185 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-23 17:28:41,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:41,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:41,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:42,545 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:42,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:42,943 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:42,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1264162306] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:42,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855506096] [2021-11-23 17:28:42,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:42,944 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:28:42,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:28:42,945 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:28:42,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-23 17:28:43,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:43,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:43,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:44,023 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:44,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:44,405 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:44,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [855506096] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:44,405 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:28:44,405 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:28:44,405 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917829152] [2021-11-23 17:28:44,405 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:28:44,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:28:44,406 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:44,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:28:44,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:28:44,407 INFO L87 Difference]: Start difference. First operand 329 states and 427 transitions. Second operand has 16 states, 16 states have (on average 11.5625) internal successors, (185), 15 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:44,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:44,546 INFO L93 Difference]: Finished difference Result 577 states and 773 transitions. [2021-11-23 17:28:44,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:28:44,546 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.5625) internal successors, (185), 15 states have internal predecessors, (185), 0 states have call successors, (0), 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 98 [2021-11-23 17:28:44,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:44,547 INFO L225 Difference]: With dead ends: 577 [2021-11-23 17:28:44,547 INFO L226 Difference]: Without dead ends: 341 [2021-11-23 17:28:44,548 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 568 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:28:44,548 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 131 mSDsluCounter, 797 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 896 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 79 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:44,549 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [131 Valid, 896 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 80 Invalid, 0 Unknown, 79 Unchecked, 0.0s Time] [2021-11-23 17:28:44,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2021-11-23 17:28:44,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 341. [2021-11-23 17:28:44,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 341 states, 340 states have (on average 1.3029411764705883) internal successors, (443), 340 states have internal predecessors, (443), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:44,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 443 transitions. [2021-11-23 17:28:44,570 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 443 transitions. Word has length 98 [2021-11-23 17:28:44,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:44,570 INFO L470 AbstractCegarLoop]: Abstraction has 341 states and 443 transitions. [2021-11-23 17:28:44,570 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.5625) internal successors, (185), 15 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:44,571 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 443 transitions. [2021-11-23 17:28:44,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-23 17:28:44,572 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:44,572 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:44,606 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-11-23 17:28:44,792 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:44,987 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (34)] Ended with exit code 0 [2021-11-23 17:28:45,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:45,186 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:45,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:45,187 INFO L85 PathProgramCache]: Analyzing trace with hash -195386380, now seen corresponding path program 1 times [2021-11-23 17:28:45,187 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:45,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [604369514] [2021-11-23 17:28:45,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:45,188 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:45,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:45,189 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:45,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 17:28:45,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:45,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:45,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:46,313 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:46,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:46,816 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:46,817 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:46,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [604369514] [2021-11-23 17:28:46,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [604369514] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:46,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1810546554] [2021-11-23 17:28:46,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:46,818 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:46,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:28:46,819 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:28:46,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-23 17:28:46,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:46,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:46,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:48,064 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:48,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:48,469 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:48,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1810546554] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:48,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [284200340] [2021-11-23 17:28:48,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:48,470 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:28:48,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:28:48,471 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:28:48,472 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-23 17:28:48,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:48,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:48,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:49,620 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:49,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:50,085 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:50,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [284200340] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:50,085 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:28:50,086 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:28:50,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119422952] [2021-11-23 17:28:50,086 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:28:50,087 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:28:50,087 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:50,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:28:50,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:28:50,088 INFO L87 Difference]: Start difference. First operand 341 states and 443 transitions. Second operand has 16 states, 16 states have (on average 11.9375) internal successors, (191), 15 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:50,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:50,268 INFO L93 Difference]: Finished difference Result 589 states and 789 transitions. [2021-11-23 17:28:50,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:28:50,269 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.9375) internal successors, (191), 15 states have internal predecessors, (191), 0 states have call successors, (0), 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 99 [2021-11-23 17:28:50,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:50,270 INFO L225 Difference]: With dead ends: 589 [2021-11-23 17:28:50,270 INFO L226 Difference]: Without dead ends: 353 [2021-11-23 17:28:50,274 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 574 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:28:50,275 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 171 mSDsluCounter, 804 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 901 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 124 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:50,275 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 901 Invalid, 188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 61 Invalid, 0 Unknown, 124 Unchecked, 0.1s Time] [2021-11-23 17:28:50,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2021-11-23 17:28:50,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 353. [2021-11-23 17:28:50,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 353 states, 352 states have (on average 1.3039772727272727) internal successors, (459), 352 states have internal predecessors, (459), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:50,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 353 states to 353 states and 459 transitions. [2021-11-23 17:28:50,298 INFO L78 Accepts]: Start accepts. Automaton has 353 states and 459 transitions. Word has length 99 [2021-11-23 17:28:50,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:50,298 INFO L470 AbstractCegarLoop]: Abstraction has 353 states and 459 transitions. [2021-11-23 17:28:50,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.9375) internal successors, (191), 15 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:50,298 INFO L276 IsEmpty]: Start isEmpty. Operand 353 states and 459 transitions. [2021-11-23 17:28:50,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 17:28:50,299 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:50,300 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:50,315 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:50,532 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2021-11-23 17:28:50,712 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:50,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:50,911 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:50,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:50,912 INFO L85 PathProgramCache]: Analyzing trace with hash -2042461446, now seen corresponding path program 1 times [2021-11-23 17:28:50,912 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:50,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [484786943] [2021-11-23 17:28:50,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:50,912 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:50,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:50,914 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:50,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-23 17:28:50,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:50,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:28:50,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:51,911 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:28:51,911 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:51,912 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:51,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [484786943] [2021-11-23 17:28:51,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [484786943] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:51,912 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:51,912 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:28:51,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118895444] [2021-11-23 17:28:51,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:51,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:28:51,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:51,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:28:51,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:51,913 INFO L87 Difference]: Start difference. First operand 353 states and 459 transitions. Second operand has 7 states, 7 states have (on average 14.142857142857142) internal successors, (99), 7 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:52,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:52,098 INFO L93 Difference]: Finished difference Result 863 states and 1161 transitions. [2021-11-23 17:28:52,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:28:52,099 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 14.142857142857142) internal successors, (99), 7 states have internal predecessors, (99), 0 states have call successors, (0), 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 100 [2021-11-23 17:28:52,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:52,101 INFO L225 Difference]: With dead ends: 863 [2021-11-23 17:28:52,101 INFO L226 Difference]: Without dead ends: 783 [2021-11-23 17:28:52,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:52,103 INFO L933 BasicCegarLoop]: 206 mSDtfsCounter, 678 mSDsluCounter, 437 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 678 SdHoareTripleChecker+Valid, 643 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:52,103 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [678 Valid, 643 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:28:52,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 783 states. [2021-11-23 17:28:52,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 783 to 525. [2021-11-23 17:28:52,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 525 states, 524 states have (on average 1.3148854961832062) internal successors, (689), 524 states have internal predecessors, (689), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:52,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 525 states to 525 states and 689 transitions. [2021-11-23 17:28:52,137 INFO L78 Accepts]: Start accepts. Automaton has 525 states and 689 transitions. Word has length 100 [2021-11-23 17:28:52,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:52,137 INFO L470 AbstractCegarLoop]: Abstraction has 525 states and 689 transitions. [2021-11-23 17:28:52,137 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 14.142857142857142) internal successors, (99), 7 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:52,138 INFO L276 IsEmpty]: Start isEmpty. Operand 525 states and 689 transitions. [2021-11-23 17:28:52,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 17:28:52,138 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:52,139 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:52,153 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:52,349 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:52,350 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:52,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:52,351 INFO L85 PathProgramCache]: Analyzing trace with hash 1996257082, now seen corresponding path program 1 times [2021-11-23 17:28:52,351 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:52,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1332124787] [2021-11-23 17:28:52,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:52,352 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:52,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:52,353 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:52,372 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-23 17:28:52,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:52,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:28:52,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:53,409 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:28:53,409 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:53,409 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:53,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1332124787] [2021-11-23 17:28:53,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1332124787] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:53,410 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:53,410 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:28:53,410 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239821528] [2021-11-23 17:28:53,410 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:53,410 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:28:53,410 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:53,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:28:53,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:53,411 INFO L87 Difference]: Start difference. First operand 525 states and 689 transitions. Second operand has 7 states, 7 states have (on average 13.571428571428571) internal successors, (95), 7 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:53,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:53,557 INFO L93 Difference]: Finished difference Result 957 states and 1286 transitions. [2021-11-23 17:28:53,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:28:53,558 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.571428571428571) internal successors, (95), 7 states have internal predecessors, (95), 0 states have call successors, (0), 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 100 [2021-11-23 17:28:53,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:53,559 INFO L225 Difference]: With dead ends: 957 [2021-11-23 17:28:53,559 INFO L226 Difference]: Without dead ends: 721 [2021-11-23 17:28:53,560 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:53,561 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 615 mSDsluCounter, 468 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 615 SdHoareTripleChecker+Valid, 678 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:53,561 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [615 Valid, 678 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:28:53,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 721 states. [2021-11-23 17:28:53,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 721 to 447. [2021-11-23 17:28:53,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 447 states, 446 states have (on average 1.295964125560538) internal successors, (578), 446 states have internal predecessors, (578), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:53,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 447 states to 447 states and 578 transitions. [2021-11-23 17:28:53,593 INFO L78 Accepts]: Start accepts. Automaton has 447 states and 578 transitions. Word has length 100 [2021-11-23 17:28:53,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:53,594 INFO L470 AbstractCegarLoop]: Abstraction has 447 states and 578 transitions. [2021-11-23 17:28:53,594 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.571428571428571) internal successors, (95), 7 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:53,594 INFO L276 IsEmpty]: Start isEmpty. Operand 447 states and 578 transitions. [2021-11-23 17:28:53,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 17:28:53,595 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:53,595 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:53,607 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:53,806 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:53,807 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:53,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:53,807 INFO L85 PathProgramCache]: Analyzing trace with hash -796351107, now seen corresponding path program 1 times [2021-11-23 17:28:53,807 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:53,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [459358266] [2021-11-23 17:28:53,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:53,808 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:53,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:53,808 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:53,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-23 17:28:53,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:53,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:28:53,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:54,821 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:28:54,821 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:54,821 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:54,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [459358266] [2021-11-23 17:28:54,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [459358266] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:54,822 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:54,822 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:28:54,822 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542528065] [2021-11-23 17:28:54,822 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:54,822 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:28:54,822 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:54,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:28:54,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:54,823 INFO L87 Difference]: Start difference. First operand 447 states and 578 transitions. Second operand has 7 states, 7 states have (on average 13.714285714285714) internal successors, (96), 7 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:54,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:54,992 INFO L93 Difference]: Finished difference Result 879 states and 1175 transitions. [2021-11-23 17:28:54,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:28:54,993 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.714285714285714) internal successors, (96), 7 states have internal predecessors, (96), 0 states have call successors, (0), 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 100 [2021-11-23 17:28:54,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:54,995 INFO L225 Difference]: With dead ends: 879 [2021-11-23 17:28:54,995 INFO L226 Difference]: Without dead ends: 799 [2021-11-23 17:28:54,996 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:54,996 INFO L933 BasicCegarLoop]: 218 mSDtfsCounter, 662 mSDsluCounter, 530 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 662 SdHoareTripleChecker+Valid, 748 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:54,997 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [662 Valid, 748 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:28:54,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 799 states. [2021-11-23 17:28:55,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 799 to 529. [2021-11-23 17:28:55,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 529 states, 528 states have (on average 1.3011363636363635) internal successors, (687), 528 states have internal predecessors, (687), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:55,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 529 states to 529 states and 687 transitions. [2021-11-23 17:28:55,034 INFO L78 Accepts]: Start accepts. Automaton has 529 states and 687 transitions. Word has length 100 [2021-11-23 17:28:55,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:55,035 INFO L470 AbstractCegarLoop]: Abstraction has 529 states and 687 transitions. [2021-11-23 17:28:55,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.714285714285714) internal successors, (96), 7 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:55,035 INFO L276 IsEmpty]: Start isEmpty. Operand 529 states and 687 transitions. [2021-11-23 17:28:55,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 17:28:55,036 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:55,036 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:55,048 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:55,247 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:55,248 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:55,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:55,248 INFO L85 PathProgramCache]: Analyzing trace with hash 2143152410, now seen corresponding path program 1 times [2021-11-23 17:28:55,248 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:55,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1042003191] [2021-11-23 17:28:55,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:55,248 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:55,249 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:55,249 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:55,251 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-23 17:28:55,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:55,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:28:55,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:56,338 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:28:56,339 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:56,339 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:56,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1042003191] [2021-11-23 17:28:56,339 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1042003191] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:56,339 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:56,339 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:28:56,339 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262173986] [2021-11-23 17:28:56,339 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:56,340 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:28:56,340 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:56,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:28:56,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:56,340 INFO L87 Difference]: Start difference. First operand 529 states and 687 transitions. Second operand has 7 states, 7 states have (on average 13.857142857142858) internal successors, (97), 7 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:56,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:56,499 INFO L93 Difference]: Finished difference Result 961 states and 1284 transitions. [2021-11-23 17:28:56,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:28:56,500 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.857142857142858) internal successors, (97), 7 states have internal predecessors, (97), 0 states have call successors, (0), 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 100 [2021-11-23 17:28:56,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:56,502 INFO L225 Difference]: With dead ends: 961 [2021-11-23 17:28:56,502 INFO L226 Difference]: Without dead ends: 881 [2021-11-23 17:28:56,502 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:56,503 INFO L933 BasicCegarLoop]: 226 mSDtfsCounter, 566 mSDsluCounter, 519 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 566 SdHoareTripleChecker+Valid, 745 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:56,503 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [566 Valid, 745 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:28:56,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 881 states. [2021-11-23 17:28:56,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 881 to 617. [2021-11-23 17:28:56,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 617 states, 616 states have (on average 1.3051948051948052) internal successors, (804), 616 states have internal predecessors, (804), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:56,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 617 states to 617 states and 804 transitions. [2021-11-23 17:28:56,546 INFO L78 Accepts]: Start accepts. Automaton has 617 states and 804 transitions. Word has length 100 [2021-11-23 17:28:56,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:56,546 INFO L470 AbstractCegarLoop]: Abstraction has 617 states and 804 transitions. [2021-11-23 17:28:56,546 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.857142857142858) internal successors, (97), 7 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:56,546 INFO L276 IsEmpty]: Start isEmpty. Operand 617 states and 804 transitions. [2021-11-23 17:28:56,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 17:28:56,547 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:56,548 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:56,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:56,758 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:56,759 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:56,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:56,759 INFO L85 PathProgramCache]: Analyzing trace with hash 1782800285, now seen corresponding path program 1 times [2021-11-23 17:28:56,760 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:56,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1758938553] [2021-11-23 17:28:56,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:56,760 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:56,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:56,762 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:56,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-23 17:28:56,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:56,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:28:56,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:57,742 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:28:57,742 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:57,742 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:57,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1758938553] [2021-11-23 17:28:57,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1758938553] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:57,742 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:57,743 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:28:57,743 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358506136] [2021-11-23 17:28:57,743 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:57,743 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:28:57,743 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:57,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:28:57,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:57,746 INFO L87 Difference]: Start difference. First operand 617 states and 804 transitions. Second operand has 7 states, 7 states have (on average 14.0) internal successors, (98), 7 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:57,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:57,906 INFO L93 Difference]: Finished difference Result 1049 states and 1401 transitions. [2021-11-23 17:28:57,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:28:57,906 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 14.0) internal successors, (98), 7 states have internal predecessors, (98), 0 states have call successors, (0), 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 100 [2021-11-23 17:28:57,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:57,908 INFO L225 Difference]: With dead ends: 1049 [2021-11-23 17:28:57,908 INFO L226 Difference]: Without dead ends: 969 [2021-11-23 17:28:57,908 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:57,909 INFO L933 BasicCegarLoop]: 227 mSDtfsCounter, 530 mSDsluCounter, 503 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 530 SdHoareTripleChecker+Valid, 730 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:57,909 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [530 Valid, 730 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:28:57,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 969 states. [2021-11-23 17:28:57,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 969 to 711. [2021-11-23 17:28:57,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 711 states, 710 states have (on average 1.3084507042253521) internal successors, (929), 710 states have internal predecessors, (929), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:57,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 711 states to 711 states and 929 transitions. [2021-11-23 17:28:57,972 INFO L78 Accepts]: Start accepts. Automaton has 711 states and 929 transitions. Word has length 100 [2021-11-23 17:28:57,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:57,972 INFO L470 AbstractCegarLoop]: Abstraction has 711 states and 929 transitions. [2021-11-23 17:28:57,972 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 14.0) internal successors, (98), 7 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:57,973 INFO L276 IsEmpty]: Start isEmpty. Operand 711 states and 929 transitions. [2021-11-23 17:28:57,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 17:28:57,974 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:57,974 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:57,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:58,185 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:58,185 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:58,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:58,186 INFO L85 PathProgramCache]: Analyzing trace with hash -390142434, now seen corresponding path program 1 times [2021-11-23 17:28:58,186 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:58,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1276627221] [2021-11-23 17:28:58,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:58,187 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:58,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:58,188 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:58,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-23 17:28:58,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:58,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:28:58,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:00,071 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:00,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:00,783 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:00,784 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:00,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1276627221] [2021-11-23 17:29:00,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1276627221] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:00,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1421754003] [2021-11-23 17:29:00,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:00,784 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:29:00,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:29:00,785 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:29:00,786 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (45)] Waiting until timeout for monitored process [2021-11-23 17:29:00,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:00,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:29:00,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:04,487 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:04,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:04,991 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:04,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1421754003] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:04,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1398824589] [2021-11-23 17:29:04,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:04,992 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:29:04,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:29:04,993 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:29:04,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-23 