./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/down.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/down.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P --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 d487f6cb836d5c7294168f7ececc6a4515780c0860389f79570a9c0e20e7bcc0 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:01:42,706 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:01:42,709 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:01:42,748 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:01:42,749 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:01:42,751 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:01:42,753 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:01:42,757 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:01:42,760 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:01:42,761 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:01:42,763 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:01:42,765 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:01:42,766 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:01:42,768 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:01:42,770 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:01:42,772 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:01:42,774 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:01:42,776 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:01:42,779 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:01:42,783 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:01:42,786 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:01:42,791 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:01:42,793 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:01:42,794 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:01:42,799 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:01:42,800 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:01:42,801 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:01:42,802 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:01:42,803 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:01:42,804 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:01:42,805 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:01:42,806 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:01:42,808 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:01:42,809 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:01:42,811 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:01:42,811 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:01:42,812 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:01:42,812 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:01:42,813 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:01:42,814 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:01:42,815 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:01:42,816 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:01:42,849 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:01:42,850 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:01:42,850 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:01:42,857 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:01:42,858 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:01:42,858 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:01:42,858 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:01:42,859 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:01:42,859 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:01:42,859 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:01:42,860 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:01:42,860 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:01:42,860 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:01:42,861 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:01:42,861 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:01:42,861 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:01:42,862 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:01:42,862 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:01:42,863 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:01:42,863 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:01:42,864 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:01:42,864 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:01:42,864 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:01:42,865 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:01:42,865 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:01:42,865 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:01:42,866 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:01:42,866 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:01:42,866 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:01:42,866 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:01:42,867 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:01:42,867 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:01:42,867 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:01:42,868 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:01:42,868 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:01:42,868 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:01:42,869 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:01:42,869 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:01:42,869 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:01:42,870 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:01:42,870 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:01:42,870 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_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d487f6cb836d5c7294168f7ececc6a4515780c0860389f79570a9c0e20e7bcc0 [2021-11-21 01:01:43,165 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:01:43,192 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:01:43,196 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:01:43,197 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:01:43,199 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:01:43,200 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/loop-invgen/down.i [2021-11-21 01:01:43,276 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/data/a6f69c394/60b34b161c4f472c9a375cbddbf393a9/FLAG4f7f202d0 [2021-11-21 01:01:43,839 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:01:43,840 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/sv-benchmarks/c/loop-invgen/down.i [2021-11-21 01:01:43,848 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/data/a6f69c394/60b34b161c4f472c9a375cbddbf393a9/FLAG4f7f202d0 [2021-11-21 01:01:44,203 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/data/a6f69c394/60b34b161c4f472c9a375cbddbf393a9 [2021-11-21 01:01:44,207 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:01:44,209 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:01:44,213 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:01:44,216 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:01:44,220 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:01:44,220 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:01:44" (1/1) ... [2021-11-21 01:01:44,221 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2232f3ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:01:44, skipping insertion in model container [2021-11-21 01:01:44,221 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:01:44" (1/1) ... [2021-11-21 01:01:44,229 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:01:44,246 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:01:44,466 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_6d947126-f918-45eb-82a9-a45088f341e7/sv-benchmarks/c/loop-invgen/down.i[893,906] [2021-11-21 01:01:44,479 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:01:44,490 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:01:44,506 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_6d947126-f918-45eb-82a9-a45088f341e7/sv-benchmarks/c/loop-invgen/down.i[893,906] [2021-11-21 01:01:44,511 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:01:44,528 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:01:44,529 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:01:44 WrapperNode [2021-11-21 01:01:44,529 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:01:44,530 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:01:44,531 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:01:44,531 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:01:44,541 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:01:44" (1/1) ... [2021-11-21 01:01:44,549 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:01:44" (1/1) ... [2021-11-21 01:01:44,572 INFO L137 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 45 [2021-11-21 01:01:44,573 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:01:44,574 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:01:44,574 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:01:44,574 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:01:44,585 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:01:44" (1/1) ... [2021-11-21 01:01:44,585 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:01:44" (1/1) ... [2021-11-21 01:01:44,587 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:01:44" (1/1) ... [2021-11-21 01:01:44,587 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:01:44" (1/1) ... [2021-11-21 01:01:44,591 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:01:44" (1/1) ... [2021-11-21 01:01:44,596 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:01:44" (1/1) ... [2021-11-21 01:01:44,597 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:01:44" (1/1) ... [2021-11-21 01:01:44,599 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:01:44,601 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:01:44,601 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:01:44,601 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:01:44,603 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:01:44" (1/1) ... [2021-11-21 01:01:44,619 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:01:44,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:01:44,659 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:01:44,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:01:44,727 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:01:44,727 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:01:44,727 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:01:44,728 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:01:44,824 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:01:44,826 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:01:44,977 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:01:45,001 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:01:45,001 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 01:01:45,004 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:01:45 BoogieIcfgContainer [2021-11-21 01:01:45,005 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:01:45,007 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:01:45,007 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:01:45,011 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:01:45,012 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:01:44" (1/3) ... [2021-11-21 01:01:45,013 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51a2c48a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:01:45, skipping insertion in model container [2021-11-21 01:01:45,013 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:01:44" (2/3) ... [2021-11-21 01:01:45,014 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51a2c48a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:01:45, skipping insertion in model container [2021-11-21 01:01:45,014 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:01:45" (3/3) ... [2021-11-21 01:01:45,015 INFO L111 eAbstractionObserver]: Analyzing ICFG down.i [2021-11-21 01:01:45,022 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:01:45,022 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:01:45,088 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:01:45,098 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 [2021-11-21 01:01:45,098 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:01:45,116 INFO L276 IsEmpty]: Start isEmpty. Operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:45,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 01:01:45,123 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:01:45,124 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-21 01:01:45,125 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:01:45,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:01:45,132 INFO L85 PathProgramCache]: Analyzing trace with hash 69824243, now seen corresponding path program 1 times [2021-11-21 01:01:45,145 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:01:45,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [42194017] [2021-11-21 01:01:45,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:01:45,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:01:45,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:01:45,345 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:45,346 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:01:45,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [42194017] [2021-11-21 01:01:45,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [42194017] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:01:45,348 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:01:45,348 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:01:45,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106518259] [2021-11-21 01:01:45,351 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:01:45,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:01:45,357 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:01:45,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:01:45,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:01:45,393 INFO L87 Difference]: Start difference. First operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 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 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:45,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:01:45,503 INFO L93 Difference]: Finished difference Result 17 states and 21 transitions. [2021-11-21 01:01:45,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:01:45,506 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 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 5 [2021-11-21 01:01:45,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:01:45,516 INFO L225 Difference]: With dead ends: 17 [2021-11-21 01:01:45,520 INFO L226 Difference]: Without dead ends: 8 [2021-11-21 01:01:45,524 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:01:45,530 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 3 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:01:45,532 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 13 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:01:45,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2021-11-21 01:01:45,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2021-11-21 01:01:45,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:45,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2021-11-21 01:01:45,593 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 5 [2021-11-21 01:01:45,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:01:45,594 INFO L470 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2021-11-21 01:01:45,594 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:45,595 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2021-11-21 01:01:45,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 01:01:45,595 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:01:45,596 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-21 01:01:45,596 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:01:45,597 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:01:45,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:01:45,598 INFO L85 PathProgramCache]: Analyzing trace with hash 2130199594, now seen corresponding path program 1 times [2021-11-21 01:01:45,598 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:01:45,599 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1338859494] [2021-11-21 01:01:45,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:01:45,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:01:45,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:01:45,707 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:45,708 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:01:45,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1338859494] [2021-11-21 01:01:45,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1338859494] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:01:45,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1440713331] [2021-11-21 01:01:45,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:01:45,710 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:01:45,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:01:45,712 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:01:45,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:01:45,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:01:45,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:01:45,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:01:45,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:45,931 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:01:45,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1440713331] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:01:45,932 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:01:45,932 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-21 01:01:45,933 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135058004] [2021-11-21 01:01:45,934 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:01:45,934 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:01:45,935 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:01:45,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:01:45,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:01:45,936 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:46,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:01:46,031 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2021-11-21 01:01:46,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:01:46,034 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 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 6 [2021-11-21 01:01:46,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:01:46,035 INFO L225 Difference]: With dead ends: 18 [2021-11-21 01:01:46,035 INFO L226 Difference]: Without dead ends: 16 [2021-11-21 01:01:46,036 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:01:46,038 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 9 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:01:46,039 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 9 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:01:46,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-21 01:01:46,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 10. [2021-11-21 01:01:46,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:46,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2021-11-21 01:01:46,045 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 6 [2021-11-21 01:01:46,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:01:46,053 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2021-11-21 01:01:46,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:46,054 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2021-11-21 01:01:46,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-21 01:01:46,055 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:01:46,056 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:01:46,097 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:01:46,277 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:01:46,278 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:01:46,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:01:46,279 INFO L85 PathProgramCache]: Analyzing trace with hash -1655840561, now seen corresponding path program 1 times [2021-11-21 01:01:46,279 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:01:46,279 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [571392461] [2021-11-21 01:01:46,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:01:46,279 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:01:46,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:01:46,351 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:46,351 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:01:46,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [571392461] [2021-11-21 01:01:46,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [571392461] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:01:46,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1717839569] [2021-11-21 01:01:46,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:01:46,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:01:46,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:01:46,354 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:01:46,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:01:46,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:01:46,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:01:46,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:01:46,502 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:46,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:01:46,571 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:46,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1717839569] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:01:46,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1244217923] [2021-11-21 01:01:46,598 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:01:46,598 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:01:46,604 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:01:46,611 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:01:46,612 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:01:48,187 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:01:48,426 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:01:48,427 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:01:48,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 6 [2021-11-21 01:01:48,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824930222] [2021-11-21 01:01:48,428 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:01:48,428 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:01:48,428 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:01:48,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:01:48,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-11-21 01:01:48,430 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:48,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:01:48,493 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2021-11-21 01:01:48,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:01:48,494 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 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 9 [2021-11-21 01:01:48,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:01:48,494 INFO L225 Difference]: With dead ends: 20 [2021-11-21 01:01:48,495 INFO L226 Difference]: Without dead ends: 11 [2021-11-21 01:01:48,498 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:01:48,503 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:01:48,505 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 16 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:01:48,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-11-21 01:01:48,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-11-21 01:01:48,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:48,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2021-11-21 01:01:48,516 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 9 [2021-11-21 01:01:48,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:01:48,517 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2021-11-21 01:01:48,518 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:48,519 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2021-11-21 01:01:48,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-21 01:01:48,520 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:01:48,520 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2021-11-21 01:01:48,568 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-21 01:01:48,745 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:01:48,746 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:01:48,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:01:48,747 INFO L85 PathProgramCache]: Analyzing trace with hash -1112456570, now seen corresponding path program 2 times [2021-11-21 01:01:48,747 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:01:48,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [90447680] [2021-11-21 01:01:48,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:01:48,748 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:01:48,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:01:48,830 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:48,831 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:01:48,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [90447680] [2021-11-21 01:01:48,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [90447680] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:01:48,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [813169202] [2021-11-21 01:01:48,832 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:01:48,832 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:01:48,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:01:48,840 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:01:48,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:01:48,886 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:01:48,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:01:48,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 01:01:48,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:01:48,944 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:48,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:01:49,012 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:49,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [813169202] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:01:49,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1460229022] [2021-11-21 01:01:49,023 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:01:49,024 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:01:49,024 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:01:49,024 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:01:49,025 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:01:50,097 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:01:50,339 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:01:50,339 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:01:50,339 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 7 [2021-11-21 01:01:50,340 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185179427] [2021-11-21 01:01:50,340 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:01:50,341 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:01:50,341 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:01:50,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:01:50,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:01:50,342 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:50,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:01:50,457 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2021-11-21 01:01:50,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 01:01:50,458 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 0 states have call successors, (0), 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 10 [2021-11-21 01:01:50,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:01:50,459 INFO L225 Difference]: With dead ends: 22 [2021-11-21 01:01:50,459 INFO L226 Difference]: Without dead ends: 20 [2021-11-21 01:01:50,460 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2021-11-21 01:01:50,461 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 10 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:01:50,462 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 12 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:01:50,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-21 01:01:50,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 14. [2021-11-21 01:01:50,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:50,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-11-21 01:01:50,474 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2021-11-21 01:01:50,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:01:50,475 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-11-21 01:01:50,475 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:50,475 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-11-21 01:01:50,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-21 01:01:50,476 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:01:50,476 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1] [2021-11-21 01:01:50,519 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:01:50,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:01:50,690 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:01:50,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:01:50,690 INFO L85 PathProgramCache]: Analyzing trace with hash -1221200653, now seen corresponding path program 3 times [2021-11-21 01:01:50,690 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:01:50,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251452998] [2021-11-21 01:01:50,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:01:50,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:01:50,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:01:50,793 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:50,793 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:01:50,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251452998] [2021-11-21 01:01:50,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251452998] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:01:50,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872505222] [2021-11-21 01:01:50,794 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:01:50,794 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:01:50,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:01:50,798 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:01:50,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:01:50,853 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:01:50,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:01:50,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:01:50,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:01:50,909 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:50,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:01:50,956 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:50,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872505222] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:01:50,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1941660157] [2021-11-21 01:01:50,961 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:01:50,962 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:01:50,962 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:01:50,962 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:01:50,963 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:01:52,080 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:01:52,304 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:01:52,304 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:01:52,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 8 [2021-11-21 01:01:52,305 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124262796] [2021-11-21 01:01:52,305 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:01:52,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:01:52,306 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:01:52,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:01:52,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:01:52,307 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:52,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:01:52,391 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2021-11-21 01:01:52,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 01:01:52,392 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 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 13 [2021-11-21 01:01:52,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:01:52,392 INFO L225 Difference]: With dead ends: 27 [2021-11-21 01:01:52,393 INFO L226 Difference]: Without dead ends: 15 [2021-11-21 01:01:52,393 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-11-21 01:01:52,395 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 3 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:01:52,395 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 23 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:01:52,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-21 01:01:52,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-21 01:01:52,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:52,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-11-21 01:01:52,409 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2021-11-21 01:01:52,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:01:52,410 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-11-21 01:01:52,410 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:52,410 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-11-21 01:01:52,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-21 01:01:52,413 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:01:52,413 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1] [2021-11-21 01:01:52,449 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-21 01:01:52,613 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:01:52,614 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:01:52,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:01:52,615 INFO L85 PathProgramCache]: Analyzing trace with hash 1326687018, now seen corresponding path program 4 times [2021-11-21 01:01:52,615 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:01:52,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537947165] [2021-11-21 01:01:52,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:01:52,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:01:52,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:01:52,727 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:52,727 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:01:52,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537947165] [2021-11-21 01:01:52,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [537947165] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:01:52,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [79216538] [2021-11-21 01:01:52,728 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:01:52,728 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:01:52,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:01:52,729 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:01:52,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:01:52,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:01:52,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 01:01:52,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:01:52,840 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:52,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:01:52,904 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:52,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [79216538] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:01:52,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2019230691] [2021-11-21 01:01:52,908 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:01:52,908 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:01:52,908 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:01:52,908 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:01:52,909 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:01:54,029 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:01:54,288 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:01:54,288 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:01:54,288 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 8 [2021-11-21 01:01:54,288 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588270487] [2021-11-21 01:01:54,289 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:01:54,289 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:01:54,289 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:01:54,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:01:54,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:01:54,290 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:54,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:01:54,412 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2021-11-21 01:01:54,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 01:01:54,419 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 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 14 [2021-11-21 01:01:54,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:01:54,420 INFO L225 Difference]: With dead ends: 26 [2021-11-21 01:01:54,420 INFO L226 Difference]: Without dead ends: 24 [2021-11-21 01:01:54,420 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=87, Invalid=255, Unknown=0, NotChecked=0, Total=342 [2021-11-21 01:01:54,422 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 12 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:01:54,422 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 16 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:01:54,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-21 01:01:54,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 18. [2021-11-21 01:01:54,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:54,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-11-21 01:01:54,428 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 14 [2021-11-21 01:01:54,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:01:54,428 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-11-21 01:01:54,428 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:54,429 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-11-21 01:01:54,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-21 01:01:54,434 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:01:54,435 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1] [2021-11-21 01:01:54,475 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:01:54,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:01:54,658 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:01:54,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:01:54,658 INFO L85 PathProgramCache]: Analyzing trace with hash 1048715727, now seen corresponding path program 5 times [2021-11-21 01:01:54,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:01:54,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1874645061] [2021-11-21 01:01:54,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:01:54,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:01:54,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:01:54,761 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:54,761 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:01:54,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1874645061] [2021-11-21 01:01:54,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1874645061] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:01:54,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1008835420] [2021-11-21 01:01:54,762 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:01:54,762 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:01:54,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:01:54,764 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:01:54,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:01:54,818 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:01:54,818 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:01:54,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:01:54,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:01:54,879 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:54,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:01:54,941 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:54,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1008835420] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:01:54,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1094167476] [2021-11-21 01:01:54,947 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:01:54,948 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:01:54,948 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:01:54,948 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:01:54,951 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:01:55,967 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:01:56,148 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:01:56,149 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:01:56,149 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 10 [2021-11-21 01:01:56,149 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130972834] [2021-11-21 01:01:56,149 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:01:56,150 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 01:01:56,150 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:01:56,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 01:01:56,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-11-21 01:01:56,151 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:56,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:01:56,245 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-11-21 01:01:56,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 01:01:56,246 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 0 states have call successors, (0), 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 17 [2021-11-21 01:01:56,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:01:56,247 INFO L225 Difference]: With dead ends: 34 [2021-11-21 01:01:56,247 INFO L226 Difference]: Without dead ends: 19 [2021-11-21 01:01:56,248 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:01:56,249 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 3 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:01:56,250 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 32 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:01:56,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-21 01:01:56,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-11-21 01:01:56,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:56,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-11-21 01:01:56,255 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 17 [2021-11-21 01:01:56,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:01:56,256 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-11-21 01:01:56,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:56,256 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-11-21 01:01:56,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-21 01:01:56,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:01:56,258 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1] [2021-11-21 01:01:56,285 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:01:56,485 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:01:56,485 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:01:56,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:01:56,486 INFO L85 PathProgramCache]: Analyzing trace with hash 920640646, now seen corresponding path program 6 times [2021-11-21 01:01:56,486 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:01:56,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918388683] [2021-11-21 01:01:56,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:01:56,486 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:01:56,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:01:56,603 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:56,603 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:01:56,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918388683] [2021-11-21 01:01:56,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [918388683] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:01:56,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1357761087] [2021-11-21 01:01:56,604 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:01:56,604 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:01:56,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:01:56,605 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:01:56,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:01:56,661 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:01:56,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:01:56,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 01:01:56,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:01:56,732 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:56,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:01:56,796 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:56,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1357761087] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:01:56,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1006447863] [2021-11-21 01:01:56,800 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:01:56,800 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:01:56,801 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:01:56,801 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:01:56,801 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:01:57,726 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:01:57,902 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:01:57,902 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:01:57,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2021-11-21 01:01:57,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219257406] [2021-11-21 01:01:57,903 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:01:57,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-21 01:01:57,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:01:57,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-21 01:01:57,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-11-21 01:01:57,905 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:58,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:01:58,028 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2021-11-21 01:01:58,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 01:01:58,028 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 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 18 [2021-11-21 01:01:58,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:01:58,029 INFO L225 Difference]: With dead ends: 30 [2021-11-21 01:01:58,029 INFO L226 Difference]: Without dead ends: 28 [2021-11-21 01:01:58,030 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=107, Invalid=313, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:01:58,031 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 21 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:01:58,031 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 14 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:01:58,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-21 01:01:58,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 22. [2021-11-21 01:01:58,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 21 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:58,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-11-21 01:01:58,037 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 18 [2021-11-21 01:01:58,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:01:58,038 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-11-21 01:01:58,038 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:58,038 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-11-21 01:01:58,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-21 01:01:58,039 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:01:58,039 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1] [2021-11-21 01:01:58,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:01:58,239 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-21 01:01:58,240 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:01:58,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:01:58,241 INFO L85 PathProgramCache]: Analyzing trace with hash -850846989, now seen corresponding path program 7 times [2021-11-21 01:01:58,241 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:01:58,241 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538541019] [2021-11-21 01:01:58,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:01:58,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:01:58,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:01:58,347 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:58,347 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:01:58,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538541019] [2021-11-21 01:01:58,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538541019] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:01:58,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [287781844] [2021-11-21 01:01:58,348 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:01:58,348 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:01:58,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:01:58,351 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:01:58,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:01:58,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:01:58,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 01:01:58,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:01:58,499 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:58,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:01:58,566 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:01:58,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [287781844] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:01:58,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2147059458] [2021-11-21 01:01:58,569 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:01:58,569 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:01:58,570 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:01:58,570 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:01:58,570 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:01:59,582 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:01:59,762 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:01:59,762 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:01:59,763 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 12 [2021-11-21 01:01:59,763 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582733546] [2021-11-21 01:01:59,763 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:01:59,765 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 01:01:59,765 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:01:59,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 01:01:59,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-11-21 01:01:59,766 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:59,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:01:59,873 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2021-11-21 01:01:59,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 01:01:59,873 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 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 21 [2021-11-21 01:01:59,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:01:59,874 INFO L225 Difference]: With dead ends: 41 [2021-11-21 01:01:59,874 INFO L226 Difference]: Without dead ends: 23 [2021-11-21 01:01:59,875 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=104, Invalid=402, Unknown=0, NotChecked=0, Total=506 [2021-11-21 01:01:59,875 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 3 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:01:59,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 39 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:01:59,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-21 01:01:59,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-21 01:01:59,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:59,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-11-21 01:01:59,882 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 21 [2021-11-21 01:01:59,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:01:59,882 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-11-21 01:01:59,883 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:01:59,883 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-11-21 01:01:59,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-21 01:01:59,884 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:01:59,884 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1] [2021-11-21 01:01:59,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:00,097 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:00,098 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:00,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:00,099 INFO L85 PathProgramCache]: Analyzing trace with hash -1773362646, now seen corresponding path program 8 times [2021-11-21 01:02:00,099 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:00,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [299860105] [2021-11-21 01:02:00,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:00,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:00,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:00,207 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:00,207 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:00,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [299860105] [2021-11-21 01:02:00,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [299860105] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:00,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [979692550] [2021-11-21 01:02:00,208 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:02:00,208 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:00,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:00,209 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:00,210 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:02:00,257 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 01:02:00,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:00,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-21 01:02:00,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:00,330 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:00,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:00,427 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:00,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [979692550] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:00,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2101374830] [2021-11-21 01:02:00,430 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:00,430 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:00,431 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:00,431 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:00,431 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:01,300 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:01,485 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:01,485 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:01,485 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 10 [2021-11-21 01:02:01,485 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295187126] [2021-11-21 01:02:01,485 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:01,486 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 01:02:01,486 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:01,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 01:02:01,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2021-11-21 01:02:01,487 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:01,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:01,629 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2021-11-21 01:02:01,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 01:02:01,630 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-21 01:02:01,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:01,631 INFO L225 Difference]: With dead ends: 34 [2021-11-21 01:02:01,631 INFO L226 Difference]: Without dead ends: 32 [2021-11-21 01:02:01,631 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=130, Invalid=376, Unknown=0, NotChecked=0, Total=506 [2021-11-21 01:02:01,633 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 24 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:01,633 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 14 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:01,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-21 01:02:01,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 26. [2021-11-21 01:02:01,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:01,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-11-21 01:02:01,640 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 22 [2021-11-21 01:02:01,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:01,641 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-11-21 01:02:01,641 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:01,641 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-11-21 01:02:01,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-21 01:02:01,642 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:01,642 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1] [2021-11-21 01:02:01,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:01,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:01,858 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:01,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:01,858 INFO L85 PathProgramCache]: Analyzing trace with hash -2144025905, now seen corresponding path program 9 times [2021-11-21 01:02:01,858 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:01,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1860273745] [2021-11-21 01:02:01,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:01,859 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:01,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:01,990 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:01,991 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:01,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1860273745] [2021-11-21 01:02:01,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1860273745] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:01,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1931727855] [2021-11-21 01:02:01,992 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:02:01,992 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:01,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:01,993 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:02,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 01:02:02,050 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:02:02,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:02,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 01:02:02,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:02,152 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:02,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:02,235 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:02,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1931727855] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:02,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1355527406] [2021-11-21 01:02:02,239 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:02,239 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:02,240 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:02,240 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:02,240 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:03,224 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:03,417 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:03,417 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:03,417 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 14 [2021-11-21 01:02:03,418 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656995770] [2021-11-21 01:02:03,418 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:03,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-21 01:02:03,418 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:03,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-21 01:02:03,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:02:03,419 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:03,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:03,552 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-11-21 01:02:03,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 01:02:03,552 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 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 25 [2021-11-21 01:02:03,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:03,553 INFO L225 Difference]: With dead ends: 48 [2021-11-21 01:02:03,553 INFO L226 Difference]: Without dead ends: 27 [2021-11-21 01:02:03,554 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=133, Invalid=517, Unknown=0, NotChecked=0, Total=650 [2021-11-21 01:02:03,555 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 3 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:03,555 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 47 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:03,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-21 01:02:03,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-11-21 01:02:03,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:03,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-11-21 01:02:03,562 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 25 [2021-11-21 01:02:03,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:03,562 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-11-21 01:02:03,562 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:03,563 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-11-21 01:02:03,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 01:02:03,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:03,564 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1] [2021-11-21 01:02:03,608 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:03,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:03,777 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:03,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:03,778 INFO L85 PathProgramCache]: Analyzing trace with hash -2128357754, now seen corresponding path program 10 times [2021-11-21 01:02:03,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:03,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1090010510] [2021-11-21 01:02:03,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:03,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:03,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:03,881 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 15 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:03,881 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:03,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1090010510] [2021-11-21 01:02:03,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1090010510] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:03,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1115298739] [2021-11-21 01:02:03,882 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:02:03,882 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:03,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:03,884 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:03,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 01:02:03,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:03,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-21 01:02:03,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:04,012 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:04,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:04,137 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:04,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1115298739] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:04,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1421924301] [2021-11-21 01:02:04,140 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:04,140 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:04,141 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:04,141 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:04,141 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:05,050 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:05,246 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:05,246 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:05,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 11 [2021-11-21 01:02:05,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389880581] [2021-11-21 01:02:05,246 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:05,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-21 01:02:05,247 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:05,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-21 01:02:05,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=207, Unknown=0, NotChecked=0, Total=272 [2021-11-21 01:02:05,247 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:05,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:05,411 INFO L93 Difference]: Finished difference Result 38 states and 39 transitions. [2021-11-21 01:02:05,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-21 01:02:05,412 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-21 01:02:05,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:05,412 INFO L225 Difference]: With dead ends: 38 [2021-11-21 01:02:05,413 INFO L226 Difference]: Without dead ends: 36 [2021-11-21 01:02:05,413 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=156, Invalid=444, Unknown=0, NotChecked=0, Total=600 [2021-11-21 01:02:05,414 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 25 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:05,414 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 15 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:05,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-21 01:02:05,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2021-11-21 01:02:05,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:05,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-11-21 01:02:05,421 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 26 [2021-11-21 01:02:05,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:05,421 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-11-21 01:02:05,421 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:05,421 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-11-21 01:02:05,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-21 01:02:05,422 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:05,422 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1] [2021-11-21 01:02:05,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:05,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-21 01:02:05,657 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:05,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:05,658 INFO L85 PathProgramCache]: Analyzing trace with hash 701161715, now seen corresponding path program 11 times [2021-11-21 01:02:05,658 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:05,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [579232516] [2021-11-21 01:02:05,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:05,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:05,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:05,816 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:05,817 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:05,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [579232516] [2021-11-21 01:02:05,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [579232516] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:05,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1280645411] [2021-11-21 01:02:05,817 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:02:05,817 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:05,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:05,818 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:05,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 01:02:05,864 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-21 01:02:05,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:05,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 01:02:05,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:05,966 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:05,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:06,049 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:06,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1280645411] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:06,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [897799908] [2021-11-21 01:02:06,052 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:06,052 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:06,053 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:06,053 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:06,053 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:06,951 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:07,153 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:07,154 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:07,154 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 16 [2021-11-21 01:02:07,154 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922211002] [2021-11-21 01:02:07,154 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:07,155 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 01:02:07,155 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:07,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 01:02:07,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=366, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:02:07,157 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:07,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:07,303 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2021-11-21 01:02:07,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 01:02:07,303 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-21 01:02:07,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:07,304 INFO L225 Difference]: With dead ends: 55 [2021-11-21 01:02:07,304 INFO L226 Difference]: Without dead ends: 31 [2021-11-21 01:02:07,305 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=166, Invalid=646, Unknown=0, NotChecked=0, Total=812 [2021-11-21 01:02:07,306 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 3 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:07,307 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 