17:29:05,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:05,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:29:05,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:06,842 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:06,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:07,231 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:07,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1398824589] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:07,231 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:29:07,231 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 18, 14, 16, 14] total 42 [2021-11-23 17:29:07,232 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428291362] [2021-11-23 17:29:07,232 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:29:07,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-23 17:29:07,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:07,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-23 17:29:07,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=1484, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 17:29:07,235 INFO L87 Difference]: Start difference. First operand 711 states and 929 transitions. Second operand has 42 states, 42 states have (on average 6.595238095238095) internal successors, (277), 42 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:07,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:07,632 INFO L93 Difference]: Finished difference Result 1098 states and 1428 transitions. [2021-11-23 17:29:07,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:29:07,632 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 6.595238095238095) internal successors, (277), 42 states have internal predecessors, (277), 0 states have call successors, (0), 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 101 [2021-11-23 17:29:07,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:07,635 INFO L225 Difference]: With dead ends: 1098 [2021-11-23 17:29:07,635 INFO L226 Difference]: Without dead ends: 902 [2021-11-23 17:29:07,636 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 602 GetRequests, 560 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 699 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=269, Invalid=1623, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:29:07,637 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 249 mSDsluCounter, 2079 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 249 SdHoareTripleChecker+Valid, 2211 SdHoareTripleChecker+Invalid, 425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 191 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:07,637 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [249 Valid, 2211 Invalid, 425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 226 Invalid, 0 Unknown, 191 Unchecked, 0.2s Time] [2021-11-23 17:29:07,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 902 states. [2021-11-23 17:29:07,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 902 to 683. [2021-11-23 17:29:07,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 683 states, 682 states have (on average 1.3079178885630498) internal successors, (892), 682 states have internal predecessors, (892), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:07,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 683 states to 683 states and 892 transitions. [2021-11-23 17:29:07,686 INFO L78 Accepts]: Start accepts. Automaton has 683 states and 892 transitions. Word has length 101 [2021-11-23 17:29:07,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:07,687 INFO L470 AbstractCegarLoop]: Abstraction has 683 states and 892 transitions. [2021-11-23 17:29:07,687 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 6.595238095238095) internal successors, (277), 42 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:07,687 INFO L276 IsEmpty]: Start isEmpty. Operand 683 states and 892 transitions. [2021-11-23 17:29:07,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 17:29:07,688 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:07,688 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:29:07,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (45)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:07,915 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:08,098 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (44)] Ended with exit code 0 [2021-11-23 17:29:08,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:08,291 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:08,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:08,291 INFO L85 PathProgramCache]: Analyzing trace with hash -415427589, now seen corresponding path program 1 times [2021-11-23 17:29:08,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:08,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [202471539] [2021-11-23 17:29:08,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:08,292 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:08,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:08,293 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:08,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-23 17:29:08,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:08,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 17:29:08,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:17,235 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:17,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:21,795 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:21,795 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:21,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [202471539] [2021-11-23 17:29:21,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [202471539] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:21,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [473970158] [2021-11-23 17:29:21,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:21,796 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:29:21,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:29:21,797 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:29:21,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2021-11-23 17:29:21,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:21,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 17:29:21,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:34,614 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:34,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:37,973 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:37,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [473970158] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:37,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [866262547] [2021-11-23 17:29:37,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:37,973 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:29:37,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:29:37,974 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:29:37,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-23 17:29:38,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:38,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:29:38,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:40,801 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:40,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:42,053 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:42,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [866262547] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:42,054 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:29:42,054 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 28, 32, 28, 10, 9] total 98 [2021-11-23 17:29:42,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304733291] [2021-11-23 17:29:42,055 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:29:42,056 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-11-23 17:29:42,056 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:42,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-11-23 17:29:42,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1057, Invalid=8449, Unknown=0, NotChecked=0, Total=9506 [2021-11-23 17:29:42,061 INFO L87 Difference]: Start difference. First operand 683 states and 892 transitions. Second operand has 98 states, 98 states have (on average 4.295918367346939) internal successors, (421), 98 states have internal predecessors, (421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:43,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:43,927 INFO L93 Difference]: Finished difference Result 1092 states and 1415 transitions. [2021-11-23 17:29:43,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-23 17:29:43,927 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 4.295918367346939) internal successors, (421), 98 states have internal predecessors, (421), 0 states have call successors, (0), 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 101 [2021-11-23 17:29:43,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:43,929 INFO L225 Difference]: With dead ends: 1092 [2021-11-23 17:29:43,930 INFO L226 Difference]: Without dead ends: 930 [2021-11-23 17:29:43,934 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 602 GetRequests, 502 SyntacticMatches, 2 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4552 ImplicationChecksByTransitivity, 19.2s TimeCoverageRelationStatistics Valid=1114, Invalid=8786, Unknown=0, NotChecked=0, Total=9900 [2021-11-23 17:29:43,934 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 384 mSDsluCounter, 3133 mSDsCounter, 0 mSdLazyCounter, 570 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 384 SdHoareTripleChecker+Valid, 3247 SdHoareTripleChecker+Invalid, 946 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 570 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 365 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:43,935 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [384 Valid, 3247 Invalid, 946 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 570 Invalid, 0 Unknown, 365 Unchecked, 1.0s Time] [2021-11-23 17:29:43,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 930 states. [2021-11-23 17:29:43,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 930 to 699. [2021-11-23 17:29:43,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 699 states, 698 states have (on average 1.3051575931232091) internal successors, (911), 698 states have internal predecessors, (911), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:43,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 699 states to 699 states and 911 transitions. [2021-11-23 17:29:43,993 INFO L78 Accepts]: Start accepts. Automaton has 699 states and 911 transitions. Word has length 101 [2021-11-23 17:29:43,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:43,994 INFO L470 AbstractCegarLoop]: Abstraction has 699 states and 911 transitions. [2021-11-23 17:29:43,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 4.295918367346939) internal successors, (421), 98 states have internal predecessors, (421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:43,995 INFO L276 IsEmpty]: Start isEmpty. Operand 699 states and 911 transitions. [2021-11-23 17:29:43,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 17:29:43,996 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:43,996 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:29:44,005 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (48)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:44,206 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (47)] Ended with exit code 0 [2021-11-23 17:29:44,420 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2021-11-23 17:29:44,598 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:29:44,599 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:44,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:44,599 INFO L85 PathProgramCache]: Analyzing trace with hash 514868222, now seen corresponding path program 1 times [2021-11-23 17:29:44,600 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:44,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [409883829] [2021-11-23 17:29:44,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:44,600 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:44,600 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:44,601 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:44,602 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-23 17:29:44,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:44,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 17:29:44,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:52,234 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:52,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:57,327 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:57,328 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:57,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [409883829] [2021-11-23 17:29:57,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [409883829] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:57,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [186064254] [2021-11-23 17:29:57,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:57,328 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:29:57,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:29:57,331 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:29:57,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process [2021-11-23 17:29:57,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:57,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 17:29:57,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:23,515 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:23,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:26,182 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:26,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [186064254] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:26,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1902845391] [2021-11-23 17:30:26,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:26,183 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:26,183 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:26,184 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:26,185 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-23 17:30:26,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:26,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-23 17:30:26,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:40,473 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:40,473 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:42,201 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:42,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1902845391] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:42,202 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:42,202 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 29, 35, 28, 34, 28] total 110 [2021-11-23 17:30:42,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044789662] [2021-11-23 17:30:42,202 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:42,203 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 110 states [2021-11-23 17:30:42,203 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:42,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2021-11-23 17:30:42,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1314, Invalid=10676, Unknown=0, NotChecked=0, Total=11990 [2021-11-23 17:30:42,207 INFO L87 Difference]: Start difference. First operand 699 states and 911 transitions. Second operand has 110 states, 110 states have (on average 3.1545454545454548) internal successors, (347), 110 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:49,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:49,586 INFO L93 Difference]: Finished difference Result 1136 states and 1461 transitions. [2021-11-23 17:30:49,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-23 17:30:49,586 INFO L78 Accepts]: Start accepts. Automaton has has 110 states, 110 states have (on average 3.1545454545454548) internal successors, (347), 110 states have internal predecessors, (347), 0 states have call successors, (0), 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 101 [2021-11-23 17:30:49,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:49,589 INFO L225 Difference]: With dead ends: 1136 [2021-11-23 17:30:49,589 INFO L226 Difference]: Without dead ends: 964 [2021-11-23 17:30:49,596 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 634 GetRequests, 503 SyntacticMatches, 2 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6336 ImplicationChecksByTransitivity, 41.2s TimeCoverageRelationStatistics Valid=1825, Invalid=15205, Unknown=0, NotChecked=0, Total=17030 [2021-11-23 17:30:49,597 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 443 mSDsluCounter, 2763 mSDsCounter, 0 mSdLazyCounter, 814 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 443 SdHoareTripleChecker+Valid, 2880 SdHoareTripleChecker+Invalid, 1140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 814 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 302 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:49,597 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [443 Valid, 2880 Invalid, 1140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 814 Invalid, 0 Unknown, 302 Unchecked, 1.3s Time] [2021-11-23 17:30:49,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 964 states. [2021-11-23 17:30:49,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 964 to 700. [2021-11-23 17:30:49,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 700 states, 699 states have (on average 1.3047210300429184) internal successors, (912), 699 states have internal predecessors, (912), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:49,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 700 states to 700 states and 912 transitions. [2021-11-23 17:30:49,660 INFO L78 Accepts]: Start accepts. Automaton has 700 states and 912 transitions. Word has length 101 [2021-11-23 17:30:49,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:49,661 INFO L470 AbstractCegarLoop]: Abstraction has 700 states and 912 transitions. [2021-11-23 17:30:49,661 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 110 states, 110 states have (on average 3.1545454545454548) internal successors, (347), 110 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:49,661 INFO L276 IsEmpty]: Start isEmpty. Operand 700 states and 912 transitions. [2021-11-23 17:30:49,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 17:30:49,662 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:49,663 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:49,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (50)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:49,876 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (51)] Ended with exit code 0 [2021-11-23 17:30:50,097 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2021-11-23 17:30:50,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:50,275 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:50,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:50,276 INFO L85 PathProgramCache]: Analyzing trace with hash -2066113061, now seen corresponding path program 1 times [2021-11-23 17:30:50,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:50,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [470380760] [2021-11-23 17:30:50,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:50,276 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:50,276 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:50,277 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:50,278 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (53)] Waiting until timeout for monitored process [2021-11-23 17:30:50,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:50,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:30:50,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:51,910 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:51,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:52,476 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:52,477 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:52,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [470380760] [2021-11-23 17:30:52,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [470380760] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:52,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [855871975] [2021-11-23 17:30:52,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:52,479 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:52,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:52,480 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:52,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (54)] Waiting until timeout for monitored process [2021-11-23 17:30:52,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:52,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 17:30:52,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:12,257 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:12,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:24,440 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:24,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [855871975] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:24,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597350024] [2021-11-23 17:31:24,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:24,440 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:24,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:24,441 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:24,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-23 17:31:24,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:24,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-23 17:31:24,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:40,778 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:40,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:42,802 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:42,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1597350024] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:42,803 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:42,803 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 35, 28, 34, 28] total 97 [2021-11-23 17:31:42,804 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170564793] [2021-11-23 17:31:42,804 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:42,805 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-23 17:31:42,805 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:42,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-23 17:31:42,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=906, Invalid=8406, Unknown=0, NotChecked=0, Total=9312 [2021-11-23 17:31:42,809 INFO L87 Difference]: Start difference. First operand 700 states and 912 transitions. Second operand has 97 states, 97 states have (on average 4.34020618556701) internal successors, (421), 97 states have internal predecessors, (421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:52,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:52,986 INFO L93 Difference]: Finished difference Result 1170 states and 1499 transitions. [2021-11-23 17:31:52,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-23 17:31:52,986 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 4.34020618556701) internal successors, (421), 97 states have internal predecessors, (421), 0 states have call successors, (0), 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 101 [2021-11-23 17:31:52,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:52,988 INFO L225 Difference]: With dead ends: 1170 [2021-11-23 17:31:52,989 INFO L226 Difference]: Without dead ends: 986 [2021-11-23 17:31:52,991 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 629 GetRequests, 514 SyntacticMatches, 1 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4107 ImplicationChecksByTransitivity, 43.4s TimeCoverageRelationStatistics Valid=1323, Invalid=12017, Unknown=0, NotChecked=0, Total=13340 [2021-11-23 17:31:52,992 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 361 mSDsluCounter, 2733 mSDsCounter, 0 mSdLazyCounter, 754 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 361 SdHoareTripleChecker+Valid, 2853 SdHoareTripleChecker+Invalid, 1086 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 754 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 315 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:52,992 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [361 Valid, 2853 Invalid, 1086 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 754 Invalid, 0 Unknown, 315 Unchecked, 1.3s Time] [2021-11-23 17:31:52,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 986 states. [2021-11-23 17:31:53,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 986 to 701. [2021-11-23 17:31:53,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 701 states, 700 states have (on average 1.3042857142857143) internal successors, (913), 700 states have internal predecessors, (913), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:53,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 701 states to 701 states and 913 transitions. [2021-11-23 17:31:53,082 INFO L78 Accepts]: Start accepts. Automaton has 701 states and 913 transitions. Word has length 101 [2021-11-23 17:31:53,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:53,083 INFO L470 AbstractCegarLoop]: Abstraction has 701 states and 913 transitions. [2021-11-23 17:31:53,083 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 4.34020618556701) internal successors, (421), 97 states have internal predecessors, (421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:53,083 INFO L276 IsEmpty]: Start isEmpty. Operand 701 states and 913 transitions. [2021-11-23 17:31:53,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 17:31:53,084 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:53,085 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:31:53,129 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:53,299 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (54)] Ended with exit code 0 [2021-11-23 17:31:53,505 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (53)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:53,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:53,698 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:53,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:53,699 INFO L85 PathProgramCache]: Analyzing trace with hash -1356736299, now seen corresponding path program 1 times [2021-11-23 17:31:53,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:53,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [585045212] [2021-11-23 17:31:53,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:53,700 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:53,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:53,701 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:53,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-23 17:31:53,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:53,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:31:53,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:57,185 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:57,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:58,237 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:58,237 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:58,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [585045212] [2021-11-23 17:31:58,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [585045212] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:58,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [488845646] [2021-11-23 17:31:58,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:58,238 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:58,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:58,239 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:58,243 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (57)] Waiting until timeout for monitored process [2021-11-23 17:31:58,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:58,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:31:58,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:01,411 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:01,411 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:02,128 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:02,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [488845646] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:02,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723540884] [2021-11-23 17:32:02,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:02,128 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:02,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:02,129 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:02,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-23 17:32:02,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:02,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 17:32:02,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:05,808 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:05,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:07,570 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:07,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1723540884] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:07,570 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:07,571 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 17, 15, 17, 16] total 49 [2021-11-23 17:32:07,571 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729276274] [2021-11-23 17:32:07,571 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:07,572 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-23 17:32:07,572 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:07,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-23 17:32:07,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=1986, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 17:32:07,573 INFO L87 Difference]: Start difference. First operand 701 states and 913 transitions. Second operand has 49 states, 49 states have (on average 6.36734693877551) internal successors, (312), 49 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:07,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:07,766 INFO L93 Difference]: Finished difference Result 1098 states and 1424 transitions. [2021-11-23 17:32:07,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:32:07,770 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 6.36734693877551) internal successors, (312), 49 states have internal predecessors, (312), 0 states have call successors, (0), 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 102 [2021-11-23 17:32:07,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:07,772 INFO L225 Difference]: With dead ends: 1098 [2021-11-23 17:32:07,772 INFO L226 Difference]: Without dead ends: 932 [2021-11-23 17:32:07,774 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 607 GetRequests, 559 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 803 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=394, Invalid=2056, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:32:07,774 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 226 mSDsluCounter, 2471 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 2604 SdHoareTripleChecker+Invalid, 322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 236 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:07,775 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [226 Valid, 2604 Invalid, 322 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 83 Invalid, 0 Unknown, 236 Unchecked, 0.1s Time] [2021-11-23 17:32:07,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 932 states. [2021-11-23 17:32:07,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 932 to 707. [2021-11-23 17:32:07,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 707 states, 706 states have (on average 1.3031161473087818) internal successors, (920), 706 states have internal predecessors, (920), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:07,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 707 states to 707 states and 920 transitions. [2021-11-23 17:32:07,844 INFO L78 Accepts]: Start accepts. Automaton has 707 states and 920 transitions. Word has length 102 [2021-11-23 17:32:07,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:07,845 INFO L470 AbstractCegarLoop]: Abstraction has 707 states and 920 transitions. [2021-11-23 17:32:07,845 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 6.36734693877551) internal successors, (312), 49 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:07,845 INFO L276 IsEmpty]: Start isEmpty. Operand 707 states and 920 transitions. [2021-11-23 17:32:07,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 17:32:07,846 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:07,847 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:07,863 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:08,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:08,260 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (57)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:08,459 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:08,459 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:08,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:08,460 INFO L85 PathProgramCache]: Analyzing trace with hash -426440488, now seen corresponding path program 1 times [2021-11-23 17:32:08,460 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:08,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [865650369] [2021-11-23 17:32:08,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:08,460 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:08,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:08,461 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:08,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (59)] Waiting until timeout for monitored process [2021-11-23 17:32:08,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:08,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:32:08,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:10,112 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:10,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:10,501 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:10,502 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:10,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [865650369] [2021-11-23 17:32:10,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [865650369] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:10,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1423561949] [2021-11-23 17:32:10,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:10,502 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:10,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:10,503 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:10,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (60)] Waiting until timeout for monitored process [2021-11-23 17:32:10,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:10,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:32:10,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:12,440 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:12,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:12,943 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:12,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1423561949] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:12,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1457260522] [2021-11-23 17:32:12,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:12,943 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:12,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:12,945 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:12,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-23 17:32:13,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:13,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:32:13,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:15,011 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:15,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:16,042 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:16,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1457260522] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:16,042 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:16,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 12, 10] total 45 [2021-11-23 17:32:16,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230036803] [2021-11-23 17:32:16,043 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:16,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-23 17:32:16,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:16,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-23 17:32:16,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1818, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:32:16,046 INFO L87 Difference]: Start difference. First operand 707 states and 920 transitions. Second operand has 45 states, 45 states have (on average 10.644444444444444) internal successors, (479), 45 states have internal predecessors, (479), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:16,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:16,943 INFO L93 Difference]: Finished difference Result 1088 states and 1411 transitions. [2021-11-23 17:32:16,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:32:16,943 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 10.644444444444444) internal successors, (479), 45 states have internal predecessors, (479), 0 states have call successors, (0), 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 102 [2021-11-23 17:32:16,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:16,945 INFO L225 Difference]: With dead ends: 1088 [2021-11-23 17:32:16,945 INFO L226 Difference]: Without dead ends: 910 [2021-11-23 17:32:16,946 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 624 GetRequests, 568 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 732 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=315, Invalid=2877, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 17:32:16,947 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 204 mSDsluCounter, 1889 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 2021 SdHoareTripleChecker+Invalid, 356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 213 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:16,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [204 Valid, 2021 Invalid, 356 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 135 Invalid, 0 Unknown, 213 Unchecked, 0.1s Time] [2021-11-23 17:32:16,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 910 states. [2021-11-23 17:32:17,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 910 to 685. [2021-11-23 17:32:17,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 685 states, 684 states have (on average 1.3026315789473684) internal successors, (891), 684 states have internal predecessors, (891), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:17,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 685 states to 685 states and 891 transitions. [2021-11-23 17:32:17,017 INFO L78 Accepts]: Start accepts. Automaton has 685 states and 891 transitions. Word has length 102 [2021-11-23 17:32:17,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:17,018 INFO L470 AbstractCegarLoop]: Abstraction has 685 states and 891 transitions. [2021-11-23 17:32:17,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 10.644444444444444) internal successors, (479), 45 states have internal predecessors, (479), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:17,019 INFO L276 IsEmpty]: Start isEmpty. Operand 685 states and 891 transitions. [2021-11-23 17:32:17,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 17:32:17,020 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:17,020 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:17,027 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (60)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:17,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (59)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:17,459 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Ended with exit code 0 [2021-11-23 17:32:17,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:17,633 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:17,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:17,634 INFO L85 PathProgramCache]: Analyzing trace with hash 1287545525, now seen corresponding path program 1 times [2021-11-23 17:32:17,634 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:17,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1793004990] [2021-11-23 17:32:17,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:17,634 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:17,635 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:17,635 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:17,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (62)] Waiting until timeout for monitored process [2021-11-23 17:32:17,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:17,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:32:17,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:19,284 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:19,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:19,724 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:19,724 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:19,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1793004990] [2021-11-23 17:32:19,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1793004990] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:19,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [26489038] [2021-11-23 17:32:19,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:19,725 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:19,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:19,726 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:19,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (63)] Waiting until timeout for monitored process [2021-11-23 17:32:19,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:19,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:32:19,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:21,795 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:21,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:22,374 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:22,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [26489038] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:22,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1069206505] [2021-11-23 17:32:22,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:22,374 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:22,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:22,375 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:22,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-23 17:32:22,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:22,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:32:22,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:24,306 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:24,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:25,372 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:25,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1069206505] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:25,372 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:25,373 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 12, 10] total 45 [2021-11-23 17:32:25,373 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051826942] [2021-11-23 17:32:25,373 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:25,374 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-23 17:32:25,374 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:25,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-23 17:32:25,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1818, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:32:25,376 INFO L87 Difference]: Start difference. First operand 685 states and 891 transitions. Second operand has 45 states, 45 states have (on average 10.71111111111111) internal successors, (482), 45 states have internal predecessors, (482), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:26,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:26,298 INFO L93 Difference]: Finished difference Result 1062 states and 1378 transitions. [2021-11-23 17:32:26,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:32:26,298 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 10.71111111111111) internal successors, (482), 45 states have internal predecessors, (482), 0 states have call successors, (0), 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 102 [2021-11-23 17:32:26,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:26,303 INFO L225 Difference]: With dead ends: 1062 [2021-11-23 17:32:26,303 INFO L226 Difference]: Without dead ends: 878 [2021-11-23 17:32:26,304 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 624 GetRequests, 568 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 731 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=315, Invalid=2877, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 17:32:26,305 INFO L933 BasicCegarLoop]: 129 mSDtfsCounter, 127 mSDsluCounter, 3531 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 3660 SdHoareTripleChecker+Invalid, 379 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 243 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:26,306 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 3660 Invalid, 379 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 131 Invalid, 0 Unknown, 243 Unchecked, 0.1s Time] [2021-11-23 17:32:26,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 878 states. [2021-11-23 17:32:26,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 878 to 653. [2021-11-23 17:32:26,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 653 states, 652 states have (on average 1.3082822085889572) internal successors, (853), 652 states have internal predecessors, (853), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:26,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 653 states to 653 states and 853 transitions. [2021-11-23 17:32:26,369 INFO L78 Accepts]: Start accepts. Automaton has 653 states and 853 transitions. Word has length 102 [2021-11-23 17:32:26,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:26,370 INFO L470 AbstractCegarLoop]: Abstraction has 653 states and 853 transitions. [2021-11-23 17:32:26,370 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 10.71111111111111) internal successors, (482), 45 states have internal predecessors, (482), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:26,370 INFO L276 IsEmpty]: Start isEmpty. Operand 653 states and 853 transitions. [2021-11-23 17:32:26,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 17:32:26,372 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:26,372 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:32:26,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (62)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:26,590 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (63)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:26,832 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:26,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:26,987 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:26,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:26,987 INFO L85 PathProgramCache]: Analyzing trace with hash -1236937175, now seen corresponding path program 1 times [2021-11-23 17:32:26,987 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:26,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1593894570] [2021-11-23 17:32:26,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:26,987 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:26,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:26,989 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:26,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Waiting until timeout for monitored process [2021-11-23 17:32:27,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:27,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:32:27,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:27,369 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:27,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:27,621 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:27,621 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:27,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1593894570] [2021-11-23 17:32:27,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1593894570] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:27,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [612617253] [2021-11-23 17:32:27,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:27,622 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:27,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:27,626 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:27,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (66)] Waiting until timeout for monitored process [2021-11-23 17:32:27,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:27,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:32:27,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:28,100 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:28,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:28,375 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:28,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [612617253] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:28,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1802888268] [2021-11-23 17:32:28,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:28,375 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:28,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:28,377 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:28,378 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-23 17:32:28,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:28,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:32:28,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:28,790 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:28,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:29,276 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:29,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1802888268] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:29,276 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:29,277 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 5] total 7 [2021-11-23 17:32:29,277 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613874588] [2021-11-23 17:32:29,277 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:29,278 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:32:29,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:29,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:32:29,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:32:29,279 INFO L87 Difference]: Start difference. First operand 653 states and 853 transitions. Second operand has 7 states, 7 states have (on average 36.285714285714285) internal successors, (254), 7 states have internal predecessors, (254), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:29,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:29,512 INFO L93 Difference]: Finished difference Result 2206 states and 2905 transitions. [2021-11-23 17:32:29,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 17:32:29,514 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 36.285714285714285) internal successors, (254), 7 states have internal predecessors, (254), 0 states have call successors, (0), 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 102 [2021-11-23 17:32:29,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:29,517 INFO L225 Difference]: With dead ends: 2206 [2021-11-23 17:32:29,518 INFO L226 Difference]: Without dead ends: 1658 [2021-11-23 17:32:29,519 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 607 GetRequests, 598 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 17:32:29,520 INFO L933 BasicCegarLoop]: 158 mSDtfsCounter, 329 mSDsluCounter, 429 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 329 SdHoareTripleChecker+Valid, 587 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 11 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:29,520 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [329 Valid, 587 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 29 Invalid, 0 Unknown, 11 Unchecked, 0.1s Time] [2021-11-23 17:32:29,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1658 states. [2021-11-23 17:32:29,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1658 to 1502. [2021-11-23 17:32:29,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1502 states, 1501 states have (on average 1.2984676882078614) internal successors, (1949), 1501 states have internal predecessors, (1949), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:29,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1502 states to 1502 states and 1949 transitions. [2021-11-23 17:32:29,674 INFO L78 Accepts]: Start accepts. Automaton has 1502 states and 1949 transitions. Word has length 102 [2021-11-23 17:32:29,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:29,675 INFO L470 AbstractCegarLoop]: Abstraction has 1502 states and 1949 transitions. [2021-11-23 17:32:29,675 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 36.285714285714285) internal successors, (254), 7 states have internal predecessors, (254), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:29,675 INFO L276 IsEmpty]: Start isEmpty. Operand 1502 states and 1949 transitions. [2021-11-23 17:32:29,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 17:32:29,676 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:29,676 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:29,720 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:29,911 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (66)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:30,110 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Ended with exit code 0 [2021-11-23 17:32:30,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:32:30,302 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:30,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:30,303 INFO L85 PathProgramCache]: Analyzing trace with hash 1498439762, now seen corresponding path program 1 times [2021-11-23 17:32:30,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:30,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [151874888] [2021-11-23 17:32:30,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:30,303 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:30,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:30,305 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:30,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Waiting until timeout for monitored process [2021-11-23 17:32:30,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:30,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 17:32:30,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:02,735 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:02,735 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:25,356 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:25,356 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:25,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [151874888] [2021-11-23 17:33:25,356 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [151874888] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:25,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [759361740] [2021-11-23 17:33:25,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:25,357 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:25,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:25,358 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:25,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (69)] Waiting until timeout for monitored process [2021-11-23 17:33:25,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:25,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 17:33:25,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:53,320 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:53,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:58,463 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:58,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [759361740] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:58,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [158855507] [2021-11-23 17:33:58,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:58,464 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:58,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:58,465 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:58,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-23 17:33:58,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:58,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 17:33:58,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:05,105 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:05,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:07,101 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:07,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [158855507] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:07,101 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:07,102 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 30, 35, 28, 35, 28] total 88 [2021-11-23 17:34:07,102 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015927190] [2021-11-23 17:34:07,102 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:07,102 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2021-11-23 17:34:07,103 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:07,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-11-23 17:34:07,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=886, Invalid=6770, Unknown=0, NotChecked=0, Total=7656 [2021-11-23 17:34:07,104 INFO L87 Difference]: Start difference. First operand 1502 states and 1949 transitions. Second operand has 88 states, 88 states have (on average 3.0) internal successors, (264), 88 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:09,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:09,899 INFO L93 Difference]: Finished difference Result 1966 states and 2555 transitions. [2021-11-23 17:34:09,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-23 17:34:09,899 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 3.0) internal successors, (264), 88 states have internal predecessors, (264), 0 states have call successors, (0), 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 102 [2021-11-23 17:34:09,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:09,904 INFO L225 Difference]: With dead ends: 1966 [2021-11-23 17:34:09,905 INFO L226 Difference]: Without dead ends: 1547 [2021-11-23 17:34:09,910 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 608 GetRequests, 519 SyntacticMatches, 1 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3135 ImplicationChecksByTransitivity, 71.9s TimeCoverageRelationStatistics Valid=952, Invalid=7058, Unknown=0, NotChecked=0, Total=8010 [2021-11-23 17:34:09,912 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 266 mSDsluCounter, 2024 mSDsCounter, 0 mSdLazyCounter, 575 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 2104 SdHoareTripleChecker+Invalid, 871 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 575 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 281 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:09,913 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [266 Valid, 2104 Invalid, 871 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 575 Invalid, 0 Unknown, 281 Unchecked, 1.1s Time] [2021-11-23 17:34:09,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1547 states. [2021-11-23 17:34:10,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1547 to 1523. [2021-11-23 17:34:10,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1523 states, 1522 states have (on average 1.2969776609724046) internal successors, (1974), 1522 states have internal predecessors, (1974), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:10,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1523 states to 1523 states and 1974 transitions. [2021-11-23 17:34:10,064 INFO L78 Accepts]: Start accepts. Automaton has 1523 states and 1974 transitions. Word has length 102 [2021-11-23 17:34:10,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:10,065 INFO L470 AbstractCegarLoop]: Abstraction has 1523 states and 1974 transitions. [2021-11-23 17:34:10,065 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 3.0) internal successors, (264), 88 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:10,065 INFO L276 IsEmpty]: Start isEmpty. Operand 1523 states and 1974 transitions. [2021-11-23 17:34:10,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 17:34:10,066 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:10,067 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:10,113 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:10,287 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (69)] Ended with exit code 0 [2021-11-23 17:34:10,495 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:10,686 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:10,686 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:10,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:10,687 INFO L85 PathProgramCache]: Analyzing trace with hash 88509557, now seen corresponding path program 1 times [2021-11-23 17:34:10,687 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:10,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2044012368] [2021-11-23 17:34:10,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:10,688 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:10,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:10,688 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:10,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (71)] Waiting until timeout for monitored process [2021-11-23 17:34:10,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:10,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:34:10,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:13,872 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:13,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:15,036 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:15,036 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:15,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2044012368] [2021-11-23 17:34:15,037 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2044012368] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:15,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1732475940] [2021-11-23 17:34:15,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:15,037 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:15,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:15,038 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:15,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (72)] Waiting until timeout for monitored process [2021-11-23 17:34:15,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:15,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:34:15,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:18,296 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:18,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:18,860 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:18,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1732475940] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:18,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1732691403] [2021-11-23 17:34:18,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:18,860 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:18,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:18,861 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:18,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-23 17:34:18,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:18,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:34:18,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:21,856 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:21,856 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:22,474 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:22,474 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1732691403] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:22,474 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:22,474 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 17, 15, 16, 15] total 30 [2021-11-23 17:34:22,474 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304712183] [2021-11-23 17:34:22,475 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:22,475 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 17:34:22,475 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:22,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 17:34:22,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=728, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:34:22,476 INFO L87 Difference]: Start difference. First operand 1523 states and 1974 transitions. Second operand has 30 states, 30 states have (on average 6.266666666666667) internal successors, (188), 30 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:22,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:22,892 INFO L93 Difference]: Finished difference Result 2457 states and 3151 transitions. [2021-11-23 17:34:22,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:34:22,892 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 6.266666666666667) internal successors, (188), 30 states have internal predecessors, (188), 0 states have call successors, (0), 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 102 [2021-11-23 17:34:22,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:22,894 INFO L225 Difference]: With dead ends: 2457 [2021-11-23 17:34:22,895 INFO L226 Difference]: Without dead ends: 1992 [2021-11-23 17:34:22,895 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 607 GetRequests, 578 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=156, Invalid=774, Unknown=0, NotChecked=0, Total=930 [2021-11-23 17:34:22,896 INFO L933 BasicCegarLoop]: 136 mSDtfsCounter, 184 mSDsluCounter, 1926 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 2062 SdHoareTripleChecker+Invalid, 427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 133 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:22,896 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [184 Valid, 2062 Invalid, 427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 286 Invalid, 0 Unknown, 133 Unchecked, 0.2s Time] [2021-11-23 17:34:22,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1992 states. [2021-11-23 17:34:22,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1992 to 1437. [2021-11-23 17:34:22,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1437 states, 1436 states have (on average 1.2973537604456824) internal successors, (1863), 1436 states have internal predecessors, (1863), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:22,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1437 states to 1437 states and 1863 transitions. [2021-11-23 17:34:22,977 INFO L78 Accepts]: Start accepts. Automaton has 1437 states and 1863 transitions. Word has length 102 [2021-11-23 17:34:22,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:22,977 INFO L470 AbstractCegarLoop]: Abstraction has 1437 states and 1863 transitions. [2021-11-23 17:34:22,977 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 6.266666666666667) internal successors, (188), 30 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:22,977 INFO L276 IsEmpty]: Start isEmpty. Operand 1437 states and 1863 transitions. [2021-11-23 17:34:22,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-23 17:34:22,978 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:22,978 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:23,000 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Ended with exit code 0 [2021-11-23 17:34:23,180 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (72)] Ended with exit code 0 [2021-11-23 17:34:23,388 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (71)] Ended with exit code 0 [2021-11-23 17:34:23,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:23,581 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:23,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:23,581 INFO L85 PathProgramCache]: Analyzing trace with hash -1912326472, now seen corresponding path program 1 times [2021-11-23 17:34:23,582 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:23,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [145948453] [2021-11-23 17:34:23,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:23,582 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:23,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:23,583 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:23,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (74)] Waiting until timeout for monitored process [2021-11-23 17:34:23,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:23,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:34:23,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:25,325 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:25,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:25,766 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:25,766 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:25,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [145948453] [2021-11-23 17:34:25,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [145948453] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:25,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [986123960] [2021-11-23 17:34:25,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:25,767 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:25,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:25,767 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:25,769 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (75)] Waiting until timeout for monitored process [2021-11-23 17:34:25,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:25,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:34:25,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:27,514 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:27,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:27,817 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:27,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [986123960] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:27,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [8156275] [2021-11-23 17:34:27,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:27,818 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:27,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:27,819 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:27,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-23 17:34:27,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:27,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:34:27,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:29,644 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:29,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:30,544 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:30,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [8156275] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:30,544 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:30,544 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 12, 10] total 30 [2021-11-23 17:34:30,544 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325758833] [2021-11-23 17:34:30,545 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:30,545 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 17:34:30,545 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:30,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 17:34:30,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=752, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:34:30,546 INFO L87 Difference]: Start difference. First operand 1437 states and 1863 transitions. Second operand has 30 states, 30 states