34 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:07,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-21 01:02:07,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-21 01:02:07,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:07,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2021-11-21 01:02:07,313 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 29 [2021-11-21 01:02:07,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:07,314 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2021-11-21 01:02:07,314 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:07,314 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2021-11-21 01:02:07,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-21 01:02:07,315 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:07,316 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1] [2021-11-21 01:02:07,356 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:07,537 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 01:02:07,538 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:07,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:07,538 INFO L85 PathProgramCache]: Analyzing trace with hash 822821162, now seen corresponding path program 12 times [2021-11-21 01:02:07,538 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:07,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825112288] [2021-11-21 01:02:07,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:07,539 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:07,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:07,657 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 21 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:07,657 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:07,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825112288] [2021-11-21 01:02:07,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1825112288] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:07,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [91575880] [2021-11-21 01:02:07,657 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:02:07,658 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:07,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:07,658 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:07,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 01:02:07,702 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:02:07,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:07,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-21 01:02:07,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:07,816 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:07,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:07,907 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:07,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [91575880] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:07,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [841992586] [2021-11-21 01:02:07,909 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:07,910 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:07,910 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:07,910 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:07,911 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:08,896 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:09,139 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:09,140 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:09,140 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 12 [2021-11-21 01:02:09,140 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002862707] [2021-11-21 01:02:09,140 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:09,141 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 01:02:09,141 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:09,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 01:02:09,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2021-11-21 01:02:09,142 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:09,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:09,325 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2021-11-21 01:02:09,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-21 01:02:09,326 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 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 30 [2021-11-21 01:02:09,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:09,327 INFO L225 Difference]: With dead ends: 42 [2021-11-21 01:02:09,327 INFO L226 Difference]: Without dead ends: 40 [2021-11-21 01:02:09,328 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=185, Invalid=517, Unknown=0, NotChecked=0, Total=702 [2021-11-21 01:02:09,329 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 38 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:09,329 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 13 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:09,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-21 01:02:09,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 34. [2021-11-21 01:02:09,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 33 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:09,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2021-11-21 01:02:09,337 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 30 [2021-11-21 01:02:09,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:09,338 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2021-11-21 01:02:09,338 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:09,338 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2021-11-21 01:02:09,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-21 01:02:09,339 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:09,339 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1] [2021-11-21 01:02:09,367 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:09,545 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:09,546 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:09,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:09,546 INFO L85 PathProgramCache]: Analyzing trace with hash 1291699151, now seen corresponding path program 13 times [2021-11-21 01:02:09,547 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:09,547 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914977705] [2021-11-21 01:02:09,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:09,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:09,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:09,760 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:09,760 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:09,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914977705] [2021-11-21 01:02:09,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [914977705] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:09,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474902299] [2021-11-21 01:02:09,760 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:02:09,761 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:09,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:09,777 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:09,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 01:02:09,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:09,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-21 01:02:09,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:09,996 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:09,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:10,087 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:10,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474902299] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:10,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [316775077] [2021-11-21 01:02:10,089 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:10,089 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:10,090 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:10,090 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:10,090 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:10,967 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:11,191 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:11,191 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:11,191 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 18 [2021-11-21 01:02:11,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357677119] [2021-11-21 01:02:11,192 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:11,192 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-21 01:02:11,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:11,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-21 01:02:11,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2021-11-21 01:02:11,194 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:11,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:11,398 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2021-11-21 01:02:11,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-21 01:02:11,399 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 states have internal predecessors, (35), 0 states have call successors, (0), 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 [2021-11-21 01:02:11,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:11,400 INFO L225 Difference]: With dead ends: 62 [2021-11-21 01:02:11,400 INFO L226 Difference]: Without dead ends: 35 [2021-11-21 01:02:11,401 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=203, Invalid=789, Unknown=0, NotChecked=0, Total=992 [2021-11-21 01:02:11,401 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 3 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:11,402 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 58 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:11,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-21 01:02:11,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-11-21 01:02:11,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:11,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2021-11-21 01:02:11,408 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 33 [2021-11-21 01:02:11,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:11,408 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2021-11-21 01:02:11,409 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:11,409 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2021-11-21 01:02:11,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-21 01:02:11,415 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:11,415 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1] [2021-11-21 01:02:11,448 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:11,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 01:02:11,634 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:11,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:11,634 INFO L85 PathProgramCache]: Analyzing trace with hash 1388678, now seen corresponding path program 14 times [2021-11-21 01:02:11,634 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:11,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427360017] [2021-11-21 01:02:11,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:11,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:11,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:11,765 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 28 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:11,768 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:11,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427360017] [2021-11-21 01:02:11,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [427360017] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:11,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1547048434] [2021-11-21 01:02:11,769 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:02:11,769 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:11,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:11,778 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:11,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 01:02:11,845 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-21 01:02:11,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:11,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-21 01:02:11,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:11,965 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:11,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:12,079 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:12,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1547048434] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:12,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2125557465] [2021-11-21 01:02:12,082 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:12,082 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:12,082 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:12,083 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:12,083 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:12,963 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:13,166 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:13,167 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:13,167 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 13 [2021-11-21 01:02:13,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436717056] [2021-11-21 01:02:13,167 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:13,168 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 01:02:13,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:13,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 01:02:13,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=258, Unknown=0, NotChecked=0, Total=342 [2021-11-21 01:02:13,169 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:13,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:13,394 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2021-11-21 01:02:13,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 01:02:13,394 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 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 34 [2021-11-21 01:02:13,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:13,395 INFO L225 Difference]: With dead ends: 46 [2021-11-21 01:02:13,396 INFO L226 Difference]: Without dead ends: 44 [2021-11-21 01:02:13,396 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 99 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=217, Invalid=595, Unknown=0, NotChecked=0, Total=812 [2021-11-21 01:02:13,397 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 32 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:13,398 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 16 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:13,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-21 01:02:13,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 38. [2021-11-21 01:02:13,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:13,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2021-11-21 01:02:13,406 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 34 [2021-11-21 01:02:13,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:13,406 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2021-11-21 01:02:13,407 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:13,407 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2021-11-21 01:02:13,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-21 01:02:13,408 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:13,408 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1] [2021-11-21 01:02:13,441 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:13,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 01:02:13,626 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:13,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:13,626 INFO L85 PathProgramCache]: Analyzing trace with hash -1574746381, now seen corresponding path program 15 times [2021-11-21 01:02:13,626 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:13,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1043002685] [2021-11-21 01:02:13,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:13,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:13,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:13,829 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:13,829 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:13,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1043002685] [2021-11-21 01:02:13,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1043002685] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:13,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2130660727] [2021-11-21 01:02:13,830 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:02:13,830 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:13,830 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:13,831 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:13,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 01:02:13,881 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:02:13,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:13,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-21 01:02:13,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:13,983 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:13,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:14,069 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:14,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2130660727] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:14,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1457654547] [2021-11-21 01:02:14,070 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:14,070 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:14,071 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:14,071 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:14,071 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:14,900 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:15,117 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:15,117 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:15,117 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 20 [2021-11-21 01:02:15,117 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465018655] [2021-11-21 01:02:15,118 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:15,118 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-21 01:02:15,118 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:15,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-21 01:02:15,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=514, Unknown=0, NotChecked=0, Total=650 [2021-11-21 01:02:15,120 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:15,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:15,305 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2021-11-21 01:02:15,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-21 01:02:15,305 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 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 37 [2021-11-21 01:02:15,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:15,306 INFO L225 Difference]: With dead ends: 69 [2021-11-21 01:02:15,306 INFO L226 Difference]: Without dead ends: 39 [2021-11-21 01:02:15,307 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=244, Invalid=946, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 01:02:15,307 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 3 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:15,308 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 63 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:15,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-21 01:02:15,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-11-21 01:02:15,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:15,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2021-11-21 01:02:15,315 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 37 [2021-11-21 01:02:15,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:15,316 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2021-11-21 01:02:15,316 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:15,316 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2021-11-21 01:02:15,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-21 01:02:15,317 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:15,317 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1] [2021-11-21 01:02:15,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:15,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:15,522 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:15,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:15,522 INFO L85 PathProgramCache]: Analyzing trace with hash -306741206, now seen corresponding path program 16 times [2021-11-21 01:02:15,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:15,522 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9417350] [2021-11-21 01:02:15,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:15,523 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:15,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:15,692 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 36 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:15,693 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:15,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9417350] [2021-11-21 01:02:15,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [9417350] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:15,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1490313510] [2021-11-21 01:02:15,693 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:02:15,694 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:15,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:15,697 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:15,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-21 01:02:15,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:15,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-21 01:02:15,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:15,872 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 45 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:15,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:16,004 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 45 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:16,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1490313510] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:16,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1665127616] [2021-11-21 01:02:16,006 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:16,006 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:16,007 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:16,007 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:16,007 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:16,808 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:17,002 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:17,002 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:17,003 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 14 [2021-11-21 01:02:17,003 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691170620] [2021-11-21 01:02:17,003 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:17,003 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-21 01:02:17,003 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:17,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-21 01:02:17,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:02:17,004 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:17,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:17,219 INFO L93 Difference]: Finished difference Result 50 states and 51 transitions. [2021-11-21 01:02:17,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-21 01:02:17,220 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 0 states have call successors, (0), 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 38 [2021-11-21 01:02:17,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:17,220 INFO L225 Difference]: With dead ends: 50 [2021-11-21 01:02:17,220 INFO L226 Difference]: Without dead ends: 48 [2021-11-21 01:02:17,221 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 112 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=252, Invalid=678, Unknown=0, NotChecked=0, Total=930 [2021-11-21 01:02:17,225 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 46 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:17,225 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 17 Invalid, 145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:17,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-21 01:02:17,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 42. [2021-11-21 01:02:17,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.048780487804878) internal successors, (43), 41 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:17,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2021-11-21 01:02:17,232 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 38 [2021-11-21 01:02:17,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:17,232 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2021-11-21 01:02:17,232 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:17,233 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2021-11-21 01:02:17,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-21 01:02:17,233 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:17,234 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1] [2021-11-21 01:02:17,260 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:17,437 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-21 01:02:17,438 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:17,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:17,438 INFO L85 PathProgramCache]: Analyzing trace with hash 1567958223, now seen corresponding path program 17 times [2021-11-21 01:02:17,438 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:17,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135838430] [2021-11-21 01:02:17,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:17,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:17,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:17,750 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:17,750 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:17,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135838430] [2021-11-21 01:02:17,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135838430] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:17,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1851529114] [2021-11-21 01:02:17,750 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:02:17,751 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:17,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:17,752 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:17,753 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-21 01:02:17,806 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-21 01:02:17,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:17,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-21 01:02:17,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:17,924 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:17,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:18,061 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:18,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1851529114] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:18,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [725788663] [2021-11-21 01:02:18,063 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:18,063 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:18,064 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:18,064 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:18,064 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:18,821 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:19,048 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:19,048 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:19,048 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 22 [2021-11-21 01:02:19,049 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099015957] [2021-11-21 01:02:19,049 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:19,050 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-21 01:02:19,050 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:19,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-21 01:02:19,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=597, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:02:19,052 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:19,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:19,298 INFO L93 Difference]: Finished difference Result 76 states and 78 transitions. [2021-11-21 01:02:19,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-21 01:02:19,298 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-21 01:02:19,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:19,299 INFO L225 Difference]: With dead ends: 76 [2021-11-21 01:02:19,299 INFO L226 Difference]: Without dead ends: 43 [2021-11-21 01:02:19,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=289, Invalid=1117, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 01:02:19,301 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 3 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:19,301 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 67 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:19,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-21 01:02:19,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-11-21 01:02:19,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:19,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2021-11-21 01:02:19,309 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 41 [2021-11-21 01:02:19,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:19,310 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2021-11-21 01:02:19,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:19,310 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2021-11-21 01:02:19,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-21 01:02:19,311 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:19,311 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1] [2021-11-21 01:02:19,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:19,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:19,525 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:19,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:19,526 INFO L85 PathProgramCache]: Analyzing trace with hash -448009594, now seen corresponding path program 18 times [2021-11-21 01:02:19,526 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:19,526 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295241870] [2021-11-21 01:02:19,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:19,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:19,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:19,688 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 45 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:19,688 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:19,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295241870] [2021-11-21 01:02:19,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [295241870] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:19,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1430613869] [2021-11-21 01:02:19,689 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:02:19,689 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:19,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:19,690 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:19,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-21 01:02:19,770 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:02:19,771 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:19,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-21 01:02:19,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:19,912 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 55 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:19,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:20,037 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 55 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:20,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1430613869] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:20,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1581714287] [2021-11-21 01:02:20,041 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:20,041 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:20,041 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:20,041 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:20,042 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:20,830 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:21,026 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:21,027 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:21,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 15 [2021-11-21 01:02:21,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485446658] [2021-11-21 01:02:21,027 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:21,027 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-21 01:02:21,028 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:21,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-21 01:02:21,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=313, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:02:21,028 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:21,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:21,249 INFO L93 Difference]: Finished difference Result 54 states and 55 transitions. [2021-11-21 01:02:21,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-21 01:02:21,250 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 0 states have call successors, (0), 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 42 [2021-11-21 01:02:21,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:21,250 INFO L225 Difference]: With dead ends: 54 [2021-11-21 01:02:21,250 INFO L226 Difference]: Without dead ends: 52 [2021-11-21 01:02:21,251 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 125 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=290, Invalid=766, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 01:02:21,253 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 48 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:21,253 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 21 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:21,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-21 01:02:21,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 46. [2021-11-21 01:02:21,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 45 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:21,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2021-11-21 01:02:21,262 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 42 [2021-11-21 01:02:21,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:21,263 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2021-11-21 01:02:21,263 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:21,263 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2021-11-21 01:02:21,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-21 01:02:21,264 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:21,264 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1] [2021-11-21 01:02:21,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:21,477 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:21,477 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:21,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:21,478 INFO L85 PathProgramCache]: Analyzing trace with hash 2109361395, now seen corresponding path program 19 times [2021-11-21 01:02:21,478 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:21,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [360354464] [2021-11-21 01:02:21,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:21,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:21,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:21,785 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:21,785 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:21,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [360354464] [2021-11-21 01:02:21,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [360354464] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:21,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [693362196] [2021-11-21 01:02:21,786 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:02:21,786 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:21,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:21,787 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:21,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-21 01:02:21,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:21,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 01:02:21,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:21,967 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:21,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:22,123 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:22,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [693362196] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:22,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [639377781] [2021-11-21 01:02:22,125 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:22,125 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:22,126 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:22,126 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:22,126 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:22,962 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:23,197 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:23,197 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:23,197 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 24 [2021-11-21 01:02:23,198 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [535649554] [2021-11-21 01:02:23,198 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:23,198 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 01:02:23,198 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:23,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 01:02:23,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=686, Unknown=0, NotChecked=0, Total=870 [2021-11-21 01:02:23,200 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:23,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:23,433 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2021-11-21 01:02:23,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-21 01:02:23,433 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 0 states have call successors, (0), 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 45 [2021-11-21 01:02:23,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:23,434 INFO L225 Difference]: With dead ends: 83 [2021-11-21 01:02:23,434 INFO L226 Difference]: Without dead ends: 47 [2021-11-21 01:02:23,435 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=338, Invalid=1302, Unknown=0, NotChecked=0, Total=1640 [2021-11-21 01:02:23,435 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 3 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:23,436 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 86 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:23,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-21 01:02:23,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-11-21 01:02:23,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:23,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2021-11-21 01:02:23,442 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 45 [2021-11-21 01:02:23,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:23,442 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2021-11-21 01:02:23,443 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:23,443 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2021-11-21 01:02:23,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-21 01:02:23,444 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:23,444 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1] [2021-11-21 01:02:23,488 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:23,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:23,669 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:23,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:23,670 INFO L85 PathProgramCache]: Analyzing trace with hash 213475114, now seen corresponding path program 20 times [2021-11-21 01:02:23,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:23,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [547111323] [2021-11-21 01:02:23,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:23,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:23,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:23,841 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 55 proven. 166 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:23,841 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:23,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [547111323] [2021-11-21 01:02:23,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [547111323] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:23,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [551006466] [2021-11-21 01:02:23,842 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:02:23,842 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:23,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:23,845 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:23,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-21 01:02:23,918 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-21 01:02:23,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:23,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-21 01:02:23,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:24,101 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 66 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:24,102 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:24,249 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 66 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:24,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [551006466] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:24,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [208262128] [2021-11-21 01:02:24,251 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:24,251 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:24,251 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:24,252 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:24,252 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:25,019 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:25,220 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:25,220 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:25,220 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 16 [2021-11-21 01:02:25,220 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1014355010] [2021-11-21 01:02:25,221 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:25,221 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 01:02:25,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:25,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 01:02:25,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=342, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:02:25,223 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 16 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:25,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:25,470 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2021-11-21 01:02:25,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-21 01:02:25,473 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 16 states have internal predecessors, (50), 0 states have call successors, (0), 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 46 [2021-11-21 01:02:25,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:25,474 INFO L225 Difference]: With dead ends: 58 [2021-11-21 01:02:25,474 INFO L226 Difference]: Without dead ends: 56 [2021-11-21 01:02:25,475 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 138 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 296 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=331, Invalid=859, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 01:02:25,476 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 29 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:25,477 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 16 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:25,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-21 01:02:25,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 50. [2021-11-21 01:02:25,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 49 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:25,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2021-11-21 01:02:25,485 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 46 [2021-11-21 01:02:25,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:25,486 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2021-11-21 01:02:25,486 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 16 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:25,486 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2021-11-21 01:02:25,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-21 01:02:25,487 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:25,487 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 1, 1, 1, 1] [2021-11-21 01:02:25,524 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2021-11-21 01:02:25,701 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:25,701 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:25,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:25,702 INFO L85 PathProgramCache]: Analyzing trace with hash -1204623921, now seen corresponding path program 21 times [2021-11-21 01:02:25,702 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:25,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1548899311] [2021-11-21 01:02:25,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:25,702 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:25,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:26,007 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:26,007 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:26,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1548899311] [2021-11-21 01:02:26,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1548899311] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:26,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610147683] [2021-11-21 01:02:26,008 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:02:26,008 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:26,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:26,009 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:26,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-21 01:02:26,061 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:02:26,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:26,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-21 01:02:26,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:26,196 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:26,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:26,332 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:26,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1610147683] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:26,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1638522648] [2021-11-21 01:02:26,334 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:26,334 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:26,334 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:26,335 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:26,335 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:27,181 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:27,407 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:27,407 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:27,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 26 [2021-11-21 01:02:27,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390212654] [2021-11-21 01:02:27,407 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:27,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-21 01:02:27,408 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:27,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-21 01:02:27,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=781, Unknown=0, NotChecked=0, Total=992 [2021-11-21 01:02:27,409 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand has 27 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 26 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:27,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:27,735 INFO L93 Difference]: Finished difference Result 90 states and 92 transitions. [2021-11-21 01:02:27,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-21 01:02:27,744 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 26 states have internal predecessors, (51), 0 states have call successors, (0), 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 49 [2021-11-21 01:02:27,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:27,744 INFO L225 Difference]: With dead ends: 90 [2021-11-21 01:02:27,745 INFO L226 Difference]: Without dead ends: 51 [2021-11-21 01:02:27,746 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=391, Invalid=1501, Unknown=0, NotChecked=0, Total=1892 [2021-11-21 01:02:27,746 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 3 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:27,747 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 121 Invalid, 226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:27,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-21 01:02:27,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-11-21 01:02:27,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:27,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2021-11-21 01:02:27,755 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 49 [2021-11-21 01:02:27,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:27,755 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2021-11-21 01:02:27,756 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 26 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:27,756 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2021-11-21 01:02:27,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-21 01:02:27,756 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:27,757 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1] [2021-11-21 01:02:27,806 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:27,957 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-21 01:02:27,957 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:27,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:27,958 INFO L85 PathProgramCache]: Analyzing trace with hash -1335884666, now seen corresponding path program 22 times [2021-11-21 01:02:27,958 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:27,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1123150657] [2021-11-21 01:02:27,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:27,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:27,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:28,175 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 66 proven. 199 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:28,175 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:28,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1123150657] [2021-11-21 01:02:28,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1123150657] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:28,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [622893573] [2021-11-21 01:02:28,176 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:02:28,176 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:28,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:28,177 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:28,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-21 01:02:28,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:28,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-21 01:02:28,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:28,389 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 78 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:28,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:28,523 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 78 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:28,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [622893573] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:28,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2011335358] [2021-11-21 01:02:28,526 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:28,526 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:28,527 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:28,527 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:28,527 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:29,505 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:29,752 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:29,752 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:29,753 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 17 [2021-11-21 01:02:29,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60457312] [2021-11-21 01:02:29,753 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:29,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-21 01:02:29,753 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:29,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-21 01:02:29,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2021-11-21 01:02:29,754 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 18 states, 18 states have (on average 3.0) internal successors, (54), 17 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:30,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:30,072 INFO L93 Difference]: Finished difference Result 62 states and 63 transitions. [2021-11-21 01:02:30,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-21 01:02:30,073 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.0) internal successors, (54), 17 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-21 01:02:30,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:30,073 INFO L225 Difference]: With dead ends: 62 [2021-11-21 01:02:30,073 INFO L226 Difference]: Without dead ends: 60 [2021-11-21 01:02:30,074 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 151 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 334 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=375, Invalid=957, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 01:02:30,075 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 59 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:30,075 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 17 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:30,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-21 01:02:30,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2021-11-21 01:02:30,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 53 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:30,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2021-11-21 01:02:30,082 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 50 [2021-11-21 01:02:30,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:30,082 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2021-11-21 01:02:30,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.0) internal successors, (54), 17 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:30,083 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2021-11-21 01:02:30,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-21 01:02:30,083 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:30,084 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 1, 1, 1, 1] [2021-11-21 01:02:30,108 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-11-21 01:02:30,287 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-21 01:02:30,288 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:30,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:30,288 INFO L85 PathProgramCache]: Analyzing trace with hash -168299789, now seen corresponding path program 23 times [2021-11-21 01:02:30,288 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:30,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [40635233] [2021-11-21 01:02:30,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:30,289 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:30,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:30,568 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:30,568 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:30,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [40635233] [2021-11-21 01:02:30,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [40635233] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:30,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1634003921] [2021-11-21 01:02:30,568 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:02:30,568 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:30,569 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:30,588 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:30,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-21 01:02:30,647 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-21 01:02:30,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:30,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-21 01:02:30,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:30,776 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:30,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:30,935 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:30,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1634003921] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:30,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [848955738] [2021-11-21 01:02:30,937 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:30,938 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:30,938 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:30,938 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:30,938 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:31,675 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:31,971 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:31,971 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:31,971 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 28 [2021-11-21 01:02:31,971 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445724995] [2021-11-21 01:02:31,971 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:31,972 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 01:02:31,972 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:31,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 01:02:31,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=882, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 01:02:31,973 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 29 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:32,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:32,234 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2021-11-21 01:02:32,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-21 01:02:32,234 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-21 01:02:32,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:32,235 INFO L225 Difference]: With dead ends: 97 [2021-11-21 01:02:32,235 INFO L226 Difference]: Without dead ends: 55 [2021-11-21 01:02:32,236 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 427 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=448, Invalid=1714, Unknown=0, NotChecked=0, Total=2162 [2021-11-21 01:02:32,236 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 3 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:32,237 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 70 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:32,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-21 01:02:32,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-11-21 01:02:32,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:32,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2021-11-21 01:02:32,244 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 53 [2021-11-21 01:02:32,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:32,245 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2021-11-21 01:02:32,245 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:32,245 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2021-11-21 01:02:32,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-21 01:02:32,246 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:32,246 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1] [2021-11-21 01:02:32,269 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-11-21 01:02:32,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:32,449 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:32,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:32,450 INFO L85 PathProgramCache]: Analyzing trace with hash -1065820630, now seen corresponding path program 24 times [2021-11-21 01:02:32,450 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:32,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [938485146] [2021-11-21 01:02:32,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:32,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:32,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:32,616 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 78 proven. 235 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:32,617 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:32,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [938485146] [2021-11-21 01:02:32,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [938485146] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:32,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019690593] [2021-11-21 01:02:32,617 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:02:32,617 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:32,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:32,618 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:32,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-21 01:02:32,673 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:02:32,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:32,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-21 01:02:32,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:32,808 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 91 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:32,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:32,956 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 91 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:32,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1019690593] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:32,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [70325438] [2021-11-21 01:02:32,957 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:32,957 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:32,958 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:32,958 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:32,958 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:33,672 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:33,853 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:33,853 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:33,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 18 [2021-11-21 01:02:33,853 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1894357780] [2021-11-21 01:02:33,854 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:33,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-21 01:02:33,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:33,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-21 01:02:33,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=403, Unknown=0, NotChecked=0, Total=552 [2021-11-21 01:02:33,855 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:34,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:34,128 INFO L93 Difference]: Finished difference Result 66 states and 67 transitions. [2021-11-21 01:02:34,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-21 01:02:34,129 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-21 01:02:34,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:34,129 INFO L225 Difference]: With dead ends: 66 [2021-11-21 01:02:34,129 INFO L226 Difference]: Without dead ends: 64 [2021-11-21 01:02:34,130 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 164 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=422, Invalid=1060, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 01:02:34,131 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 62 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:34,131 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 13 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:34,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-21 01:02:34,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 58. [2021-11-21 01:02:34,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 57 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:34,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2021-11-21 01:02:34,138 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 54 [2021-11-21 01:02:34,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:34,139 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2021-11-21 01:02:34,139 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:34,139 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2021-11-21 01:02:34,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-21 01:02:34,140 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:34,140 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 1, 1, 1, 1] [2021-11-21 01:02:34,176 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:34,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-21 01:02:34,353 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:34,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:34,354 INFO L85 PathProgramCache]: Analyzing trace with hash 835651279, now seen corresponding path program 25 times [2021-11-21 01:02:34,354 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:34,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194109140] [2021-11-21 01:02:34,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:34,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:34,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:34,731 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:34,731 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:34,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194109140] [2021-11-21 01:02:34,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1194109140] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:34,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1622522113] [2021-11-21 01:02:34,732 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:02:34,732 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:34,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:34,733 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:34,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-21 01:02:34,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:34,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-21 01:02:34,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:34,954 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:34,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:35,085 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:35,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1622522113] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:35,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1590626085] [2021-11-21 01:02:35,087 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:35,087 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:35,087 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:35,087 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:35,088 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:35,797 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:36,003 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:36,003 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:36,003 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 30 [2021-11-21 01:02:36,003 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544766965] [2021-11-21 01:02:36,004 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:36,004 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-21 01:02:36,004 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:36,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-21 01:02:36,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=989, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 01:02:36,005 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand has 31 states, 31 states have (on average 1.903225806451613) internal successors, (59), 30 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:36,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:36,288 INFO L93 Difference]: Finished difference Result 104 states and 106 transitions. [2021-11-21 01:02:36,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-21 01:02:36,288 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.903225806451613) internal successors, (59), 30 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-21 01:02:36,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:36,289 INFO L225 Difference]: With dead ends: 104 [2021-11-21 01:02:36,289 INFO L226 Difference]: Without dead ends: 59 [2021-11-21 01:02:36,291 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 481 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=509, Invalid=1941, Unknown=0, NotChecked=0, Total=2450 [2021-11-21 01:02:36,292 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 3 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:36,292 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 108 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:36,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-21 01:02:36,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-21 01:02:36,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:36,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2021-11-21 01:02:36,299 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 57 [2021-11-21 01:02:36,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:36,299 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2021-11-21 01:02:36,299 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.903225806451613) internal successors, (59), 30 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:36,299 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2021-11-21 01:02:36,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-21 01:02:36,300 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:36,300 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1] [2021-11-21 01:02:36,322 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-11-21 01:02:36,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-21 01:02:36,500 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:36,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:36,501 INFO L85 PathProgramCache]: Analyzing trace with hash -1360429434, now seen corresponding path program 26 times [2021-11-21 01:02:36,501 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:36,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648144490] [2021-11-21 01:02:36,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:36,501 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:36,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:36,718 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 91 proven. 274 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:36,719 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:36,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648144490] [2021-11-21 01:02:36,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [648144490] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:36,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1529272508] [2021-11-21 01:02:36,719 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:02:36,719 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:36,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:36,720 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:36,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-21 01:02:36,810 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-21 01:02:36,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:36,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-21 01:02:36,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:36,975 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 105 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:36,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:37,139 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 105 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:37,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1529272508] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:37,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2009919863] [2021-11-21 01:02:37,141 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:37,141 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:37,142 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:37,142 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:37,143 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:37,816 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:37,991 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:37,991 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:37,991 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 19 [2021-11-21 01:02:37,992 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881439728] [2021-11-21 01:02:37,992 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:37,992 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 01:02:37,992 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:37,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 01:02:37,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=435, Unknown=0, NotChecked=0, Total=600 [2021-11-21 01:02:37,993 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 20 states, 20 states have (on average 3.1) internal successors, (62), 19 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:38,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:38,265 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2021-11-21 01:02:38,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-21 01:02:38,266 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.1) internal successors, (62), 19 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-21 01:02:38,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:38,266 INFO L225 Difference]: With dead ends: 70 [2021-11-21 01:02:38,266 INFO L226 Difference]: Without dead ends: 68 [2021-11-21 01:02:38,267 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 177 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=472, Invalid=1168, Unknown=0, NotChecked=0, Total=1640 [2021-11-21 01:02:38,267 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 50 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:38,268 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 18 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 158 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:38,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-21 01:02:38,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 62. [2021-11-21 01:02:38,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 61 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) [2021-11-21 01:02:38,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2021-11-21 01:02:38,276 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 58 [2021-11-21 01:02:38,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:38,277 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2021-11-21 01:02:38,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.1) internal successors, (62), 19 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:38,277 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2021-11-21 01:02:38,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-21 01:02:38,278 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:38,278 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 1, 1, 1, 1] [2021-11-21 01:02:38,313 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2021-11-21 01:02:38,496 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:38,497 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:38,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:38,497 INFO L85 PathProgramCache]: Analyzing trace with hash -1237042957, now seen corresponding path program 27 times [2021-11-21 01:02:38,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:38,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953642933] [2021-11-21 01:02:38,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:38,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:38,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:38,936 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:38,937 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:38,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953642933] [2021-11-21 01:02:38,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [953642933] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:38,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1414786438] [2021-11-21 01:02:38,937 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:02:38,937 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:38,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:38,942 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:38,960 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-21 01:02:39,012 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:02:39,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:39,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-21 01:02:39,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:39,227 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:39,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:39,430 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:39,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1414786438] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:39,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1407155883] [2021-11-21 01:02:39,432 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:39,432 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:39,433 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:39,433 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:39,433 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:40,195 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:40,405 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:40,405 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:40,405 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 32 [2021-11-21 01:02:40,405 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394410739] [2021-11-21 01:02:40,405 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:40,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-21 01:02:40,406 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:40,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-21 01:02:40,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=1102, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 01:02:40,407 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 33 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 32 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) [2021-11-21 01:02:40,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:40,766 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2021-11-21 01:02:40,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-21 01:02:40,767 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 32 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 61 [2021-11-21 01:02:40,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:40,769 INFO L225 Difference]: With dead ends: 111 [2021-11-21 01:02:40,770 INFO L226 Difference]: Without dead ends: 63 [2021-11-21 01:02:40,772 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 538 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=574, Invalid=2182, Unknown=0, NotChecked=0, Total=2756 [2021-11-21 01:02:40,772 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 3 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:40,773 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 139 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:40,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-21 01:02:40,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-11-21 01:02:40,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.032258064516129) internal successors, (64), 62 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:40,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2021-11-21 01:02:40,781 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 61 [2021-11-21 01:02:40,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:40,782 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2021-11-21 01:02:40,782 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 32 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) [2021-11-21 01:02:40,782 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2021-11-21 01:02:40,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-21 01:02:40,783 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:40,783 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1] [2021-11-21 01:02:40,822 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2021-11-21 01:02:41,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-21 01:02:41,005 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:41,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:41,005 INFO L85 PathProgramCache]: Analyzing trace with hash -1386349270, now seen corresponding path program 28 times [2021-11-21 01:02:41,005 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:41,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [23863813] [2021-11-21 01:02:41,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:41,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:41,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:41,248 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 105 proven. 316 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:41,248 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:41,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [23863813] [2021-11-21 01:02:41,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [23863813] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:41,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [424072122] [2021-11-21 01:02:41,249 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:02:41,249 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:41,249 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:41,257 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:41,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-21 01:02:41,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:41,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-21 01:02:41,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:41,462 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 120 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:41,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:41,610 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 120 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:41,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [424072122] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:41,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1136161866] [2021-11-21 01:02:41,612 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:41,612 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:41,612 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:41,613 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:41,613 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:42,248 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:42,443 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:42,443 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:42,444 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 20 [2021-11-21 01:02:42,444 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024348590] [2021-11-21 01:02:42,444 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:42,444 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-21 01:02:42,444 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:42,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-21 01:02:42,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=468, Unknown=0, NotChecked=0, Total=650 [2021-11-21 01:02:42,445 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 20 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) [2021-11-21 01:02:42,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:42,720 INFO L93 Difference]: Finished difference Result 74 states and 75 transitions. [2021-11-21 01:02:42,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-21 01:02:42,721 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 20 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 62 [2021-11-21 01:02:42,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:42,721 INFO L225 Difference]: With dead ends: 74 [2021-11-21 01:02:42,722 INFO L226 Difference]: Without dead ends: 72 [2021-11-21 01:02:42,722 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 190 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 460 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=525, Invalid=1281, Unknown=0, NotChecked=0, Total=1806 [2021-11-21 01:02:42,723 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 38 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:42,723 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 14 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:42,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-21 01:02:42,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 66. [2021-11-21 01:02:42,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 65 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) [2021-11-21 01:02:42,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2021-11-21 01:02:42,731 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 62 [2021-11-21 01:02:42,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:42,731 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2021-11-21 01:02:42,732 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 20 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) [2021-11-21 01:02:42,732 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2021-11-21 01:02:42,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-21 01:02:42,732 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:42,733 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1] [2021-11-21 01:02:42,757 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:42,937 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:42,937 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:42,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:42,938 INFO L85 PathProgramCache]: Analyzing trace with hash -320763953, now seen corresponding path program 29 times [2021-11-21 01:02:42,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:42,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828225715] [2021-11-21 01:02:42,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:42,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:42,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:43,353 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:43,353 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:43,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [828225715] [2021-11-21 01:02:43,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [828225715] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:43,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1384139287] [2021-11-21 01:02:43,354 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:02:43,354 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:43,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:43,356 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:43,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-21 01:02:43,429 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-21 01:02:43,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:43,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-21 01:02:43,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:43,576 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:43,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:43,709 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:43,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1384139287] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:43,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1185000790] [2021-11-21 01:02:43,711 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:43,711 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:43,711 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:43,711 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:43,711 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:44,438 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:44,661 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:44,661 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:44,661 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 34 [2021-11-21 01:02:44,662 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128790706] [2021-11-21 01:02:44,662 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:44,662 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-21 01:02:44,663 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:44,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-21 01:02:44,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=1221, Unknown=0, NotChecked=0, Total=1560 [2021-11-21 01:02:44,664 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 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) [2021-11-21 01:02:45,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:45,069 INFO L93 Difference]: Finished difference Result 118 states and 120 transitions. [2021-11-21 01:02:45,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-21 01:02:45,069 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 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 65 [2021-11-21 01:02:45,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:45,069 INFO L225 Difference]: With dead ends: 118 [2021-11-21 01:02:45,070 INFO L226 Difference]: Without dead ends: 67 [2021-11-21 01:02:45,071 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 188 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 598 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=643, Invalid=2437, Unknown=0, NotChecked=0, Total=3080 [2021-11-21 01:02:45,072 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 3 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 284 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 284 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:45,072 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 140 Invalid, 290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 284 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:45,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-21 01:02:45,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-11-21 01:02:45,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:45,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2021-11-21 01:02:45,081 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 65 [2021-11-21 01:02:45,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:45,081 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2021-11-21 01:02:45,081 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 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) [2021-11-21 01:02:45,082 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2021-11-21 01:02:45,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-21 01:02:45,082 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:45,082 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1] [2021-11-21 01:02:45,106 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2021-11-21 01:02:45,285 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:45,285 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:45,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:45,286 INFO L85 PathProgramCache]: Analyzing trace with hash 2088786054, now seen corresponding path program 30 times [2021-11-21 01:02:45,286 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:45,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18685843] [2021-11-21 01:02:45,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:45,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:45,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:45,531 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 120 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:45,531 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:45,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18685843] [2021-11-21 01:02:45,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [18685843] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:45,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [410131782] [2021-11-21 01:02:45,532 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:02:45,532 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:45,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:45,537 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:45,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-21 01:02:45,630 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:02:45,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:45,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-21 01:02:45,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:45,862 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 136 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:45,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:46,072 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 136 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:46,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [410131782] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:46,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [476020981] [2021-11-21 01:02:46,074 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:46,075 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:46,075 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:46,075 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:46,075 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:46,940 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:47,144 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:47,144 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:47,144 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 21 [2021-11-21 01:02:47,144 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862080915] [2021-11-21 01:02:47,144 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:47,144 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-21 01:02:47,144 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:47,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-21 01:02:47,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=502, Unknown=0, NotChecked=0, Total=702 [2021-11-21 01:02:47,145 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand has 22 states, 22 states have (on average 3.1818181818181817) internal successors, (70), 21 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:47,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:47,430 INFO L93 Difference]: Finished difference Result 78 states and 79 transitions. [2021-11-21 01:02:47,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-21 01:02:47,431 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.1818181818181817) internal successors, (70), 21 states have internal predecessors, (70), 0 states have call successors, (0), 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 [2021-11-21 01:02:47,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:47,431 INFO L225 Difference]: With dead ends: 78 [2021-11-21 01:02:47,431 INFO L226 Difference]: Without dead ends: 76 [2021-11-21 01:02:47,433 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 203 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=581, Invalid=1399, Unknown=0, NotChecked=0, Total=1980 [2021-11-21 01:02:47,433 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 42 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:47,434 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 16 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:47,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-21 01:02:47,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 70. [2021-11-21 01:02:47,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.0289855072463767) internal successors, (71), 69 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:47,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2021-11-21 01:02:47,444 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 66 [2021-11-21 01:02:47,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:47,444 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2021-11-21 01:02:47,444 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.1818181818181817) internal successors, (70), 21 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:47,444 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2021-11-21 01:02:47,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-21 01:02:47,445 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:47,445 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 1, 1, 1, 1] [2021-11-21 01:02:47,473 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2021-11-21 01:02:47,653 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:47,654 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:47,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:47,654 INFO L85 PathProgramCache]: Analyzing trace with hash 1543970547, now seen corresponding path program 31 times [2021-11-21 01:02:47,654 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:47,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [810440185] [2021-11-21 01:02:47,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:47,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:47,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:48,172 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:48,173 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:48,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [810440185] [2021-11-21 01:02:48,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [810440185] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:48,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1776272148] [2021-11-21 01:02:48,173 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:02:48,173 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:48,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:48,175 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:48,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-21 01:02:48,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:48,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-21 01:02:48,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:48,495 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:48,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:48,694 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:48,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1776272148] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:48,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2133949897] [2021-11-21 01:02:48,698 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:48,698 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:48,698 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:48,699 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:48,699 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:49,468 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:49,783 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:49,783 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:49,783 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 36 [2021-11-21 01:02:49,783 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507387623] [2021-11-21 01:02:49,783 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:49,784 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-21 01:02:49,784 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:49,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-21 01:02:49,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=1346, Unknown=0, NotChecked=0, Total=1722 [2021-11-21 01:02:49,785 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand has 37 states, 37 states have (on average 1.9189189189189189) internal successors, (71), 36 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:50,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:50,281 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2021-11-21 01:02:50,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-21 01:02:50,282 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.9189189189189189) internal successors, (71), 36 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-21 01:02:50,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:50,283 INFO L225 Difference]: With dead ends: 125 [2021-11-21 01:02:50,283 INFO L226 Difference]: Without dead ends: 71 [2021-11-21 01:02:50,284 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 661 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=716, Invalid=2706, Unknown=0, NotChecked=0, Total=3422 [2021-11-21 01:02:50,285 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 3 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:50,285 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 154 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:02:50,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-21 01:02:50,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-11-21 01:02:50,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:50,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2021-11-21 01:02:50,309 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 69 [2021-11-21 01:02:50,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:50,310 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2021-11-21 01:02:50,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.9189189189189189) internal successors, (71), 36 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:50,310 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2021-11-21 01:02:50,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-21 01:02:50,311 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:50,311 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1] [2021-11-21 01:02:50,357 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:50,529 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:50,529 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:50,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:50,530 INFO L85 PathProgramCache]: Analyzing trace with hash 1775287338, now seen corresponding path program 32 times [2021-11-21 01:02:50,530 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:50,530 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680069254] [2021-11-21 01:02:50,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:50,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:50,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:50,797 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 136 proven. 409 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:50,797 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:50,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1680069254] [2021-11-21 01:02:50,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1680069254] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:50,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1734741451] [2021-11-21 01:02:50,798 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:02:50,798 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:50,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:50,799 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:50,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-21 01:02:50,880 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-11-21 01:02:50,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:50,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-21 01:02:50,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:51,067 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 153 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:51,067 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:51,247 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 153 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:51,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1734741451] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:51,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [825295735] [2021-11-21 01:02:51,249 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:51,249 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:51,249 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:51,250 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:51,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:52,137 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:52,353 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:52,353 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:52,353 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 22 [2021-11-21 01:02:52,354 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842132127] [2021-11-21 01:02:52,354 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:52,354 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-21 01:02:52,354 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:52,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-21 01:02:52,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=537, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:02:52,355 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 23 states, 23 states have (on average 3.217391304347826) internal successors, (74), 22 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:52,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:52,663 INFO L93 Difference]: Finished difference Result 82 states and 83 transitions. [2021-11-21 01:02:52,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-21 01:02:52,663 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.217391304347826) internal successors, (74), 22 states have internal predecessors, (74), 0 states have call successors, (0), 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 70 [2021-11-21 01:02:52,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:52,664 INFO L225 Difference]: With dead ends: 82 [2021-11-21 01:02:52,664 INFO L226 Difference]: Without dead ends: 80 [2021-11-21 01:02:52,665 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 216 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 554 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=640, Invalid=1522, Unknown=0, NotChecked=0, Total=2162 [2021-11-21 01:02:52,665 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 76 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:52,666 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 15 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:02:52,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-21 01:02:52,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 74. [2021-11-21 01:02:52,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0273972602739727) internal successors, (75), 73 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:52,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2021-11-21 01:02:52,674 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 70 [2021-11-21 01:02:52,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:52,674 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2021-11-21 01:02:52,674 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.217391304347826) internal successors, (74), 22 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:52,674 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2021-11-21 01:02:52,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-21 01:02:52,674 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:52,674 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 1, 1, 1, 1] [2021-11-21 01:02:52,699 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:52,875 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-21 01:02:52,875 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:52,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:52,876 INFO L85 PathProgramCache]: Analyzing trace with hash -637376305, now seen corresponding path program 33 times [2021-11-21 01:02:52,876 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:52,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1245007944] [2021-11-21 01:02:52,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:52,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:52,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:53,498 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:53,498 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:53,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1245007944] [2021-11-21 01:02:53,498 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1245007944] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:53,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [634933759] [2021-11-21 01:02:53,498 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:02:53,499 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:53,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:53,500 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:53,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-21 01:02:53,595 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:02:53,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:53,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-21 01:02:53,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:53,797 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:53,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:54,017 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:54,018 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [634933759] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:54,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [386548750] [2021-11-21 01:02:54,019 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:54,020 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:54,020 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:54,020 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:54,020 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:54,750 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:55,012 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:55,012 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:55,012 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 38 [2021-11-21 01:02:55,012 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549196627] [2021-11-21 01:02:55,012 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:55,013 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-21 01:02:55,013 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:55,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-21 01:02:55,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=415, Invalid=1477, Unknown=0, NotChecked=0, Total=1892 [2021-11-21 01:02:55,014 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand has 39 states, 39 states have (on average 1.9230769230769231) internal successors, (75), 38 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:55,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:55,506 INFO L93 Difference]: Finished difference Result 132 states and 134 transitions. [2021-11-21 01:02:55,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-21 01:02:55,507 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.9230769230769231) internal successors, (75), 38 states have internal predecessors, (75), 0 states have call successors, (0), 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 73 [2021-11-21 01:02:55,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:55,507 INFO L225 Difference]: With dead ends: 132 [2021-11-21 01:02:55,508 INFO L226 Difference]: Without dead ends: 75 [2021-11-21 01:02:55,509 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 212 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 727 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=793, Invalid=2989, Unknown=0, NotChecked=0, Total=3782 [2021-11-21 01:02:55,509 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 3 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 367 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 370 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:55,510 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 190 Invalid, 370 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 367 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:02:55,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-21 01:02:55,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-21 01:02:55,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:55,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2021-11-21 01:02:55,518 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 73 [2021-11-21 01:02:55,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:55,518 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2021-11-21 01:02:55,518 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.9230769230769231) internal successors, (75), 38 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:55,518 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2021-11-21 01:02:55,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-21 01:02:55,519 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:55,519 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 1, 1, 1, 1] [2021-11-21 01:02:55,545 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:55,719 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-21 01:02:55,720 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:55,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:55,720 INFO L85 PathProgramCache]: Analyzing trace with hash -2101570938, now seen corresponding path program 34 times [2021-11-21 01:02:55,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:55,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717425167] [2021-11-21 01:02:55,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:55,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:55,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:56,060 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 153 proven. 460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:56,060 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:56,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717425167] [2021-11-21 01:02:56,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [717425167] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:56,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1624395107] [2021-11-21 01:02:56,060 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:02:56,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:56,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:56,062 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:56,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-21 01:02:56,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:56,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-21 01:02:56,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:56,389 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 171 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:56,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:56,630 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 171 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:56,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1624395107] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:56,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1315816005] [2021-11-21 01:02:56,632 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:56,632 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:56,632 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:56,632 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:56,633 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:02:57,471 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:02:57,690 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:02:57,690 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:02:57,690 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 23 [2021-11-21 01:02:57,691 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309487357] [2021-11-21 01:02:57,691 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:02:57,692 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 01:02:57,692 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:02:57,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 01:02:57,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=573, Unknown=0, NotChecked=0, Total=812 [2021-11-21 01:02:57,693 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand has 24 states, 24 states have (on average 3.25) internal successors, (78), 23 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:58,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:02:58,108 INFO L93 Difference]: Finished difference Result 86 states and 87 transitions. [2021-11-21 01:02:58,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-21 01:02:58,108 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.25) internal successors, (78), 23 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-21 01:02:58,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:02:58,109 INFO L225 Difference]: With dead ends: 86 [2021-11-21 01:02:58,109 INFO L226 Difference]: Without dead ends: 84 [2021-11-21 01:02:58,110 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 229 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 604 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=702, Invalid=1650, Unknown=0, NotChecked=0, Total=2352 [2021-11-21 01:02:58,110 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 64 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:02:58,110 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 18 Invalid, 272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 196 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:02:58,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-21 01:02:58,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 78. [2021-11-21 01:02:58,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.025974025974026) internal successors, (79), 77 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:58,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2021-11-21 01:02:58,134 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 74 [2021-11-21 01:02:58,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:02:58,134 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2021-11-21 01:02:58,134 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 3.25) internal successors, (78), 23 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:02:58,135 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2021-11-21 01:02:58,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-21 01:02:58,135 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:02:58,135 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 1, 1, 1, 1] [2021-11-21 01:02:58,161 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-21 01:02:58,335 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:58,336 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:02:58,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:02:58,336 INFO L85 PathProgramCache]: Analyzing trace with hash -156719885, now seen corresponding path program 35 times [2021-11-21 01:02:58,336 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:02:58,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426734014] [2021-11-21 01:02:58,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:02:58,337 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:02:58,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:02:58,894 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:58,894 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:02:58,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426734014] [2021-11-21 01:02:58,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1426734014] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:02:58,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802944496] [2021-11-21 01:02:58,894 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:02:58,894 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:02:58,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:02:58,895 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:02:58,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-21 01:02:58,979 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2021-11-21 01:02:58,979 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:02:58,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-21 01:02:58,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:02:59,182 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:59,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:02:59,361 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:02:59,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [802944496] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:02:59,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1225989654] [2021-11-21 01:02:59,363 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:02:59,364 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:02:59,364 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:02:59,364 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:02:59,365 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:00,142 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:00,397 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:00,397 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:00,397 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 40 [2021-11-21 01:03:00,397 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247102124] [2021-11-21 01:03:00,397 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:00,398 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-21 01:03:00,398 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:00,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-21 01:03:00,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=456, Invalid=1614, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 01:03:00,399 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand has 41 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 40 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:00,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:00,966 INFO L93 Difference]: Finished difference Result 139 states and 141 transitions. [2021-11-21 01:03:00,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-21 01:03:00,967 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 40 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2021-11-21 01:03:00,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:00,967 INFO L225 Difference]: With dead ends: 139 [2021-11-21 01:03:00,968 INFO L226 Difference]: Without dead ends: 79 [2021-11-21 01:03:00,968 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 224 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 796 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=874, Invalid=3286, Unknown=0, NotChecked=0, Total=4160 [2021-11-21 01:03:00,969 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 3 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 301 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:00,969 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 152 Invalid, 301 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:03:00,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-21 01:03:00,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-11-21 01:03:00,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 78 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:00,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2021-11-21 01:03:00,977 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 77 [2021-11-21 01:03:00,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:00,977 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2021-11-21 01:03:00,977 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 40 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:00,978 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2021-11-21 01:03:00,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-21 01:03:00,978 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:00,978 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1, 1, 1] [2021-11-21 01:03:01,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-21 01:03:01,193 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-21 01:03:01,193 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:01,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:01,194 INFO L85 PathProgramCache]: Analyzing trace with hash -29811926, now seen corresponding path program 36 times [2021-11-21 01:03:01,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:01,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359218653] [2021-11-21 01:03:01,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:01,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:01,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:01,506 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 171 proven. 514 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:01,506 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:01,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359218653] [2021-11-21 01:03:01,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [359218653] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:01,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26360044] [2021-11-21 01:03:01,506 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:03:01,506 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:01,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:01,507 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:01,508 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-21 01:03:01,573 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:03:01,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:03:01,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-21 01:03:01,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:01,764 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 190 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:01,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:01,973 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 190 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:01,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [26360044] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:01,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1170859852] [2021-11-21 01:03:01,974 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:03:01,974 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:01,974 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:01,974 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:01,975 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:02,669 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:02,874 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:02,874 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:02,875 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 24 [2021-11-21 01:03:02,875 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773355541] [2021-11-21 01:03:02,875 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:02,875 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 01:03:02,875 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:02,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 01:03:02,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=610, Unknown=0, NotChecked=0, Total=870 [2021-11-21 01:03:02,876 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 25 states, 25 states have (on average 3.28) internal successors, (82), 24 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:03,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:03,264 INFO L93 Difference]: Finished difference Result 90 states and 91 transitions. [2021-11-21 01:03:03,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-21 01:03:03,265 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.28) internal successors, (82), 24 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-21 01:03:03,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:03,265 INFO L225 Difference]: With dead ends: 90 [2021-11-21 01:03:03,265 INFO L226 Difference]: Without dead ends: 88 [2021-11-21 01:03:03,266 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 242 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 656 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=767, Invalid=1783, Unknown=0, NotChecked=0, Total=2550 [2021-11-21 01:03:03,266 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 45 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:03,267 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 16 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:03:03,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-21 01:03:03,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 82. [2021-11-21 01:03:03,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.0246913580246915) internal successors, (83), 81 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:03,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2021-11-21 01:03:03,280 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 78 [2021-11-21 01:03:03,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:03,281 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2021-11-21 01:03:03,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.28) internal successors, (82), 24 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:03,281 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2021-11-21 01:03:03,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-21 01:03:03,282 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:03,282 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 1, 1, 1, 1] [2021-11-21 01:03:03,307 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-21 01:03:03,485 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-21 01:03:03,485 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:03,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:03,486 INFO L85 PathProgramCache]: Analyzing trace with hash 935963087, now seen corresponding path program 37 times [2021-11-21 01:03:03,486 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:03,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1810074401] [2021-11-21 01:03:03,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:03,486 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:03,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:04,147 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:04,149 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:04,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1810074401] [2021-11-21 01:03:04,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1810074401] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:04,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353270975] [2021-11-21 01:03:04,150 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:03:04,150 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:04,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:04,151 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:04,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-21 01:03:04,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:04,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-21 01:03:04,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:04,405 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:04,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:04,588 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:04,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [353270975] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:04,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [767721468] [2021-11-21 01:03:04,589 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:03:04,589 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:04,589 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:04,590 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:04,590 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:05,353 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:05,621 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:05,621 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:05,622 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 42 [2021-11-21 01:03:05,622 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193074716] [2021-11-21 01:03:05,622 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:05,622 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-21 01:03:05,622 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:05,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-21 01:03:05,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=499, Invalid=1757, Unknown=0, NotChecked=0, Total=2256 [2021-11-21 01:03:05,623 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand has 43 states, 43 states have (on average 1.930232558139535) internal successors, (83), 42 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:06,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:06,185 INFO L93 Difference]: Finished difference Result 146 states and 148 transitions. [2021-11-21 01:03:06,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-21 01:03:06,186 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.930232558139535) internal successors, (83), 42 states have internal predecessors, (83), 0 states have call successors, (0), 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 81 [2021-11-21 01:03:06,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:06,187 INFO L225 Difference]: With dead ends: 146 [2021-11-21 01:03:06,187 INFO L226 Difference]: Without dead ends: 83 [2021-11-21 01:03:06,188 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 236 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 868 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=959, Invalid=3597, Unknown=0, NotChecked=0, Total=4556 [2021-11-21 01:03:06,189 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 3 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 385 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 389 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 385 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:06,189 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 191 Invalid, 389 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 385 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:03:06,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-21 01:03:06,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-11-21 01:03:06,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:06,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2021-11-21 01:03:06,203 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 81 [2021-11-21 01:03:06,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:06,204 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2021-11-21 01:03:06,204 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.930232558139535) internal successors, (83), 42 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:06,204 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2021-11-21 01:03:06,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-21 01:03:06,205 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:06,205 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1, 1, 1] [2021-11-21 01:03:06,253 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-21 01:03:06,433 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:06,433 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:06,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:06,434 INFO L85 PathProgramCache]: Analyzing trace with hash 2033593478, now seen corresponding path program 38 times [2021-11-21 01:03:06,434 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:06,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123995798] [2021-11-21 01:03:06,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:06,434 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:06,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:06,831 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 190 proven. 571 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:06,831 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:06,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123995798] [2021-11-21 01:03:06,831 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [123995798] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:06,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1255826575] [2021-11-21 01:03:06,831 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:03:06,832 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:06,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:06,833 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:06,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-21 01:03:06,966 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2021-11-21 01:03:06,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:03:06,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-21 01:03:06,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:07,247 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 210 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:07,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:07,542 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 210 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:07,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1255826575] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:07,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1983837440] [2021-11-21 01:03:07,544 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:03:07,545 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:07,545 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:07,545 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:07,545 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:08,319 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:08,549 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:08,549 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:08,550 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 25 [2021-11-21 01:03:08,550 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103235934] [2021-11-21 01:03:08,550 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:08,550 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-21 01:03:08,550 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:08,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-21 01:03:08,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=648, Unknown=0, NotChecked=0, Total=930 [2021-11-21 01:03:08,551 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 26 states, 26 states have (on average 3.3076923076923075) internal successors, (86), 25 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:09,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:09,031 INFO L93 Difference]: Finished difference Result 94 states and 95 transitions. [2021-11-21 01:03:09,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-21 01:03:09,031 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.3076923076923075) internal successors, (86), 25 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-21 01:03:09,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:09,032 INFO L225 Difference]: With dead ends: 94 [2021-11-21 01:03:09,032 INFO L226 Difference]: Without dead ends: 92 [2021-11-21 01:03:09,033 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 255 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 710 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=835, Invalid=1921, Unknown=0, NotChecked=0, Total=2756 [2021-11-21 01:03:09,033 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 49 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:09,034 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 12 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:03:09,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-21 01:03:09,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 86. [2021-11-21 01:03:09,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.0235294117647058) internal successors, (87), 85 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:09,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2021-11-21 01:03:09,044 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 82 [2021-11-21 01:03:09,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:09,044 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2021-11-21 01:03:09,045 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.3076923076923075) internal successors, (86), 25 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:09,045 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2021-11-21 01:03:09,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-21 01:03:09,046 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:09,046 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 1, 1, 1, 1] [2021-11-21 01:03:09,078 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2021-11-21 01:03:09,261 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-21 01:03:09,262 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:09,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:09,262 INFO L85 PathProgramCache]: Analyzing trace with hash -2020553997, now seen corresponding path program 39 times [2021-11-21 01:03:09,262 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:09,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092320929] [2021-11-21 01:03:09,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:09,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:09,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:10,103 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:10,103 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:10,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092320929] [2021-11-21 01:03:10,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1092320929] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:10,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [105168951] [2021-11-21 01:03:10,104 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:03:10,104 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:10,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:10,109 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:10,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-21 01:03:10,208 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:03:10,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:03:10,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-21 01:03:10,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:10,518 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:10,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:10,799 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:10,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [105168951] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:10,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [281179982] [2021-11-21 01:03:10,802 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:03:10,802 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:10,802 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:10,802 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:10,803 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:11,547 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:11,820 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:11,820 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:11,821 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 44 [2021-11-21 01:03:11,821 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458131116] [2021-11-21 01:03:11,821 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:11,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-21 01:03:11,822 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:11,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-21 01:03:11,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=544, Invalid=1906, Unknown=0, NotChecked=0, Total=2450 [2021-11-21 01:03:11,823 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand has 45 states, 45 states have (on average 1.9333333333333333) internal successors, (87), 44 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:12,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:12,425 INFO L93 Difference]: Finished difference Result 153 states and 155 transitions. [2021-11-21 01:03:12,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-21 01:03:12,425 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.9333333333333333) internal successors, (87), 44 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-21 01:03:12,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:12,426 INFO L225 Difference]: With dead ends: 153 [2021-11-21 01:03:12,426 INFO L226 Difference]: Without dead ends: 87 [2021-11-21 01:03:12,427 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 248 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 943 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1048, Invalid=3922, Unknown=0, NotChecked=0, Total=4970 [2021-11-21 01:03:12,427 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 3 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:12,428 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 125 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:03:12,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-11-21 01:03:12,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-11-21 01:03:12,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.0232558139534884) internal successors, (88), 86 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:12,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2021-11-21 01:03:12,440 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 85 [2021-11-21 01:03:12,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:12,440 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2021-11-21 01:03:12,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.9333333333333333) internal successors, (87), 44 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:12,441 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2021-11-21 01:03:12,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-21 01:03:12,441 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:12,441 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1, 1, 1] [2021-11-21 01:03:12,468 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2021-11-21 01:03:12,641 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:12,642 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:12,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:12,643 INFO L85 PathProgramCache]: Analyzing trace with hash 1694439978, now seen corresponding path program 40 times [2021-11-21 01:03:12,643 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:12,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656946447] [2021-11-21 01:03:12,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:12,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:12,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:13,032 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 210 proven. 