have (on average 10.533333333333333) internal successors, (316), 30 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:30,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:30,698 INFO L93 Difference]: Finished difference Result 1862 states and 2427 transitions. [2021-11-23 17:34:30,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:34:30,699 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 10.533333333333333) internal successors, (316), 30 states have internal predecessors, (316), 0 states have call successors, (0), 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 103 [2021-11-23 17:34:30,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:30,701 INFO L225 Difference]: With dead ends: 1862 [2021-11-23 17:34:30,702 INFO L226 Difference]: Without dead ends: 1443 [2021-11-23 17:34:30,703 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 613 GetRequests, 583 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=135, Invalid=795, Unknown=0, NotChecked=0, Total=930 [2021-11-23 17:34:30,704 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 147 mSDsluCounter, 1307 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 1415 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 130 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:30,704 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [147 Valid, 1415 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 130 Unchecked, 0.0s Time] [2021-11-23 17:34:30,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1443 states. [2021-11-23 17:34:30,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1443 to 1422. [2021-11-23 17:34:30,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1422 states, 1421 states have (on average 1.298381421534131) internal successors, (1845), 1421 states have internal predecessors, (1845), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:30,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1422 states to 1422 states and 1845 transitions. [2021-11-23 17:34:30,845 INFO L78 Accepts]: Start accepts. Automaton has 1422 states and 1845 transitions. Word has length 103 [2021-11-23 17:34:30,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:30,845 INFO L470 AbstractCegarLoop]: Abstraction has 1422 states and 1845 transitions. [2021-11-23 17:34:30,845 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 10.533333333333333) internal successors, (316), 30 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:30,846 INFO L276 IsEmpty]: Start isEmpty. Operand 1422 states and 1845 transitions. [2021-11-23 17:34:30,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-23 17:34:30,846 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:30,847 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:34:30,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (75)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:31,056 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (74)] Ended with exit code 0 [2021-11-23 17:34:31,272 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Ended with exit code 0 [2021-11-23 17:34:31,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:31,450 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:31,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:31,450 INFO L85 PathProgramCache]: Analyzing trace with hash -1680344211, now seen corresponding path program 1 times [2021-11-23 17:34:31,450 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:31,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [917515378] [2021-11-23 17:34:31,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:31,451 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:31,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:31,451 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:31,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (77)] Waiting until timeout for monitored process [2021-11-23 17:34:31,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:31,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:34:31,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:31,865 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:34:31,865 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:32,104 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:34:32,105 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:32,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [917515378] [2021-11-23 17:34:32,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [917515378] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:32,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1236069839] [2021-11-23 17:34:32,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:32,105 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:32,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:32,112 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:32,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (78)] Waiting until timeout for monitored process [2021-11-23 17:34:32,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:32,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:34:32,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:32,412 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:34:32,413 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:34:32,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1236069839] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:34:32,414 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:34:32,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 17:34:32,415 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624819634] [2021-11-23 17:34:32,415 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:34:32,415 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:34:32,416 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:32,416 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:34:32,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:34:32,417 INFO L87 Difference]: Start difference. First operand 1422 states and 1845 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:32,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:32,595 INFO L93 Difference]: Finished difference Result 2738 states and 3573 transitions. [2021-11-23 17:34:32,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:34:32,596 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 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 103 [2021-11-23 17:34:32,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:32,598 INFO L225 Difference]: With dead ends: 2738 [2021-11-23 17:34:32,598 INFO L226 Difference]: Without dead ends: 1457 [2021-11-23 17:34:32,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 301 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 17:34:32,602 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 72 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:32,602 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 195 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:34:32,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1457 states. [2021-11-23 17:34:32,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1457 to 1419. [2021-11-23 17:34:32,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1419 states, 1418 states have (on average 1.285613540197461) internal successors, (1823), 1418 states have internal predecessors, (1823), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:32,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1419 states to 1419 states and 1823 transitions. [2021-11-23 17:34:32,770 INFO L78 Accepts]: Start accepts. Automaton has 1419 states and 1823 transitions. Word has length 103 [2021-11-23 17:34:32,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:32,770 INFO L470 AbstractCegarLoop]: Abstraction has 1419 states and 1823 transitions. [2021-11-23 17:34:32,770 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:32,771 INFO L276 IsEmpty]: Start isEmpty. Operand 1419 states and 1823 transitions. [2021-11-23 17:34:32,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-23 17:34:32,771 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:32,772 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:32,788 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (77)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:32,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (78)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:33,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:33,186 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:33,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:33,186 INFO L85 PathProgramCache]: Analyzing trace with hash 2130742417, now seen corresponding path program 1 times [2021-11-23 17:34:33,187 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:33,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [55074597] [2021-11-23 17:34:33,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:33,187 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:33,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:33,188 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:33,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Waiting until timeout for monitored process [2021-11-23 17:34:33,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:33,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:34:33,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:34,936 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:34,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:35,362 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:35,362 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:35,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [55074597] [2021-11-23 17:34:35,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [55074597] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:35,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1426515166] [2021-11-23 17:34:35,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:35,363 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:35,363 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:35,364 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:35,365 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (80)] Waiting until timeout for monitored process [2021-11-23 17:34:35,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:35,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-23 17:34:35,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:17,709 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:17,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:26,065 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:26,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1426515166] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:26,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [508815193] [2021-11-23 17:35:26,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:26,066 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:26,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:26,067 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:26,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2021-11-23 17:35:26,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:26,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:35:26,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:32,362 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:32,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:34,517 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:34,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [508815193] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:34,517 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:34,518 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 41, 33, 16, 14] total 108 [2021-11-23 17:35:34,518 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955289639] [2021-11-23 17:35:34,518 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:34,519 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2021-11-23 17:35:34,519 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:34,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2021-11-23 17:35:34,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1367, Invalid=10189, Unknown=0, NotChecked=0, Total=11556 [2021-11-23 17:35:34,521 INFO L87 Difference]: Start difference. First operand 1419 states and 1823 transitions. Second operand has 108 states, 108 states have (on average 4.5092592592592595) internal successors, (487), 108 states have internal predecessors, (487), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:36,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:36,370 INFO L93 Difference]: Finished difference Result 2477 states and 3138 transitions. [2021-11-23 17:35:36,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-23 17:35:36,371 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 108 states have (on average 4.5092592592592595) internal successors, (487), 108 states have internal predecessors, (487), 0 states have call successors, (0), 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 103 [2021-11-23 17:35:36,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:36,373 INFO L225 Difference]: With dead ends: 2477 [2021-11-23 17:35:36,373 INFO L226 Difference]: Without dead ends: 2047 [2021-11-23 17:35:36,376 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 614 GetRequests, 506 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5293 ImplicationChecksByTransitivity, 45.3s TimeCoverageRelationStatistics Valid=1461, Invalid=10529, Unknown=0, NotChecked=0, Total=11990 [2021-11-23 17:35:36,376 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 408 mSDsluCounter, 3394 mSDsCounter, 0 mSdLazyCounter, 739 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 408 SdHoareTripleChecker+Valid, 3514 SdHoareTripleChecker+Invalid, 1055 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 302 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:36,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [408 Valid, 3514 Invalid, 1055 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 739 Invalid, 0 Unknown, 302 Unchecked, 1.3s Time] [2021-11-23 17:35:36,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2047 states. [2021-11-23 17:35:36,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2047 to 1435. [2021-11-23 17:35:36,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1435 states, 1434 states have (on average 1.284518828451883) internal successors, (1842), 1434 states have internal predecessors, (1842), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:36,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1435 states to 1435 states and 1842 transitions. [2021-11-23 17:35:36,494 INFO L78 Accepts]: Start accepts. Automaton has 1435 states and 1842 transitions. Word has length 103 [2021-11-23 17:35:36,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:36,495 INFO L470 AbstractCegarLoop]: Abstraction has 1435 states and 1842 transitions. [2021-11-23 17:35:36,495 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 108 states have (on average 4.5092592592592595) internal successors, (487), 108 states have internal predecessors, (487), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:36,495 INFO L276 IsEmpty]: Start isEmpty. Operand 1435 states and 1842 transitions. [2021-11-23 17:35:36,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-23 17:35:36,496 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:36,497 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:36,506 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:36,721 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Ended with exit code 0 [2021-11-23 17:35:36,899 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (80)] Ended with exit code 0 [2021-11-23 17:35:37,100 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:37,100 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:37,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:37,101 INFO L85 PathProgramCache]: Analyzing trace with hash -523795733, now seen corresponding path program 1 times [2021-11-23 17:35:37,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:37,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [384713560] [2021-11-23 17:35:37,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:37,101 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:37,102 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:37,102 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:37,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Waiting until timeout for monitored process [2021-11-23 17:35:37,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:37,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:35:37,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:39,695 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:39,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:40,706 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:40,707 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:40,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [384713560] [2021-11-23 17:35:40,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [384713560] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:40,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [99856083] [2021-11-23 17:35:40,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:40,707 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:40,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:40,708 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:40,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (83)] Waiting until timeout for monitored process [2021-11-23 17:35:40,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:40,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:35:40,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:45,729 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:45,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:47,123 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:47,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [99856083] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:47,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [509833171] [2021-11-23 17:35:47,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:47,123 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:47,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:47,125 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:47,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2021-11-23 17:35:47,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:47,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:35:47,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:49,246 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:49,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:49,806 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:49,806 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [509833171] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:49,806 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:49,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 19, 15, 10, 9] total 67 [2021-11-23 17:35:49,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146303202] [2021-11-23 17:35:49,807 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:49,808 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-23 17:35:49,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:49,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-23 17:35:49,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=3957, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 17:35:49,810 INFO L87 Difference]: Start difference. First operand 1435 states and 1842 transitions. Second operand has 67 states, 67 states have (on average 6.91044776119403) internal successors, (463), 67 states have internal predecessors, (463), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:51,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:51,894 INFO L93 Difference]: Finished difference Result 1935 states and 2480 transitions. [2021-11-23 17:35:51,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:35:51,894 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 6.91044776119403) internal successors, (463), 67 states have internal predecessors, (463), 0 states have call successors, (0), 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 104 [2021-11-23 17:35:51,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:51,899 INFO L225 Difference]: With dead ends: 1935 [2021-11-23 17:35:51,899 INFO L226 Difference]: Without dead ends: 1505 [2021-11-23 17:35:51,900 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 643 GetRequests, 560 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2443 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=797, Invalid=6343, Unknown=0, NotChecked=0, Total=7140 [2021-11-23 17:35:51,901 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 377 mSDsluCounter, 3066 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 377 SdHoareTripleChecker+Valid, 3184 SdHoareTripleChecker+Invalid, 935 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 482 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:51,901 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [377 Valid, 3184 Invalid, 935 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 444 Invalid, 0 Unknown, 482 Unchecked, 0.4s Time] [2021-11-23 17:35:51,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1505 states. [2021-11-23 17:35:52,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1505 to 1442. [2021-11-23 17:35:52,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1442 states, 1441 states have (on average 1.2838306731436502) internal successors, (1850), 1441 states have internal predecessors, (1850), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:52,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1442 states to 1442 states and 1850 transitions. [2021-11-23 17:35:52,023 INFO L78 Accepts]: Start accepts. Automaton has 1442 states and 1850 transitions. Word has length 104 [2021-11-23 17:35:52,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:52,024 INFO L470 AbstractCegarLoop]: Abstraction has 1442 states and 1850 transitions. [2021-11-23 17:35:52,024 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 6.91044776119403) internal successors, (463), 67 states have internal predecessors, (463), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:52,024 INFO L276 IsEmpty]: Start isEmpty. Operand 1442 states and 1850 transitions. [2021-11-23 17:35:52,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-23 17:35:52,025 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:52,025 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:52,051 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:52,234 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Ended with exit code 0 [2021-11-23 17:35:52,427 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (83)] Ended with exit code 0 [2021-11-23 17:35:52,626 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:52,626 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:52,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:52,626 INFO L85 PathProgramCache]: Analyzing trace with hash 1083035275, now seen corresponding path program 1 times [2021-11-23 17:35:52,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:52,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1828290633] [2021-11-23 17:35:52,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:52,627 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:52,627 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:52,628 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:52,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (85)] Waiting until timeout for monitored process [2021-11-23 17:35:52,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:52,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:35:52,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:54,273 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:54,273 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:54,638 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:54,638 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:54,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1828290633] [2021-11-23 17:35:54,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1828290633] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:54,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [954876418] [2021-11-23 17:35:54,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:54,639 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:54,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:54,640 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:54,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (86)] Waiting until timeout for monitored process [2021-11-23 17:35:54,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:54,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:35:54,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:56,411 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:56,411 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:56,722 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:56,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [954876418] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:56,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1568894421] [2021-11-23 17:35:56,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:56,723 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:56,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:56,724 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:56,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2021-11-23 17:35:56,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:56,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:35:56,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:00,349 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:00,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:01,659 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:01,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1568894421] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:01,660 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:01,660 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 16, 14] total 42 [2021-11-23 17:36:01,660 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847333276] [2021-11-23 17:36:01,660 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:01,661 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-23 17:36:01,661 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:01,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-23 17:36:01,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=1517, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 17:36:01,662 INFO L87 Difference]: Start difference. First operand 1442 states and 1850 transitions. Second operand has 42 states, 42 states have (on average 7.928571428571429) internal successors, (333), 42 states have internal predecessors, (333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:02,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:02,037 INFO L93 Difference]: Finished difference Result 1960 states and 2538 transitions. [2021-11-23 17:36:02,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:36:02,038 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 7.928571428571429) internal successors, (333), 42 states have internal predecessors, (333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-23 17:36:02,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:02,040 INFO L225 Difference]: With dead ends: 1960 [2021-11-23 17:36:02,040 INFO L226 Difference]: Without dead ends: 1530 [2021-11-23 17:36:02,042 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 620 GetRequests, 578 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=242, Invalid=1650, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:36:02,045 INFO L933 BasicCegarLoop]: 107 mSDtfsCounter, 228 mSDsluCounter, 1955 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 2062 SdHoareTripleChecker+Invalid, 281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 142 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:02,045 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [228 Valid, 2062 Invalid, 281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 133 Invalid, 0 Unknown, 142 Unchecked, 0.1s Time] [2021-11-23 17:36:02,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1530 states. [2021-11-23 17:36:02,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1530 to 1405. [2021-11-23 17:36:02,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1405 states, 1404 states have (on average 1.2863247863247864) internal successors, (1806), 1404 states have internal predecessors, (1806), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:02,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1405 states to 1405 states and 1806 transitions. [2021-11-23 17:36:02,153 INFO L78 Accepts]: Start accepts. Automaton has 1405 states and 1806 transitions. Word has length 104 [2021-11-23 17:36:02,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:02,153 INFO L470 AbstractCegarLoop]: Abstraction has 1405 states and 1806 transitions. [2021-11-23 17:36:02,153 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 7.928571428571429) internal successors, (333), 42 states have internal predecessors, (333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:02,154 INFO L276 IsEmpty]: Start isEmpty. Operand 1405 states and 1806 transitions. [2021-11-23 17:36:02,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-11-23 17:36:02,155 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:02,155 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:36:02,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (85)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:02,361 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (86)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:02,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:02,758 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:02,758 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:02,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:02,759 INFO L85 PathProgramCache]: Analyzing trace with hash 597763373, now seen corresponding path program 1 times [2021-11-23 17:36:02,760 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:02,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [329789173] [2021-11-23 17:36:02,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:02,760 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:02,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:02,761 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:02,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (88)] Waiting until timeout for monitored process [2021-11-23 17:36:02,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:02,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:02,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:05,463 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:05,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:06,353 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:06,353 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:06,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [329789173] [2021-11-23 17:36:06,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [329789173] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:06,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2045605765] [2021-11-23 17:36:06,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:06,354 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:06,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:06,355 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:06,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (89)] Waiting until timeout for monitored process [2021-11-23 17:36:06,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:06,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:06,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:08,635 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:08,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:09,320 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:09,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2045605765] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:09,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1288867923] [2021-11-23 17:36:09,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:09,320 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:09,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:36:09,321 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:36:09,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2021-11-23 17:36:09,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:09,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:36:09,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:11,338 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:36:11,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:12,476 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:36:12,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1288867923] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:12,476 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:12,477 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:36:12,477 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546306862] [2021-11-23 17:36:12,477 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:12,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:36:12,478 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:12,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:36:12,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:36:12,479 INFO L87 Difference]: Start difference. First operand 1405 states and 1806 transitions. Second operand has 34 states, 34 states have (on average 14.764705882352942) internal successors, (502), 33 states have internal predecessors, (502), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:13,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:13,110 INFO L93 Difference]: Finished difference Result 2751 states and 3554 transitions. [2021-11-23 17:36:13,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:36:13,113 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 14.764705882352942) internal successors, (502), 33 states have internal predecessors, (502), 0 states have call successors, (0), 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 163 [2021-11-23 17:36:13,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:13,115 INFO L225 Difference]: With dead ends: 2751 [2021-11-23 17:36:13,115 INFO L226 Difference]: Without dead ends: 1449 [2021-11-23 17:36:13,116 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 985 GetRequests, 943 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=251, Invalid=1641, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:36:13,117 INFO L933 BasicCegarLoop]: 113 mSDtfsCounter, 248 mSDsluCounter, 1624 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 1737 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 126 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:13,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [248 Valid, 1737 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 63 Invalid, 0 Unknown, 126 Unchecked, 0.1s Time] [2021-11-23 17:36:13,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1449 states. [2021-11-23 17:36:13,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1449 to 1449. [2021-11-23 17:36:13,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1449 states, 1448 states have (on average 1.2810773480662982) internal successors, (1855), 1448 states have internal predecessors, (1855), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:13,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1449 states to 1449 states and 1855 transitions. [2021-11-23 17:36:13,218 INFO L78 Accepts]: Start accepts. Automaton has 1449 states and 1855 transitions. Word has length 163 [2021-11-23 17:36:13,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:13,219 INFO L470 AbstractCegarLoop]: Abstraction has 1449 states and 1855 transitions. [2021-11-23 17:36:13,219 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 14.764705882352942) internal successors, (502), 33 states have internal predecessors, (502), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:13,219 INFO L276 IsEmpty]: Start isEmpty. Operand 1449 states and 1855 transitions. [2021-11-23 17:36:13,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-11-23 17:36:13,220 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:13,220 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:36:13,223 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (89)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:13,447 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Ended with exit code 0 [2021-11-23 17:36:13,631 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (88)] Ended with exit code 0 [2021-11-23 17:36:13,822 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:36:13,822 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:13,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:13,823 INFO L85 PathProgramCache]: Analyzing trace with hash 588207423, now seen corresponding path program 1 times [2021-11-23 17:36:13,823 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:13,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [173597864] [2021-11-23 17:36:13,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:13,823 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:13,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:13,824 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:13,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (91)] Waiting until timeout for monitored process [2021-11-23 17:36:13,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:13,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:13,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:16,465 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 41 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:16,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:17,443 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 41 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:17,444 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:17,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [173597864] [2021-11-23 17:36:17,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [173597864] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:17,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1181588388] [2021-11-23 17:36:17,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:17,444 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:17,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:17,445 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:17,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (92)] Waiting until timeout for monitored process [2021-11-23 17:36:17,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:17,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:17,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:20,009 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 41 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:20,009 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:20,702 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 41 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:20,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1181588388] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:20,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [445198425] [2021-11-23 17:36:20,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:20,702 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:20,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:36:20,703 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:36:20,704 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Waiting until timeout for monitored process [2021-11-23 17:36:20,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:20,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:36:20,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:23,100 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 41 proven. 