631 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:13,032 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:13,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656946447] [2021-11-21 01:03:13,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1656946447] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:13,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463690259] [2021-11-21 01:03:13,033 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:03:13,033 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:13,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:13,045 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:13,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-21 01:03:13,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:13,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 343 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-21 01:03:13,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:13,371 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 231 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:13,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:13,602 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 231 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:13,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463690259] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:13,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [673126879] [2021-11-21 01:03:13,604 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:03:13,604 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:13,605 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:13,605 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:13,605 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:14,359 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:14,588 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:14,588 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:14,588 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 26 [2021-11-21 01:03:14,589 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676577996] [2021-11-21 01:03:14,589 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:14,589 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-21 01:03:14,589 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:14,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-21 01:03:14,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=687, Unknown=0, NotChecked=0, Total=992 [2021-11-21 01:03:14,590 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand has 27 states, 27 states have (on average 3.3333333333333335) internal successors, (90), 26 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) [2021-11-21 01:03:15,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:15,043 INFO L93 Difference]: Finished difference Result 98 states and 99 transitions. [2021-11-21 01:03:15,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-21 01:03:15,044 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.3333333333333335) internal successors, (90), 26 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 86 [2021-11-21 01:03:15,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:15,045 INFO L225 Difference]: With dead ends: 98 [2021-11-21 01:03:15,045 INFO L226 Difference]: Without dead ends: 96 [2021-11-21 01:03:15,045 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 268 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 766 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=906, Invalid=2064, Unknown=0, NotChecked=0, Total=2970 [2021-11-21 01:03:15,046 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 96 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:15,046 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 17 Invalid, 299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:03:15,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-21 01:03:15,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 90. [2021-11-21 01:03:15,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.0224719101123596) internal successors, (91), 89 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) [2021-11-21 01:03:15,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2021-11-21 01:03:15,058 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 86 [2021-11-21 01:03:15,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:15,058 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2021-11-21 01:03:15,058 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 3.3333333333333335) internal successors, (90), 26 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) [2021-11-21 01:03:15,059 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2021-11-21 01:03:15,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-21 01:03:15,059 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:15,059 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 1, 1, 1, 1] [2021-11-21 01:03:15,085 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-21 01:03:15,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:15,260 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:15,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:15,261 INFO L85 PathProgramCache]: Analyzing trace with hash 315574991, now seen corresponding path program 41 times [2021-11-21 01:03:15,261 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:15,261 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658356456] [2021-11-21 01:03:15,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:15,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:15,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:16,064 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 672 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:16,064 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:16,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658356456] [2021-11-21 01:03:16,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1658356456] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:16,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [387452916] [2021-11-21 01:03:16,065 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:03:16,065 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:16,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:16,066 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:16,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-21 01:03:16,167 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-11-21 01:03:16,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:03:16,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-21 01:03:16,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:16,452 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 672 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:16,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:16,678 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 672 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:16,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [387452916] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:16,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1770159810] [2021-11-21 01:03:16,680 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:03:16,680 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:16,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:16,681 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:16,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:17,411 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:17,688 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:17,688 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:17,688 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 46 [2021-11-21 01:03:17,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371396808] [2021-11-21 01:03:17,689 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:17,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-21 01:03:17,689 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:17,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-21 01:03:17,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=591, Invalid=2061, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 01:03:17,691 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand has 47 states, 47 states have (on average 1.9361702127659575) internal successors, (91), 46 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) [2021-11-21 01:03:18,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:18,365 INFO L93 Difference]: Finished difference Result 160 states and 162 transitions. [2021-11-21 01:03:18,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-21 01:03:18,365 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.9361702127659575) internal successors, (91), 46 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 89 [2021-11-21 01:03:18,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:18,366 INFO L225 Difference]: With dead ends: 160 [2021-11-21 01:03:18,366 INFO L226 Difference]: Without dead ends: 91 [2021-11-21 01:03:18,367 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 260 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1021 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1141, Invalid=4261, Unknown=0, NotChecked=0, Total=5402 [2021-11-21 01:03:18,370 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 3 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 294 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 301 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:18,373 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 148 Invalid, 301 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 294 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:03:18,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-21 01:03:18,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2021-11-21 01:03:18,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.0222222222222221) internal successors, (92), 90 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) [2021-11-21 01:03:18,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2021-11-21 01:03:18,390 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 89 [2021-11-21 01:03:18,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:18,392 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2021-11-21 01:03:18,393 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.9361702127659575) internal successors, (91), 46 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) [2021-11-21 01:03:18,393 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2021-11-21 01:03:18,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-21 01:03:18,394 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:18,394 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 1, 1, 1, 1] [2021-11-21 01:03:18,441 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-21 01:03:18,607 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:18,608 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:18,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:18,608 INFO L85 PathProgramCache]: Analyzing trace with hash -444258682, now seen corresponding path program 42 times [2021-11-21 01:03:18,608 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:18,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1234232753] [2021-11-21 01:03:18,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:18,609 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:18,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:19,065 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 231 proven. 694 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:19,065 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:19,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1234232753] [2021-11-21 01:03:19,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1234232753] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:19,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [249864236] [2021-11-21 01:03:19,066 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:03:19,066 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:19,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:19,067 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:19,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-21 01:03:19,163 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:03:19,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:03:19,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-21 01:03:19,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:19,438 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 253 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:19,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:19,662 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 253 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:19,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [249864236] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:19,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1130124955] [2021-11-21 01:03:19,664 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:03:19,664 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:19,665 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:19,665 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:19,665 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:20,475 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:20,709 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:20,709 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:20,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 27 [2021-11-21 01:03:20,709 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837759375] [2021-11-21 01:03:20,710 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:20,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-21 01:03:20,710 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:20,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-21 01:03:20,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=727, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 01:03:20,711 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand has 28 states, 28 states have (on average 3.357142857142857) internal successors, (94), 27 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) [2021-11-21 01:03:21,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:21,213 INFO L93 Difference]: Finished difference Result 102 states and 103 transitions. [2021-11-21 01:03:21,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-21 01:03:21,214 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.357142857142857) internal successors, (94), 27 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 90 [2021-11-21 01:03:21,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:21,215 INFO L225 Difference]: With dead ends: 102 [2021-11-21 01:03:21,215 INFO L226 Difference]: Without dead ends: 100 [2021-11-21 01:03:21,215 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 281 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 824 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=980, Invalid=2212, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 01:03:21,216 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 54 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:21,216 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 16 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 241 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:03:21,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-21 01:03:21,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 94. [2021-11-21 01:03:21,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 93 states have (on average 1.021505376344086) internal successors, (95), 93 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) [2021-11-21 01:03:21,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2021-11-21 01:03:21,226 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 90 [2021-11-21 01:03:21,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:21,226 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2021-11-21 01:03:21,227 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 3.357142857142857) internal successors, (94), 27 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) [2021-11-21 01:03:21,227 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2021-11-21 01:03:21,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-21 01:03:21,227 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:21,227 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 1, 1, 1, 1] [2021-11-21 01:03:21,253 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2021-11-21 01:03:21,428 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:21,428 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:21,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:21,428 INFO L85 PathProgramCache]: Analyzing trace with hash -2111336205, now seen corresponding path program 43 times [2021-11-21 01:03:21,428 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:21,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626844829] [2021-11-21 01:03:21,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:21,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:21,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:22,373 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 737 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:22,373 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:22,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1626844829] [2021-11-21 01:03:22,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1626844829] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:22,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1608776765] [2021-11-21 01:03:22,374 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:03:22,374 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:22,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:22,375 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:22,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-21 01:03:22,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:22,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-21 01:03:22,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:22,685 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 737 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:22,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:22,935 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 737 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:22,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1608776765] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:22,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [24229879] [2021-11-21 01:03:22,936 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:03:22,937 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:22,937 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:22,937 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:22,937 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:23,669 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:23,963 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:23,963 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:23,964 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 48 [2021-11-21 01:03:23,964 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948057625] [2021-11-21 01:03:23,964 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:23,964 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-21 01:03:23,964 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:23,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-21 01:03:23,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=640, Invalid=2222, Unknown=0, NotChecked=0, Total=2862 [2021-11-21 01:03:23,965 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand has 49 states, 49 states have (on average 1.9387755102040816) internal successors, (95), 48 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) [2021-11-21 01:03:24,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:24,824 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2021-11-21 01:03:24,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-21 01:03:24,824 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.9387755102040816) internal successors, (95), 48 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 93 [2021-11-21 01:03:24,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:24,825 INFO L225 Difference]: With dead ends: 167 [2021-11-21 01:03:24,825 INFO L226 Difference]: Without dead ends: 95 [2021-11-21 01:03:24,826 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 272 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1102 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1238, Invalid=4614, Unknown=0, NotChecked=0, Total=5852 [2021-11-21 01:03:24,829 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 3 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 438 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 438 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:24,829 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 220 Invalid, 443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 438 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:03:24,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-21 01:03:24,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-11-21 01:03:24,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0212765957446808) internal successors, (96), 94 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) [2021-11-21 01:03:24,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 96 transitions. [2021-11-21 01:03:24,880 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 96 transitions. Word has length 93 [2021-11-21 01:03:24,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:24,880 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 96 transitions. [2021-11-21 01:03:24,881 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.9387755102040816) internal successors, (95), 48 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) [2021-11-21 01:03:24,881 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 96 transitions. [2021-11-21 01:03:24,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-21 01:03:24,882 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:24,882 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 1, 1, 1, 1] [2021-11-21 01:03:24,933 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-21 01:03:25,109 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-11-21 01:03:25,109 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:25,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:25,110 INFO L85 PathProgramCache]: Analyzing trace with hash 176863530, now seen corresponding path program 44 times [2021-11-21 01:03:25,110 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:25,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443602794] [2021-11-21 01:03:25,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:25,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:25,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:25,551 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 253 proven. 760 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:25,551 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:25,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443602794] [2021-11-21 01:03:25,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1443602794] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:25,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [238304171] [2021-11-21 01:03:25,552 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:03:25,552 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:25,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:25,553 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:25,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-21 01:03:25,662 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2021-11-21 01:03:25,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:03:25,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-21 01:03:25,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:25,905 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 276 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:25,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:26,217 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 276 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:26,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [238304171] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:26,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1728263135] [2021-11-21 01:03:26,219 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:03:26,219 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:26,220 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:26,220 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:26,221 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:27,006 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:27,243 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:27,243 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:27,243 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 28 [2021-11-21 01:03:27,243 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599743332] [2021-11-21 01:03:27,243 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:27,244 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 01:03:27,244 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:27,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 01:03:27,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=354, Invalid=768, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 01:03:27,245 INFO L87 Difference]: Start difference. First operand 95 states and 96 transitions. Second operand has 29 states, 29 states have (on average 3.3793103448275863) internal successors, (98), 28 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) [2021-11-21 01:03:27,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:27,735 INFO L93 Difference]: Finished difference Result 106 states and 107 transitions. [2021-11-21 01:03:27,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-21 01:03:27,737 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.3793103448275863) internal successors, (98), 28 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 94 [2021-11-21 01:03:27,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:27,738 INFO L225 Difference]: With dead ends: 106 [2021-11-21 01:03:27,738 INFO L226 Difference]: Without dead ends: 104 [2021-11-21 01:03:27,739 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 294 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 884 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1057, Invalid=2365, Unknown=0, NotChecked=0, Total=3422 [2021-11-21 01:03:27,739 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 55 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 249 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:27,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 14 Invalid, 323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 249 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:03:27,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-21 01:03:27,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 98. [2021-11-21 01:03:27,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 97 states have (on average 1.0206185567010309) internal successors, (99), 97 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) [2021-11-21 01:03:27,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 99 transitions. [2021-11-21 01:03:27,756 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 99 transitions. Word has length 94 [2021-11-21 01:03:27,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:27,757 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 99 transitions. [2021-11-21 01:03:27,757 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 3.3793103448275863) internal successors, (98), 28 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) [2021-11-21 01:03:27,757 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 99 transitions. [2021-11-21 01:03:27,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-21 01:03:27,758 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:27,759 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 1, 1, 1, 1] [2021-11-21 01:03:27,806 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-21 01:03:27,973 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-21 01:03:27,973 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:27,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:27,974 INFO L85 PathProgramCache]: Analyzing trace with hash -978629681, now seen corresponding path program 45 times [2021-11-21 01:03:27,974 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:27,974 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437378637] [2021-11-21 01:03:27,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:27,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:28,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:28,871 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 805 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:28,871 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:28,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437378637] [2021-11-21 01:03:28,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437378637] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:28,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2016338256] [2021-11-21 01:03:28,871 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:03:28,872 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:28,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:28,873 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:28,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-21 01:03:28,965 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:03:28,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:03:28,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-21 01:03:28,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:29,257 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 805 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:29,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:29,517 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 805 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:29,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2016338256] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:29,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1169184938] [2021-11-21 01:03:29,518 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:03:29,519 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:29,519 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:29,519 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:29,519 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:30,272 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:30,570 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:30,571 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:30,571 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 50 [2021-11-21 01:03:30,571 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280604648] [2021-11-21 01:03:30,571 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:30,571 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-21 01:03:30,572 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:30,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-21 01:03:30,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=691, Invalid=2389, Unknown=0, NotChecked=0, Total=3080 [2021-11-21 01:03:30,572 INFO L87 Difference]: Start difference. First operand 98 states and 99 transitions. Second operand has 51 states, 51 states have (on average 1.9411764705882353) internal successors, (99), 50 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) [2021-11-21 01:03:31,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:31,351 INFO L93 Difference]: Finished difference Result 174 states and 176 transitions. [2021-11-21 01:03:31,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-21 01:03:31,351 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.9411764705882353) internal successors, (99), 50 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 97 [2021-11-21 01:03:31,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:31,353 INFO L225 Difference]: With dead ends: 174 [2021-11-21 01:03:31,353 INFO L226 Difference]: Without dead ends: 99 [2021-11-21 01:03:31,354 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 284 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1186 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1339, Invalid=4981, Unknown=0, NotChecked=0, Total=6320 [2021-11-21 01:03:31,355 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 3 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 449 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 454 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:31,355 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 226 Invalid, 454 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 449 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:03:31,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-21 01:03:31,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-11-21 01:03:31,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.0204081632653061) internal successors, (100), 98 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:31,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2021-11-21 01:03:31,370 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 97 [2021-11-21 01:03:31,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:31,371 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2021-11-21 01:03:31,371 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.9411764705882353) internal successors, (99), 50 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) [2021-11-21 01:03:31,371 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2021-11-21 01:03:31,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-21 01:03:31,371 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:31,371 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 1, 1, 1, 1] [2021-11-21 01:03:31,398 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2021-11-21 01:03:31,572 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:31,572 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:31,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:31,572 INFO L85 PathProgramCache]: Analyzing trace with hash -1690206074, now seen corresponding path program 46 times [2021-11-21 01:03:31,573 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:31,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436368061] [2021-11-21 01:03:31,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:31,573 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:31,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:32,018 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 276 proven. 829 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:32,018 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:32,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436368061] [2021-11-21 01:03:32,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [436368061] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:32,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409736453] [2021-11-21 01:03:32,019 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:03:32,019 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:32,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:32,022 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:32,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-21 01:03:32,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:32,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-21 01:03:32,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:32,352 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 300 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:32,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:32,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 300 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:32,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [409736453] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:32,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [783932752] [2021-11-21 01:03:32,673 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:03:32,673 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:32,673 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:32,674 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:32,674 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:33,658 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:33,900 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:33,900 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:33,900 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 29 [2021-11-21 01:03:33,900 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088741622] [2021-11-21 01:03:33,900 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:33,901 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-21 01:03:33,902 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:33,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-21 01:03:33,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=810, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 01:03:33,902 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand has 30 states, 30 states have (on average 3.4) internal successors, (102), 29 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:34,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:34,426 INFO L93 Difference]: Finished difference Result 110 states and 111 transitions. [2021-11-21 01:03:34,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-21 01:03:34,426 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.4) internal successors, (102), 29 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 98 [2021-11-21 01:03:34,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:34,427 INFO L225 Difference]: With dead ends: 110 [2021-11-21 01:03:34,427 INFO L226 Difference]: Without dead ends: 108 [2021-11-21 01:03:34,428 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 307 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 946 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1137, Invalid=2523, Unknown=0, NotChecked=0, Total=3660 [2021-11-21 01:03:34,429 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 83 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:34,429 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 16 Invalid, 352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:03:34,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-11-21 01:03:34,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 102. [2021-11-21 01:03:34,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 101 states have (on average 1.0198019801980198) internal successors, (103), 101 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:34,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 103 transitions. [2021-11-21 01:03:34,456 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 103 transitions. Word has length 98 [2021-11-21 01:03:34,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:34,457 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 103 transitions. [2021-11-21 01:03:34,457 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 3.4) internal successors, (102), 29 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:34,457 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 103 transitions. [2021-11-21 01:03:34,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-21 01:03:34,458 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:34,458 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 1, 1, 1, 1] [2021-11-21 01:03:34,485 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2021-11-21 01:03:34,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-21 01:03:34,660 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:34,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:34,661 INFO L85 PathProgramCache]: Analyzing trace with hash 1272248051, now seen corresponding path program 47 times [2021-11-21 01:03:34,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:34,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824858444] [2021-11-21 01:03:34,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:34,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:34,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:35,801 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 876 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:35,802 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:35,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824858444] [2021-11-21 01:03:35,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [824858444] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:35,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [299239115] [2021-11-21 01:03:35,802 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:03:35,802 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:35,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:35,804 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:35,829 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-21 01:03:35,954 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2021-11-21 01:03:35,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:03:35,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-21 01:03:35,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:36,219 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 876 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:36,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:36,456 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 876 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:36,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [299239115] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:36,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1593355923] [2021-11-21 01:03:36,458 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:03:36,459 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:36,459 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:36,459 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:36,459 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:37,198 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:37,506 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:37,506 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:37,506 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 52 [2021-11-21 01:03:37,507 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531263069] [2021-11-21 01:03:37,507 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:37,507 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-21 01:03:37,507 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:37,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-21 01:03:37,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=744, Invalid=2562, Unknown=0, NotChecked=0, Total=3306 [2021-11-21 01:03:37,508 INFO L87 Difference]: Start difference. First operand 102 states and 103 transitions. Second operand has 53 states, 53 states have (on average 1.9433962264150944) internal successors, (103), 52 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:38,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:38,304 INFO L93 Difference]: Finished difference Result 181 states and 183 transitions. [2021-11-21 01:03:38,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-21 01:03:38,305 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.9433962264150944) internal successors, (103), 52 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 101 [2021-11-21 01:03:38,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:38,306 INFO L225 Difference]: With dead ends: 181 [2021-11-21 01:03:38,306 INFO L226 Difference]: Without dead ends: 103 [2021-11-21 01:03:38,307 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 296 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1273 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1444, Invalid=5362, Unknown=0, NotChecked=0, Total=6806 [2021-11-21 01:03:38,308 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 3 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 418 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 418 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:38,308 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 212 Invalid, 425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 418 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:03:38,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-21 01:03:38,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-21 01:03:38,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.0196078431372548) internal successors, (104), 102 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:38,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2021-11-21 01:03:38,339 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 101 [2021-11-21 01:03:38,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:38,339 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2021-11-21 01:03:38,339 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.9433962264150944) internal successors, (103), 52 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:38,340 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2021-11-21 01:03:38,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-21 01:03:38,340 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:38,341 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 1, 1, 1, 1] [2021-11-21 01:03:38,370 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2021-11-21 01:03:38,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-21 01:03:38,554 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:38,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:38,555 INFO L85 PathProgramCache]: Analyzing trace with hash 1296300074, now seen corresponding path program 48 times [2021-11-21 01:03:38,555 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:38,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412145276] [2021-11-21 01:03:38,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:38,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:38,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:39,113 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 300 proven. 901 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:39,113 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:39,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412145276] [2021-11-21 01:03:39,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412145276] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:39,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534087173] [2021-11-21 01:03:39,114 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:03:39,114 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:39,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:39,115 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:39,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-21 01:03:39,230 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:03:39,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:03:39,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-21 01:03:39,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:39,612 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 325 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:39,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:39,953 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 325 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:39,953 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1534087173] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:39,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1628721016] [2021-11-21 01:03:39,959 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:03:39,959 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:39,960 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:39,961 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:39,961 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:40,782 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:41,026 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:41,027 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:41,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 30 [2021-11-21 01:03:41,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110103804] [2021-11-21 01:03:41,027 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:41,027 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-21 01:03:41,027 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:41,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-21 01:03:41,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=407, Invalid=853, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 01:03:41,028 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand has 31 states, 31 states have (on average 3.4193548387096775) internal successors, (106), 30 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:41,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:41,565 INFO L93 Difference]: Finished difference Result 114 states and 115 transitions. [2021-11-21 01:03:41,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-11-21 01:03:41,565 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.4193548387096775) internal successors, (106), 30 states have internal predecessors, (106), 0 states have call successors, (0), 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 [2021-11-21 01:03:41,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:41,567 INFO L225 Difference]: With dead ends: 114 [2021-11-21 01:03:41,567 INFO L226 Difference]: Without dead ends: 112 [2021-11-21 01:03:41,567 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 320 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1010 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1220, Invalid=2686, Unknown=0, NotChecked=0, Total=3906 [2021-11-21 01:03:41,568 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 88 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 255 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 359 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:41,568 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 16 Invalid, 359 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 255 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:03:41,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-21 01:03:41,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 106. [2021-11-21 01:03:41,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.019047619047619) internal successors, (107), 105 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:41,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2021-11-21 01:03:41,589 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 102 [2021-11-21 01:03:41,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:41,589 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2021-11-21 01:03:41,590 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 3.4193548387096775) internal successors, (106), 30 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:41,590 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2021-11-21 01:03:41,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-21 01:03:41,591 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:41,591 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 1, 1, 1, 1] [2021-11-21 01:03:41,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-21 01:03:41,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-21 01:03:41,805 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:41,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:41,806 INFO L85 PathProgramCache]: Analyzing trace with hash 2029366479, now seen corresponding path program 49 times [2021-11-21 01:03:41,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:41,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1222130951] [2021-11-21 01:03:41,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:41,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:41,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:42,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 950 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:42,863 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:42,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1222130951] [2021-11-21 01:03:42,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1222130951] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:42,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1663819937] [2021-11-21 01:03:42,863 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:03:42,863 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:42,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:42,865 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:42,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-21 01:03:42,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:42,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-21 01:03:42,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:43,238 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 950 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:43,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:43,565 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 950 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:43,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1663819937] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:43,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1524572305] [2021-11-21 01:03:43,566 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:03:43,566 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:43,567 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:43,567 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:43,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:44,361 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:44,674 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:44,674 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:44,674 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 54 [2021-11-21 01:03:44,675 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791684323] [2021-11-21 01:03:44,675 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:44,675 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-21 01:03:44,675 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:44,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-21 01:03:44,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=799, Invalid=2741, Unknown=0, NotChecked=0, Total=3540 [2021-11-21 01:03:44,676 INFO L87 Difference]: Start difference. First operand 106 states and 107 transitions. Second operand has 55 states, 55 states have (on average 1.9454545454545455) internal successors, (107), 54 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:45,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:45,500 INFO L93 Difference]: Finished difference Result 188 states and 190 transitions. [2021-11-21 01:03:45,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-21 01:03:45,501 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.9454545454545455) internal successors, (107), 54 states have internal predecessors, (107), 0 states have call successors, (0), 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 105 [2021-11-21 01:03:45,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:45,502 INFO L225 Difference]: With dead ends: 188 [2021-11-21 01:03:45,502 INFO L226 Difference]: Without dead ends: 107 [2021-11-21 01:03:45,503 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 308 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1363 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1553, Invalid=5757, Unknown=0, NotChecked=0, Total=7310 [2021-11-21 01:03:45,504 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 3 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 468 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 468 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:45,504 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 230 Invalid, 474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 468 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:03:45,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-21 01:03:45,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2021-11-21 01:03:45,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.0188679245283019) internal successors, (108), 106 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:45,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2021-11-21 01:03:45,525 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 105 [2021-11-21 01:03:45,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:45,525 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2021-11-21 01:03:45,525 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.9454545454545455) internal successors, (107), 54 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:45,526 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2021-11-21 01:03:45,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-21 01:03:45,527 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:45,527 INFO L514 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 1, 1, 1, 1] [2021-11-21 01:03:45,555 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-21 01:03:45,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2021-11-21 01:03:45,733 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:45,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:45,734 INFO L85 PathProgramCache]: Analyzing trace with hash 1006844550, now seen corresponding path program 50 times [2021-11-21 01:03:45,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:45,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433075621] [2021-11-21 01:03:45,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:45,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:45,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:46,313 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 325 proven. 976 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:46,314 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:46,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1433075621] [2021-11-21 01:03:46,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1433075621] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:46,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18994540] [2021-11-21 01:03:46,314 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:03:46,314 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:46,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:46,318 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:46,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-21 01:03:46,488 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-11-21 01:03:46,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:03:46,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-21 01:03:46,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:46,863 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 351 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:46,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:47,214 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 351 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:47,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [18994540] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:47,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [502835433] [2021-11-21 01:03:47,216 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:03:47,217 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:47,217 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:47,217 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:47,218 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:48,062 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:48,322 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:48,323 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:48,323 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 31 [2021-11-21 01:03:48,323 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297921818] [2021-11-21 01:03:48,323 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:48,323 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-21 01:03:48,323 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:48,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-21 01:03:48,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=897, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 01:03:48,324 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand has 32 states, 32 states have (on average 3.4375) internal successors, (110), 31 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:48,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:48,887 INFO L93 Difference]: Finished difference Result 118 states and 119 transitions. [2021-11-21 01:03:48,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-21 01:03:48,887 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.4375) internal successors, (110), 31 states have internal predecessors, (110), 0 states have call successors, (0), 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 106 [2021-11-21 01:03:48,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:48,889 INFO L225 Difference]: With dead ends: 118 [2021-11-21 01:03:48,889 INFO L226 Difference]: Without dead ends: 116 [2021-11-21 01:03:48,890 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 333 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1076 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1306, Invalid=2854, Unknown=0, NotChecked=0, Total=4160 [2021-11-21 01:03:48,890 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 89 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:48,891 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 17 Invalid, 355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 246 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:03:48,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-21 01:03:48,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 110. [2021-11-21 01:03:48,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 109 states have (on average 1.018348623853211) internal successors, (111), 109 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:48,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 111 transitions. [2021-11-21 01:03:48,913 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 111 transitions. Word has length 106 [2021-11-21 01:03:48,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:48,914 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 111 transitions. [2021-11-21 01:03:48,914 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 3.4375) internal successors, (110), 31 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:48,914 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 111 transitions. [2021-11-21 01:03:48,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-21 01:03:48,915 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:48,915 INFO L514 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 1, 1, 1, 1] [2021-11-21 01:03:48,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-21 01:03:49,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:49,141 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:49,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:49,142 INFO L85 PathProgramCache]: Analyzing trace with hash -1140785933, now seen corresponding path program 51 times [2021-11-21 01:03:49,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:49,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2120565306] [2021-11-21 01:03:49,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:49,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:49,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:50,454 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 1027 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:50,454 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:50,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2120565306] [2021-11-21 01:03:50,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2120565306] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:50,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1561925689] [2021-11-21 01:03:50,455 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:03:50,455 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:50,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:50,456 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:50,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-21 01:03:50,568 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:03:50,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:03:50,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-21 01:03:50,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:50,960 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 1027 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:50,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:51,216 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 1027 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:51,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1561925689] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:51,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [786240225] [2021-11-21 01:03:51,217 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:03:51,218 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:51,218 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:51,218 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:51,218 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:51,972 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:52,295 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:52,295 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:52,296 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 56 [2021-11-21 01:03:52,296 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776469309] [2021-11-21 01:03:52,296 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:52,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-21 01:03:52,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:52,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-21 01:03:52,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=856, Invalid=2926, Unknown=0, NotChecked=0, Total=3782 [2021-11-21 01:03:52,297 INFO L87 Difference]: Start difference. First operand 110 states and 111 transitions. Second operand has 57 states, 57 states have (on average 1.9473684210526316) internal successors, (111), 56 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:53,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:53,102 INFO L93 Difference]: Finished difference Result 195 states and 197 transitions. [2021-11-21 01:03:53,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-11-21 01:03:53,102 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.9473684210526316) internal successors, (111), 56 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 109 [2021-11-21 01:03:53,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:53,103 INFO L225 Difference]: With dead ends: 195 [2021-11-21 01:03:53,104 INFO L226 Difference]: Without dead ends: 111 [2021-11-21 01:03:53,105 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 407 GetRequests, 320 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1456 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1666, Invalid=6166, Unknown=0, NotChecked=0, Total=7832 [2021-11-21 01:03:53,105 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 3 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 309 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 309 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:53,106 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 151 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 309 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:03:53,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-21 01:03:53,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-11-21 01:03:53,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.018181818181818) internal successors, (112), 110 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:53,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 112 transitions. [2021-11-21 01:03:53,124 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 112 transitions. Word has length 109 [2021-11-21 01:03:53,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:53,124 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 112 transitions. [2021-11-21 01:03:53,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 1.9473684210526316) internal successors, (111), 56 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:53,125 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 112 transitions. [2021-11-21 01:03:53,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-21 01:03:53,125 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:53,125 INFO L514 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 1, 1, 1, 1] [2021-11-21 01:03:53,152 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-21 01:03:53,326 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:53,326 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:53,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:53,327 INFO L85 PathProgramCache]: Analyzing trace with hash -40708310, now seen corresponding path program 52 times [2021-11-21 01:03:53,327 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:53,327 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335559316] [2021-11-21 01:03:53,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:53,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:53,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:53,910 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 351 proven. 1054 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:53,910 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:53,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335559316] [2021-11-21 01:03:53,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1335559316] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:53,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1964244057] [2021-11-21 01:03:53,910 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:03:53,910 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:53,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:53,911 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:53,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-21 01:03:54,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:54,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-21 01:03:54,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:54,307 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 378 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:54,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:54,612 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 378 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:54,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1964244057] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:54,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [554697455] [2021-11-21 01:03:54,613 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:03:54,613 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:54,614 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:54,614 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:54,614 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:55,399 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:55,651 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:55,651 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:55,652 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 32 [2021-11-21 01:03:55,652 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474041335] [2021-11-21 01:03:55,652 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:55,652 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-21 01:03:55,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:55,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-21 01:03:55,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=942, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 01:03:55,653 INFO L87 Difference]: Start difference. First operand 111 states and 112 transitions. Second operand has 33 states, 33 states have (on average 3.4545454545454546) internal successors, (114), 32 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:56,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:56,266 INFO L93 Difference]: Finished difference Result 122 states and 123 transitions. [2021-11-21 01:03:56,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-21 01:03:56,266 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.4545454545454546) internal successors, (114), 32 states have internal predecessors, (114), 0 states have call successors, (0), 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 110 [2021-11-21 01:03:56,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:56,267 INFO L225 Difference]: With dead ends: 122 [2021-11-21 01:03:56,267 INFO L226 Difference]: Without dead ends: 120 [2021-11-21 01:03:56,268 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 346 SyntacticMatches, 2 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1144 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1395, Invalid=3027, Unknown=0, NotChecked=0, Total=4422 [2021-11-21 01:03:56,269 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 90 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 112 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 414 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:56,269 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 14 Invalid, 414 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:03:56,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-21 01:03:56,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 114. [2021-11-21 01:03:56,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 113 states have (on average 1.0176991150442478) internal successors, (115), 113 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:56,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 115 transitions. [2021-11-21 01:03:56,292 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 115 transitions. Word has length 110 [2021-11-21 01:03:56,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:56,293 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 115 transitions. [2021-11-21 01:03:56,293 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 3.4545454545454546) internal successors, (114), 32 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:03:56,293 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 115 transitions. [2021-11-21 01:03:56,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-21 01:03:56,294 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:56,295 INFO L514 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 1, 1, 1, 1] [2021-11-21 01:03:56,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-21 01:03:56,517 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:56,517 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:56,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:56,518 INFO L85 PathProgramCache]: Analyzing trace with hash -1555665457, now seen corresponding path program 53 times [2021-11-21 01:03:56,518 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:56,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137365450] [2021-11-21 01:03:56,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:56,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:56,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:57,781 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 1107 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:57,781 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:57,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [137365450] [2021-11-21 01:03:57,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [137365450] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:57,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1480370747] [2021-11-21 01:03:57,782 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:03:57,782 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:57,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:57,783 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:57,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-21 01:03:57,932 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2021-11-21 01:03:57,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:03:57,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-21 01:03:57,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:58,285 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 1107 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:58,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:58,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 1107 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:58,560 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1480370747] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:58,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [58524325] [2021-11-21 01:03:58,562 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:03:58,562 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:58,562 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:58,562 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:58,563 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:59,357 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:59,684 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:03:59,685 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:59,685 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 58 [2021-11-21 01:03:59,685 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639173708] [2021-11-21 01:03:59,685 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:03:59,685 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-21 01:03:59,686 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:59,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-21 01:03:59,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=915, Invalid=3117, Unknown=0, NotChecked=0, Total=4032 [2021-11-21 01:03:59,687 INFO L87 Difference]: Start difference. First operand 114 states and 115 transitions. Second operand has 59 states, 59 states have (on average 1.9491525423728813) internal successors, (115), 58 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:00,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:00,571 INFO L93 Difference]: Finished difference Result 202 states and 204 transitions. [2021-11-21 01:04:00,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-21 01:04:00,571 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.9491525423728813) internal successors, (115), 58 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2021-11-21 01:04:00,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:00,572 INFO L225 Difference]: With dead ends: 202 [2021-11-21 01:04:00,572 INFO L226 Difference]: Without dead ends: 115 [2021-11-21 01:04:00,574 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 332 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1552 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1783, Invalid=6589, Unknown=0, NotChecked=0, Total=8372 [2021-11-21 01:04:00,574 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 3 mSDsluCounter, 191 mSDsCounter, 0 mSdLazyCounter, 437 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:00,574 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 220 Invalid, 440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 437 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:04:00,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-21 01:04:00,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2021-11-21 01:04:00,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 114 states have (on average 1.0175438596491229) internal successors, (116), 114 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:00,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2021-11-21 01:04:00,598 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 113 [2021-11-21 01:04:00,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:00,598 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2021-11-21 01:04:00,598 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.9491525423728813) internal successors, (115), 58 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:00,598 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2021-11-21 01:04:00,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-21 01:04:00,599 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:00,600 INFO L514 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 1, 1, 1, 1] [2021-11-21 01:04:00,642 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-21 01:04:00,825 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:00,825 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:00,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:00,826 INFO L85 PathProgramCache]: Analyzing trace with hash -1218292602, now seen corresponding path program 54 times [2021-11-21 01:04:00,826 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:00,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101601534] [2021-11-21 01:04:00,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:00,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:00,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:01,425 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 378 proven. 1135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:01,425 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:01,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101601534] [2021-11-21 01:04:01,425 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2101601534] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:04:01,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1483740100] [2021-11-21 01:04:01,426 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:04:01,426 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:01,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:04:01,427 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:04:01,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-21 01:04:01,532 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:04:01,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:04:01,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-21 01:04:01,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:04:01,880 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 406 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:01,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:04:02,172 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 406 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:02,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1483740100] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:04:02,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [169011153] [2021-11-21 01:04:02,173 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:04:02,173 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:04:02,174 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:04:02,174 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:04:02,174 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:04:02,932 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:04:03,187 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:04:03,188 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:03,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 33 [2021-11-21 01:04:03,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538507969] [2021-11-21 01:04:03,188 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:04:03,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-21 01:04:03,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:03,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-21 01:04:03,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=494, Invalid=988, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 01:04:03,190 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand has 34 states, 34 states have (on average 3.4705882352941178) internal successors, (118), 33 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:03,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:03,832 INFO L93 Difference]: Finished difference Result 126 states and 127 transitions. [2021-11-21 01:04:03,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-21 01:04:03,832 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.4705882352941178) internal successors, (118), 33 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2021-11-21 01:04:03,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:03,833 INFO L225 Difference]: With dead ends: 126 [2021-11-21 01:04:03,834 INFO L226 Difference]: Without dead ends: 124 [2021-11-21 01:04:03,834 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 359 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1214 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1487, Invalid=3205, Unknown=0, NotChecked=0, Total=4692 [2021-11-21 01:04:03,835 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 94 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 276 mSolverCounterSat, 117 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:03,835 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 13 Invalid, 393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [117 Valid, 276 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:04:03,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-21 01:04:03,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 118. [2021-11-21 01:04:03,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.017094017094017) internal successors, (119), 117 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:03,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2021-11-21 01:04:03,860 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 114 [2021-11-21 01:04:03,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:03,860 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2021-11-21 01:04:03,860 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 3.4705882352941178) internal successors, (118), 33 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:03,861 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2021-11-21 01:04:03,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-21 01:04:03,861 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:03,862 INFO L514 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 1, 1, 1, 1] [2021-11-21 01:04:03,906 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2021-11-21 01:04:04,077 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-11-21 01:04:04,078 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:04,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:04,078 INFO L85 PathProgramCache]: Analyzing trace with hash -1676434701, now seen corresponding path program 55 times [2021-11-21 01:04:04,078 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:04,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640995216] [2021-11-21 01:04:04,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:04,078 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:04,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:05,371 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1190 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:05,371 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:05,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640995216] [2021-11-21 01:04:05,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640995216] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:04:05,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1928156674] [2021-11-21 01:04:05,372 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:04:05,372 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:05,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:04:05,373 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:04:05,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-21 01:04:05,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:05,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-21 01:04:05,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:04:05,836 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1190 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:05,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:04:06,189 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1190 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:06,190 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1928156674] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:04:06,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [705339524] [2021-11-21 01:04:06,191 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:04:06,191 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:04:06,191 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:04:06,192 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:04:06,192 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:04:06,958 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:04:07,291 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:04:07,291 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:07,292 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 60 [2021-11-21 01:04:07,292 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000403940] [2021-11-21 01:04:07,292 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:04:07,292 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-21 01:04:07,292 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:07,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-21 01:04:07,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=976, Invalid=3314, Unknown=0, NotChecked=0, Total=4290 [2021-11-21 01:04:07,293 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand has 61 states, 61 states have (on average 1.9508196721311475) internal successors, (119), 60 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:08,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:08,257 INFO L93 Difference]: Finished difference Result 209 states and 211 transitions. [2021-11-21 01:04:08,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-11-21 01:04:08,257 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.9508196721311475) internal successors, (119), 60 states have internal predecessors, (119), 0 states have call successors, (0), 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 117 [2021-11-21 01:04:08,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:08,259 INFO L225 Difference]: With dead ends: 209 [2021-11-21 01:04:08,259 INFO L226 Difference]: Without dead ends: 119 [2021-11-21 01:04:08,260 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 344 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1651 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1904, Invalid=7026, Unknown=0, NotChecked=0, Total=8930 [2021-11-21 01:04:08,261 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 3 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 473 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 473 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:08,261 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 233 Invalid, 481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 473 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:04:08,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-21 01:04:08,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-11-21 01:04:08,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0169491525423728) internal successors, (120), 118 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:08,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 120 transitions. [2021-11-21 01:04:08,286 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 120 transitions. Word has length 117 [2021-11-21 01:04:08,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:08,287 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 120 transitions. [2021-11-21 01:04:08,287 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 1.9508196721311475) internal successors, (119), 60 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:08,287 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 120 transitions. [2021-11-21 01:04:08,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-21 01:04:08,288 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:08,288 INFO L514 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 1, 1, 1, 1] [2021-11-21 01:04:08,333 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-21 01:04:08,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-11-21 01:04:08,513 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:08,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:08,514 INFO L85 PathProgramCache]: Analyzing trace with hash -572565974, now seen corresponding path program 56 times [2021-11-21 01:04:08,514 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:08,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504291116] [2021-11-21 01:04:08,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:08,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:08,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:09,104 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 406 proven. 1219 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:09,104 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:09,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504291116] [2021-11-21 01:04:09,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504291116] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:04:09,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [572233204] [2021-11-21 01:04:09,105 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:04:09,105 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:09,105 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:04:09,106 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:04:09,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-21 01:04:09,249 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2021-11-21 01:04:09,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:04:09,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 463 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-21 01:04:09,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:04:09,585 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 435 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:09,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:04:09,880 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 435 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:09,881 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [572233204] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:04:09,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [353010707] [2021-11-21 01:04:09,882 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:04:09,883 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:04:09,883 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:04:09,883 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:04:09,884 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:04:10,703 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:04:10,974 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:04:10,974 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:10,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 34 [2021-11-21 01:04:10,975 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709583516] [2021-11-21 01:04:10,975 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:04:10,975 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-21 01:04:10,975 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:10,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-21 01:04:10,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=525, Invalid=1035, Unknown=0, NotChecked=0, Total=1560 [2021-11-21 01:04:10,976 INFO L87 Difference]: Start difference. First operand 119 states and 120 transitions. Second operand has 35 states, 35 states have (on average 3.4857142857142858) internal successors, (122), 34 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) [2021-11-21 01:04:11,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:11,622 INFO L93 Difference]: Finished difference Result 130 states and 131 transitions. [2021-11-21 01:04:11,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-21 01:04:11,623 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.4857142857142858) internal successors, (122), 34 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) Word has length 118 [2021-11-21 01:04:11,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:11,623 INFO L225 Difference]: With dead ends: 130 [2021-11-21 01:04:11,624 INFO L226 Difference]: Without dead ends: 128 [2021-11-21 01:04:11,624 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 443 GetRequests, 372 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1286 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1582, Invalid=3388, Unknown=0, NotChecked=0, Total=4970 [2021-11-21 01:04:11,624 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 66 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:11,625 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 18 Invalid, 392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 300 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:04:11,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-21 01:04:11,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 122. [2021-11-21 01:04:11,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.0165289256198347) internal successors, (123), 121 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:11,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 123 transitions. [2021-11-21 01:04:11,645 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 123 transitions. Word has length 118 [2021-11-21 01:04:11,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:11,646 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 123 transitions. [2021-11-21 01:04:11,646 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.4857142857142858) internal successors, (122), 34 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) [2021-11-21 01:04:11,646 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 123 transitions. [2021-11-21 01:04:11,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-21 01:04:11,647 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:11,647 INFO L514 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 1, 1, 1, 1] [2021-11-21 01:04:11,674 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-21 01:04:11,848 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:11,848 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:11,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:11,848 INFO L85 PathProgramCache]: Analyzing trace with hash -1992978737, now seen corresponding path program 57 times [2021-11-21 01:04:11,849 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:11,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341235539] [2021-11-21 01:04:11,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:11,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:11,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:13,265 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 1276 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:13,265 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:13,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341235539] [2021-11-21 01:04:13,265 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [341235539] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:04:13,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1763119203] [2021-11-21 01:04:13,265 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:04:13,266 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:13,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:04:13,266 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:04:13,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-21 01:04:13,364 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:04:13,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:04:13,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 473 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-21 01:04:13,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:04:13,676 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 1276 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:13,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:04:13,949 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 1276 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:13,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1763119203] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:04:13,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1890103365] [2021-11-21 01:04:13,950 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:04:13,951 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:04:13,951 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:04:13,951 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:04:13,951 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:04:14,684 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:04:14,996 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:04:14,996 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:14,997 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 62 [2021-11-21 01:04:14,997 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371701634] [2021-11-21 01:04:14,997 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:04:14,997 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-21 01:04:14,997 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:14,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-21 01:04:14,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1039, Invalid=3517, Unknown=0, NotChecked=0, Total=4556 [2021-11-21 01:04:14,998 INFO L87 Difference]: Start difference. First operand 122 states and 123 transitions. Second operand has 63 states, 63 states have (on average 1.9523809523809523) internal successors, (123), 62 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:15,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:15,952 INFO L93 Difference]: Finished difference Result 216 states and 218 transitions. [2021-11-21 01:04:15,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-21 01:04:15,952 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.9523809523809523) internal successors, (123), 62 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 121 [2021-11-21 01:04:15,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:15,953 INFO L225 Difference]: With dead ends: 216 [2021-11-21 01:04:15,953 INFO L226 Difference]: Without dead ends: 123 [2021-11-21 01:04:15,954 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 356 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1753 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2029, Invalid=7477, Unknown=0, NotChecked=0, Total=9506 [2021-11-21 01:04:15,954 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 3 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 423 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 426 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 423 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:15,954 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 209 Invalid, 426 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 423 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:04:15,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-21 01:04:15,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2021-11-21 01:04:15,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.0163934426229508) internal successors, (124), 122 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:15,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 124 transitions. [2021-11-21 01:04:15,976 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 124 transitions. Word has length 121 [2021-11-21 01:04:15,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:15,976 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 124 transitions. [2021-11-21 01:04:15,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.9523809523809523) internal successors, (123), 62 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:15,976 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 124 transitions. [2021-11-21 01:04:15,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-21 01:04:15,977 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:15,977 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 1, 1, 1, 1] [2021-11-21 01:04:16,004 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2021-11-21 01:04:16,181 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-21 01:04:16,182 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:16,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:16,182 INFO L85 PathProgramCache]: Analyzing trace with hash -889794938, now seen corresponding path program 58 times [2021-11-21 01:04:16,182 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:16,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617780643] [2021-11-21 01:04:16,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:16,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:16,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:16,914 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 435 proven. 1306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:16,915 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:16,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617780643] [2021-11-21 01:04:16,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1617780643] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:04:16,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434483544] [2021-11-21 01:04:16,915 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:04:16,915 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:16,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:04:16,916 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:04:16,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-21 01:04:17,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:17,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-21 01:04:17,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:04:17,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 465 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:17,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:04:17,715 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 465 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:17,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [434483544] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:04:17,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [770138029] [2021-11-21 01:04:17,716 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:04:17,716 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:04:17,716 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:04:17,716 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:04:17,716 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:04:18,425 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:04:18,668 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:04:18,668 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:18,668 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 35 [2021-11-21 01:04:18,668 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594974423] [2021-11-21 01:04:18,668 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:04:18,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-21 01:04:18,669 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:18,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-21 01:04:18,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=557, Invalid=1083, Unknown=0, NotChecked=0, Total=1640 [2021-11-21 01:04:18,669 INFO L87 Difference]: Start difference. First operand 123 states and 124 transitions. Second operand has 36 states, 36 states have (on average 3.5) internal successors, (126), 35 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:19,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:19,298 INFO L93 Difference]: Finished difference Result 134 states and 135 transitions. [2021-11-21 01:04:19,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-11-21 01:04:19,298 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.5) internal successors, (126), 35 states have internal predecessors, (126), 0 states have call successors, (0), 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 122 [2021-11-21 01:04:19,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:19,299 INFO L225 Difference]: With dead ends: 134 [2021-11-21 01:04:19,299 INFO L226 Difference]: Without dead ends: 132 [2021-11-21 01:04:19,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 385 SyntacticMatches, 2 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1360 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1680, Invalid=3576, Unknown=0, NotChecked=0, Total=5256 [2021-11-21 01:04:19,300 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 101 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 293 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 418 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:19,300 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 11 Invalid, 418 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 293 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:04:19,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-21 01:04:19,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 126. [2021-11-21 01:04:19,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 125 states have (on average 1.016) internal successors, (127), 125 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:19,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 127 transitions. [2021-11-21 01:04:19,316 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 127 transitions. Word has length 122 [2021-11-21 01:04:19,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:19,316 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 127 transitions. [2021-11-21 01:04:19,316 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 3.5) internal successors, (126), 35 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:19,316 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 127 transitions. [2021-11-21 01:04:19,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-21 01:04:19,317 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:19,317 INFO L514 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 1, 1, 1, 1] [2021-11-21 01:04:19,341 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2021-11-21 01:04:19,517 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-21 01:04:19,517 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:19,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:19,518 INFO L85 PathProgramCache]: Analyzing trace with hash 661973235, now seen corresponding path program 59 times [2021-11-21 01:04:19,518 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:19,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388903339] [2021-11-21 01:04:19,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:19,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:19,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:20,890 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 1365 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:20,890 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:20,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388903339] [2021-11-21 01:04:20,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [388903339] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:04:20,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1169769790] [2021-11-21 01:04:20,891 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:04:20,891 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:20,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:04:20,892 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:04:20,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-21 01:04:21,021 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2021-11-21 01:04:21,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:04:21,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 488 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-21 01:04:21,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:04:21,289 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 1365 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:21,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:04:21,527 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 1365 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:21,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1169769790] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:04:21,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1590526894] [2021-11-21 01:04:21,528 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:04:21,528 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:04:21,528 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:04:21,528 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:04:21,528 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:04:22,199 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:04:22,538 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:04:22,539 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:22,539 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 64 [2021-11-21 01:04:22,539 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029503604] [2021-11-21 01:04:22,539 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:04:22,540 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-21 01:04:22,540 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:22,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-21 01:04:22,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1104, Invalid=3726, Unknown=0, NotChecked=0, Total=4830 [2021-11-21 01:04:22,541 INFO L87 Difference]: Start difference. First operand 126 states and 127 transitions. Second operand has 65 states, 65 states have (on average 1.9538461538461538) internal successors, (127), 64 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:23,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:23,497 INFO L93 Difference]: Finished difference Result 223 states and 225 transitions. [2021-11-21 01:04:23,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-21 01:04:23,498 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.9538461538461538) internal successors, (127), 64 states have internal predecessors, (127), 0 states have call successors, (0), 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 125 [2021-11-21 01:04:23,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:23,498 INFO L225 Difference]: With dead ends: 223 [2021-11-21 01:04:23,498 INFO L226 Difference]: Without dead ends: 127 [2021-11-21 01:04:23,499 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 368 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1858 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2158, Invalid=7942, Unknown=0, NotChecked=0, Total=10100 [2021-11-21 01:04:23,500 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 3 mSDsluCounter, 239 mSDsCounter, 0 mSdLazyCounter, 551 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 557 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 551 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:23,500 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 271 Invalid, 557 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 551 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:04:23,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-21 01:04:23,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2021-11-21 01:04:23,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 126 states have (on average 1.0158730158730158) internal successors, (128), 126 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:23,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2021-11-21 01:04:23,516 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 125 [2021-11-21 01:04:23,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:23,516 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2021-11-21 01:04:23,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 1.9538461538461538) internal successors, (127), 64 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:23,516 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2021-11-21 01:04:23,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-21 01:04:23,517 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:23,517 INFO L514 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 1, 1, 1, 1] [2021-11-21 01:04:23,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2021-11-21 01:04:23,721 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:23,721 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:23,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:23,722 INFO L85 PathProgramCache]: Analyzing trace with hash 579958058, now seen corresponding path program 60 times [2021-11-21 01:04:23,722 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:23,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2110014149] [2021-11-21 01:04:23,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:23,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:23,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:24,337 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 465 proven. 1396 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:24,337 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:24,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2110014149] [2021-11-21 01:04:24,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2110014149] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:04:24,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1457378635] [2021-11-21 01:04:24,338 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:04:24,338 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:24,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:04:24,350 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:04:24,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-21 01:04:24,499 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:04:24,499 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:04:24,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-21 01:04:24,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:04:24,927 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 496 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:24,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:04:25,273 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 496 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:25,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1457378635] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:04:25,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [569743536] [2021-11-21 01:04:25,274 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:04:25,274 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:04:25,275 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:04:25,275 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:04:25,275 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:04:26,031 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:04:26,296 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:04:26,296 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:26,296 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 36 [2021-11-21 01:04:26,296 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30956731] [2021-11-21 01:04:26,296 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:04:26,297 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-21 01:04:26,297 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:26,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-21 01:04:26,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=590, Invalid=1132, Unknown=0, NotChecked=0, Total=1722 [2021-11-21 01:04:26,298 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand has 37 states, 37 states have (on average 3.5135135135135136) internal successors, (130), 36 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:27,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:27,021 INFO L93 Difference]: Finished difference Result 138 states and 139 transitions. [2021-11-21 01:04:27,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-21 01:04:27,022 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.5135135135135136) internal successors, (130), 36 states have internal predecessors, (130), 0 states have call successors, (0), 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 126 [2021-11-21 01:04:27,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:27,023 INFO L225 Difference]: With dead ends: 138 [2021-11-21 01:04:27,023 INFO L226 Difference]: Without dead ends: 136 [2021-11-21 01:04:27,024 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 398 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1436 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1781, Invalid=3769, Unknown=0, NotChecked=0, Total=5550 [2021-11-21 01:04:27,025 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 135 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 449 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:27,025 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 17 Invalid, 449 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:04:27,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-21 01:04:27,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 130. [2021-11-21 01:04:27,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 129 states have (on average 1.0155038759689923) internal successors, (131), 129 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:27,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2021-11-21 01:04:27,045 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 126 [2021-11-21 01:04:27,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:27,046 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2021-11-21 01:04:27,046 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 3.5135135135135136) internal successors, (130), 36 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:27,046 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2021-11-21 01:04:27,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-21 01:04:27,047 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:27,047 INFO L514 BasicCegarLoop]: trace histogram [32, 31, 31, 31, 1, 1, 1, 1] [2021-11-21 01:04:27,074 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2021-11-21 01:04:27,249 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable61 [2021-11-21 01:04:27,249 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:27,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:27,250 INFO L85 PathProgramCache]: Analyzing trace with hash -1118105649, now seen corresponding path program 61 times [2021-11-21 01:04:27,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:27,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961199146] [2021-11-21 01:04:27,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:27,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:27,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:28,721 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 1457 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:28,721 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:28,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961199146] [2021-11-21 01:04:28,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [961199146] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:04:28,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1849274420] [2021-11-21 01:04:28,721 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:04:28,721 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:28,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:04:28,722 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:04:28,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-21 01:04:28,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:28,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 66 conjunts are in the unsatisfiable core [2021-11-21 01:04:28,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:04:29,142 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 1457 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:29,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:04:29,448 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 1457 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:29,448 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1849274420] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:04:29,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1091654635] [2021-11-21 01:04:29,449 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:04:29,449 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:04:29,450 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:04:29,450 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:04:29,450 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:04:30,151 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:04:30,487 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:04:30,487 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:30,487 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 66 [2021-11-21 01:04:30,487 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795494703] [2021-11-21 01:04:30,488 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:04:30,488 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-21 01:04:30,488 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:30,488 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-21 01:04:30,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1171, Invalid=3941, Unknown=0, NotChecked=0, Total=5112 [2021-11-21 01:04:30,489 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand has 67 states, 67 states have (on average 1.955223880597015) internal successors, (131), 66 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:31,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:31,431 INFO L93 Difference]: Finished difference Result 230 states and 232 transitions. [2021-11-21 01:04:31,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-11-21 01:04:31,431 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.955223880597015) internal successors, (131), 66 states have internal predecessors, (131), 0 states have call successors, (0), 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 129 [2021-11-21 01:04:31,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:31,432 INFO L225 Difference]: With dead ends: 230 [2021-11-21 01:04:31,432 INFO L226 Difference]: Without dead ends: 131 [2021-11-21 01:04:31,433 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 380 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1966 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2291, Invalid=8421, Unknown=0, NotChecked=0, Total=10712 [2021-11-21 01:04:31,433 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 3 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 331 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 331 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:31,433 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 158 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 331 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:04:31,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-11-21 01:04:31,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2021-11-21 01:04:31,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.0153846153846153) internal successors, (132), 130 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:31,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 132 transitions. [2021-11-21 01:04:31,457 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 132 transitions. Word has length 129 [2021-11-21 01:04:31,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:31,457 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 132 transitions. [2021-11-21 01:04:31,457 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 1.955223880597015) internal successors, (131), 66 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:31,457 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 132 transitions. [2021-11-21 01:04:31,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-21 01:04:31,458 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:31,458 INFO L514 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 1, 1, 1, 1] [2021-11-21 01:04:31,483 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Ended with exit code 0 [2021-11-21 01:04:31,661 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:31,661 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:31,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:31,662 INFO L85 PathProgramCache]: Analyzing trace with hash -2108118906, now seen corresponding path program 62 times [2021-11-21 01:04:31,662 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:31,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1776333851] [2021-11-21 01:04:31,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:31,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:31,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:32,248 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 496 proven. 1489 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:32,248 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:32,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1776333851] [2021-11-21 01:04:32,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1776333851] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:04:32,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [49635612] [2021-11-21 01:04:32,249 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:04:32,249 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:32,249 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:04:32,250 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:04:32,251 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-21 01:04:32,397 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2021-11-21 01:04:32,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:04:32,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-21 01:04:32,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:04:32,702 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 528 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:32,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:04:33,004 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 528 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:33,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [49635612] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:04:33,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1647738318] [2021-11-21 01:04:33,005 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:04:33,006 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:04:33,006 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:04:33,006 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:04:33,006 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:04:33,689 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:04:33,932 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:04:33,932 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:33,932 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 37 [2021-11-21 01:04:33,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204885548] [2021-11-21 01:04:33,932 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:04:33,933 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-21 01:04:33,933 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:33,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-21 01:04:33,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=624, Invalid=1182, Unknown=0, NotChecked=0, Total=1806 [2021-11-21 01:04:33,934 INFO L87 Difference]: Start difference. First operand 131 states and 132 transitions. Second operand has 38 states, 38 states have (on average 3.526315789473684) internal successors, (134), 37 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:34,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:34,635 INFO L93 Difference]: Finished difference Result 142 states and 143 transitions. [2021-11-21 01:04:34,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-21 01:04:34,636 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.526315789473684) internal successors, (134), 37 states have internal predecessors, (134), 0 states have call successors, (0), 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 130 [2021-11-21 01:04:34,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:34,637 INFO L225 Difference]: With dead ends: 142 [2021-11-21 01:04:34,637 INFO L226 Difference]: Without dead ends: 140 [2021-11-21 01:04:34,638 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 411 SyntacticMatches, 2 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1514 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1885, Invalid=3967, Unknown=0, NotChecked=0, Total=5852 [2021-11-21 01:04:34,638 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 139 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 326 mSolverCounterSat, 164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 164 IncrementalHoareTripleChecker+Valid, 326 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:34,638 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 23 Invalid, 490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [164 Valid, 326 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:04:34,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-21 01:04:34,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 134. [2021-11-21 01:04:34,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 133 states have (on average 1.0150375939849625) internal successors, (135), 133 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:34,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 135 transitions. [2021-11-21 01:04:34,665 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 135 transitions. Word has length 130 [2021-11-21 01:04:34,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:34,665 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 135 transitions. [2021-11-21 01:04:34,665 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.526315789473684) internal successors, (134), 37 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:34,666 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 135 transitions. [2021-11-21 01:04:34,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-21 01:04:34,666 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:34,667 INFO L514 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 1, 1, 1, 1] [2021-11-21 01:04:34,704 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Ended with exit code 0 [2021-11-21 01:04:34,893 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:34,893 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:34,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:34,894 INFO L85 PathProgramCache]: Analyzing trace with hash -1953706253, now seen corresponding path program 63 times [2021-11-21 01:04:34,894 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:34,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1910169570] [2021-11-21 01:04:34,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:34,894 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:34,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:36,299 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1552 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:36,299 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:36,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1910169570] [2021-11-21 01:04:36,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1910169570] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:04:36,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842444816] [2021-11-21 01:04:36,300 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:04:36,300 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:36,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:04:36,302 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:04:36,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-21 01:04:36,402 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:04:36,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:04:36,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-21 01:04:36,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:04:36,813 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1552 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:36,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:04:37,137 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1552 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:37,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842444816] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:04:37,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1990524114] [2021-11-21 01:04:37,139 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:04:37,139 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:04:37,140 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:04:37,140 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:04:37,140 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:04:37,908 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:04:38,232 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:04:38,232 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:38,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 68 [2021-11-21 01:04:38,232 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513469117] [2021-11-21 01:04:38,232 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:04:38,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-21 01:04:38,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:38,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-21 01:04:38,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1240, Invalid=4162, Unknown=0, NotChecked=0, Total=5402 [2021-11-21 01:04:38,234 INFO L87 Difference]: Start difference. First operand 134 states and 135 transitions. Second operand has 69 states, 69 states have (on average 1.9565217391304348) internal successors, (135), 68 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:39,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:39,287 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2021-11-21 01:04:39,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-11-21 01:04:39,288 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 1.9565217391304348) internal successors, (135), 68 states have internal predecessors, (135), 0 states have call successors, (0), 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 133 [2021-11-21 01:04:39,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:39,288 INFO L225 Difference]: With dead ends: 237 [2021-11-21 01:04:39,288 INFO L226 Difference]: Without dead ends: 135 [2021-11-21 01:04:39,289 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 497 GetRequests, 392 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2077 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2428, Invalid=8914, Unknown=0, NotChecked=0, Total=11342 [2021-11-21 01:04:39,290 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 3 mSDsluCounter, 191 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:39,290 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 225 Invalid, 471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:04:39,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-21 01:04:39,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2021-11-21 01:04:39,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 134 states have (on average 1.0149253731343284) internal successors, (136), 134 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:39,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 136 transitions. [2021-11-21 01:04:39,309 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 136 transitions. Word has length 133 [2021-11-21 01:04:39,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:39,309 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 136 transitions. [2021-11-21 01:04:39,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 1.9565217391304348) internal successors, (135), 68 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:39,310 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 136 transitions. [2021-11-21 01:04:39,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-21 01:04:39,310 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:39,310 INFO L514 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 1, 1, 1, 1] [2021-11-21 01:04:39,335 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Ended with exit code 0 [2021-11-21 01:04:39,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:39,513 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:39,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:39,514 INFO L85 PathProgramCache]: Analyzing trace with hash -233753558, now seen corresponding path program 64 times [2021-11-21 01:04:39,514 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:39,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1958653224] [2021-11-21 01:04:39,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:39,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:39,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:40,210 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 528 proven. 