83 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:36:23,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:23,968 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 41 proven. 83 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:36:23,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [445198425] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:23,968 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:23,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:36:23,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863381840] [2021-11-23 17:36:23,969 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:23,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:36:23,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:23,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:36:23,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:36:23,970 INFO L87 Difference]: Start difference. First operand 1449 states and 1855 transitions. Second operand has 34 states, 34 states have (on average 15.117647058823529) internal successors, (514), 33 states have internal predecessors, (514), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:24,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:24,609 INFO L93 Difference]: Finished difference Result 2877 states and 3699 transitions. [2021-11-23 17:36:24,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 17:36:24,610 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 15.117647058823529) internal successors, (514), 33 states have internal predecessors, (514), 0 states have call successors, (0), 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 163 [2021-11-23 17:36:24,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:24,612 INFO L225 Difference]: With dead ends: 2877 [2021-11-23 17:36:24,612 INFO L226 Difference]: Without dead ends: 1575 [2021-11-23 17:36:24,614 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 986 GetRequests, 943 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 458 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=263, Invalid=1717, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:36:24,614 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 214 mSDsluCounter, 2387 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 2505 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 175 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:24,615 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [214 Valid, 2505 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 49 Invalid, 0 Unknown, 175 Unchecked, 0.1s Time] [2021-11-23 17:36:24,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1575 states. [2021-11-23 17:36:24,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1575 to 1571. [2021-11-23 17:36:24,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1571 states, 1570 states have (on average 1.2700636942675159) internal successors, (1994), 1570 states have internal predecessors, (1994), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:24,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1571 states to 1571 states and 1994 transitions. [2021-11-23 17:36:24,731 INFO L78 Accepts]: Start accepts. Automaton has 1571 states and 1994 transitions. Word has length 163 [2021-11-23 17:36:24,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:24,732 INFO L470 AbstractCegarLoop]: Abstraction has 1571 states and 1994 transitions. [2021-11-23 17:36:24,732 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 15.117647058823529) internal successors, (514), 33 states have internal predecessors, (514), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:24,732 INFO L276 IsEmpty]: Start isEmpty. Operand 1571 states and 1994 transitions. [2021-11-23 17:36:24,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-11-23 17:36:24,733 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:24,734 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:36:24,743 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (91)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:24,936 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (92)] Ended with exit code 0 [2021-11-23 17:36:25,160 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Ended with exit code 0 [2021-11-23 17:36:25,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:25,335 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:25,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:25,335 INFO L85 PathProgramCache]: Analyzing trace with hash -1284394593, now seen corresponding path program 1 times [2021-11-23 17:36:25,335 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:25,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2020205616] [2021-11-23 17:36:25,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:25,336 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:25,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:25,337 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:25,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (94)] Waiting until timeout for monitored process [2021-11-23 17:36:25,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:25,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:25,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:28,525 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 32 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:28,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:29,230 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 32 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:29,230 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:29,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2020205616] [2021-11-23 17:36:29,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2020205616] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:29,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2046559601] [2021-11-23 17:36:29,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:29,231 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:29,231 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:29,231 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:29,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (95)] Waiting until timeout for monitored process [2021-11-23 17:36:29,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:29,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:29,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:32,183 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 32 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:32,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:32,663 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 32 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:32,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2046559601] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:32,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1291739163] [2021-11-23 17:36:32,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:32,664 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:32,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:36:32,665 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:36:32,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Waiting until timeout for monitored process [2021-11-23 17:36:32,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:32,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:36:32,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:35,283 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 32 proven. 90 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:36:35,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:36,137 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 32 proven. 90 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:36:36,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1291739163] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:36,138 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:36,138 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:36:36,138 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001710423] [2021-11-23 17:36:36,138 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:36,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:36:36,139 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:36,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:36:36,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:36:36,140 INFO L87 Difference]: Start difference. First operand 1571 states and 1994 transitions. Second operand has 34 states, 34 states have (on average 15.558823529411764) internal successors, (529), 33 states have internal predecessors, (529), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:36,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:36,726 INFO L93 Difference]: Finished difference Result 3365 states and 4266 transitions. [2021-11-23 17:36:36,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 17:36:36,727 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 15.558823529411764) internal successors, (529), 33 states have internal predecessors, (529), 0 states have call successors, (0), 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 163 [2021-11-23 17:36:36,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:36,729 INFO L225 Difference]: With dead ends: 3365 [2021-11-23 17:36:36,729 INFO L226 Difference]: Without dead ends: 2063 [2021-11-23 17:36:36,731 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 986 GetRequests, 944 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=256, Invalid=1636, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:36:36,731 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 246 mSDsluCounter, 2166 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 2286 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 148 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:36,732 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [246 Valid, 2286 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 70 Invalid, 0 Unknown, 148 Unchecked, 0.0s Time] [2021-11-23 17:36:36,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2063 states. [2021-11-23 17:36:36,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2063 to 1823. [2021-11-23 17:36:36,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1823 states, 1822 states have (on average 1.2535675082327113) internal successors, (2284), 1822 states have internal predecessors, (2284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:36,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1823 states to 1823 states and 2284 transitions. [2021-11-23 17:36:36,862 INFO L78 Accepts]: Start accepts. Automaton has 1823 states and 2284 transitions. Word has length 163 [2021-11-23 17:36:36,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:36,862 INFO L470 AbstractCegarLoop]: Abstraction has 1823 states and 2284 transitions. [2021-11-23 17:36:36,862 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 15.558823529411764) internal successors, (529), 33 states have internal predecessors, (529), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:36,862 INFO L276 IsEmpty]: Start isEmpty. Operand 1823 states and 2284 transitions. [2021-11-23 17:36:36,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-11-23 17:36:36,865 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:36,865 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:36:36,890 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (94)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:37,080 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (95)] Ended with exit code 0 [2021-11-23 17:36:37,298 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Ended with exit code 0 [2021-11-23 17:36:37,478 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:37,479 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:37,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:37,479 INFO L85 PathProgramCache]: Analyzing trace with hash -299629905, now seen corresponding path program 1 times [2021-11-23 17:36:37,480 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:37,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [266956102] [2021-11-23 17:36:37,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:37,480 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:37,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:37,481 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:37,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (97)] Waiting until timeout for monitored process [2021-11-23 17:36:37,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:37,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:36:37,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:39,815 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 76 proven. 48 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:36:39,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:40,648 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 76 proven. 48 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:36:40,648 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:40,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [266956102] [2021-11-23 17:36:40,649 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [266956102] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:40,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [622756208] [2021-11-23 17:36:40,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:40,649 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:40,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:40,650 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:40,652 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (98)] Waiting until timeout for monitored process [2021-11-23 17:36:40,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:40,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:40,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:44,221 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 47 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:44,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:45,258 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 47 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:45,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [622756208] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:45,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1643324796] [2021-11-23 17:36:45,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:45,258 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:45,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:36:45,259 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:36:45,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Waiting until timeout for monitored process [2021-11-23 17:36:45,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:45,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:36:45,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:48,188 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 47 proven. 82 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:36:48,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:49,093 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 47 proven. 82 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:36:49,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1643324796] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:49,094 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:49,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:36:49,094 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959409433] [2021-11-23 17:36:49,094 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:49,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:36:49,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:49,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:36:49,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:36:49,096 INFO L87 Difference]: Start difference. First operand 1823 states and 2284 transitions. Second operand has 48 states, 48 states have (on average 15.333333333333334) internal successors, (736), 47 states have internal predecessors, (736), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:50,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:50,642 INFO L93 Difference]: Finished difference Result 3485 states and 4430 transitions. [2021-11-23 17:36:50,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:36:50,643 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 15.333333333333334) internal successors, (736), 47 states have internal predecessors, (736), 0 states have call successors, (0), 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 163 [2021-11-23 17:36:50,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:50,645 INFO L225 Difference]: With dead ends: 3485 [2021-11-23 17:36:50,645 INFO L226 Difference]: Without dead ends: 2183 [2021-11-23 17:36:50,647 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1001 GetRequests, 933 SyntacticMatches, 3 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1103 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=433, Invalid=3989, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 17:36:50,648 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 444 mSDsluCounter, 3463 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 444 SdHoareTripleChecker+Valid, 3585 SdHoareTripleChecker+Invalid, 335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 248 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:50,648 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [444 Valid, 3585 Invalid, 335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 80 Invalid, 0 Unknown, 248 Unchecked, 0.1s Time] [2021-11-23 17:36:50,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2183 states. [2021-11-23 17:36:50,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2183 to 2179. [2021-11-23 17:36:50,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2179 states, 2178 states have (on average 1.2502295684113867) internal successors, (2723), 2178 states have internal predecessors, (2723), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:50,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2179 states to 2179 states and 2723 transitions. [2021-11-23 17:36:50,823 INFO L78 Accepts]: Start accepts. Automaton has 2179 states and 2723 transitions. Word has length 163 [2021-11-23 17:36:50,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:50,824 INFO L470 AbstractCegarLoop]: Abstraction has 2179 states and 2723 transitions. [2021-11-23 17:36:50,838 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 15.333333333333334) internal successors, (736), 47 states have internal predecessors, (736), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:50,838 INFO L276 IsEmpty]: Start isEmpty. Operand 2179 states and 2723 transitions. [2021-11-23 17:36:50,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-11-23 17:36:50,841 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:50,841 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:36:50,853 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (98)] Ended with exit code 0 [2021-11-23 17:36:51,070 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Ended with exit code 0 [2021-11-23 17:36:51,262 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (97)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:51,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:36:51,458 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:51,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:51,458 INFO L85 PathProgramCache]: Analyzing trace with hash 244674991, now seen corresponding path program 1 times [2021-11-23 17:36:51,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:51,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1558718372] [2021-11-23 17:36:51,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:51,459 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:51,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:51,464 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:51,464 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (100)] Waiting until timeout for monitored process [2021-11-23 17:36:51,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:51,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:36:51,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:53,709 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 80 proven. 42 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:36:53,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:54,502 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 80 proven. 42 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:36:54,502 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:54,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1558718372] [2021-11-23 17:36:54,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1558718372] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:54,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1393999269] [2021-11-23 17:36:54,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:54,503 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:54,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:54,506 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:54,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (101)] Waiting until timeout for monitored process [2021-11-23 17:36:54,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:54,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:54,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:58,050 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:58,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:59,011 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:59,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1393999269] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:59,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2056909237] [2021-11-23 17:36:59,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:59,011 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:59,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:36:59,026 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:36:59,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Waiting until timeout for monitored process [2021-11-23 17:36:59,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:59,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:36:59,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:01,395 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:37:01,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:02,545 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:37:02,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2056909237] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:02,545 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:02,545 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:37:02,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114791028] [2021-11-23 17:37:02,546 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:02,546 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:37:02,547 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:02,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:37:02,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:37:02,547 INFO L87 Difference]: Start difference. First operand 2179 states and 2723 transitions. Second operand has 48 states, 48 states have (on average 15.145833333333334) internal successors, (727), 47 states have internal predecessors, (727), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:04,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:04,108 INFO L93 Difference]: Finished difference Result 4264 states and 5379 transitions. [2021-11-23 17:37:04,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:37:04,109 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 15.145833333333334) internal successors, (727), 47 states have internal predecessors, (727), 0 states have call successors, (0), 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 163 [2021-11-23 17:37:04,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:04,111 INFO L225 Difference]: With dead ends: 4264 [2021-11-23 17:37:04,112 INFO L226 Difference]: Without dead ends: 2962 [2021-11-23 17:37:04,113 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 998 GetRequests, 932 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=398, Invalid=3762, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 17:37:04,114 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 243 mSDsluCounter, 3234 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 3355 SdHoareTripleChecker+Invalid, 322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 199 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:04,114 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [243 Valid, 3355 Invalid, 322 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 116 Invalid, 0 Unknown, 199 Unchecked, 0.1s Time] [2021-11-23 17:37:04,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2962 states. [2021-11-23 17:37:04,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2962 to 2958. [2021-11-23 17:37:04,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2958 states, 2957 states have (on average 1.2411227595536016) internal successors, (3670), 2957 states have internal predecessors, (3670), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:04,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2958 states to 2958 states and 3670 transitions. [2021-11-23 17:37:04,346 INFO L78 Accepts]: Start accepts. Automaton has 2958 states and 3670 transitions. Word has length 163 [2021-11-23 17:37:04,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:04,347 INFO L470 AbstractCegarLoop]: Abstraction has 2958 states and 3670 transitions. [2021-11-23 17:37:04,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 15.145833333333334) internal successors, (727), 47 states have internal predecessors, (727), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:04,347 INFO L276 IsEmpty]: Start isEmpty. Operand 2958 states and 3670 transitions. [2021-11-23 17:37:04,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-11-23 17:37:04,351 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:04,351 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:37:04,415 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:04,575 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (100)] Ended with exit code 0 [2021-11-23 17:37:04,768 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (101)] Ended with exit code 0 [2021-11-23 17:37:04,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:04,966 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:04,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:04,967 INFO L85 PathProgramCache]: Analyzing trace with hash -1430822737, now seen corresponding path program 1 times [2021-11-23 17:37:04,967 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:04,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1505566622] [2021-11-23 17:37:04,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:04,967 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:04,967 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:04,969 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:04,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (103)] Waiting until timeout for monitored process [2021-11-23 17:37:05,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:05,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:37:05,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:07,184 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 84 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:37:07,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:07,858 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 84 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:37:07,859 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:07,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1505566622] [2021-11-23 17:37:07,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1505566622] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:07,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1033229840] [2021-11-23 17:37:07,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:07,859 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:07,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:07,860 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:07,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (104)] Waiting until timeout for monitored process [2021-11-23 17:37:08,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:08,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:37:08,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:10,930 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:10,930 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:11,859 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:11,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1033229840] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:11,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [532620780] [2021-11-23 17:37:11,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:11,860 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:11,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:11,861 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:11,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Waiting until timeout for monitored process [2021-11-23 17:37:11,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:11,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:37:11,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:14,264 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:37:14,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:15,453 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:37:15,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [532620780] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:15,453 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:15,454 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 49 [2021-11-23 17:37:15,454 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140519176] [2021-11-23 17:37:15,454 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:15,455 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-23 17:37:15,455 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:15,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-23 17:37:15,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=2242, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:37:15,456 INFO L87 Difference]: Start difference. First operand 2958 states and 3670 transitions. Second operand has 50 states, 50 states have (on average 14.6) internal successors, (730), 49 states have internal predecessors, (730), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:17,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:17,102 INFO L93 Difference]: Finished difference Result 4492 states and 5636 transitions. [2021-11-23 17:37:17,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:37:17,103 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 14.6) internal successors, (730), 49 states have internal predecessors, (730), 0 states have call successors, (0), 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 163 [2021-11-23 17:37:17,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:17,107 INFO L225 Difference]: With dead ends: 4492 [2021-11-23 17:37:17,107 INFO L226 Difference]: Without dead ends: 3190 [2021-11-23 17:37:17,109 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 997 GetRequests, 931 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1099 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=411, Invalid=4011, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 17:37:17,109 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 150 mSDsluCounter, 2632 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 2730 SdHoareTripleChecker+Invalid, 379 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 228 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:17,110 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 2730 Invalid, 379 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 142 Invalid, 0 Unknown, 228 Unchecked, 0.1s Time] [2021-11-23 17:37:17,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3190 states. [2021-11-23 17:37:17,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3190 to 3190. [2021-11-23 17:37:17,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3190 states, 3189 states have (on average 1.2323612417685794) internal successors, (3930), 3189 states have internal predecessors, (3930), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:17,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3190 states to 3190 states and 3930 transitions. [2021-11-23 17:37:17,464 INFO L78 Accepts]: Start accepts. Automaton has 3190 states and 3930 transitions. Word has length 163 [2021-11-23 17:37:17,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:17,465 INFO L470 AbstractCegarLoop]: Abstraction has 3190 states and 3930 transitions. [2021-11-23 17:37:17,465 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 14.6) internal successors, (730), 49 states have internal predecessors, (730), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:17,465 INFO L276 IsEmpty]: Start isEmpty. Operand 3190 states and 3930 transitions. [2021-11-23 17:37:17,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-11-23 17:37:17,470 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:17,470 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:37:17,495 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (103)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:17,707 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Ended with exit code 0 [2021-11-23 17:37:17,886 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (104)] Ended with exit code 0 [2021-11-23 17:37:18,084 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:18,085 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:18,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:18,085 INFO L85 PathProgramCache]: Analyzing trace with hash 1984548783, now seen corresponding path program 1 times [2021-11-23 17:37:18,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:18,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [281039546] [2021-11-23 17:37:18,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:18,086 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:18,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:18,087 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:18,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (106)] Waiting until timeout for monitored process [2021-11-23 17:37:18,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:18,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:37:18,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:20,264 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 88 proven. 