1585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:40,210 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:40,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1958653224] [2021-11-21 01:04:40,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1958653224] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:04:40,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1883284053] [2021-11-21 01:04:40,210 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:04:40,210 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:40,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:04:40,211 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:04:40,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-21 01:04:40,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:40,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 523 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-21 01:04:40,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:04:40,628 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 561 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:40,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:04:40,995 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 561 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:40,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1883284053] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:04:40,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1754830364] [2021-11-21 01:04:40,997 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:04:40,998 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:04:40,998 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:04:40,998 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:04:40,998 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:04:41,762 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:04:42,022 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:04:42,022 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:42,022 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 38 [2021-11-21 01:04:42,022 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045778435] [2021-11-21 01:04:42,022 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:04:42,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-21 01:04:42,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:42,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-21 01:04:42,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=659, Invalid=1233, Unknown=0, NotChecked=0, Total=1892 [2021-11-21 01:04:42,023 INFO L87 Difference]: Start difference. First operand 135 states and 136 transitions. Second operand has 39 states, 39 states have (on average 3.5384615384615383) internal successors, (138), 38 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:42,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:42,757 INFO L93 Difference]: Finished difference Result 146 states and 147 transitions. [2021-11-21 01:04:42,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-11-21 01:04:42,757 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.5384615384615383) internal successors, (138), 38 states have internal predecessors, (138), 0 states have call successors, (0), 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 134 [2021-11-21 01:04:42,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:42,758 INFO L225 Difference]: With dead ends: 146 [2021-11-21 01:04:42,758 INFO L226 Difference]: Without dead ends: 144 [2021-11-21 01:04:42,759 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 424 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1594 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1992, Invalid=4170, Unknown=0, NotChecked=0, Total=6162 [2021-11-21 01:04:42,759 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 108 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:42,760 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 20 Invalid, 485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:04:42,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-11-21 01:04:42,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 138. [2021-11-21 01:04:42,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 137 states have (on average 1.0145985401459854) internal successors, (139), 137 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:42,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 139 transitions. [2021-11-21 01:04:42,780 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 139 transitions. Word has length 134 [2021-11-21 01:04:42,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:42,781 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 139 transitions. [2021-11-21 01:04:42,781 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 3.5384615384615383) internal successors, (138), 38 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:42,781 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 139 transitions. [2021-11-21 01:04:42,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-21 01:04:42,782 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:42,782 INFO L514 BasicCegarLoop]: trace histogram [34, 33, 33, 33, 1, 1, 1, 1] [2021-11-21 01:04:42,809 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2021-11-21 01:04:42,989 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:42,989 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:42,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:42,990 INFO L85 PathProgramCache]: Analyzing trace with hash -1605439281, now seen corresponding path program 65 times [2021-11-21 01:04:42,990 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:42,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1287867337] [2021-11-21 01:04:42,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:42,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:43,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:44,462 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1650 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:44,462 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:44,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1287867337] [2021-11-21 01:04:44,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1287867337] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:04:44,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1522296684] [2021-11-21 01:04:44,463 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:04:44,463 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:44,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:04:44,464 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:04:44,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-21 01:04:44,618 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2021-11-21 01:04:44,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:04:44,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 533 conjuncts, 70 conjunts are in the unsatisfiable core [2021-11-21 01:04:44,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:04:44,940 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1650 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:44,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:04:45,239 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1650 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:45,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1522296684] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:04:45,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1371192140] [2021-11-21 01:04:45,240 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:04:45,240 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:04:45,240 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:04:45,241 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:04:45,241 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:04:45,958 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:04:46,293 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:04:46,293 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:46,293 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 70 [2021-11-21 01:04:46,293 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422109433] [2021-11-21 01:04:46,293 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:04:46,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-21 01:04:46,294 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:46,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-21 01:04:46,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1311, Invalid=4389, Unknown=0, NotChecked=0, Total=5700 [2021-11-21 01:04:46,295 INFO L87 Difference]: Start difference. First operand 138 states and 139 transitions. Second operand has 71 states, 71 states have (on average 1.9577464788732395) internal successors, (139), 70 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:47,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:47,482 INFO L93 Difference]: Finished difference Result 244 states and 246 transitions. [2021-11-21 01:04:47,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-21 01:04:47,482 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.9577464788732395) internal successors, (139), 70 states have internal predecessors, (139), 0 states have call successors, (0), 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 137 [2021-11-21 01:04:47,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:47,483 INFO L225 Difference]: With dead ends: 244 [2021-11-21 01:04:47,483 INFO L226 Difference]: Without dead ends: 139 [2021-11-21 01:04:47,484 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 404 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2191 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2569, Invalid=9421, Unknown=0, NotChecked=0, Total=11990 [2021-11-21 01:04:47,485 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 3 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 612 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 619 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 612 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:47,485 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 298 Invalid, 619 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 612 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:04:47,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-11-21 01:04:47,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2021-11-21 01:04:47,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 138 states have (on average 1.0144927536231885) internal successors, (140), 138 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:47,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2021-11-21 01:04:47,505 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 137 [2021-11-21 01:04:47,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:47,506 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2021-11-21 01:04:47,506 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 1.9577464788732395) internal successors, (139), 70 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:47,506 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2021-11-21 01:04:47,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-21 01:04:47,506 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:47,507 INFO L514 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 1, 1, 1, 1] [2021-11-21 01:04:47,532 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2021-11-21 01:04:47,709 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-11-21 01:04:47,709 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:47,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:47,710 INFO L85 PathProgramCache]: Analyzing trace with hash -1222647162, now seen corresponding path program 66 times [2021-11-21 01:04:47,710 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:47,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1216152202] [2021-11-21 01:04:47,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:47,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:47,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:48,344 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 561 proven. 1684 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:48,344 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:48,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1216152202] [2021-11-21 01:04:48,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1216152202] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:04:48,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1523235336] [2021-11-21 01:04:48,344 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:04:48,345 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:48,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:04:48,345 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:04:48,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-21 01:04:48,465 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:04:48,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:04:48,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 538 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-21 01:04:48,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:04:48,784 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 595 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:48,784 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:04:49,096 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 595 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:49,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1523235336] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:04:49,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2037600431] [2021-11-21 01:04:49,098 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:04:49,098 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:04:49,098 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:04:49,099 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:04:49,099 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:04:49,802 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:04:50,040 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:04:50,040 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:50,040 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 39 [2021-11-21 01:04:50,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278669946] [2021-11-21 01:04:50,041 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:04:50,041 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-21 01:04:50,041 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:50,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-21 01:04:50,042 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=695, Invalid=1285, Unknown=0, NotChecked=0, Total=1980 [2021-11-21 01:04:50,042 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand has 40 states, 40 states have (on average 3.55) internal successors, (142), 39 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:50,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:50,770 INFO L93 Difference]: Finished difference Result 150 states and 151 transitions. [2021-11-21 01:04:50,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-11-21 01:04:50,770 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 3.55) internal successors, (142), 39 states have internal predecessors, (142), 0 states have call successors, (0), 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 138 [2021-11-21 01:04:50,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:50,771 INFO L225 Difference]: With dead ends: 150 [2021-11-21 01:04:50,771 INFO L226 Difference]: Without dead ends: 148 [2021-11-21 01:04:50,772 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 518 GetRequests, 437 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1676 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=2102, Invalid=4378, Unknown=0, NotChecked=0, Total=6480 [2021-11-21 01:04:50,772 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 112 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 326 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 326 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:50,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 19 Invalid, 467 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 326 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:04:50,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-21 01:04:50,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 142. [2021-11-21 01:04:50,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 141 states have (on average 1.0141843971631206) internal successors, (143), 141 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:50,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2021-11-21 01:04:50,792 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 138 [2021-11-21 01:04:50,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:50,793 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2021-11-21 01:04:50,793 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 3.55) internal successors, (142), 39 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:50,793 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2021-11-21 01:04:50,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-21 01:04:50,793 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:50,794 INFO L514 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 1, 1, 1, 1] [2021-11-21 01:04:50,817 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2021-11-21 01:04:50,994 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-11-21 01:04:50,994 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:50,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:50,995 INFO L85 PathProgramCache]: Analyzing trace with hash 1740854515, now seen corresponding path program 67 times [2021-11-21 01:04:50,995 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:50,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2095341554] [2021-11-21 01:04:50,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:50,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:51,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:52,506 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1751 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:52,506 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:52,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2095341554] [2021-11-21 01:04:52,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2095341554] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:04:52,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1089876850] [2021-11-21 01:04:52,507 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:04:52,507 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:52,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:04:52,508 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:04:52,509 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2021-11-21 01:04:52,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:52,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-21 01:04:52,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:04:52,933 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1751 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:52,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:04:53,243 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1751 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:53,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1089876850] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:04:53,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1098839331] [2021-11-21 01:04:53,244 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:04:53,244 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:04:53,244 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:04:53,244 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:04:53,244 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:04:53,914 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:04:54,247 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:04:54,247 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:54,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 72 [2021-11-21 01:04:54,248 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715870622] [2021-11-21 01:04:54,248 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:04:54,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-21 01:04:54,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:54,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-21 01:04:54,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1384, Invalid=4622, Unknown=0, NotChecked=0, Total=6006 [2021-11-21 01:04:54,249 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand has 73 states, 73 states have (on average 1.9589041095890412) internal successors, (143), 72 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:55,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:55,565 INFO L93 Difference]: Finished difference Result 251 states and 253 transitions. [2021-11-21 01:04:55,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-11-21 01:04:55,566 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.9589041095890412) internal successors, (143), 72 states have internal predecessors, (143), 0 states have call successors, (0), 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 141 [2021-11-21 01:04:55,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:55,567 INFO L225 Difference]: With dead ends: 251 [2021-11-21 01:04:55,567 INFO L226 Difference]: Without dead ends: 143 [2021-11-21 01:04:55,568 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 527 GetRequests, 416 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2308 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2714, Invalid=9942, Unknown=0, NotChecked=0, Total=12656 [2021-11-21 01:04:55,569 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 3 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 774 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 385 SdHoareTripleChecker+Invalid, 779 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 774 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:55,569 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 385 Invalid, 779 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 774 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:04:55,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-11-21 01:04:55,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2021-11-21 01:04:55,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.0140845070422535) internal successors, (144), 142 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:55,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 144 transitions. [2021-11-21 01:04:55,603 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 144 transitions. Word has length 141 [2021-11-21 01:04:55,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:55,603 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 144 transitions. [2021-11-21 01:04:55,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 1.9589041095890412) internal successors, (143), 72 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:55,604 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 144 transitions. [2021-11-21 01:04:55,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-21 01:04:55,605 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:55,605 INFO L514 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 1, 1, 1, 1] [2021-11-21 01:04:55,646 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Ended with exit code 0 [2021-11-21 01:04:55,821 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:55,821 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:55,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:55,822 INFO L85 PathProgramCache]: Analyzing trace with hash -456748246, now seen corresponding path program 68 times [2021-11-21 01:04:55,822 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:55,822 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1482683755] [2021-11-21 01:04:55,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:55,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:55,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:56,516 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 595 proven. 1786 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:56,516 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:56,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1482683755] [2021-11-21 01:04:56,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1482683755] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:04:56,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1451509321] [2021-11-21 01:04:56,517 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:04:56,517 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:56,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:04:56,517 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:04:56,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-21 01:04:56,669 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2021-11-21 01:04:56,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:04:56,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 553 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-21 01:04:56,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:04:57,002 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 630 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:57,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:04:57,349 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 630 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:57,349 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1451509321] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:04:57,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1923235109] [2021-11-21 01:04:57,350 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:04:57,350 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:04:57,350 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:04:57,350 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:04:57,351 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:04:58,071 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:04:58,347 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:04:58,348 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:58,348 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 40 [2021-11-21 01:04:58,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520512448] [2021-11-21 01:04:58,348 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:04:58,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-21 01:04:58,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:58,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-21 01:04:58,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=732, Invalid=1338, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 01:04:58,349 INFO L87 Difference]: Start difference. First operand 143 states and 144 transitions. Second operand has 41 states, 41 states have (on average 3.5609756097560976) internal successors, (146), 40 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:59,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:59,188 INFO L93 Difference]: Finished difference Result 154 states and 155 transitions. [2021-11-21 01:04:59,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-21 01:04:59,188 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.5609756097560976) internal successors, (146), 40 states have internal predecessors, (146), 0 states have call successors, (0), 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 142 [2021-11-21 01:04:59,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:59,189 INFO L225 Difference]: With dead ends: 154 [2021-11-21 01:04:59,189 INFO L226 Difference]: Without dead ends: 152 [2021-11-21 01:04:59,190 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 533 GetRequests, 450 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1760 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2215, Invalid=4591, Unknown=0, NotChecked=0, Total=6806 [2021-11-21 01:04:59,190 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 152 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 341 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 520 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 341 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:59,191 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 17 Invalid, 520 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 341 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:04:59,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-21 01:04:59,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 146. [2021-11-21 01:04:59,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.013793103448276) internal successors, (147), 145 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:59,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 147 transitions. [2021-11-21 01:04:59,226 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 147 transitions. Word has length 142 [2021-11-21 01:04:59,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:59,226 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 147 transitions. [2021-11-21 01:04:59,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 3.5609756097560976) internal successors, (146), 40 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:04:59,226 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 147 transitions. [2021-11-21 01:04:59,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-21 01:04:59,228 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:59,228 INFO L514 BasicCegarLoop]: trace histogram [36, 35, 35, 35, 1, 1, 1, 1] [2021-11-21 01:04:59,260 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2021-11-21 01:04:59,445 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2021-11-21 01:04:59,445 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:59,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:59,446 INFO L85 PathProgramCache]: Analyzing trace with hash -525782577, now seen corresponding path program 69 times [2021-11-21 01:04:59,446 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:59,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2021297213] [2021-11-21 01:04:59,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:59,446 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:59,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:05:01,219 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 1855 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:01,219 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:05:01,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2021297213] [2021-11-21 01:05:01,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2021297213] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:05:01,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [787083679] [2021-11-21 01:05:01,220 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:05:01,220 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:01,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:05:01,221 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:05:01,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-21 01:05:01,331 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:05:01,332 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:05:01,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 563 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-21 01:05:01,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:05:01,732 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 1855 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:01,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:05:02,057 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 1855 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:02,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [787083679] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:05:02,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1040176780] [2021-11-21 01:05:02,058 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:05:02,058 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:05:02,058 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:05:02,058 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:05:02,058 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:05:02,796 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:05:03,194 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:05:03,194 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:05:03,194 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 74 [2021-11-21 01:05:03,194 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481294160] [2021-11-21 01:05:03,194 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:05:03,195 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2021-11-21 01:05:03,195 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:05:03,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-11-21 01:05:03,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1459, Invalid=4861, Unknown=0, NotChecked=0, Total=6320 [2021-11-21 01:05:03,196 INFO L87 Difference]: Start difference. First operand 146 states and 147 transitions. Second operand has 75 states, 75 states have (on average 1.96) internal successors, (147), 74 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:04,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:05:04,594 INFO L93 Difference]: Finished difference Result 258 states and 260 transitions. [2021-11-21 01:05:04,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-11-21 01:05:04,594 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.96) internal successors, (147), 74 states have internal predecessors, (147), 0 states have call successors, (0), 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 145 [2021-11-21 01:05:04,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:05:04,595 INFO L225 Difference]: With dead ends: 258 [2021-11-21 01:05:04,595 INFO L226 Difference]: Without dead ends: 147 [2021-11-21 01:05:04,597 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 542 GetRequests, 428 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2428 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2863, Invalid=10477, Unknown=0, NotChecked=0, Total=13340 [2021-11-21 01:05:04,597 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 3 mSDsluCounter, 334 mSDsCounter, 0 mSdLazyCounter, 759 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 371 SdHoareTripleChecker+Invalid, 767 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 759 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:05:04,597 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 371 Invalid, 767 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 759 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:05:04,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-21 01:05:04,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2021-11-21 01:05:04,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 146 states have (on average 1.0136986301369864) internal successors, (148), 146 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:04,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 148 transitions. [2021-11-21 01:05:04,642 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 148 transitions. Word has length 145 [2021-11-21 01:05:04,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:05:04,642 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 148 transitions. [2021-11-21 01:05:04,643 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 1.96) internal successors, (147), 74 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:04,643 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 148 transitions. [2021-11-21 01:05:04,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-21 01:05:04,644 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:05:04,644 INFO L514 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 1, 1, 1, 1] [2021-11-21 01:05:04,687 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Ended with exit code 0 [2021-11-21 01:05:04,869 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:04,869 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:05:04,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:05:04,870 INFO L85 PathProgramCache]: Analyzing trace with hash -1864074106, now seen corresponding path program 70 times [2021-11-21 01:05:04,870 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:05:04,870 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953165300] [2021-11-21 01:05:04,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:05:04,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:05:04,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:05:05,597 INFO L134 CoverageAnalysis]: Checked inductivity of 2521 backedges. 630 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:05,597 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:05:05,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953165300] [2021-11-21 01:05:05,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [953165300] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:05:05,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2069246729] [2021-11-21 01:05:05,597 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:05:05,597 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:05,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:05:05,598 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:05:05,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2021-11-21 01:05:05,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:05:05,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 568 conjuncts, 75 conjunts are in the unsatisfiable core [2021-11-21 01:05:05,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:05:06,095 INFO L134 CoverageAnalysis]: Checked inductivity of 2521 backedges. 666 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:06,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:05:06,528 INFO L134 CoverageAnalysis]: Checked inductivity of 2521 backedges. 666 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:06,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2069246729] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:05:06,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1424072556] [2021-11-21 01:05:06,534 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:05:06,534 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:05:06,534 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:05:06,535 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:05:06,535 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:05:07,235 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:05:07,498 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:05:07,498 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:05:07,498 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 41 [2021-11-21 01:05:07,499 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605777212] [2021-11-21 01:05:07,499 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:05:07,499 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-21 01:05:07,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:05:07,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-21 01:05:07,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=770, Invalid=1392, Unknown=0, NotChecked=0, Total=2162 [2021-11-21 01:05:07,500 INFO L87 Difference]: Start difference. First operand 147 states and 148 transitions. Second operand has 42 states, 42 states have (on average 3.5714285714285716) internal successors, (150), 41 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) [2021-11-21 01:05:08,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:05:08,267 INFO L93 Difference]: Finished difference Result 158 states and 159 transitions. [2021-11-21 01:05:08,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-11-21 01:05:08,267 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 3.5714285714285716) internal successors, (150), 41 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 146 [2021-11-21 01:05:08,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:05:08,268 INFO L225 Difference]: With dead ends: 158 [2021-11-21 01:05:08,269 INFO L226 Difference]: Without dead ends: 156 [2021-11-21 01:05:08,269 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 463 SyntacticMatches, 2 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1846 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2331, Invalid=4809, Unknown=0, NotChecked=0, Total=7140 [2021-11-21 01:05:08,270 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 154 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 367 mSolverCounterSat, 184 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 184 IncrementalHoareTripleChecker+Valid, 367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:05:08,270 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [154 Valid, 21 Invalid, 551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [184 Valid, 367 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:05:08,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-11-21 01:05:08,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 150. [2021-11-21 01:05:08,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 149 states have (on average 1.0134228187919463) internal successors, (151), 149 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:08,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2021-11-21 01:05:08,300 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 146 [2021-11-21 01:05:08,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:05:08,300 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2021-11-21 01:05:08,300 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 3.5714285714285716) internal successors, (150), 41 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) [2021-11-21 01:05:08,301 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2021-11-21 01:05:08,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-21 01:05:08,301 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:05:08,302 INFO L514 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 1, 1, 1, 1] [2021-11-21 01:05:08,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Forceful destruction successful, exit code 0 [2021-11-21 01:05:08,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:08,525 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:05:08,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:05:08,526 INFO L85 PathProgramCache]: Analyzing trace with hash 1300265715, now seen corresponding path program 71 times [2021-11-21 01:05:08,526 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:05:08,526 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [243523458] [2021-11-21 01:05:08,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:05:08,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:05:08,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:05:10,293 INFO L134 CoverageAnalysis]: Checked inductivity of 2628 backedges. 1962 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:10,293 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:05:10,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [243523458] [2021-11-21 01:05:10,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [243523458] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:05:10,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1859331308] [2021-11-21 01:05:10,293 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:05:10,293 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:10,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:05:10,294 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:05:10,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-21 01:05:10,467 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2021-11-21 01:05:10,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:05:10,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 578 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-21 01:05:10,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:05:10,895 INFO L134 CoverageAnalysis]: Checked inductivity of 2628 backedges. 1962 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:10,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:05:11,280 INFO L134 CoverageAnalysis]: Checked inductivity of 2628 backedges. 1962 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:11,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1859331308] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:05:11,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1246299589] [2021-11-21 01:05:11,283 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:05:11,283 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:05:11,284 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:05:11,284 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:05:11,284 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:05:12,001 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:05:12,378 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:05:12,379 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:05:12,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 76 [2021-11-21 01:05:12,379 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278156128] [2021-11-21 01:05:12,379 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:05:12,379 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-21 01:05:12,380 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:05:12,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-21 01:05:12,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1536, Invalid=5106, Unknown=0, NotChecked=0, Total=6642 [2021-11-21 01:05:12,381 INFO L87 Difference]: Start difference. First operand 150 states and 151 transitions. Second operand has 77 states, 77 states have (on average 1.9610389610389611) internal successors, (151), 76 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:13,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:05:13,830 INFO L93 Difference]: Finished difference Result 265 states and 267 transitions. [2021-11-21 01:05:13,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-21 01:05:13,830 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 1.9610389610389611) internal successors, (151), 76 states have internal predecessors, (151), 0 states have call successors, (0), 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 149 [2021-11-21 01:05:13,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:05:13,831 INFO L225 Difference]: With dead ends: 265 [2021-11-21 01:05:13,831 INFO L226 Difference]: Without dead ends: 151 [2021-11-21 01:05:13,832 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 557 GetRequests, 440 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2551 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3016, Invalid=11026, Unknown=0, NotChecked=0, Total=14042 [2021-11-21 01:05:13,833 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 3 mSDsluCounter, 299 mSDsCounter, 0 mSdLazyCounter, 694 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 699 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 694 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:05:13,833 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 337 Invalid, 699 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 694 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:05:13,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-11-21 01:05:13,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2021-11-21 01:05:13,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 150 states have (on average 1.0133333333333334) internal successors, (152), 150 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:13,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2021-11-21 01:05:13,856 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 149 [2021-11-21 01:05:13,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:05:13,856 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2021-11-21 01:05:13,856 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 1.9610389610389611) internal successors, (151), 76 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:13,856 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2021-11-21 01:05:13,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-11-21 01:05:13,858 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:05:13,858 INFO L514 BasicCegarLoop]: trace histogram [37, 37, 36, 36, 1, 1, 1, 1] [2021-11-21 01:05:13,888 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Ended with exit code 0 [2021-11-21 01:05:14,069 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable72 [2021-11-21 01:05:14,069 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:05:14,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:05:14,070 INFO L85 PathProgramCache]: Analyzing trace with hash -2061921750, now seen corresponding path program 72 times [2021-11-21 01:05:14,070 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:05:14,070 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214379436] [2021-11-21 01:05:14,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:05:14,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:05:14,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:05:14,899 INFO L134 CoverageAnalysis]: Checked inductivity of 2665 backedges. 666 proven. 1999 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:14,899 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:05:14,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214379436] [2021-11-21 01:05:14,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [214379436] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:05:14,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [416190263] [2021-11-21 01:05:14,910 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:05:14,910 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:14,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:05:14,911 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:05:14,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2021-11-21 01:05:15,027 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:05:15,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:05:15,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 583 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-21 01:05:15,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:05:15,388 INFO L134 CoverageAnalysis]: Checked inductivity of 2665 backedges. 703 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:15,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:05:15,760 INFO L134 CoverageAnalysis]: Checked inductivity of 2665 backedges. 703 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:15,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [416190263] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:05:15,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [393160215] [2021-11-21 01:05:15,761 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:05:15,761 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:05:15,761 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:05:15,761 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:05:15,761 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:05:16,504 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:05:16,782 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:05:16,783 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:05:16,783 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 42 [2021-11-21 01:05:16,783 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774643629] [2021-11-21 01:05:16,783 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:05:16,783 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-21 01:05:16,784 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:05:16,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-21 01:05:16,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=809, Invalid=1447, Unknown=0, NotChecked=0, Total=2256 [2021-11-21 01:05:16,784 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand has 43 states, 43 states have (on average 3.5813953488372094) internal successors, (154), 42 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) [2021-11-21 01:05:17,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:05:17,674 INFO L93 Difference]: Finished difference Result 162 states and 163 transitions. [2021-11-21 01:05:17,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-11-21 01:05:17,675 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.5813953488372094) internal successors, (154), 42 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 150 [2021-11-21 01:05:17,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:05:17,676 INFO L225 Difference]: With dead ends: 162 [2021-11-21 01:05:17,676 INFO L226 Difference]: Without dead ends: 160 [2021-11-21 01:05:17,677 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 563 GetRequests, 476 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1934 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2450, Invalid=5032, Unknown=0, NotChecked=0, Total=7482 [2021-11-21 01:05:17,677 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 158 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 341 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 341 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:05:17,678 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 15 Invalid, 530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 341 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:05:17,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-21 01:05:17,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 154. [2021-11-21 01:05:17,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 153 states have (on average 1.0130718954248366) internal successors, (155), 153 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) [2021-11-21 01:05:17,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2021-11-21 01:05:17,719 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 150 [2021-11-21 01:05:17,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:05:17,719 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2021-11-21 01:05:17,720 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 3.5813953488372094) internal successors, (154), 42 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) [2021-11-21 01:05:17,720 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2021-11-21 01:05:17,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-11-21 01:05:17,721 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:05:17,721 INFO L514 BasicCegarLoop]: trace histogram [38, 37, 37, 37, 1, 1, 1, 1] [2021-11-21 01:05:17,765 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Forceful destruction successful, exit code 0 [2021-11-21 01:05:17,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:17,945 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:05:17,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:05:17,946 INFO L85 PathProgramCache]: Analyzing trace with hash -83766577, now seen corresponding path program 73 times [2021-11-21 01:05:17,946 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:05:17,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1354951683] [2021-11-21 01:05:17,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:05:17,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:05:17,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:05:19,864 INFO L134 CoverageAnalysis]: Checked inductivity of 2775 backedges. 2072 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:19,864 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:05:19,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1354951683] [2021-11-21 01:05:19,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1354951683] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:05:19,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1861273260] [2021-11-21 01:05:19,865 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:05:19,865 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:19,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:05:19,866 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:05:19,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2021-11-21 01:05:19,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:05:19,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 593 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-21 01:05:19,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:05:20,368 INFO L134 CoverageAnalysis]: Checked inductivity of 2775 backedges. 2072 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:20,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:05:20,715 INFO L134 CoverageAnalysis]: Checked inductivity of 2775 backedges. 2072 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:20,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1861273260] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:05:20,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1177529089] [2021-11-21 01:05:20,716 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:05:20,716 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:05:20,716 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:05:20,717 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:05:20,717 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:05:21,467 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:05:21,872 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:05:21,872 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:05:21,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 78 [2021-11-21 01:05:21,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446044450] [2021-11-21 01:05:21,872 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:05:21,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-21 01:05:21,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:05:21,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-21 01:05:21,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1615, Invalid=5357, Unknown=0, NotChecked=0, Total=6972 [2021-11-21 01:05:21,874 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand has 79 states, 79 states have (on average 1.9620253164556962) internal successors, (155), 78 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) [2021-11-21 01:05:23,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:05:23,382 INFO L93 Difference]: Finished difference Result 272 states and 274 transitions. [2021-11-21 01:05:23,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-11-21 01:05:23,382 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.9620253164556962) internal successors, (155), 78 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 153 [2021-11-21 01:05:23,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:05:23,383 INFO L225 Difference]: With dead ends: 272 [2021-11-21 01:05:23,383 INFO L226 Difference]: Without dead ends: 155 [2021-11-21 01:05:23,384 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 452 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2677 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3173, Invalid=11589, Unknown=0, NotChecked=0, Total=14762 [2021-11-21 01:05:23,385 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 3 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 684 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 689 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 684 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:05:23,385 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 333 Invalid, 689 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 684 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:05:23,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-21 01:05:23,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 155. [2021-11-21 01:05:23,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 154 states have (on average 1.0129870129870129) internal successors, (156), 154 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:23,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 156 transitions. [2021-11-21 01:05:23,435 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 156 transitions. Word has length 153 [2021-11-21 01:05:23,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:05:23,435 INFO L470 AbstractCegarLoop]: Abstraction has 155 states and 156 transitions. [2021-11-21 01:05:23,436 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 1.9620253164556962) internal successors, (155), 78 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) [2021-11-21 01:05:23,436 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 156 transitions. [2021-11-21 01:05:23,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-11-21 01:05:23,436 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:05:23,437 INFO L514 BasicCegarLoop]: trace histogram [38, 38, 37, 37, 1, 1, 1, 1] [2021-11-21 01:05:23,463 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Ended with exit code 0 [2021-11-21 01:05:23,637 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:23,637 INFO L402 AbstractCegarLoop]: === Iteration 76 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:05:23,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:05:23,638 INFO L85 PathProgramCache]: Analyzing trace with hash 87979654, now seen corresponding path program 74 times [2021-11-21 01:05:23,638 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:05:23,638 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2096197942] [2021-11-21 01:05:23,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:05:23,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:05:23,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:05:24,510 INFO L134 CoverageAnalysis]: Checked inductivity of 2813 backedges. 703 proven. 2110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:24,510 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:05:24,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2096197942] [2021-11-21 01:05:24,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2096197942] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:05:24,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1913238685] [2021-11-21 01:05:24,511 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:05:24,511 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:24,511 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:05:24,512 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:05:24,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-21 01:05:24,704 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2021-11-21 01:05:24,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:05:24,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 598 conjuncts, 79 conjunts are in the unsatisfiable core [2021-11-21 01:05:24,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:05:25,092 INFO L134 CoverageAnalysis]: Checked inductivity of 2813 backedges. 741 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:25,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:05:25,481 INFO L134 CoverageAnalysis]: Checked inductivity of 2813 backedges. 