30 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:37:20,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:20,865 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 88 proven. 30 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:37:20,865 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:20,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [281039546] [2021-11-23 17:37:20,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [281039546] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:20,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [280324209] [2021-11-23 17:37:20,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:20,866 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:20,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:20,866 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:20,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (107)] Waiting until timeout for monitored process [2021-11-23 17:37:21,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:21,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:37:21,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:23,965 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:23,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:24,980 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:24,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [280324209] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:24,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1480630341] [2021-11-23 17:37:24,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:24,981 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:24,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:24,982 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:24,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Waiting until timeout for monitored process [2021-11-23 17:37:25,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:25,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:37:25,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:27,308 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:37:27,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:28,524 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:37:28,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1480630341] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:28,524 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:28,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 49 [2021-11-23 17:37:28,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680426092] [2021-11-23 17:37:28,525 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:28,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-23 17:37:28,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:28,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-23 17:37:28,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=2242, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:37:28,527 INFO L87 Difference]: Start difference. First operand 3190 states and 3930 transitions. Second operand has 50 states, 50 states have (on average 14.66) internal successors, (733), 49 states have internal predecessors, (733), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:30,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:30,090 INFO L93 Difference]: Finished difference Result 4492 states and 5628 transitions. [2021-11-23 17:37:30,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:37:30,090 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 14.66) internal successors, (733), 49 states have internal predecessors, (733), 0 states have call successors, (0), 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 163 [2021-11-23 17:37:30,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:30,094 INFO L225 Difference]: With dead ends: 4492 [2021-11-23 17:37:30,094 INFO L226 Difference]: Without dead ends: 3190 [2021-11-23 17:37:30,096 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 997 GetRequests, 931 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1099 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=397, Invalid=4025, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 17:37:30,097 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 159 mSDsluCounter, 2507 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 2604 SdHoareTripleChecker+Invalid, 344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 234 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:30,098 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 2604 Invalid, 344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 105 Invalid, 0 Unknown, 234 Unchecked, 0.1s Time] [2021-11-23 17:37:30,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3190 states. [2021-11-23 17:37:30,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3190 to 3190. [2021-11-23 17:37:30,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3190 states, 3189 states have (on average 1.2298526183756664) internal successors, (3922), 3189 states have internal predecessors, (3922), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:30,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3190 states to 3190 states and 3922 transitions. [2021-11-23 17:37:30,462 INFO L78 Accepts]: Start accepts. Automaton has 3190 states and 3922 transitions. Word has length 163 [2021-11-23 17:37:30,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:30,463 INFO L470 AbstractCegarLoop]: Abstraction has 3190 states and 3922 transitions. [2021-11-23 17:37:30,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 14.66) internal successors, (733), 49 states have internal predecessors, (733), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:30,464 INFO L276 IsEmpty]: Start isEmpty. Operand 3190 states and 3922 transitions. [2021-11-23 17:37:30,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-11-23 17:37:30,468 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:30,468 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:37:30,495 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (106)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:30,684 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (107)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:30,908 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Ended with exit code 0 [2021-11-23 17:37:31,082 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:31,083 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:31,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:31,083 INFO L85 PathProgramCache]: Analyzing trace with hash 1158463151, now seen corresponding path program 1 times [2021-11-23 17:37:31,084 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:31,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [283215185] [2021-11-23 17:37:31,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:31,084 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:31,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:31,085 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:31,086 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (109)] Waiting until timeout for monitored process [2021-11-23 17:37:31,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:31,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:37:31,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:32,853 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 92 proven. 24 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:37:32,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:33,710 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 92 proven. 24 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:37:33,711 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:33,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [283215185] [2021-11-23 17:37:33,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [283215185] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:33,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1041976901] [2021-11-23 17:37:33,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:33,711 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:33,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:33,713 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:33,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (110)] Waiting until timeout for monitored process [2021-11-23 17:37:33,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:33,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:37:33,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:35,992 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:35,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:36,757 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:36,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1041976901] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:36,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1981233610] [2021-11-23 17:37:36,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:36,758 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:36,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:36,759 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:36,760 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Waiting until timeout for monitored process [2021-11-23 17:37:36,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:36,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:37:36,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:38,881 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:37:38,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:40,145 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:37:40,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1981233610] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:40,145 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:40,146 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 17:37:40,146 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986818146] [2021-11-23 17:37:40,146 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:40,147 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 17:37:40,147 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:40,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 17:37:40,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 17:37:40,148 INFO L87 Difference]: Start difference. First operand 3190 states and 3922 transitions. Second operand has 39 states, 39 states have (on average 16.256410256410255) internal successors, (634), 38 states have internal predecessors, (634), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:41,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:41,437 INFO L93 Difference]: Finished difference Result 4662 states and 5838 transitions. [2021-11-23 17:37:41,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:37:41,438 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 16.256410256410255) internal successors, (634), 38 states have internal predecessors, (634), 0 states have call successors, (0), 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 163 [2021-11-23 17:37:41,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:41,442 INFO L225 Difference]: With dead ends: 4662 [2021-11-23 17:37:41,442 INFO L226 Difference]: Without dead ends: 3360 [2021-11-23 17:37:41,444 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 994 GetRequests, 939 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=359, Invalid=2611, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:37:41,444 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 425 mSDsluCounter, 2156 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 425 SdHoareTripleChecker+Valid, 2260 SdHoareTripleChecker+Invalid, 371 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 255 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:41,445 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [425 Valid, 2260 Invalid, 371 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 110 Invalid, 0 Unknown, 255 Unchecked, 0.1s Time] [2021-11-23 17:37:41,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3360 states. [2021-11-23 17:37:41,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3360 to 3357. [2021-11-23 17:37:41,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3357 states, 3356 states have (on average 1.2252681764004767) internal successors, (4112), 3356 states have internal predecessors, (4112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:41,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3357 states to 3357 states and 4112 transitions. [2021-11-23 17:37:41,777 INFO L78 Accepts]: Start accepts. Automaton has 3357 states and 4112 transitions. Word has length 163 [2021-11-23 17:37:41,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:41,777 INFO L470 AbstractCegarLoop]: Abstraction has 3357 states and 4112 transitions. [2021-11-23 17:37:41,777 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 16.256410256410255) internal successors, (634), 38 states have internal predecessors, (634), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:41,777 INFO L276 IsEmpty]: Start isEmpty. Operand 3357 states and 4112 transitions. [2021-11-23 17:37:41,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-23 17:37:41,781 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:41,781 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:37:41,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (110)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:42,004 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:42,188 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (109)] Ended with exit code 0 [2021-11-23 17:37:42,381 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:37:42,382 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:42,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:42,382 INFO L85 PathProgramCache]: Analyzing trace with hash -1117013863, now seen corresponding path program 1 times [2021-11-23 17:37:42,383 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:42,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1539783662] [2021-11-23 17:37:42,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:42,383 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:42,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:42,384 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:42,388 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (112)] Waiting until timeout for monitored process [2021-11-23 17:37:42,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:42,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:42,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:44,253 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 41 proven. 62 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 17:37:44,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:44,756 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 41 proven. 62 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 17:37:44,756 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:44,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1539783662] [2021-11-23 17:37:44,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1539783662] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:44,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [165058665] [2021-11-23 17:37:44,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:44,757 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:44,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:44,758 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:44,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (113)] Waiting until timeout for monitored process [2021-11-23 17:37:44,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:44,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:44,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:46,723 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 41 proven. 62 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 17:37:46,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:47,092 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 41 proven. 62 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 17:37:47,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [165058665] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:47,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1343130442] [2021-11-23 17:37:47,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:47,093 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:47,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:47,094 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:47,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Waiting until timeout for monitored process [2021-11-23 17:37:47,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:47,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:47,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:48,875 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 41 proven. 62 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 17:37:48,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:49,292 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 41 proven. 62 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 17:37:49,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1343130442] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:49,292 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:49,293 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:37:49,293 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276544716] [2021-11-23 17:37:49,293 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:49,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:37:49,294 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:49,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:37:49,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:37:49,294 INFO L87 Difference]: Start difference. First operand 3357 states and 4112 transitions. Second operand has 16 states, 16 states have (on average 17.1875) internal successors, (275), 15 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:49,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:49,960 INFO L93 Difference]: Finished difference Result 6293 states and 7931 transitions. [2021-11-23 17:37:49,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:37:49,961 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 17.1875) internal successors, (275), 15 states have internal predecessors, (275), 0 states have call successors, (0), 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 164 [2021-11-23 17:37:49,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:49,965 INFO L225 Difference]: With dead ends: 6293 [2021-11-23 17:37:49,965 INFO L226 Difference]: Without dead ends: 4991 [2021-11-23 17:37:49,967 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 988 GetRequests, 966 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:37:49,968 INFO L933 BasicCegarLoop]: 140 mSDtfsCounter, 218 mSDsluCounter, 994 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 1134 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 180 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:49,968 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [218 Valid, 1134 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 92 Invalid, 0 Unknown, 180 Unchecked, 0.1s Time] [2021-11-23 17:37:49,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4991 states. [2021-11-23 17:37:50,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4991 to 4947. [2021-11-23 17:37:50,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4947 states, 4946 states have (on average 1.244237767893247) internal successors, (6154), 4946 states have internal predecessors, (6154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:50,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4947 states to 4947 states and 6154 transitions. [2021-11-23 17:37:50,428 INFO L78 Accepts]: Start accepts. Automaton has 4947 states and 6154 transitions. Word has length 164 [2021-11-23 17:37:50,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:50,429 INFO L470 AbstractCegarLoop]: Abstraction has 4947 states and 6154 transitions. [2021-11-23 17:37:50,429 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 17.1875) internal successors, (275), 15 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:50,429 INFO L276 IsEmpty]: Start isEmpty. Operand 4947 states and 6154 transitions. [2021-11-23 17:37:50,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-23 17:37:50,432 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:50,433 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:37:50,442 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (112)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:50,662 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:50,835 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (113)] Ended with exit code 0 [2021-11-23 17:37:51,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:51,034 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:51,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:51,034 INFO L85 PathProgramCache]: Analyzing trace with hash -2004851191, now seen corresponding path program 1 times [2021-11-23 17:37:51,035 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:51,035 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1361100236] [2021-11-23 17:37:51,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:51,035 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:51,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:51,036 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:51,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (115)] Waiting until timeout for monitored process [2021-11-23 17:37:51,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:51,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:37:51,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:53,254 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 76 proven. 48 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:37:53,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:54,130 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 76 proven. 48 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:37:54,130 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:54,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1361100236] [2021-11-23 17:37:54,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1361100236] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:54,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [218706882] [2021-11-23 17:37:54,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:54,131 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:54,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:54,132 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:54,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (116)] Waiting until timeout for monitored process [2021-11-23 17:37:54,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:54,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:54,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:56,370 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 17:37:56,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:56,866 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 17:37:56,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [218706882] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:56,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1369589035] [2021-11-23 17:37:56,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:56,866 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:56,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:56,867 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:56,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Waiting until timeout for monitored process [2021-11-23 17:37:56,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:56,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:56,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:58,776 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 17:37:58,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:59,270 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 17:37:59,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1369589035] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:59,270 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:59,270 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:37:59,271 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259449441] [2021-11-23 17:37:59,271 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:59,271 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:37:59,272 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:59,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:37:59,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:37:59,273 INFO L87 Difference]: Start difference. First operand 4947 states and 6154 transitions. Second operand has 32 states, 32 states have (on average 16.40625) internal successors, (525), 31 states have internal predecessors, (525), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:01,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:01,265 INFO L93 Difference]: Finished difference Result 11397 states and 14382 transitions. [2021-11-23 17:38:01,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-23 17:38:01,265 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 16.40625) internal successors, (525), 31 states have internal predecessors, (525), 0 states have call successors, (0), 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 164 [2021-11-23 17:38:01,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:01,276 INFO L225 Difference]: With dead ends: 11397 [2021-11-23 17:38:01,276 INFO L226 Difference]: Without dead ends: 10095 [2021-11-23 17:38:01,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1010 GetRequests, 956 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 652 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=334, Invalid=2528, Unknown=0, NotChecked=0, Total=2862 [2021-11-23 17:38:01,282 INFO L933 BasicCegarLoop]: 174 mSDtfsCounter, 476 mSDsluCounter, 2776 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 476 SdHoareTripleChecker+Valid, 2950 SdHoareTripleChecker+Invalid, 429 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 329 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:01,282 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [476 Valid, 2950 Invalid, 429 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 95 Invalid, 0 Unknown, 329 Unchecked, 0.1s Time] [2021-11-23 17:38:01,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10095 states. [2021-11-23 17:38:02,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10095 to 9868. [2021-11-23 17:38:02,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9868 states, 9867 states have (on average 1.2586399108138238) internal successors, (12419), 9867 states have internal predecessors, (12419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:02,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9868 states to 9868 states and 12419 transitions. [2021-11-23 17:38:02,380 INFO L78 Accepts]: Start accepts. Automaton has 9868 states and 12419 transitions. Word has length 164 [2021-11-23 17:38:02,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:02,381 INFO L470 AbstractCegarLoop]: Abstraction has 9868 states and 12419 transitions. [2021-11-23 17:38:02,381 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 16.40625) internal successors, (525), 31 states have internal predecessors, (525), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:02,381 INFO L276 IsEmpty]: Start isEmpty. Operand 9868 states and 12419 transitions. [2021-11-23 17:38:02,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-23 17:38:02,385 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:02,385 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:02,406 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Ended with exit code 0 [2021-11-23 17:38:02,590 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (116)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:02,796 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (115)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:02,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:02,986 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:02,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:02,986 INFO L85 PathProgramCache]: Analyzing trace with hash -546758135, now seen corresponding path program 1 times [2021-11-23 17:38:02,987 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:02,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [195653390] [2021-11-23 17:38:02,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:02,988 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:02,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:02,989 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:03,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (118)] Waiting until timeout for monitored process [2021-11-23 17:38:03,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:03,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:38:03,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:04,167 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 105 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:38:04,168 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:04,168 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:04,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [195653390] [2021-11-23 17:38:04,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [195653390] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:04,168 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:04,168 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:38:04,169 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755380073] [2021-11-23 17:38:04,169 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:04,169 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:38:04,170 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:04,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:38:04,170 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:38:04,170 INFO L87 Difference]: Start difference. First operand 9868 states and 12419 transitions. Second operand has 6 states, 6 states have (on average 25.0) internal successors, (150), 5 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:05,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:05,156 INFO L93 Difference]: Finished difference Result 12506 states and 15835 transitions. [2021-11-23 17:38:05,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:38:05,157 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 25.0) internal successors, (150), 5 states have internal predecessors, (150), 0 states have call successors, (0), 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 164 [2021-11-23 17:38:05,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:05,168 INFO L225 Difference]: With dead ends: 12506 [2021-11-23 17:38:05,168 INFO L226 Difference]: Without dead ends: 11204 [2021-11-23 17:38:05,171 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:38:05,172 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 117 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 364 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 65 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:05,172 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 364 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 65 Unchecked, 0.0s Time] [2021-11-23 17:38:05,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11204 states. [2021-11-23 17:38:06,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11204 to 11168. [2021-11-23 17:38:06,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11168 states, 11167 states have (on average 1.2556640100295513) internal successors, (14022), 11167 states have internal predecessors, (14022), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:06,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11168 states to 11168 states and 14022 transitions. [2021-11-23 17:38:06,331 INFO L78 Accepts]: Start accepts. Automaton has 11168 states and 14022 transitions. Word has length 164 [2021-11-23 17:38:06,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:06,332 INFO L470 AbstractCegarLoop]: Abstraction has 11168 states and 14022 transitions. [2021-11-23 17:38:06,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 25.0) internal successors, (150), 5 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:06,332 INFO L276 IsEmpty]: Start isEmpty. Operand 11168 states and 14022 transitions. [2021-11-23 17:38:06,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-23 17:38:06,338 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:06,339 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:06,351 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (118)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:06,550 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:06,550 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:06,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:06,550 INFO L85 PathProgramCache]: Analyzing trace with hash -1541603522, now seen corresponding path program 1 times [2021-11-23 17:38:06,551 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:06,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [752640177] [2021-11-23 17:38:06,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:06,551 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:06,551 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:06,552 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:06,553 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (119)] Waiting until timeout for monitored process [2021-11-23 17:38:06,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:06,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:38:06,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:09,593 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 33 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:09,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:10,278 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 33 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:10,278 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:10,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [752640177] [2021-11-23 17:38:10,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [752640177] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:10,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1897425600] [2021-11-23 17:38:10,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:10,278 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:10,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:10,279 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:10,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (120)] Waiting until timeout for monitored process [2021-11-23 17:38:10,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:10,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:38:10,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:13,733 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 33 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:13,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:14,173 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 33 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:14,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1897425600] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:14,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1984081974] [2021-11-23 17:38:14,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:14,173 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:14,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:14,174 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:14,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Waiting until timeout for monitored process [2021-11-23 17:38:14,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:14,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:38:14,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:16,731 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 33 proven. 