741 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:25,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1913238685] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:05:25,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [12364142] [2021-11-21 01:05:25,482 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:05:25,482 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:05:25,483 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:05:25,483 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:05:25,483 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:05:26,233 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:05:26,514 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:05:26,514 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:05:26,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 43 [2021-11-21 01:05:26,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021411644] [2021-11-21 01:05:26,514 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:05:26,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-21 01:05:26,515 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:05:26,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-21 01:05:26,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=849, Invalid=1503, Unknown=0, NotChecked=0, Total=2352 [2021-11-21 01:05:26,516 INFO L87 Difference]: Start difference. First operand 155 states and 156 transitions. Second operand has 44 states, 44 states have (on average 3.590909090909091) internal successors, (158), 43 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:27,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:05:27,430 INFO L93 Difference]: Finished difference Result 166 states and 167 transitions. [2021-11-21 01:05:27,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-11-21 01:05:27,431 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.590909090909091) internal successors, (158), 43 states have internal predecessors, (158), 0 states have call successors, (0), 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 154 [2021-11-21 01:05:27,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:05:27,432 INFO L225 Difference]: With dead ends: 166 [2021-11-21 01:05:27,432 INFO L226 Difference]: Without dead ends: 164 [2021-11-21 01:05:27,433 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 489 SyntacticMatches, 2 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2024 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2572, Invalid=5260, Unknown=0, NotChecked=0, Total=7832 [2021-11-21 01:05:27,434 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 166 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 194 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 194 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:05:27,434 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [166 Valid, 13 Invalid, 532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [194 Valid, 338 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:05:27,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-11-21 01:05:27,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 158. [2021-11-21 01:05:27,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 157 states have (on average 1.0127388535031847) internal successors, (159), 157 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:27,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 159 transitions. [2021-11-21 01:05:27,466 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 159 transitions. Word has length 154 [2021-11-21 01:05:27,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:05:27,466 INFO L470 AbstractCegarLoop]: Abstraction has 158 states and 159 transitions. [2021-11-21 01:05:27,466 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 3.590909090909091) internal successors, (158), 43 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:27,466 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 159 transitions. [2021-11-21 01:05:27,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-21 01:05:27,467 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:05:27,467 INFO L514 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 1, 1, 1, 1] [2021-11-21 01:05:27,492 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Ended with exit code 0 [2021-11-21 01:05:27,667 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:27,668 INFO L402 AbstractCegarLoop]: === Iteration 77 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:05:27,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:05:27,668 INFO L85 PathProgramCache]: Analyzing trace with hash 1076642035, now seen corresponding path program 75 times [2021-11-21 01:05:27,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:05:27,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084730157] [2021-11-21 01:05:27,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:05:27,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:05:27,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:05:29,599 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 2185 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:29,599 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:05:29,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084730157] [2021-11-21 01:05:29,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1084730157] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:05:29,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1792512541] [2021-11-21 01:05:29,599 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:05:29,600 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:29,600 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:05:29,600 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:05:29,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2021-11-21 01:05:29,698 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:05:29,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:05:29,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 608 conjuncts, 80 conjunts are in the unsatisfiable core [2021-11-21 01:05:29,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:05:30,054 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 2185 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:30,054 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:05:30,425 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 2185 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:30,425 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1792512541] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:05:30,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1521805565] [2021-11-21 01:05:30,426 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:05:30,426 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:05:30,426 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:05:30,427 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:05:30,427 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:05:31,183 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:05:31,579 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:05:31,579 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:05:31,580 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 80 [2021-11-21 01:05:31,580 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845377760] [2021-11-21 01:05:31,580 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:05:31,580 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2021-11-21 01:05:31,580 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:05:31,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-11-21 01:05:31,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1696, Invalid=5614, Unknown=0, NotChecked=0, Total=7310 [2021-11-21 01:05:31,581 INFO L87 Difference]: Start difference. First operand 158 states and 159 transitions. Second operand has 81 states, 81 states have (on average 1.962962962962963) internal successors, (159), 80 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:33,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:05:33,183 INFO L93 Difference]: Finished difference Result 279 states and 281 transitions. [2021-11-21 01:05:33,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-11-21 01:05:33,183 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 1.962962962962963) internal successors, (159), 80 states have internal predecessors, (159), 0 states have call successors, (0), 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 157 [2021-11-21 01:05:33,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:05:33,184 INFO L225 Difference]: With dead ends: 279 [2021-11-21 01:05:33,184 INFO L226 Difference]: Without dead ends: 159 [2021-11-21 01:05:33,186 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 587 GetRequests, 464 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2806 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3334, Invalid=12166, Unknown=0, NotChecked=0, Total=15500 [2021-11-21 01:05:33,186 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 3 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 732 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 362 SdHoareTripleChecker+Invalid, 739 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 732 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:05:33,186 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 362 Invalid, 739 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 732 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:05:33,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-11-21 01:05:33,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2021-11-21 01:05:33,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 158 states have (on average 1.0126582278481013) internal successors, (160), 158 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) [2021-11-21 01:05:33,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2021-11-21 01:05:33,227 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 157 [2021-11-21 01:05:33,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:05:33,228 INFO L470 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2021-11-21 01:05:33,228 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 81 states have (on average 1.962962962962963) internal successors, (159), 80 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:33,228 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2021-11-21 01:05:33,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-21 01:05:33,229 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:05:33,229 INFO L514 BasicCegarLoop]: trace histogram [39, 39, 38, 38, 1, 1, 1, 1] [2021-11-21 01:05:33,255 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Ended with exit code 0 [2021-11-21 01:05:33,429 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:33,429 INFO L402 AbstractCegarLoop]: === Iteration 78 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:05:33,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:05:33,430 INFO L85 PathProgramCache]: Analyzing trace with hash -814599894, now seen corresponding path program 76 times [2021-11-21 01:05:33,430 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:05:33,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123046521] [2021-11-21 01:05:33,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:05:33,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:05:33,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:05:34,297 INFO L134 CoverageAnalysis]: Checked inductivity of 2965 backedges. 741 proven. 2224 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:34,298 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:05:34,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123046521] [2021-11-21 01:05:34,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2123046521] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:05:34,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50416553] [2021-11-21 01:05:34,298 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:05:34,298 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:34,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:05:34,299 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:05:34,300 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2021-11-21 01:05:34,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:05:34,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 613 conjuncts, 81 conjunts are in the unsatisfiable core [2021-11-21 01:05:34,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:05:34,805 INFO L134 CoverageAnalysis]: Checked inductivity of 2965 backedges. 780 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:34,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:05:35,216 INFO L134 CoverageAnalysis]: Checked inductivity of 2965 backedges. 780 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:35,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [50416553] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:05:35,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1149666022] [2021-11-21 01:05:35,218 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:05:35,218 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:05:35,218 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:05:35,219 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:05:35,219 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:05:35,973 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:05:36,258 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:05:36,258 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:05:36,258 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 44 [2021-11-21 01:05:36,259 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937339770] [2021-11-21 01:05:36,259 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:05:36,259 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-21 01:05:36,259 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:05:36,260 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-21 01:05:36,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=890, Invalid=1560, Unknown=0, NotChecked=0, Total=2450 [2021-11-21 01:05:36,260 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand has 45 states, 45 states have (on average 3.6) internal successors, (162), 44 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:37,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:05:37,248 INFO L93 Difference]: Finished difference Result 170 states and 171 transitions. [2021-11-21 01:05:37,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-11-21 01:05:37,249 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 3.6) internal successors, (162), 44 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 158 [2021-11-21 01:05:37,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:05:37,250 INFO L225 Difference]: With dead ends: 170 [2021-11-21 01:05:37,250 INFO L226 Difference]: Without dead ends: 168 [2021-11-21 01:05:37,250 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 593 GetRequests, 502 SyntacticMatches, 2 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2116 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2697, Invalid=5493, Unknown=0, NotChecked=0, Total=8190 [2021-11-21 01:05:37,251 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 127 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 441 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 601 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 441 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:05:37,251 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 24 Invalid, 601 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 441 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:05:37,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-21 01:05:37,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 162. [2021-11-21 01:05:37,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 161 states have (on average 1.0124223602484472) internal successors, (163), 161 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:37,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 163 transitions. [2021-11-21 01:05:37,293 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 163 transitions. Word has length 158 [2021-11-21 01:05:37,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:05:37,294 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 163 transitions. [2021-11-21 01:05:37,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 3.6) internal successors, (162), 44 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:37,294 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 163 transitions. [2021-11-21 01:05:37,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-21 01:05:37,295 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:05:37,295 INFO L514 BasicCegarLoop]: trace histogram [40, 39, 39, 39, 1, 1, 1, 1] [2021-11-21 01:05:37,336 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Ended with exit code 0 [2021-11-21 01:05:37,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable77 [2021-11-21 01:05:37,521 INFO L402 AbstractCegarLoop]: === Iteration 79 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:05:37,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:05:37,522 INFO L85 PathProgramCache]: Analyzing trace with hash -1175399473, now seen corresponding path program 77 times [2021-11-21 01:05:37,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:05:37,522 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971841884] [2021-11-21 01:05:37,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:05:37,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:05:37,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:05:39,633 INFO L134 CoverageAnalysis]: Checked inductivity of 3081 backedges. 2301 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:39,633 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:05:39,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971841884] [2021-11-21 01:05:39,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1971841884] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:05:39,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [307217595] [2021-11-21 01:05:39,633 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:05:39,634 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:39,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:05:39,634 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:05:39,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2021-11-21 01:05:39,834 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2021-11-21 01:05:39,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:05:39,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 82 conjunts are in the unsatisfiable core [2021-11-21 01:05:39,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:05:40,248 INFO L134 CoverageAnalysis]: Checked inductivity of 3081 backedges. 2301 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:40,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:05:40,632 INFO L134 CoverageAnalysis]: Checked inductivity of 3081 backedges. 2301 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:40,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [307217595] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:05:40,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [644430482] [2021-11-21 01:05:40,633 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:05:40,633 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:05:40,633 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:05:40,634 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:05:40,634 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:05:41,385 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:05:41,787 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:05:41,787 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:05:41,787 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 82 [2021-11-21 01:05:41,788 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726137642] [2021-11-21 01:05:41,788 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:05:41,788 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-21 01:05:41,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:05:41,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-21 01:05:41,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1779, Invalid=5877, Unknown=0, NotChecked=0, Total=7656 [2021-11-21 01:05:41,790 INFO L87 Difference]: Start difference. First operand 162 states and 163 transitions. Second operand has 83 states, 83 states have (on average 1.963855421686747) internal successors, (163), 82 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:43,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:05:43,514 INFO L93 Difference]: Finished difference Result 286 states and 288 transitions. [2021-11-21 01:05:43,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-11-21 01:05:43,515 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 1.963855421686747) internal successors, (163), 82 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 161 [2021-11-21 01:05:43,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:05:43,516 INFO L225 Difference]: With dead ends: 286 [2021-11-21 01:05:43,516 INFO L226 Difference]: Without dead ends: 163 [2021-11-21 01:05:43,517 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 602 GetRequests, 476 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2938 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=3499, Invalid=12757, Unknown=0, NotChecked=0, Total=16256 [2021-11-21 01:05:43,517 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 3 mSDsluCounter, 401 mSDsCounter, 0 mSdLazyCounter, 890 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 442 SdHoareTripleChecker+Invalid, 896 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 890 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:05:43,518 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 442 Invalid, 896 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 890 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:05:43,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-11-21 01:05:43,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 163. [2021-11-21 01:05:43,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 162 states have (on average 1.0123456790123457) internal successors, (164), 162 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:43,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 164 transitions. [2021-11-21 01:05:43,565 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 164 transitions. Word has length 161 [2021-11-21 01:05:43,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:05:43,565 INFO L470 AbstractCegarLoop]: Abstraction has 163 states and 164 transitions. [2021-11-21 01:05:43,565 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 1.963855421686747) internal successors, (163), 82 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:43,565 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 164 transitions. [2021-11-21 01:05:43,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2021-11-21 01:05:43,567 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:05:43,567 INFO L514 BasicCegarLoop]: trace histogram [40, 40, 39, 39, 1, 1, 1, 1] [2021-11-21 01:05:43,606 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Forceful destruction successful, exit code 0 [2021-11-21 01:05:43,793 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2021-11-21 01:05:43,793 INFO L402 AbstractCegarLoop]: === Iteration 80 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:05:43,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:05:43,794 INFO L85 PathProgramCache]: Analyzing trace with hash 1472581766, now seen corresponding path program 78 times [2021-11-21 01:05:43,794 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:05:43,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [148410279] [2021-11-21 01:05:43,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:05:43,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:05:43,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:05:44,696 INFO L134 CoverageAnalysis]: Checked inductivity of 3121 backedges. 780 proven. 2341 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:44,696 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:05:44,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [148410279] [2021-11-21 01:05:44,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [148410279] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:05:44,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1095801940] [2021-11-21 01:05:44,697 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:05:44,697 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:44,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:05:44,698 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:05:44,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2021-11-21 01:05:44,822 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:05:44,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:05:44,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 628 conjuncts, 83 conjunts are in the unsatisfiable core [2021-11-21 01:05:44,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:05:45,251 INFO L134 CoverageAnalysis]: Checked inductivity of 3121 backedges. 820 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:45,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:05:45,654 INFO L134 CoverageAnalysis]: Checked inductivity of 3121 backedges. 820 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:45,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1095801940] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:05:45,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1197265195] [2021-11-21 01:05:45,655 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:05:45,655 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:05:45,655 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:05:45,655 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:05:45,655 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:05:46,392 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:05:46,683 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:05:46,683 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:05:46,683 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 45 [2021-11-21 01:05:46,684 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982620239] [2021-11-21 01:05:46,684 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:05:46,684 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-21 01:05:46,684 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:05:46,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-21 01:05:46,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=932, Invalid=1618, Unknown=0, NotChecked=0, Total=2550 [2021-11-21 01:05:46,686 INFO L87 Difference]: Start difference. First operand 163 states and 164 transitions. Second operand has 46 states, 46 states have (on average 3.608695652173913) internal successors, (166), 45 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:47,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:05:47,687 INFO L93 Difference]: Finished difference Result 174 states and 175 transitions. [2021-11-21 01:05:47,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-11-21 01:05:47,688 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.608695652173913) internal successors, (166), 45 states have internal predecessors, (166), 0 states have call successors, (0), 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 162 [2021-11-21 01:05:47,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:05:47,689 INFO L225 Difference]: With dead ends: 174 [2021-11-21 01:05:47,689 INFO L226 Difference]: Without dead ends: 172 [2021-11-21 01:05:47,690 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 608 GetRequests, 515 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2210 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2825, Invalid=5731, Unknown=0, NotChecked=0, Total=8556 [2021-11-21 01:05:47,690 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 89 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 433 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 433 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:05:47,690 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 16 Invalid, 558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 433 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:05:47,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-11-21 01:05:47,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 166. [2021-11-21 01:05:47,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 165 states have (on average 1.0121212121212122) internal successors, (167), 165 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) [2021-11-21 01:05:47,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2021-11-21 01:05:47,718 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 162 [2021-11-21 01:05:47,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:05:47,718 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2021-11-21 01:05:47,719 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 3.608695652173913) internal successors, (166), 45 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:47,719 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2021-11-21 01:05:47,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2021-11-21 01:05:47,719 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:05:47,720 INFO L514 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 1, 1, 1, 1] [2021-11-21 01:05:47,746 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Ended with exit code 0 [2021-11-21 01:05:47,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable79 [2021-11-21 01:05:47,920 INFO L402 AbstractCegarLoop]: === Iteration 81 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:05:47,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:05:47,921 INFO L85 PathProgramCache]: Analyzing trace with hash 892249843, now seen corresponding path program 79 times [2021-11-21 01:05:47,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:05:47,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580671085] [2021-11-21 01:05:47,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:05:47,921 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:05:47,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:05:50,159 INFO L134 CoverageAnalysis]: Checked inductivity of 3240 backedges. 2420 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:50,160 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:05:50,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580671085] [2021-11-21 01:05:50,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1580671085] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:05:50,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [358399288] [2021-11-21 01:05:50,160 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:05:50,160 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:50,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:05:50,161 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:05:50,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2021-11-21 01:05:50,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:05:50,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 638 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-21 01:05:50,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:05:50,697 INFO L134 CoverageAnalysis]: Checked inductivity of 3240 backedges. 2420 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:50,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:05:51,074 INFO L134 CoverageAnalysis]: Checked inductivity of 3240 backedges. 2420 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:51,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [358399288] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:05:51,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [232911644] [2021-11-21 01:05:51,075 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:05:51,075 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:05:51,075 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:05:51,075 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:05:51,076 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:05:51,845 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:05:52,265 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:05:52,265 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:05:52,265 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 84 [2021-11-21 01:05:52,265 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167147439] [2021-11-21 01:05:52,266 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:05:52,266 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2021-11-21 01:05:52,266 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:05:52,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-11-21 01:05:52,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1864, Invalid=6146, Unknown=0, NotChecked=0, Total=8010 [2021-11-21 01:05:52,267 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand has 85 states, 85 states have (on average 1.964705882352941) internal successors, (167), 84 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) [2021-11-21 01:05:53,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:05:53,989 INFO L93 Difference]: Finished difference Result 293 states and 295 transitions. [2021-11-21 01:05:53,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-11-21 01:05:53,989 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 1.964705882352941) internal successors, (167), 84 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 165 [2021-11-21 01:05:53,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:05:53,990 INFO L225 Difference]: With dead ends: 293 [2021-11-21 01:05:53,990 INFO L226 Difference]: Without dead ends: 167 [2021-11-21 01:05:53,991 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 617 GetRequests, 488 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3073 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=3668, Invalid=13362, Unknown=0, NotChecked=0, Total=17030 [2021-11-21 01:05:53,991 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 3 mSDsluCounter, 359 mSDsCounter, 0 mSdLazyCounter, 815 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 401 SdHoareTripleChecker+Invalid, 822 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 815 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:05:53,992 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 401 Invalid, 822 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 815 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:05:53,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-21 01:05:54,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 167. [2021-11-21 01:05:54,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 166 states have (on average 1.0120481927710843) internal successors, (168), 166 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:54,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 168 transitions. [2021-11-21 01:05:54,020 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 168 transitions. Word has length 165 [2021-11-21 01:05:54,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:05:54,020 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 168 transitions. [2021-11-21 01:05:54,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 85 states have (on average 1.964705882352941) internal successors, (167), 84 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) [2021-11-21 01:05:54,020 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 168 transitions. [2021-11-21 01:05:54,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-11-21 01:05:54,021 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:05:54,021 INFO L514 BasicCegarLoop]: trace histogram [41, 41, 40, 40, 1, 1, 1, 1] [2021-11-21 01:05:54,048 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Forceful destruction successful, exit code 0 [2021-11-21 01:05:54,221 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:54,222 INFO L402 AbstractCegarLoop]: === Iteration 82 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:05:54,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:05:54,222 INFO L85 PathProgramCache]: Analyzing trace with hash -1304924118, now seen corresponding path program 80 times [2021-11-21 01:05:54,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:05:54,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853047829] [2021-11-21 01:05:54,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:05:54,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:05:54,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:05:55,161 INFO L134 CoverageAnalysis]: Checked inductivity of 3281 backedges. 820 proven. 2461 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:55,161 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:05:55,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853047829] [2021-11-21 01:05:55,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [853047829] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:05:55,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [322737821] [2021-11-21 01:05:55,161 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:05:55,162 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:55,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:05:55,162 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:05:55,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2021-11-21 01:05:55,370 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2021-11-21 01:05:55,370 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:05:55,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-21 01:05:55,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:05:55,779 INFO L134 CoverageAnalysis]: Checked inductivity of 3281 backedges. 861 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:55,779 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:05:56,178 INFO L134 CoverageAnalysis]: Checked inductivity of 3281 backedges. 861 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:05:56,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [322737821] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:05:56,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [514049497] [2021-11-21 01:05:56,179 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:05:56,179 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:05:56,179 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:05:56,179 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:05:56,179 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:05:56,905 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:05:57,196 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:05:57,196 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:05:57,196 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 46 [2021-11-21 01:05:57,196 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013554885] [2021-11-21 01:05:57,197 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:05:57,197 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-21 01:05:57,197 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:05:57,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-21 01:05:57,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=975, Invalid=1677, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 01:05:57,198 INFO L87 Difference]: Start difference. First operand 167 states and 168 transitions. Second operand has 47 states, 47 states have (on average 3.617021276595745) internal successors, (170), 46 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:58,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:05:58,249 INFO L93 Difference]: Finished difference Result 178 states and 179 transitions. [2021-11-21 01:05:58,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-11-21 01:05:58,249 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.617021276595745) internal successors, (170), 46 states have internal predecessors, (170), 0 states have call successors, (0), 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 166 [2021-11-21 01:05:58,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:05:58,250 INFO L225 Difference]: With dead ends: 178 [2021-11-21 01:05:58,250 INFO L226 Difference]: Without dead ends: 176 [2021-11-21 01:05:58,251 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 623 GetRequests, 528 SyntacticMatches, 2 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2306 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2956, Invalid=5974, Unknown=0, NotChecked=0, Total=8930 [2021-11-21 01:05:58,251 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 135 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:05:58,252 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 22 Invalid, 608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 440 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:05:58,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2021-11-21 01:05:58,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 170. [2021-11-21 01:05:58,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 169 states have (on average 1.0118343195266273) internal successors, (171), 169 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:58,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 171 transitions. [2021-11-21 01:05:58,285 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 171 transitions. Word has length 166 [2021-11-21 01:05:58,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:05:58,286 INFO L470 AbstractCegarLoop]: Abstraction has 170 states and 171 transitions. [2021-11-21 01:05:58,286 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 3.617021276595745) internal successors, (170), 46 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:05:58,286 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 171 transitions. [2021-11-21 01:05:58,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-11-21 01:05:58,287 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:05:58,287 INFO L514 BasicCegarLoop]: trace histogram [42, 41, 41, 41, 1, 1, 1, 1] [2021-11-21 01:05:58,314 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Ended with exit code 0 [2021-11-21 01:05:58,489 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:05:58,489 INFO L402 AbstractCegarLoop]: === Iteration 83 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:05:58,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:05:58,490 INFO L85 PathProgramCache]: Analyzing trace with hash -1240582961, now seen corresponding path program 81 times [2021-11-21 01:05:58,490 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:05:58,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [68013228] [2021-11-21 01:05:58,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:05:58,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:05:58,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:00,823 INFO L134 CoverageAnalysis]: Checked inductivity of 3403 backedges. 2542 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:00,823 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:00,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [68013228] [2021-11-21 01:06:00,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [68013228] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:00,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1581231404] [2021-11-21 01:06:00,823 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:06:00,823 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:00,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:00,824 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:00,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2021-11-21 01:06:00,949 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:06:00,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:06:00,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 653 conjuncts, 86 conjunts are in the unsatisfiable core [2021-11-21 01:06:00,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:01,364 INFO L134 CoverageAnalysis]: Checked inductivity of 3403 backedges. 2542 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:01,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:06:01,750 INFO L134 CoverageAnalysis]: Checked inductivity of 3403 backedges. 2542 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:01,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1581231404] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:06:01,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1632493197] [2021-11-21 01:06:01,751 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:06:01,751 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:06:01,751 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:06:01,752 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:06:01,752 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:06:02,585 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:06:02,993 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:06:02,993 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:06:02,993 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 86 [2021-11-21 01:06:02,993 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641249582] [2021-11-21 01:06:02,994 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:06:02,994 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-21 01:06:02,994 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:02,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-21 01:06:02,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2021-11-21 01:06:02,995 INFO L87 Difference]: Start difference. First operand 170 states and 171 transitions. Second operand has 87 states, 87 states have (on average 1.9655172413793103) internal successors, (171), 86 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:04,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:04,842 INFO L93 Difference]: Finished difference Result 300 states and 302 transitions. [2021-11-21 01:06:04,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-11-21 01:06:04,843 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 1.9655172413793103) internal successors, (171), 86 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 169 [2021-11-21 01:06:04,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:04,844 INFO L225 Difference]: With dead ends: 300 [2021-11-21 01:06:04,844 INFO L226 Difference]: Without dead ends: 171 [2021-11-21 01:06:04,845 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3211 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=3841, Invalid=13981, Unknown=0, NotChecked=0, Total=17822 [2021-11-21 01:06:04,845 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 3 mSDsluCounter, 423 mSDsCounter, 0 mSdLazyCounter, 936 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 466 SdHoareTripleChecker+Invalid, 942 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 936 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:04,846 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 466 Invalid, 942 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 936 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:06:04,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-11-21 01:06:04,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 171. [2021-11-21 01:06:04,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 170 states have (on average 1.011764705882353) internal successors, (172), 170 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:04,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 172 transitions. [2021-11-21 01:06:04,893 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 172 transitions. Word has length 169 [2021-11-21 01:06:04,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:04,894 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 172 transitions. [2021-11-21 01:06:04,894 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 1.9655172413793103) internal successors, (171), 86 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:04,894 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 172 transitions. [2021-11-21 01:06:04,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-21 01:06:04,896 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:04,896 INFO L514 BasicCegarLoop]: trace histogram [42, 42, 41, 41, 1, 1, 1, 1] [2021-11-21 01:06:04,941 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:05,113 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:05,113 INFO L402 AbstractCegarLoop]: === Iteration 84 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:05,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:05,114 INFO L85 PathProgramCache]: Analyzing trace with hash -1710060922, now seen corresponding path program 82 times [2021-11-21 01:06:05,114 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:05,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139934024] [2021-11-21 01:06:05,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:05,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:05,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:06,094 INFO L134 CoverageAnalysis]: Checked inductivity of 3445 backedges. 861 proven. 2584 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:06,094 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:06,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139934024] [2021-11-21 01:06:06,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1139934024] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:06,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [236722380] [2021-11-21 01:06:06,095 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:06:06,095 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:06,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:06,096 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:06,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2021-11-21 01:06:06,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:06,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 87 conjunts are in the unsatisfiable core [2021-11-21 01:06:06,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:06,647 INFO L134 CoverageAnalysis]: Checked inductivity of 3445 backedges. 903 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:06,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:06:07,085 INFO L134 CoverageAnalysis]: Checked inductivity of 3445 backedges. 903 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:07,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [236722380] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:06:07,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [924843825] [2021-11-21 01:06:07,086 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:06:07,086 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:06:07,086 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:06:07,086 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:06:07,087 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:06:07,836 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:06:08,135 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:06:08,136 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:06:08,136 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 47 [2021-11-21 01:06:08,136 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27166585] [2021-11-21 01:06:08,136 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:06:08,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-21 01:06:08,137 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:08,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-21 01:06:08,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1019, Invalid=1737, Unknown=0, NotChecked=0, Total=2756 [2021-11-21 01:06:08,137 INFO L87 Difference]: Start difference. First operand 171 states and 172 transitions. Second operand has 48 states, 48 states have (on average 3.625) internal successors, (174), 47 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:09,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:09,204 INFO L93 Difference]: Finished difference Result 182 states and 183 transitions. [2021-11-21 01:06:09,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-11-21 01:06:09,205 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.625) internal successors, (174), 47 states have internal predecessors, (174), 0 states have call successors, (0), 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 170 [2021-11-21 01:06:09,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:09,206 INFO L225 Difference]: With dead ends: 182 [2021-11-21 01:06:09,206 INFO L226 Difference]: Without dead ends: 180 [2021-11-21 01:06:09,207 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 638 GetRequests, 541 SyntacticMatches, 2 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2404 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=3090, Invalid=6222, Unknown=0, NotChecked=0, Total=9312 [2021-11-21 01:06:09,207 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 90 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 441 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 572 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 441 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:09,207 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 18 Invalid, 572 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 441 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:06:09,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-11-21 01:06:09,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 174. [2021-11-21 01:06:09,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 173 states have (on average 1.0115606936416186) internal successors, (175), 173 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:09,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 175 transitions. [2021-11-21 01:06:09,255 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 175 transitions. Word has length 170 [2021-11-21 01:06:09,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:09,255 INFO L470 AbstractCegarLoop]: Abstraction has 174 states and 175 transitions. [2021-11-21 01:06:09,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 3.625) internal successors, (174), 47 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:09,255 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 175 transitions. [2021-11-21 01:06:09,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-11-21 01:06:09,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:09,257 INFO L514 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 1, 1, 1, 1] [2021-11-21 01:06:09,291 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:09,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable83 [2021-11-21 01:06:09,469 INFO L402 AbstractCegarLoop]: === Iteration 85 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:09,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:09,470 INFO L85 PathProgramCache]: Analyzing trace with hash -1813009165, now seen corresponding path program 83 times [2021-11-21 01:06:09,470 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:09,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129907482] [2021-11-21 01:06:09,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:09,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:09,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:11,838 INFO L134 CoverageAnalysis]: Checked inductivity of 3570 backedges. 2667 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:11,838 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:11,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129907482] [2021-11-21 01:06:11,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [129907482] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:11,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2140113728] [2021-11-21 01:06:11,839 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:06:11,839 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:11,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:11,841 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:11,842 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-21 01:06:12,066 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2021-11-21 01:06:12,066 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:06:12,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 668 conjuncts, 88 conjunts are in the unsatisfiable core [2021-11-21 01:06:12,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:12,501 INFO L134 CoverageAnalysis]: Checked inductivity of 3570 backedges. 2667 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:12,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:06:12,900 INFO L134 CoverageAnalysis]: Checked inductivity of 3570 backedges. 2667 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:12,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2140113728] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:06:12,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1235151172] [2021-11-21 01:06:12,901 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:06:12,901 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:06:12,901 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:06:12,901 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:06:12,901 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:06:13,705 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:06:14,144 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:06:14,144 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:06:14,145 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 88 [2021-11-21 01:06:14,145 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044053149] [2021-11-21 01:06:14,145 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:06:14,145 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2021-11-21 01:06:14,145 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:14,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-11-21 01:06:14,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2040, Invalid=6702, Unknown=0, NotChecked=0, Total=8742 [2021-11-21 01:06:14,147 INFO L87 Difference]: Start difference. First operand 174 states and 175 transitions. Second operand has 89 states, 89 states have (on average 1.9662921348314606) internal successors, (175), 88 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:16,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:16,063 INFO L93 Difference]: Finished difference Result 307 states and 309 transitions. [2021-11-21 01:06:16,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-11-21 01:06:16,063 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 1.9662921348314606) internal successors, (175), 88 states have internal predecessors, (175), 0 states have call successors, (0), 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 173 [2021-11-21 01:06:16,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:16,065 INFO L225 Difference]: With dead ends: 307 [2021-11-21 01:06:16,065 INFO L226 Difference]: Without dead ends: 175 [2021-11-21 01:06:16,066 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 647 GetRequests, 512 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3352 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=4018, Invalid=14614, Unknown=0, NotChecked=0, Total=18632 [2021-11-21 01:06:16,066 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 3 mSDsluCounter, 396 mSDsCounter, 0 mSdLazyCounter, 890 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 440 SdHoareTripleChecker+Invalid, 897 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 890 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:16,066 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 440 Invalid, 897 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 890 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:06:16,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-11-21 01:06:16,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2021-11-21 01:06:16,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 174 states have (on average 1.0114942528735633) internal successors, (176), 174 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:16,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 176 transitions. [2021-11-21 01:06:16,116 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 176 transitions. Word has length 173 [2021-11-21 01:06:16,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:16,116 INFO L470 AbstractCegarLoop]: Abstraction has 175 states and 176 transitions. [2021-11-21 01:06:16,116 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 1.9662921348314606) internal successors, (175), 88 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:16,116 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 176 transitions. [2021-11-21 01:06:16,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-21 01:06:16,118 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:16,118 INFO L514 BasicCegarLoop]: trace histogram [43, 43, 42, 42, 1, 1, 1, 1] [2021-11-21 01:06:16,162 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:16,345 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:16,345 INFO L402 AbstractCegarLoop]: === Iteration 86 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:16,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:16,346 INFO L85 PathProgramCache]: Analyzing trace with hash -1915465942, now seen corresponding path program 84 times [2021-11-21 01:06:16,346 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:16,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611370342] [2021-11-21 01:06:16,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:16,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:16,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:17,393 INFO L134 CoverageAnalysis]: Checked inductivity of 3613 backedges. 903 proven. 2710 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:17,393 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:17,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611370342] [2021-11-21 01:06:17,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1611370342] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:17,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [804047414] [2021-11-21 01:06:17,394 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:06:17,394 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:17,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:17,395 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:17,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2021-11-21 01:06:17,531 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:06:17,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:06:17,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 673 conjuncts, 89 conjunts are in the unsatisfiable core [2021-11-21 01:06:17,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:17,992 INFO L134 CoverageAnalysis]: Checked inductivity of 3613 backedges. 946 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:17,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:06:18,425 INFO L134 CoverageAnalysis]: Checked inductivity of 3613 backedges. 946 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:18,425 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [804047414] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:06:18,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1160524377] [2021-11-21 01:06:18,426 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:06:18,426 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:06:18,427 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:06:18,427 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:06:18,427 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:06:19,175 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:06:19,476 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:06:19,476 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:06:19,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 48 [2021-11-21 01:06:19,477 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123825626] [2021-11-21 01:06:19,477 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:06:19,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-21 01:06:19,478 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:19,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-21 01:06:19,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1064, Invalid=1798, Unknown=0, NotChecked=0, Total=2862 [2021-11-21 01:06:19,479 INFO L87 Difference]: Start difference. First operand 175 states and 176 transitions. Second operand has 49 states, 49 states have (on average 3.63265306122449) internal successors, (178), 48 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:20,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:20,602 INFO L93 Difference]: Finished difference Result 186 states and 187 transitions. [2021-11-21 01:06:20,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2021-11-21 01:06:20,602 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.63265306122449) internal successors, (178), 48 states have internal predecessors, (178), 0 states have call successors, (0), 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 174 [2021-11-21 01:06:20,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:20,603 INFO L225 Difference]: With dead ends: 186 [2021-11-21 01:06:20,603 INFO L226 Difference]: Without dead ends: 184 [2021-11-21 01:06:20,604 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 653 GetRequests, 554 SyntacticMatches, 2 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2504 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=3227, Invalid=6475, Unknown=0, NotChecked=0, Total=9702 [2021-11-21 01:06:20,604 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 137 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 425 mSolverCounterSat, 177 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 602 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 177 IncrementalHoareTripleChecker+Valid, 425 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:20,605 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 15 Invalid, 602 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [177 Valid, 425 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:06:20,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-11-21 01:06:20,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 178. [2021-11-21 01:06:20,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 177 states have (on average 1.0112994350282485) internal successors, (179), 177 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) [2021-11-21 01:06:20,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 179 transitions. [2021-11-21 01:06:20,637 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 179 transitions. Word has length 174 [2021-11-21 01:06:20,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:20,638 INFO L470 AbstractCegarLoop]: Abstraction has 178 states and 179 transitions. [2021-11-21 01:06:20,638 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 3.63265306122449) internal successors, (178), 48 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:20,638 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 179 transitions. [2021-11-21 01:06:20,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2021-11-21 01:06:20,639 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:20,639 INFO L514 BasicCegarLoop]: trace histogram [44, 43, 43, 43, 1, 1, 1, 1] [2021-11-21 01:06:20,666 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:20,839 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:20,840 INFO L402 AbstractCegarLoop]: === Iteration 87 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:20,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:20,840 INFO L85 PathProgramCache]: Analyzing trace with hash -705563185, now seen corresponding path program 85 times [2021-11-21 01:06:20,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:20,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1102253398] [2021-11-21 01:06:20,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:20,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:20,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:23,360 INFO L134 CoverageAnalysis]: Checked inductivity of 3741 backedges. 2795 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:23,361 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:23,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1102253398] [2021-11-21 01:06:23,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1102253398] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:23,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714474614] [2021-11-21 01:06:23,361 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:06:23,362 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:23,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:23,370 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:23,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2021-11-21 01:06:23,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:23,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 683 conjuncts, 90 conjunts are in the unsatisfiable core [2021-11-21 01:06:23,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:23,927 INFO L134 CoverageAnalysis]: Checked inductivity of 3741 backedges. 2795 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:23,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:06:24,352 INFO L134 CoverageAnalysis]: Checked inductivity of 3741 backedges. 2795 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:24,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1714474614] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:06:24,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [98829983] [2021-11-21 01:06:24,354 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:06:24,354 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:06:24,354 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:06:24,354 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:06:24,355 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:06:25,092 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:06:25,520 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:06:25,521 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:06:25,521 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 90 [2021-11-21 01:06:25,521 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074904543] [2021-11-21 01:06:25,521 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:06:25,522 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2021-11-21 01:06:25,522 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:25,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-11-21 01:06:25,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2131, Invalid=6989, Unknown=0, NotChecked=0, Total=9120 [2021-11-21 01:06:25,523 INFO L87 Difference]: Start difference. First operand 178 states and 179 transitions. Second operand has 91 states, 91 states have (on average 1.967032967032967) internal successors, (179), 90 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) [2021-11-21 01:06:27,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:27,486 INFO L93 Difference]: Finished difference Result 314 states and 316 transitions. [2021-11-21 01:06:27,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-11-21 01:06:27,486 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 1.967032967032967) internal successors, (179), 90 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 177 [2021-11-21 01:06:27,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:27,487 INFO L225 Difference]: With dead ends: 314 [2021-11-21 01:06:27,488 INFO L226 Difference]: Without dead ends: 179 [2021-11-21 01:06:27,489 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 662 GetRequests, 524 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3496 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=4199, Invalid=15261, Unknown=0, NotChecked=0, Total=19460 [2021-11-21 01:06:27,489 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 3 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 663 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 320 SdHoareTripleChecker+Invalid, 670 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 663 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:27,489 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 320 Invalid, 670 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 663 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:06:27,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-11-21 01:06:27,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2021-11-21 01:06:27,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 178 states have (on average 1.0112359550561798) internal successors, (180), 178 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:27,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 180 transitions. [2021-11-21 01:06:27,522 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 180 transitions. Word has length 177 [2021-11-21 01:06:27,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:27,522 INFO L470 AbstractCegarLoop]: Abstraction has 179 states and 180 transitions. [2021-11-21 01:06:27,523 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 1.967032967032967) internal successors, (179), 90 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) [2021-11-21 01:06:27,523 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 180 transitions. [2021-11-21 01:06:27,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-21 01:06:27,524 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:27,524 INFO L514 BasicCegarLoop]: trace histogram [44, 44, 43, 43, 1, 1, 1, 1] [2021-11-21 01:06:27,554 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Ended with exit code 0 [2021-11-21 01:06:27,724 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:27,724 INFO L402 AbstractCegarLoop]: === Iteration 88 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:27,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:27,725 INFO L85 PathProgramCache]: Analyzing trace with hash 733783174, now seen corresponding path program 86 times [2021-11-21 01:06:27,725 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:27,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1363365288] [2021-11-21 01:06:27,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:27,725 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:27,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:28,784 INFO L134 CoverageAnalysis]: Checked inductivity of 3785 backedges. 946 proven. 2839 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:28,784 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:28,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1363365288] [2021-11-21 01:06:28,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1363365288] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:28,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [751254147] [2021-11-21 01:06:28,784 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:06:28,785 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:28,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:28,785 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:28,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-21 01:06:29,021 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 44 check-sat command(s) [2021-11-21 01:06:29,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:06:29,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 688 conjuncts, 91 conjunts are in the unsatisfiable core [2021-11-21 01:06:29,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:29,473 INFO L134 CoverageAnalysis]: Checked inductivity of 3785 backedges. 990 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:29,473 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:06:29,867 INFO L134 CoverageAnalysis]: Checked inductivity of 3785 backedges. 