90 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:38:16,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:17,625 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 33 proven. 90 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:38:17,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1984081974] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:17,625 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:17,626 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:38:17,626 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775089440] [2021-11-23 17:38:17,626 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:17,627 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:38:17,627 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:17,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:38:17,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:38:17,628 INFO L87 Difference]: Start difference. First operand 11168 states and 14022 transitions. Second operand has 34 states, 34 states have (on average 15.529411764705882) internal successors, (528), 33 states have internal predecessors, (528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:19,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:19,057 INFO L93 Difference]: Finished difference Result 13874 states and 17519 transitions. [2021-11-23 17:38:19,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:38:19,058 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 15.529411764705882) internal successors, (528), 33 states have internal predecessors, (528), 0 states have call successors, (0), 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 164 [2021-11-23 17:38:19,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:19,072 INFO L225 Difference]: With dead ends: 13874 [2021-11-23 17:38:19,072 INFO L226 Difference]: Without dead ends: 11216 [2021-11-23 17:38:19,077 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 991 GetRequests, 949 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=257, Invalid=1635, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:38:19,078 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 163 mSDsluCounter, 1970 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 2090 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 150 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:19,078 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 2090 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 57 Invalid, 0 Unknown, 150 Unchecked, 0.1s Time] [2021-11-23 17:38:19,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11216 states. [2021-11-23 17:38:20,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11216 to 11184. [2021-11-23 17:38:20,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11184 states, 11183 states have (on average 1.255298220513279) internal successors, (14038), 11183 states have internal predecessors, (14038), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:20,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11184 states to 11184 states and 14038 transitions. [2021-11-23 17:38:20,377 INFO L78 Accepts]: Start accepts. Automaton has 11184 states and 14038 transitions. Word has length 164 [2021-11-23 17:38:20,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:20,377 INFO L470 AbstractCegarLoop]: Abstraction has 11184 states and 14038 transitions. [2021-11-23 17:38:20,378 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 15.529411764705882) internal successors, (528), 33 states have internal predecessors, (528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:20,378 INFO L276 IsEmpty]: Start isEmpty. Operand 11184 states and 14038 transitions. [2021-11-23 17:38:20,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-23 17:38:20,384 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:20,385 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:20,406 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (119)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:20,601 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (120)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:20,826 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Ended with exit code 0 [2021-11-23 17:38:21,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:21,001 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:21,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:21,002 INFO L85 PathProgramCache]: Analyzing trace with hash 2116220798, now seen corresponding path program 1 times [2021-11-23 17:38:21,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:21,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1017301836] [2021-11-23 17:38:21,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:21,003 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:21,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:21,004 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:21,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (122)] Waiting until timeout for monitored process [2021-11-23 17:38:21,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:21,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:38:21,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:24,374 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 24 proven. 103 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:24,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:25,196 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 24 proven. 103 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:25,197 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:25,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1017301836] [2021-11-23 17:38:25,197 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1017301836] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:25,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [67748031] [2021-11-23 17:38:25,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:25,198 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:25,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:25,199 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:25,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (123)] Waiting until timeout for monitored process [2021-11-23 17:38:25,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:25,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:38:25,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:28,346 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 24 proven. 103 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:28,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:28,905 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 24 proven. 103 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:28,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [67748031] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:28,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2124530363] [2021-11-23 17:38:28,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:28,905 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:28,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:28,906 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:28,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Waiting until timeout for monitored process [2021-11-23 17:38:29,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:29,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:38:29,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:31,667 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 24 proven. 97 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:38:31,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:32,734 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 24 proven. 97 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:38:32,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2124530363] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:32,735 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:32,735 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:38:32,735 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1717408663] [2021-11-23 17:38:32,736 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:32,736 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:38:32,736 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:32,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:38:32,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:38:32,737 INFO L87 Difference]: Start difference. First operand 11184 states and 14038 transitions. Second operand has 34 states, 34 states have (on average 15.852941176470589) internal successors, (539), 33 states have internal predecessors, (539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:34,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:34,182 INFO L93 Difference]: Finished difference Result 14848 states and 18710 transitions. [2021-11-23 17:38:34,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:38:34,183 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 15.852941176470589) internal successors, (539), 33 states have internal predecessors, (539), 0 states have call successors, (0), 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 164 [2021-11-23 17:38:34,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:34,197 INFO L225 Difference]: With dead ends: 14848 [2021-11-23 17:38:34,197 INFO L226 Difference]: Without dead ends: 12190 [2021-11-23 17:38:34,201 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 992 GetRequests, 950 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=250, Invalid=1642, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:38:34,201 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 250 mSDsluCounter, 2350 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 250 SdHoareTripleChecker+Valid, 2474 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 144 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:34,202 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [250 Valid, 2474 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 48 Invalid, 0 Unknown, 144 Unchecked, 0.0s Time] [2021-11-23 17:38:34,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12190 states. [2021-11-23 17:38:35,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12190 to 12174. [2021-11-23 17:38:35,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12174 states, 12173 states have (on average 1.2493222705988662) internal successors, (15208), 12173 states have internal predecessors, (15208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:35,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12174 states to 12174 states and 15208 transitions. [2021-11-23 17:38:35,266 INFO L78 Accepts]: Start accepts. Automaton has 12174 states and 15208 transitions. Word has length 164 [2021-11-23 17:38:35,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:35,267 INFO L470 AbstractCegarLoop]: Abstraction has 12174 states and 15208 transitions. [2021-11-23 17:38:35,267 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 15.852941176470589) internal successors, (539), 33 states have internal predecessors, (539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:35,267 INFO L276 IsEmpty]: Start isEmpty. Operand 12174 states and 15208 transitions. [2021-11-23 17:38:35,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-23 17:38:35,273 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:35,274 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:35,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (122)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:35,498 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Ended with exit code 0 [2021-11-23 17:38:35,676 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (123)] Ended with exit code 0 [2021-11-23 17:38:35,874 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:35,875 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:35,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:35,875 INFO L85 PathProgramCache]: Analyzing trace with hash -1517669695, now seen corresponding path program 1 times [2021-11-23 17:38:35,875 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:35,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1743634937] [2021-11-23 17:38:35,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:35,876 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:35,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:35,877 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:35,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (125)] Waiting until timeout for monitored process [2021-11-23 17:38:35,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:36,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:38:36,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:39,194 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 24 proven. 103 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:39,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:40,005 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 24 proven. 103 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:40,006 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:40,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1743634937] [2021-11-23 17:38:40,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1743634937] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:40,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [917040610] [2021-11-23 17:38:40,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:40,006 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:40,006 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:40,008 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:40,009 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (126)] Waiting until timeout for monitored process [2021-11-23 17:38:40,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:40,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:38:40,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:44,121 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 24 proven. 103 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:44,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:44,631 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 24 proven. 103 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:44,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [917040610] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:44,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [301697945] [2021-11-23 17:38:44,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:44,632 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:44,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:44,633 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:44,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Waiting until timeout for monitored process [2021-11-23 17:38:44,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:44,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:38:44,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:47,299 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 24 proven. 97 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:38:47,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:48,347 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 24 proven. 97 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:38:48,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [301697945] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:48,348 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:48,348 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:38:48,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425174442] [2021-11-23 17:38:48,349 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:48,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:38:48,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:48,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:38:48,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:38:48,350 INFO L87 Difference]: Start difference. First operand 12174 states and 15208 transitions. Second operand has 34 states, 34 states have (on average 15.852941176470589) internal successors, (539), 33 states have internal predecessors, (539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:49,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:49,829 INFO L93 Difference]: Finished difference Result 14960 states and 18801 transitions. [2021-11-23 17:38:49,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:38:49,829 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 15.852941176470589) internal successors, (539), 33 states have internal predecessors, (539), 0 states have call successors, (0), 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 164 [2021-11-23 17:38:49,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:49,844 INFO L225 Difference]: With dead ends: 14960 [2021-11-23 17:38:49,844 INFO L226 Difference]: Without dead ends: 12302 [2021-11-23 17:38:49,849 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 991 GetRequests, 949 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=248, Invalid=1644, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:38:49,849 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 164 mSDsluCounter, 2441 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 2562 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 168 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:49,850 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [164 Valid, 2562 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 62 Invalid, 0 Unknown, 168 Unchecked, 0.0s Time] [2021-11-23 17:38:49,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12302 states. [2021-11-23 17:38:50,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12302 to 12174. [2021-11-23 17:38:50,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12174 states, 12173 states have (on average 1.2493222705988662) internal successors, (15208), 12173 states have internal predecessors, (15208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:50,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12174 states to 12174 states and 15208 transitions. [2021-11-23 17:38:50,947 INFO L78 Accepts]: Start accepts. Automaton has 12174 states and 15208 transitions. Word has length 164 [2021-11-23 17:38:50,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:50,947 INFO L470 AbstractCegarLoop]: Abstraction has 12174 states and 15208 transitions. [2021-11-23 17:38:50,947 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 15.852941176470589) internal successors, (539), 33 states have internal predecessors, (539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:50,947 INFO L276 IsEmpty]: Start isEmpty. Operand 12174 states and 15208 transitions. [2021-11-23 17:38:50,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-23 17:38:50,953 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:50,954 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:50,979 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:51,156 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (126)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:51,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (125)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:51,554 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:51,555 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:51,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:51,555 INFO L85 PathProgramCache]: Analyzing trace with hash 1530775495, now seen corresponding path program 1 times [2021-11-23 17:38:51,556 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:51,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [96544967] [2021-11-23 17:38:51,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:51,556 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:51,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:51,560 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:51,564 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (128)] Waiting until timeout for monitored process [2021-11-23 17:38:51,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:51,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:51,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:53,058 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:38:53,058 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:53,877 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:38:53,878 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:53,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [96544967] [2021-11-23 17:38:53,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [96544967] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:53,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2011070691] [2021-11-23 17:38:53,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:53,878 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:53,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:53,882 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:53,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (129)] Waiting until timeout for monitored process [2021-11-23 17:38:54,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:54,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:54,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:55,705 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:38:55,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:56,382 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:38:56,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2011070691] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:56,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [660799089] [2021-11-23 17:38:56,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:56,384 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:56,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:56,384 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:56,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (130)] Waiting until timeout for monitored process [2021-11-23 17:38:56,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:56,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:56,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:57,863 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:38:57,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:58,650 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:38:58,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [660799089] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:58,650 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:58,650 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:38:58,650 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442800727] [2021-11-23 17:38:58,651 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:58,651 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:38:58,651 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:58,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:38:58,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:38:58,652 INFO L87 Difference]: Start difference. First operand 12174 states and 15208 transitions. Second operand has 16 states, 16 states have (on average 14.8125) internal successors, (237), 15 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:00,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:00,074 INFO L93 Difference]: Finished difference Result 16308 states and 20521 transitions. [2021-11-23 17:39:00,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:39:00,075 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 14.8125) internal successors, (237), 15 states have internal predecessors, (237), 0 states have call successors, (0), 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 164 [2021-11-23 17:39:00,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:00,092 INFO L225 Difference]: With dead ends: 16308 [2021-11-23 17:39:00,092 INFO L226 Difference]: Without dead ends: 15006 [2021-11-23 17:39:00,097 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 987 GetRequests, 965 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:39:00,097 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 199 mSDsluCounter, 867 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 982 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 65 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:00,097 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [199 Valid, 982 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 35 Invalid, 0 Unknown, 65 Unchecked, 0.0s Time] [2021-11-23 17:39:00,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15006 states. [2021-11-23 17:39:01,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15006 to 14946. [2021-11-23 17:39:01,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14946 states, 14945 states have (on average 1.2532619605219137) internal successors, (18730), 14945 states have internal predecessors, (18730), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:01,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14946 states to 14946 states and 18730 transitions. [2021-11-23 17:39:01,397 INFO L78 Accepts]: Start accepts. Automaton has 14946 states and 18730 transitions. Word has length 164 [2021-11-23 17:39:01,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:01,397 INFO L470 AbstractCegarLoop]: Abstraction has 14946 states and 18730 transitions. [2021-11-23 17:39:01,397 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 14.8125) internal successors, (237), 15 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:01,397 INFO L276 IsEmpty]: Start isEmpty. Operand 14946 states and 18730 transitions. [2021-11-23 17:39:01,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-23 17:39:01,404 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:01,404 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:01,430 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (130)] Ended with exit code 0 [2021-11-23 17:39:01,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (128)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:01,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (129)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:02,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:02,006 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:02,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:02,006 INFO L85 PathProgramCache]: Analyzing trace with hash 633382217, now seen corresponding path program 1 times [2021-11-23 17:39:02,006 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:02,007 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1587820833] [2021-11-23 17:39:02,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:02,007 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:02,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:02,008 INFO L229 MonitoredProcess]: Starting monitored process 131 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:02,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (131)] Waiting until timeout for monitored process [2021-11-23 17:39:02,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:02,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:39:02,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:03,173 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 114 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:39:03,174 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:39:03,174 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:03,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1587820833] [2021-11-23 17:39:03,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1587820833] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:39:03,174 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:39:03,174 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:39:03,174 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322545612] [2021-11-23 17:39:03,174 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:39:03,175 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:39:03,175 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:03,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:39:03,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:39:03,175 INFO L87 Difference]: Start difference. First operand 14946 states and 18730 transitions. Second operand has 6 states, 6 states have (on average 25.666666666666668) internal successors, (154), 5 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:04,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:04,653 INFO L93 Difference]: Finished difference Result 18938 states and 23897 transitions. [2021-11-23 17:39:04,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:39:04,654 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 25.666666666666668) internal successors, (154), 5 states have internal predecessors, (154), 0 states have call successors, (0), 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 164 [2021-11-23 17:39:04,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:04,674 INFO L225 Difference]: With dead ends: 18938 [2021-11-23 17:39:04,674 INFO L226 Difference]: Without dead ends: 17636 [2021-11-23 17:39:04,678 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:39:04,678 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 107 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 53 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:04,678 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 328 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 53 Unchecked, 0.0s Time] [2021-11-23 17:39:04,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17636 states. [2021-11-23 17:39:06,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17636 to 17634. [2021-11-23 17:39:06,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17634 states, 17633 states have (on average 1.2532751091703056) internal successors, (22099), 17633 states have internal predecessors, (22099), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:06,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17634 states to 17634 states and 22099 transitions. [2021-11-23 17:39:06,412 INFO L78 Accepts]: Start accepts. Automaton has 17634 states and 22099 transitions. Word has length 164 [2021-11-23 17:39:06,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:06,412 INFO L470 AbstractCegarLoop]: Abstraction has 17634 states and 22099 transitions. [2021-11-23 17:39:06,412 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 25.666666666666668) internal successors, (154), 5 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:06,412 INFO L276 IsEmpty]: Start isEmpty. Operand 17634 states and 22099 transitions. [2021-11-23 17:39:06,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-23 17:39:06,419 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:06,420 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:06,429 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (131)] Ended with exit code 0 [2021-11-23 17:39:06,622 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 131 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:39:06,622 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:06,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:06,623 INFO L85 PathProgramCache]: Analyzing trace with hash 1177687113, now seen corresponding path program 1 times [2021-11-23 17:39:06,623 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:06,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1811119333] [2021-11-23 17:39:06,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:06,624 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:06,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:06,632 INFO L229 MonitoredProcess]: Starting monitored process 132 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:06,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (132)] Waiting until timeout for monitored process [2021-11-23 17:39:06,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:06,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:39:06,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:08,927 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 81 proven. 42 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:39:08,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:09,741 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 81 proven. 42 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:39:09,741 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:09,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1811119333] [2021-11-23 17:39:09,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1811119333] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:09,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [893250250] [2021-11-23 17:39:09,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:09,741 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:09,742 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:09,742 INFO L229 MonitoredProcess]: Starting monitored process 133 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:09,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (133)] Waiting until timeout for monitored process [2021-11-23 17:39:09,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:09,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:39:09,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:11,636 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:39:11,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:12,479 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:39:12,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [893250250] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:12,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2126145229] [2021-11-23 17:39:12,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:12,480 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:12,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:12,481 INFO L229 MonitoredProcess]: Starting monitored process 134 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:12,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Waiting until timeout for monitored process [2021-11-23 17:39:12,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:12,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:39:12,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:13,943 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:39:13,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:14,710 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:39:14,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2126145229] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:14,710 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:39:14,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:39:14,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837985511] [2021-11-23 17:39:14,711 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:39:14,712 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:39:14,712 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:14,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:39:14,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:39:14,712 INFO L87 Difference]: Start difference. First operand 17634 states and 22099 transitions. Second operand has 32 states, 32 states have (on average 14.5625) internal successors, (466), 31 states have internal predecessors, (466), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:17,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:17,686 INFO L93 Difference]: Finished difference Result 26857 states and 33743 transitions. [2021-11-23 17:39:17,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:39:17,686 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 14.5625) internal successors, (466), 31 states have internal predecessors, (466), 0 states have call successors, (0), 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 164 [2021-11-23 17:39:17,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:17,716 INFO L225 Difference]: With dead ends: 26857 [2021-11-23 17:39:17,716 INFO L226 Difference]: Without dead ends: 24255 [2021-11-23 17:39:17,725 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1005 GetRequests, 953 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=313, Invalid=2339, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 17:39:17,725 INFO L933 BasicCegarLoop]: 143 mSDtfsCounter, 302 mSDsluCounter, 2744 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 302 SdHoareTripleChecker+Valid, 2887 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 359 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:17,726 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [302 Valid, 2887 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 133 Invalid, 0 Unknown, 359 Unchecked, 0.1s Time] [2021-11-23 17:39:17,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24255 states. [2021-11-23 17:39:20,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24255 to 24179. [2021-11-23 17:39:20,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24179 states, 24178 states have (on average 1.251261477376127) internal successors, (30253), 24178 states have internal predecessors, (30253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:20,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24179 states to 24179 states and 30253 transitions. [2021-11-23 17:39:20,148 INFO L78 Accepts]: Start accepts. Automaton has 24179 states and 30253 transitions. Word has length 164 [2021-11-23 17:39:20,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:20,148 INFO L470 AbstractCegarLoop]: Abstraction has 24179 states and 30253 transitions. [2021-11-23 17:39:20,148 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 14.5625) internal successors, (466), 31 states have internal predecessors, (466), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:20,148 INFO L276 IsEmpty]: Start isEmpty. Operand 24179 states and 30253 transitions. [2021-11-23 17:39:20,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-23 17:39:20,158 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:20,158 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:20,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (132)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:20,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (133)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:20,579 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Ended with exit code 0 [2021-11-23 17:39:20,759 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 132 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,133 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,134 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:20,759 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:20,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:20,759 INFO L85 PathProgramCache]: Analyzing trace with hash -497810615, now seen corresponding path program 1 times [2021-11-23 17:39:20,760 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:20,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [407331846] [2021-11-23 17:39:20,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:20,760 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:20,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:20,761 INFO L229 MonitoredProcess]: Starting monitored process 135 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:20,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (135)] Waiting until timeout for monitored process [2021-11-23 17:39:20,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:20,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:39:20,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:23,010 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 85 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:39:23,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:23,651 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 85 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:39:23,651 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:23,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [407331846] [2021-11-23 17:39:23,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [407331846] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:23,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1943630014] [2021-11-23 17:39:23,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:23,652 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:23,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:23,652 INFO L229 MonitoredProcess]: Starting monitored process 136 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:23,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (136)] Waiting until timeout for monitored process [2021-11-23 17:39:23,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:23,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:39:23,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:25,463 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:39:25,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:26,270 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:39:26,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1943630014] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:26,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2136184451] [2021-11-23 17:39:26,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:26,270 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:26,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:26,271 INFO L229 MonitoredProcess]: Starting monitored process 137 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:26,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (137)] Waiting until timeout for monitored process [2021-11-23 17:39:26,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:26,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:39:26,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:27,499 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:39:27,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:28,176 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:39:28,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2136184451] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:28,176 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:39:28,176 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:39:28,176 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839441379] [2021-11-23 17:39:28,177 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:39:28,177 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:39:28,177 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:28,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:39:28,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:39:28,178 INFO L87 Difference]: Start difference. First operand 24179 states and 30253 transitions. Second operand has 32 states, 32 states have (on average 14.65625) internal successors, (469), 31 states have internal predecessors, (469), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:31,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:31,481 INFO L93 Difference]: Finished difference Result 31471 states and 39300 transitions. [2021-11-23 17:39:31,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:39:31,481 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 14.65625) internal successors, (469), 31 states have internal predecessors, (469), 0 states have call successors, (0), 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 164 [2021-11-23 17:39:31,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:31,516 INFO L225 Difference]: With dead ends: 31471 [2021-11-23 17:39:31,516 INFO L226 Difference]: Without dead ends: 30169 [2021-11-23 17:39:31,524 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1014 GetRequests, 958 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 701 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=341, Invalid=2739, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 17:39:31,524 INFO L933 BasicCegarLoop]: 142 mSDtfsCounter, 423 mSDsluCounter, 2509 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 423 SdHoareTripleChecker+Valid, 2651 SdHoareTripleChecker+Invalid, 342 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 248 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:31,525 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [423 Valid, 2651 Invalid, 342 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 87 Invalid, 0 Unknown, 248 Unchecked, 0.1s Time] [2021-11-23 17:39:31,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30169 states. [2021-11-23 17:39:33,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30169 to 29523. [2021-11-23 17:39:33,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29523 states, 29522 states have (on average 1.251202493056026) internal successors, (36938), 29522 states have internal predecessors, (36938), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:34,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29523 states to 29523 states and 36938 transitions. [2021-11-23 17:39:34,028 INFO L78 Accepts]: Start accepts. Automaton has 29523 states and 36938 transitions. Word has length 164 [2021-11-23 17:39:34,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:34,029 INFO L470 AbstractCegarLoop]: Abstraction has 29523 states and 36938 transitions. [2021-11-23 17:39:34,029 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 14.65625) internal successors, (469), 31 states have internal predecessors, (469), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:34,029 INFO L276 IsEmpty]: Start isEmpty. Operand 29523 states and 36938 transitions. [2021-11-23 17:39:34,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-23 17:39:34,037 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:34,038 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:34,039 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (136)] Ended with exit code 0 [2021-11-23 17:39:34,263 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (137)] Ended with exit code 0 [2021-11-23 17:39:34,446 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (135)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:34,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 136 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,137 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,135 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:39:34,640 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:34,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:34,640 INFO L85 PathProgramCache]: Analyzing trace with hash -1377406391, now seen corresponding path program 1 times [2021-11-23 17:39:34,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:34,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1902468821] [2021-11-23 17:39:34,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:34,641 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:34,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:34,642 INFO L229 MonitoredProcess]: Starting monitored process 138 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:34,643 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (138)] Waiting until timeout for monitored process [2021-11-23 17:39:34,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:34,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:39:34,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:36,544 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 89 proven. 30 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:39:36,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:37,088 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 89 proven. 30 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:39:37,088 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:37,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1902468821] [2021-11-23 17:39:37,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1902468821] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:37,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [279574120] [2021-11-23 17:39:37,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:37,088 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:37,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:37,089 INFO L229 MonitoredProcess]: Starting monitored process 139 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:37,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (139)] Waiting until timeout for monitored process [2021-11-23 17:39:37,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:37,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:39:37,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:38,754 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:39:38,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:39,733 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:39:39,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [279574120] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:39,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282508625] [2021-11-23 17:39:39,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:39,734 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:39,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:39,735 INFO L229 MonitoredProcess]: Starting monitored process 140 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:39,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (140)] Waiting until timeout for monitored process [2021-11-23 17:39:39,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:39,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:39:39,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:40,957 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:39:40,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:41,580 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:39:41,581 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282508625] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:41,581 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:39:41,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:39:41,581 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163214569] [2021-11-23 17:39:41,581 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:39:41,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:39:41,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:41,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:39:41,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:39:41,583 INFO L87 Difference]: Start difference. First operand 29523 states and 36938 transitions. Second operand has 32 states, 32 states have (on average 14.75) internal successors, (472), 31 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 17:39:48,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:48,680 INFO L93 Difference]: Finished difference Result 57872 states and 73062 transitions. [2021-11-23 17:39:48,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-11-23 17:39:48,680 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 14.75) internal successors, (472), 31 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 164 [2021-11-23 17:39:48,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:48,750 INFO L225 Difference]: With dead ends: 57872 [2021-11-23 17:39:48,750 INFO L226 Difference]: Without dead ends: 50168 [2021-11-23 17:39:48,764 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1085 GetRequests, 964 SyntacticMatches, 2 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5005 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1218, Invalid=13302, Unknown=0, NotChecked=0, Total=14520 [2021-11-23 17:39:48,764 INFO L933 BasicCegarLoop]: 176 mSDtfsCounter, 661 mSDsluCounter, 3125 mSDsCounter, 0 mSdLazyCounter, 824 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 661 SdHoareTripleChecker+Valid, 3301 SdHoareTripleChecker+Invalid, 1951 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 824 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1076 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:48,765 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [661 Valid, 3301 Invalid, 1951 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 824 Invalid, 0 Unknown, 1076 Unchecked, 0.6s Time] [2021-11-23 17:39:48,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50168 states. [2021-11-23 17:39:50,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50168 to 20938. [2021-11-23 17:39:50,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20938 states, 20937 states have (on average 1.242680422219038) internal successors, (26018), 20937 states have internal predecessors, (26018), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:50,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20938 states to 20938 states and 26018 transitions. [2021-11-23 17:39:50,821 INFO L78 Accepts]: Start accepts. Automaton has 20938 states and 26018 transitions. Word has length 164 [2021-11-23 17:39:50,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:50,821 INFO L470 AbstractCegarLoop]: Abstraction has 20938 states and 26018 transitions. [2021-11-23 17:39:50,822 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 14.75) internal successors, (472), 31 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 17:39:50,822 INFO L276 IsEmpty]: Start isEmpty. Operand 20938 states and 26018 transitions. [2021-11-23 17:39:50,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-23 17:39:50,829 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:50,829 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:50,842 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (138)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:51,032 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (139)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:51,254 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (140)] Ended with exit code 0 [2021-11-23 17:39:51,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 138 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,139 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,140 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:51,430 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:51,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:51,431 INFO L85 PathProgramCache]: Analyzing trace with hash 2081919323, now seen corresponding path program 1 times [2021-11-23 17:39:51,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:51,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1087875045] [2021-11-23 17:39:51,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:51,431 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:51,432 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:51,432 INFO L229 MonitoredProcess]: Starting monitored process 141 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:51,433 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (141)] Waiting until timeout for monitored process [2021-11-23 17:39:51,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:51,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:39:51,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:53,082 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 90 proven. 24 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:39:53,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:53,827 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 90 proven. 24 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:39:53,827 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:53,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1087875045] [2021-11-23 17:39:53,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1087875045] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:53,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1243197936] [2021-11-23 17:39:53,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:53,828 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:53,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:53,828 INFO L229 MonitoredProcess]: Starting monitored process 142 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:53,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (142)] Waiting until timeout for monitored process [2021-11-23 17:39:53,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:53,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:39:53,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:57,713 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 34 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:57,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:58,381 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 34 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:58,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1243197936] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:58,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [246301062] [2021-11-23 17:39:58,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:58,381 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:58,381 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:58,382 INFO L229 MonitoredProcess]: Starting monitored process 143 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:58,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (143)] Waiting until timeout for monitored process [2021-11-23 17:39:58,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:58,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:39:58,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:01,092 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 34 proven. 89 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:40:01,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:02,004 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 34 proven. 89 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:40:02,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [246301062] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:02,005 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:40:02,005 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:40:02,006 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942828900] [2021-11-23 17:40:02,006 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:40:02,006 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:40:02,007 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:40:02,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:40:02,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:40:02,007 INFO L87 Difference]: Start difference. First operand 20938 states and 26018 transitions. Second operand has 48 states, 48 states have (on average 15.916666666666666) internal successors, (764), 47 states have internal predecessors, (764), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:04,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:40:04,937 INFO L93 Difference]: Finished difference Result 29214 states and 36472 transitions. [2021-11-23 17:40:04,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 17:40:04,938 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 15.916666666666666) internal successors, (764), 47 states have internal predecessors, (764), 0 states have call successors, (0), 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 164 [2021-11-23 17:40:04,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:40:04,960 INFO L225 Difference]: With dead ends: 29214 [2021-11-23 17:40:04,960 INFO L226 Difference]: Without dead ends: 21744 [2021-11-23 17:40:04,970 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1004 GetRequests, 937 SyntacticMatches, 3 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1079 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=429, Invalid=3861, Unknown=0, NotChecked=0, Total=4290 [2021-11-23 17:40:04,971 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 286 mSDsluCounter, 3163 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 286 SdHoareTripleChecker+Valid, 3290 SdHoareTripleChecker+Invalid, 727 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 544 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:40:04,971 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [286 Valid, 3290 Invalid, 727 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 172 Invalid, 0 Unknown, 544 Unchecked, 0.1s Time] [2021-11-23 17:40:04,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21744 states. [2021-11-23 17:40:06,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21744 to 21656. [2021-11-23 17:40:06,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21656 states, 21655 states have (on average 1.2421149849919186) internal successors, (26898), 21655 states have internal predecessors, (26898), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:06,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21656 states to 21656 states and 26898 transitions. [2021-11-23 17:40:06,955 INFO L78 Accepts]: Start accepts. Automaton has 21656 states and 26898 transitions. Word has length 164 [2021-11-23 17:40:06,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:40:06,955 INFO L470 AbstractCegarLoop]: Abstraction has 21656 states and 26898 transitions. [2021-11-23 17:40:06,956 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 15.916666666666666) internal successors, (764), 47 states have internal predecessors, (764), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:06,956 INFO L276 IsEmpty]: Start isEmpty. Operand 21656 states and 26898 transitions. [2021-11-23 17:40:06,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-23 17:40:06,963 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:40:06,964 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 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, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:40:06,972 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (141)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:07,165 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (142)] Ended with exit code 0 [2021-11-23 17:40:07,385 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (143)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:07,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 141 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,142 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,143 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:07,564 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:40:07,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:40:07,565 INFO L85 PathProgramCache]: Analyzing trace with hash -1925002686, now seen corresponding path program 1 times [2021-11-23 17:40:07,565 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:40:07,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [925676873] [2021-11-23 17:40:07,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:07,565 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:40:07,565 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:40:07,566 INFO L229 MonitoredProcess]: Starting monitored process 144 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:40:07,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (144)] Waiting until timeout for monitored process [2021-11-23 17:40:07,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:07,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:40:07,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:08,706 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 108 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:40:08,706 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:40:08,706 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:40:08,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [925676873] [2021-11-23 17:40:08,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [925676873] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:40:08,706 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:40:08,706 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:40:08,707 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201016561] [2021-11-23 17:40:08,707 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:40:08,707 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:40:08,707 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:40:08,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:40:08,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:40:08,708 INFO L87 Difference]: Start difference. First operand 21656 states and 26898 transitions. Second operand has 6 states, 6 states have (on average 25.833333333333332) internal successors, (155), 5 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:11,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:40:11,777 INFO L93 Difference]: Finished difference Result 51161 states and 63749 transitions. [2021-11-23 17:40:11,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:40:11,778 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 25.833333333333332) internal successors, (155), 5 states have internal predecessors, (155), 0 states have call successors, (0), 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 164 [2021-11-23 17:40:11,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:40:11,823 INFO L225 Difference]: With dead ends: 51161 [2021-11-23 17:40:11,823 INFO L226 Difference]: Without dead ends: 38923 [2021-11-23 17:40:11,837 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:40:11,837 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 98 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 368 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 62 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:40:11,838 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 368 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 62 Unchecked, 0.0s Time] [2021-11-23 17:40:11,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38923 states. [2021-11-23 17:40:15,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38923 to 38629. [2021-11-23 17:40:15,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38629 states, 38628 states have (on average 1.2321890856373614) internal successors, (47597), 38628 states have internal predecessors, (47597), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:15,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38629 states to 38629 states and 47597 transitions. [2021-11-23 17:40:15,193 INFO L78 Accepts]: Start accepts. Automaton has 38629 states and 47597 transitions. Word has length 164 [2021-11-23 17:40:15,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:40:15,194 INFO L470 AbstractCegarLoop]: Abstraction has 38629 states and 47597 transitions. [2021-11-23 17:40:15,194 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 25.833333333333332) internal successors, (155), 5 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:15,194 INFO L276 IsEmpty]: Start isEmpty. Operand 38629 states and 47597 transitions. [2021-11-23 17:40:15,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-23 17:40:15,200 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:40:15,200 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 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, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:40:15,210 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (144)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:15,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 144 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:40:15,401 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:40:15,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:40:15,401 INFO L85 PathProgramCache]: Analyzing trace with hash -684430309, now seen corresponding path program 1 times [2021-11-23 17:40:15,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:40:15,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1696688509] [2021-11-23 17:40:15,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:15,402 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:40:15,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:40:15,403 INFO L229 MonitoredProcess]: Starting monitored process 145 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:40:15,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cca63a99-2778-4c52-9454-f56d99158141/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (145)] Waiting until timeout for monitored process [2021-11-23 17:40:15,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:15,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:40:15,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:16,383 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 106 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 17:40:16,383 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:40:16,383 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:40:16,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1696688509] [2021-11-23 17:40:16,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1696688509] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:40:16,384 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:40:16,384 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:40:16,384 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763934000] [2021-11-23 17:40:16,384 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:40:16,384 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:40:16,384 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:40:16,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:40:16,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:40:16,385 INFO L87 Difference]: Start difference. First operand 38629 states and 47597 transitions. Second operand has 6 states, 6 states have (on average 25.666666666666668) internal successors, (154), 5 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:22,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:40:22,706 INFO L93 Difference]: Finished difference Result 92635 states and 114330 transitions. [2021-11-23 17:40:22,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:40:22,707 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 25.666666666666668) internal successors, (154), 5 states have internal predecessors, (154), 0 states have call successors, (0), 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 164 [2021-11-23 17:40:22,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:40:22,805 INFO L225 Difference]: With dead ends: 92635 [2021-11-23 17:40:22,805 INFO L226 Difference]: Without dead ends: 71564 [2021-11-23 17:40:22,824 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:40:22,824 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 90 mSDsluCounter, 316 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 446 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 99 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:40:22,825 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 446 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 99 Unchecked, 0.0s Time] [2021-11-23 17:40:22,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71564 states.