990 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:29,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [751254147] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:06:29,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1442091731] [2021-11-21 01:06:29,868 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:06:29,868 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:06:29,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:06:29,869 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:06:29,869 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:06:30,604 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:06:30,904 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:06:30,904 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:06:30,904 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 49 [2021-11-21 01:06:30,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733520438] [2021-11-21 01:06:30,904 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:06:30,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-21 01:06:30,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:30,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-21 01:06:30,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1110, Invalid=1860, Unknown=0, NotChecked=0, Total=2970 [2021-11-21 01:06:30,906 INFO L87 Difference]: Start difference. First operand 179 states and 180 transitions. Second operand has 50 states, 50 states have (on average 3.64) internal successors, (182), 49 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:32,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:32,041 INFO L93 Difference]: Finished difference Result 190 states and 191 transitions. [2021-11-21 01:06:32,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2021-11-21 01:06:32,042 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.64) internal successors, (182), 49 states have internal predecessors, (182), 0 states have call successors, (0), 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 178 [2021-11-21 01:06:32,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:32,043 INFO L225 Difference]: With dead ends: 190 [2021-11-21 01:06:32,043 INFO L226 Difference]: Without dead ends: 188 [2021-11-21 01:06:32,044 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 668 GetRequests, 567 SyntacticMatches, 2 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2606 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=3367, Invalid=6733, Unknown=0, NotChecked=0, Total=10100 [2021-11-21 01:06:32,044 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 144 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 486 mSolverCounterSat, 180 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 666 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 180 IncrementalHoareTripleChecker+Valid, 486 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:32,045 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [144 Valid, 22 Invalid, 666 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [180 Valid, 486 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:06:32,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-11-21 01:06:32,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 182. [2021-11-21 01:06:32,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 181 states have (on average 1.011049723756906) internal successors, (183), 181 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:32,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 183 transitions. [2021-11-21 01:06:32,088 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 183 transitions. Word has length 178 [2021-11-21 01:06:32,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:32,089 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 183 transitions. [2021-11-21 01:06:32,089 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 3.64) internal successors, (182), 49 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:32,089 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 183 transitions. [2021-11-21 01:06:32,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-11-21 01:06:32,090 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:32,090 INFO L514 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 1, 1, 1, 1] [2021-11-21 01:06:32,117 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:32,290 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:32,290 INFO L402 AbstractCegarLoop]: === Iteration 89 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:32,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:32,291 INFO L85 PathProgramCache]: Analyzing trace with hash -1244179725, now seen corresponding path program 87 times [2021-11-21 01:06:32,291 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:32,291 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897537135] [2021-11-21 01:06:32,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:32,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:32,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:34,934 INFO L134 CoverageAnalysis]: Checked inductivity of 3916 backedges. 2926 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:34,934 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:34,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897537135] [2021-11-21 01:06:34,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [897537135] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:34,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726258929] [2021-11-21 01:06:34,935 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:06:34,935 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:34,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:34,936 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:34,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2021-11-21 01:06:35,077 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:06:35,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:06:35,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 698 conjuncts, 92 conjunts are in the unsatisfiable core [2021-11-21 01:06:35,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:35,524 INFO L134 CoverageAnalysis]: Checked inductivity of 3916 backedges. 2926 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:35,524 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:06:35,960 INFO L134 CoverageAnalysis]: Checked inductivity of 3916 backedges. 2926 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:35,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [726258929] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:06:35,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [634260927] [2021-11-21 01:06:35,961 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:06:35,961 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:06:35,962 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:06:35,962 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:06:35,962 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:06:36,702 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:06:37,136 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:06:37,136 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:06:37,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 92 [2021-11-21 01:06:37,137 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870188600] [2021-11-21 01:06:37,137 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:06:37,137 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2021-11-21 01:06:37,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:37,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2021-11-21 01:06:37,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2224, Invalid=7282, Unknown=0, NotChecked=0, Total=9506 [2021-11-21 01:06:37,139 INFO L87 Difference]: Start difference. First operand 182 states and 183 transitions. Second operand has 93 states, 93 states have (on average 1.967741935483871) internal successors, (183), 92 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:39,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:39,131 INFO L93 Difference]: Finished difference Result 321 states and 323 transitions. [2021-11-21 01:06:39,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-11-21 01:06:39,131 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 1.967741935483871) internal successors, (183), 92 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 181 [2021-11-21 01:06:39,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:39,132 INFO L225 Difference]: With dead ends: 321 [2021-11-21 01:06:39,133 INFO L226 Difference]: Without dead ends: 183 [2021-11-21 01:06:39,139 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 677 GetRequests, 536 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3643 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=4384, Invalid=15922, Unknown=0, NotChecked=0, Total=20306 [2021-11-21 01:06:39,139 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 3 mSDsluCounter, 354 mSDsCounter, 0 mSdLazyCounter, 819 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 400 SdHoareTripleChecker+Invalid, 823 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 819 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:39,140 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 400 Invalid, 823 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 819 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:06:39,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-11-21 01:06:39,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 183. [2021-11-21 01:06:39,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 182 states have (on average 1.010989010989011) internal successors, (184), 182 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:39,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 184 transitions. [2021-11-21 01:06:39,194 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 184 transitions. Word has length 181 [2021-11-21 01:06:39,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:39,194 INFO L470 AbstractCegarLoop]: Abstraction has 183 states and 184 transitions. [2021-11-21 01:06:39,194 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 1.967741935483871) internal successors, (183), 92 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:39,195 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 184 transitions. [2021-11-21 01:06:39,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-11-21 01:06:39,196 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:39,196 INFO L514 BasicCegarLoop]: trace histogram [45, 45, 44, 44, 1, 1, 1, 1] [2021-11-21 01:06:39,237 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:39,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable88 [2021-11-21 01:06:39,410 INFO L402 AbstractCegarLoop]: === Iteration 90 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:39,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:39,411 INFO L85 PathProgramCache]: Analyzing trace with hash -1263677910, now seen corresponding path program 88 times [2021-11-21 01:06:39,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:39,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2003704034] [2021-11-21 01:06:39,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:39,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:39,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:40,602 INFO L134 CoverageAnalysis]: Checked inductivity of 3961 backedges. 990 proven. 2971 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:40,602 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:40,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2003704034] [2021-11-21 01:06:40,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2003704034] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:40,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1756880689] [2021-11-21 01:06:40,603 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:06:40,603 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:40,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:40,604 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:40,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2021-11-21 01:06:40,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:40,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 703 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-21 01:06:40,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:41,186 INFO L134 CoverageAnalysis]: Checked inductivity of 3961 backedges. 1035 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:41,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:06:41,646 INFO L134 CoverageAnalysis]: Checked inductivity of 3961 backedges. 1035 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:41,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1756880689] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:06:41,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1313141356] [2021-11-21 01:06:41,647 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:06:41,647 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:06:41,647 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:06:41,647 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:06:41,647 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:06:42,381 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:06:42,679 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:06:42,679 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:06:42,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 50 [2021-11-21 01:06:42,680 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899156127] [2021-11-21 01:06:42,680 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:06:42,680 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-21 01:06:42,680 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:42,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-21 01:06:42,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1157, Invalid=1923, Unknown=0, NotChecked=0, Total=3080 [2021-11-21 01:06:42,681 INFO L87 Difference]: Start difference. First operand 183 states and 184 transitions. Second operand has 51 states, 51 states have (on average 3.6470588235294117) internal successors, (186), 50 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:43,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:43,858 INFO L93 Difference]: Finished difference Result 194 states and 195 transitions. [2021-11-21 01:06:43,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-11-21 01:06:43,858 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 3.6470588235294117) internal successors, (186), 50 states have internal predecessors, (186), 0 states have call successors, (0), 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 182 [2021-11-21 01:06:43,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:43,859 INFO L225 Difference]: With dead ends: 194 [2021-11-21 01:06:43,859 INFO L226 Difference]: Without dead ends: 192 [2021-11-21 01:06:43,860 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 683 GetRequests, 580 SyntacticMatches, 2 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2710 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=3510, Invalid=6996, Unknown=0, NotChecked=0, Total=10506 [2021-11-21 01:06:43,860 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 145 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 429 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 614 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:43,860 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 15 Invalid, 614 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 429 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:06:43,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-11-21 01:06:43,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 186. [2021-11-21 01:06:43,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 185 states have (on average 1.0108108108108107) internal successors, (187), 185 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:43,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 187 transitions. [2021-11-21 01:06:43,910 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 187 transitions. Word has length 182 [2021-11-21 01:06:43,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:43,911 INFO L470 AbstractCegarLoop]: Abstraction has 186 states and 187 transitions. [2021-11-21 01:06:43,911 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 3.6470588235294117) internal successors, (186), 50 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:43,911 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 187 transitions. [2021-11-21 01:06:43,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2021-11-21 01:06:43,913 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:43,913 INFO L514 BasicCegarLoop]: trace histogram [46, 45, 45, 45, 1, 1, 1, 1] [2021-11-21 01:06:43,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:44,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable89 [2021-11-21 01:06:44,141 INFO L402 AbstractCegarLoop]: === Iteration 91 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:44,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:44,142 INFO L85 PathProgramCache]: Analyzing trace with hash -835447089, now seen corresponding path program 89 times [2021-11-21 01:06:44,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:44,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078575994] [2021-11-21 01:06:44,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:44,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:44,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:46,706 INFO L134 CoverageAnalysis]: Checked inductivity of 4095 backedges. 3060 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:46,706 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:46,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078575994] [2021-11-21 01:06:46,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2078575994] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:46,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [144521996] [2021-11-21 01:06:46,707 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:06:46,707 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:46,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:46,708 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:46,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2021-11-21 01:06:46,933 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2021-11-21 01:06:46,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:06:46,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 713 conjuncts, 94 conjunts are in the unsatisfiable core [2021-11-21 01:06:46,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:47,365 INFO L134 CoverageAnalysis]: Checked inductivity of 4095 backedges. 3060 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:47,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:06:47,749 INFO L134 CoverageAnalysis]: Checked inductivity of 4095 backedges. 3060 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:47,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [144521996] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:06:47,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1795714151] [2021-11-21 01:06:47,750 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:06:47,750 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:06:47,750 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:06:47,750 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:06:47,750 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:06:48,439 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:06:48,874 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:06:48,874 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:06:48,874 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 94 [2021-11-21 01:06:48,875 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107535477] [2021-11-21 01:06:48,875 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:06:48,875 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2021-11-21 01:06:48,875 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:48,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2021-11-21 01:06:48,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2319, Invalid=7581, Unknown=0, NotChecked=0, Total=9900 [2021-11-21 01:06:48,876 INFO L87 Difference]: Start difference. First operand 186 states and 187 transitions. Second operand has 95 states, 95 states have (on average 1.9684210526315788) internal successors, (187), 94 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:50,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:50,954 INFO L93 Difference]: Finished difference Result 328 states and 330 transitions. [2021-11-21 01:06:50,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-11-21 01:06:50,955 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 1.9684210526315788) internal successors, (187), 94 states have internal predecessors, (187), 0 states have call successors, (0), 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 185 [2021-11-21 01:06:50,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:50,956 INFO L225 Difference]: With dead ends: 328 [2021-11-21 01:06:50,956 INFO L226 Difference]: Without dead ends: 187 [2021-11-21 01:06:50,957 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 692 GetRequests, 548 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3793 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=4573, Invalid=16597, Unknown=0, NotChecked=0, Total=21170 [2021-11-21 01:06:50,957 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 3 mSDsluCounter, 516 mSDsCounter, 0 mSdLazyCounter, 1131 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 563 SdHoareTripleChecker+Invalid, 1138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:50,957 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 563 Invalid, 1138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1131 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:06:50,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-11-21 01:06:50,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2021-11-21 01:06:50,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 186 states have (on average 1.010752688172043) internal successors, (188), 186 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) [2021-11-21 01:06:50,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2021-11-21 01:06:50,988 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 185 [2021-11-21 01:06:50,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:50,988 INFO L470 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2021-11-21 01:06:50,988 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 95 states, 95 states have (on average 1.9684210526315788) internal successors, (187), 94 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:50,988 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2021-11-21 01:06:50,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2021-11-21 01:06:50,989 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:50,990 INFO L514 BasicCegarLoop]: trace histogram [46, 46, 45, 45, 1, 1, 1, 1] [2021-11-21 01:06:51,030 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Ended with exit code 0 [2021-11-21 01:06:51,209 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:51,209 INFO L402 AbstractCegarLoop]: === Iteration 92 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:51,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:51,210 INFO L85 PathProgramCache]: Analyzing trace with hash 979115654, now seen corresponding path program 90 times [2021-11-21 01:06:51,210 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:51,210 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1912534824] [2021-11-21 01:06:51,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:51,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:51,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:52,638 INFO L134 CoverageAnalysis]: Checked inductivity of 4141 backedges. 1035 proven. 3106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:52,639 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:52,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1912534824] [2021-11-21 01:06:52,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1912534824] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:52,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1458141878] [2021-11-21 01:06:52,639 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:06:52,639 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:52,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:52,642 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:52,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Waiting until timeout for monitored process [2021-11-21 01:06:52,823 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:06:52,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:06:52,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 95 conjunts are in the unsatisfiable core [2021-11-21 01:06:52,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:53,328 INFO L134 CoverageAnalysis]: Checked inductivity of 4141 backedges. 1081 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:53,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:06:53,758 INFO L134 CoverageAnalysis]: Checked inductivity of 4141 backedges. 1081 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:53,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1458141878] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:06:53,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [895769568] [2021-11-21 01:06:53,759 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:06:53,759 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:06:53,760 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:06:53,760 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:06:53,760 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:06:54,468 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:06:54,760 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:06:54,760 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:06:54,760 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 51 [2021-11-21 01:06:54,760 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182554926] [2021-11-21 01:06:54,760 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:06:54,761 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-21 01:06:54,761 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:54,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-21 01:06:54,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1205, Invalid=1987, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 01:06:54,762 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand has 52 states, 52 states have (on average 3.6538461538461537) internal successors, (190), 51 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:55,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:55,974 INFO L93 Difference]: Finished difference Result 198 states and 199 transitions. [2021-11-21 01:06:55,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2021-11-21 01:06:55,975 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 3.6538461538461537) internal successors, (190), 51 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 186 [2021-11-21 01:06:55,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:55,976 INFO L225 Difference]: With dead ends: 198 [2021-11-21 01:06:55,976 INFO L226 Difference]: Without dead ends: 196 [2021-11-21 01:06:55,977 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 593 SyntacticMatches, 2 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2816 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=3656, Invalid=7264, Unknown=0, NotChecked=0, Total=10920 [2021-11-21 01:06:55,977 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 102 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 484 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 627 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 484 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:55,978 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 16 Invalid, 627 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 484 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:06:55,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-21 01:06:56,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 190. [2021-11-21 01:06:56,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 189 states have (on average 1.0105820105820107) internal successors, (191), 189 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) [2021-11-21 01:06:56,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2021-11-21 01:06:56,018 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 186 [2021-11-21 01:06:56,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:56,018 INFO L470 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2021-11-21 01:06:56,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 3.6538461538461537) internal successors, (190), 51 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:06:56,019 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2021-11-21 01:06:56,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2021-11-21 01:06:56,020 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:56,020 INFO L514 BasicCegarLoop]: trace histogram [47, 46, 46, 46, 1, 1, 1, 1] [2021-11-21 01:06:56,066 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:56,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:56,244 INFO L402 AbstractCegarLoop]: === Iteration 93 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:56,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:56,245 INFO L85 PathProgramCache]: Analyzing trace with hash 1716361459, now seen corresponding path program 91 times [2021-11-21 01:06:56,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:56,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716549980] [2021-11-21 01:06:56,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:56,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:56,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:59,123 INFO L134 CoverageAnalysis]: Checked inductivity of 4278 backedges. 3197 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:59,123 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:59,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1716549980] [2021-11-21 01:06:59,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1716549980] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:59,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1858999981] [2021-11-21 01:06:59,124 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:06:59,124 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:59,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:59,124 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:59,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Waiting until timeout for monitored process [2021-11-21 01:06:59,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:59,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 728 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-21 01:06:59,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:59,713 INFO L134 CoverageAnalysis]: Checked inductivity of 4278 backedges. 3197 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:59,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:07:00,152 INFO L134 CoverageAnalysis]: Checked inductivity of 4278 backedges. 3197 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:00,153 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1858999981] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:07:00,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1445120315] [2021-11-21 01:07:00,154 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:07:00,154 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:07:00,154 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:07:00,154 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:07:00,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:07:00,899 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:07:01,352 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:07:01,352 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:07:01,352 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 96 [2021-11-21 01:07:01,352 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959539879] [2021-11-21 01:07:01,352 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:07:01,353 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-21 01:07:01,353 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:07:01,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-21 01:07:01,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2416, Invalid=7886, Unknown=0, NotChecked=0, Total=10302 [2021-11-21 01:07:01,354 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand has 97 states, 97 states have (on average 1.9690721649484537) internal successors, (191), 96 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) [2021-11-21 01:07:03,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:07:03,524 INFO L93 Difference]: Finished difference Result 335 states and 337 transitions. [2021-11-21 01:07:03,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-21 01:07:03,524 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.9690721649484537) internal successors, (191), 96 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 189 [2021-11-21 01:07:03,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:07:03,525 INFO L225 Difference]: With dead ends: 335 [2021-11-21 01:07:03,525 INFO L226 Difference]: Without dead ends: 191 [2021-11-21 01:07:03,539 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 707 GetRequests, 560 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3946 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=4766, Invalid=17286, Unknown=0, NotChecked=0, Total=22052 [2021-11-21 01:07:03,540 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 3 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 774 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 378 SdHoareTripleChecker+Invalid, 782 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 774 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:07:03,540 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 378 Invalid, 782 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 774 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:07:03,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-21 01:07:03,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 191. [2021-11-21 01:07:03,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 190 states have (on average 1.0105263157894737) internal successors, (192), 190 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:03,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 192 transitions. [2021-11-21 01:07:03,578 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 192 transitions. Word has length 189 [2021-11-21 01:07:03,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:07:03,578 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 192 transitions. [2021-11-21 01:07:03,578 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 1.9690721649484537) internal successors, (191), 96 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) [2021-11-21 01:07:03,578 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 192 transitions. [2021-11-21 01:07:03,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2021-11-21 01:07:03,579 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:07:03,579 INFO L514 BasicCegarLoop]: trace histogram [47, 47, 46, 46, 1, 1, 1, 1] [2021-11-21 01:07:03,606 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Forceful destruction successful, exit code 0 [2021-11-21 01:07:03,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:03,780 INFO L402 AbstractCegarLoop]: === Iteration 94 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:07:03,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:07:03,780 INFO L85 PathProgramCache]: Analyzing trace with hash -349377238, now seen corresponding path program 92 times [2021-11-21 01:07:03,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:07:03,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511377189] [2021-11-21 01:07:03,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:03,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:07:03,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:04,986 INFO L134 CoverageAnalysis]: Checked inductivity of 4325 backedges. 1081 proven. 3244 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:04,986 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:07:04,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511377189] [2021-11-21 01:07:04,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [511377189] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:07:04,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1843363765] [2021-11-21 01:07:04,987 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:07:04,987 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:04,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:07:04,988 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:07:04,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2021-11-21 01:07:05,263 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2021-11-21 01:07:05,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:07:05,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 733 conjuncts, 97 conjunts are in the unsatisfiable core [2021-11-21 01:07:05,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:07:05,740 INFO L134 CoverageAnalysis]: Checked inductivity of 4325 backedges. 1128 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:05,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:07:06,214 INFO L134 CoverageAnalysis]: Checked inductivity of 4325 backedges. 1128 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:06,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1843363765] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:07:06,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1422797118] [2021-11-21 01:07:06,215 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:07:06,215 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:07:06,215 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:07:06,215 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:07:06,215 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:07:06,971 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:07:07,286 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:07:07,287 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:07:07,287 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 52 [2021-11-21 01:07:07,287 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278569988] [2021-11-21 01:07:07,287 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:07:07,288 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-21 01:07:07,288 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:07:07,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-21 01:07:07,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1254, Invalid=2052, Unknown=0, NotChecked=0, Total=3306 [2021-11-21 01:07:07,289 INFO L87 Difference]: Start difference. First operand 191 states and 192 transitions. Second operand has 53 states, 53 states have (on average 3.660377358490566) internal successors, (194), 52 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:08,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:07:08,582 INFO L93 Difference]: Finished difference Result 202 states and 203 transitions. [2021-11-21 01:07:08,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2021-11-21 01:07:08,583 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 3.660377358490566) internal successors, (194), 52 states have internal predecessors, (194), 0 states have call successors, (0), 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 190 [2021-11-21 01:07:08,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:07:08,584 INFO L225 Difference]: With dead ends: 202 [2021-11-21 01:07:08,584 INFO L226 Difference]: Without dead ends: 200 [2021-11-21 01:07:08,585 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 713 GetRequests, 606 SyntacticMatches, 2 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2924 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=3805, Invalid=7537, Unknown=0, NotChecked=0, Total=11342 [2021-11-21 01:07:08,585 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 150 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 477 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 670 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 477 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:07:08,585 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 21 Invalid, 670 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 477 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:07:08,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-11-21 01:07:08,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 194. [2021-11-21 01:07:08,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 193 states have (on average 1.0103626943005182) internal successors, (195), 193 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) [2021-11-21 01:07:08,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 195 transitions. [2021-11-21 01:07:08,622 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 195 transitions. Word has length 190 [2021-11-21 01:07:08,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:07:08,623 INFO L470 AbstractCegarLoop]: Abstraction has 194 states and 195 transitions. [2021-11-21 01:07:08,623 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 3.660377358490566) internal successors, (194), 52 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:08,623 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 195 transitions. [2021-11-21 01:07:08,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2021-11-21 01:07:08,624 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:07:08,624 INFO L514 BasicCegarLoop]: trace histogram [48, 47, 47, 47, 1, 1, 1, 1] [2021-11-21 01:07:08,651 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Forceful destruction successful, exit code 0 [2021-11-21 01:07:08,824 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:08,825 INFO L402 AbstractCegarLoop]: === Iteration 95 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:07:08,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:07:08,825 INFO L85 PathProgramCache]: Analyzing trace with hash -1586718769, now seen corresponding path program 93 times [2021-11-21 01:07:08,825 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:07:08,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1446540179] [2021-11-21 01:07:08,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:08,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:07:08,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:11,842 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 3337 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:11,842 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:07:11,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1446540179] [2021-11-21 01:07:11,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1446540179] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:07:11,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [644635152] [2021-11-21 01:07:11,842 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:07:11,842 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:11,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:07:11,843 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:07:11,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Waiting until timeout for monitored process [2021-11-21 01:07:11,982 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:07:11,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:07:11,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 743 conjuncts, 98 conjunts are in the unsatisfiable core [2021-11-21 01:07:11,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:07:12,471 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 3337 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:12,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:07:12,924 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 3337 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:12,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [644635152] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:07:12,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1019182911] [2021-11-21 01:07:12,925 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:07:12,926 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:07:12,926 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:07:12,926 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:07:12,926 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:07:13,681 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:07:14,136 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:07:14,136 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:07:14,136 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 98 [2021-11-21 01:07:14,137 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802895783] [2021-11-21 01:07:14,137 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:07:14,137 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2021-11-21 01:07:14,137 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:07:14,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2021-11-21 01:07:14,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2515, Invalid=8197, Unknown=0, NotChecked=0, Total=10712 [2021-11-21 01:07:14,139 INFO L87 Difference]: Start difference. First operand 194 states and 195 transitions. Second operand has 99 states, 99 states have (on average 1.9696969696969697) internal successors, (195), 98 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) [2021-11-21 01:07:16,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:07:16,312 INFO L93 Difference]: Finished difference Result 342 states and 344 transitions. [2021-11-21 01:07:16,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-11-21 01:07:16,312 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 1.9696969696969697) internal successors, (195), 98 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) Word has length 193 [2021-11-21 01:07:16,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:07:16,313 INFO L225 Difference]: With dead ends: 342 [2021-11-21 01:07:16,313 INFO L226 Difference]: Without dead ends: 195 [2021-11-21 01:07:16,315 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 572 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4102 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=4963, Invalid=17989, Unknown=0, NotChecked=0, Total=22952 [2021-11-21 01:07:16,315 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 3 mSDsluCounter, 358 mSDsCounter, 0 mSdLazyCounter, 837 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 407 SdHoareTripleChecker+Invalid, 845 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 837 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:07:16,315 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 407 Invalid, 845 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 837 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:07:16,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-11-21 01:07:16,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 195. [2021-11-21 01:07:16,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 194 states have (on average 1.0103092783505154) internal successors, (196), 194 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:16,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 196 transitions. [2021-11-21 01:07:16,353 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 196 transitions. Word has length 193 [2021-11-21 01:07:16,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:07:16,353 INFO L470 AbstractCegarLoop]: Abstraction has 195 states and 196 transitions. [2021-11-21 01:07:16,353 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 99 states have (on average 1.9696969696969697) internal successors, (195), 98 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) [2021-11-21 01:07:16,353 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 196 transitions. [2021-11-21 01:07:16,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2021-11-21 01:07:16,354 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:07:16,355 INFO L514 BasicCegarLoop]: trace histogram [48, 48, 47, 47, 1, 1, 1, 1] [2021-11-21 01:07:16,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Forceful destruction successful, exit code 0 [2021-11-21 01:07:16,569 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable94 [2021-11-21 01:07:16,570 INFO L402 AbstractCegarLoop]: === Iteration 96 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:07:16,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:07:16,570 INFO L85 PathProgramCache]: Analyzing trace with hash 1099495558, now seen corresponding path program 94 times [2021-11-21 01:07:16,570 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:07:16,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1722398043] [2021-11-21 01:07:16,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:16,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:07:16,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:17,861 INFO L134 CoverageAnalysis]: Checked inductivity of 4513 backedges. 1128 proven. 3385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:17,861 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:07:17,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1722398043] [2021-11-21 01:07:17,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1722398043] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:07:17,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1754814785] [2021-11-21 01:07:17,861 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:07:17,861 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:17,862 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:07:17,862 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:07:17,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Waiting until timeout for monitored process [2021-11-21 01:07:18,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:18,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 748 conjuncts, 99 conjunts are in the unsatisfiable core [2021-11-21 01:07:18,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:07:18,510 INFO L134 CoverageAnalysis]: Checked inductivity of 4513 backedges. 1176 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:18,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:07:18,979 INFO L134 CoverageAnalysis]: Checked inductivity of 4513 backedges. 1176 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:18,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1754814785] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:07:18,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1288685331] [2021-11-21 01:07:18,980 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:07:18,981 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:07:18,981 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:07:18,981 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:07:18,981 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:07:19,738 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:07:20,076 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:07:20,076 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:07:20,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 53 [2021-11-21 01:07:20,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281942534] [2021-11-21 01:07:20,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:07:20,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-21 01:07:20,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:07:20,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-21 01:07:20,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1304, Invalid=2118, Unknown=0, NotChecked=0, Total=3422 [2021-11-21 01:07:20,078 INFO L87 Difference]: Start difference. First operand 195 states and 196 transitions. Second operand has 54 states, 54 states have (on average 3.6666666666666665) internal successors, (198), 53 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:21,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:07:21,391 INFO L93 Difference]: Finished difference Result 206 states and 207 transitions. [2021-11-21 01:07:21,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2021-11-21 01:07:21,392 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 3.6666666666666665) internal successors, (198), 53 states have internal predecessors, (198), 0 states have call successors, (0), 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 194 [2021-11-21 01:07:21,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:07:21,393 INFO L225 Difference]: With dead ends: 206 [2021-11-21 01:07:21,393 INFO L226 Difference]: Without dead ends: 204 [2021-11-21 01:07:21,394 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 728 GetRequests, 619 SyntacticMatches, 2 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3034 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=3957, Invalid=7815, Unknown=0, NotChecked=0, Total=11772 [2021-11-21 01:07:21,395 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 202 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 475 mSolverCounterSat, 244 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 202 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 719 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 244 IncrementalHoareTripleChecker+Valid, 475 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:07:21,395 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [202 Valid, 17 Invalid, 719 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [244 Valid, 475 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:07:21,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2021-11-21 01:07:21,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 198. [2021-11-21 01:07:21,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 197 states have (on average 1.0101522842639594) internal successors, (199), 197 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:21,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 199 transitions. [2021-11-21 01:07:21,445 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 199 transitions. Word has length 194 [2021-11-21 01:07:21,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:07:21,445 INFO L470 AbstractCegarLoop]: Abstraction has 198 states and 199 transitions. [2021-11-21 01:07:21,445 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 3.6666666666666665) internal successors, (198), 53 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:21,445 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 199 transitions. [2021-11-21 01:07:21,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2021-11-21 01:07:21,446 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:07:21,446 INFO L514 BasicCegarLoop]: trace histogram [49, 48, 48, 48, 1, 1, 1, 1] [2021-11-21 01:07:21,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Forceful destruction successful, exit code 0 [2021-11-21 01:07:21,647 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:21,647 INFO L402 AbstractCegarLoop]: === Iteration 97 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:07:21,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:07:21,647 INFO L85 PathProgramCache]: Analyzing trace with hash 1656389363, now seen corresponding path program 95 times [2021-11-21 01:07:21,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:07:21,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1912217759] [2021-11-21 01:07:21,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:21,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:07:21,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:24,692 INFO L134 CoverageAnalysis]: Checked inductivity of 4656 backedges. 3480 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:24,693 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:07:24,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1912217759] [2021-11-21 01:07:24,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1912217759] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:07:24,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1977044277] [2021-11-21 01:07:24,693 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:07:24,693 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:24,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:07:24,694 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:07:24,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2021-11-21 01:07:24,964 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 49 check-sat command(s) [2021-11-21 01:07:24,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:07:24,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 758 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-21 01:07:24,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:07:25,464 INFO L134 CoverageAnalysis]: Checked inductivity of 4656 backedges. 3480 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:25,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:07:25,924 INFO L134 CoverageAnalysis]: Checked inductivity of 4656 backedges. 3480 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:25,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1977044277] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:07:25,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [463337692] [2021-11-21 01:07:25,926 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:07:25,926 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:07:25,926 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:07:25,926 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:07:25,927 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:07:26,677 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:07:27,160 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:07:27,160 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:07:27,161 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 100 [2021-11-21 01:07:27,161 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606498586] [2021-11-21 01:07:27,161 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:07:27,162 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2021-11-21 01:07:27,162 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:07:27,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2021-11-21 01:07:27,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2616, Invalid=8514, Unknown=0, NotChecked=0, Total=11130 [2021-11-21 01:07:27,163 INFO L87 Difference]: Start difference. First operand 198 states and 199 transitions. Second operand has 101 states, 101 states have (on average 1.9702970297029703) internal successors, (199), 100 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:29,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:07:29,646 INFO L93 Difference]: Finished difference Result 349 states and 351 transitions. [2021-11-21 01:07:29,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-21 01:07:29,646 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.9702970297029703) internal successors, (199), 100 states have internal predecessors, (199), 0 states have call successors, (0), 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 197 [2021-11-21 01:07:29,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:07:29,647 INFO L225 Difference]: With dead ends: 349 [2021-11-21 01:07:29,647 INFO L226 Difference]: Without dead ends: 199 [2021-11-21 01:07:29,649 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 737 GetRequests, 584 SyntacticMatches, 0 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4261 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=5164, Invalid=18706, Unknown=0, NotChecked=0, Total=23870 [2021-11-21 01:07:29,649 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 3 mSDsluCounter, 539 mSDsCounter, 0 mSdLazyCounter, 1221 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 589 SdHoareTripleChecker+Invalid, 1227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:07:29,649 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 589 Invalid, 1227 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 1221 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:07:29,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-11-21 01:07:29,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199. [2021-11-21 01:07:29,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 198 states have (on average 1.0101010101010102) internal successors, (200), 198 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:29,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 200 transitions. [2021-11-21 01:07:29,711 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 200 transitions. Word has length 197 [2021-11-21 01:07:29,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:07:29,711 INFO L470 AbstractCegarLoop]: Abstraction has 199 states and 200 transitions. [2021-11-21 01:07:29,711 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.9702970297029703) internal successors, (199), 100 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:29,712 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 200 transitions. [2021-11-21 01:07:29,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2021-11-21 01:07:29,712 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:07:29,713 INFO L514 BasicCegarLoop]: trace histogram [49, 49, 48, 48, 1, 1, 1, 1] [2021-11-21 01:07:29,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Forceful destruction successful, exit code 0 [2021-11-21 01:07:29,913 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:29,913 INFO L402 AbstractCegarLoop]: === Iteration 98 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:07:29,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:07:29,914 INFO L85 PathProgramCache]: Analyzing trace with hash -407262166, now seen corresponding path program 96 times [2021-11-21 01:07:29,914 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:07:29,914 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977775674] [2021-11-21 01:07:29,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:29,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:07:29,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:31,212 INFO L134 CoverageAnalysis]: Checked inductivity of 4705 backedges. 1176 proven. 3529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:31,212 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:07:31,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977775674] [2021-11-21 01:07:31,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [977775674] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:07:31,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [415523902] [2021-11-21 01:07:31,213 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:07:31,213 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:31,213 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:07:31,214 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:07:31,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Waiting until timeout for monitored process [2021-11-21 01:07:31,365 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:07:31,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:07:31,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 763 conjuncts, 101 conjunts are in the unsatisfiable core [2021-11-21 01:07:31,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:07:31,875 INFO L134 CoverageAnalysis]: Checked inductivity of 4705 backedges. 1225 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:31,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:07:32,360 INFO L134 CoverageAnalysis]: Checked inductivity of 4705 backedges. 1225 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:32,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [415523902] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:07:32,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [547730254] [2021-11-21 01:07:32,361 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:07:32,361 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:07:32,361 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:07:32,362 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:07:32,362 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:07:33,071 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:07:33,364 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:07:33,364 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:07:33,365 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 54 [2021-11-21 01:07:33,365 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1247253940] [2021-11-21 01:07:33,365 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:07:33,365 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-21 01:07:33,366 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:07:33,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-21 01:07:33,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1355, Invalid=2185, Unknown=0, NotChecked=0, Total=3540 [2021-11-21 01:07:33,366 INFO L87 Difference]: Start difference. First operand 199 states and 200 transitions. Second operand has 55 states, 55 states have (on average 3.672727272727273) internal successors, (202), 54 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:34,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:07:34,645 INFO L93 Difference]: Finished difference Result 210 states and 211 transitions. [2021-11-21 01:07:34,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2021-11-21 01:07:34,645 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.672727272727273) internal successors, (202), 54 states have internal predecessors, (202), 0 states have call successors, (0), 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 198 [2021-11-21 01:07:34,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:07:34,647 INFO L225 Difference]: With dead ends: 210 [2021-11-21 01:07:34,647 INFO L226 Difference]: Without dead ends: 208 [2021-11-21 01:07:34,647 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 743 GetRequests, 632 SyntacticMatches, 2 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3146 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=4112, Invalid=8098, Unknown=0, NotChecked=0, Total=12210 [2021-11-21 01:07:34,648 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 206 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 484 mSolverCounterSat, 249 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 733 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 249 IncrementalHoareTripleChecker+Valid, 484 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:07:34,648 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [206 Valid, 17 Invalid, 733 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [249 Valid, 484 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:07:34,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-11-21 01:07:34,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 202. [2021-11-21 01:07:34,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 201 states have (on average 1.0099502487562189) internal successors, (203), 201 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:34,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 203 transitions. [2021-11-21 01:07:34,685 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 203 transitions. Word has length 198 [2021-11-21 01:07:34,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:07:34,686 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 203 transitions. [2021-11-21 01:07:34,686 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.672727272727273) internal successors, (202), 54 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:34,686 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 203 transitions. [2021-11-21 01:07:34,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2021-11-21 01:07:34,688 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:07:34,688 INFO L514 BasicCegarLoop]: trace histogram [50, 49, 49, 49, 1, 1, 1, 1] [2021-11-21 01:07:34,728 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Forceful destruction successful, exit code 0 [2021-11-21 01:07:34,905 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable97,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:34,905 INFO L402 AbstractCegarLoop]: === Iteration 99 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:07:34,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:07:34,906 INFO L85 PathProgramCache]: Analyzing trace with hash 540244175, now seen corresponding path program 97 times [2021-11-21 01:07:34,906 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:07:34,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1146018668] [2021-11-21 01:07:34,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:34,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:07:34,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:38,200 INFO L134 CoverageAnalysis]: Checked inductivity of 4851 backedges. 3626 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:38,200 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:07:38,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1146018668] [2021-11-21 01:07:38,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1146018668] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:07:38,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [118640637] [2021-11-21 01:07:38,201 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:07:38,201 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:38,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:07:38,202 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:07:38,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Waiting until timeout for monitored process [2021-11-21 01:07:38,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:38,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 773 conjuncts, 102 conjunts are in the unsatisfiable core [2021-11-21 01:07:38,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:07:38,835 INFO L134 CoverageAnalysis]: Checked inductivity of 4851 backedges. 3626 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:38,835 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:07:39,290 INFO L134 CoverageAnalysis]: Checked inductivity of 4851 backedges. 3626 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:39,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [118640637] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:07:39,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [295501646] [2021-11-21 01:07:39,292 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:07:39,292 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:07:39,292 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:07:39,292 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:07:39,292 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:07:40,016 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:07:40,476 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:07:40,476 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:07:40,477 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 102 [2021-11-21 01:07:40,477 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239560143] [2021-11-21 01:07:40,477 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:07:40,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2021-11-21 01:07:40,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:07:40,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2021-11-21 01:07:40,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2719, Invalid=8837, Unknown=0, NotChecked=0, Total=11556 [2021-11-21 01:07:40,479 INFO L87 Difference]: Start difference. First operand 202 states and 203 transitions. Second operand has 103 states, 103 states have (on average 1.970873786407767) internal successors, (203), 102 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:42,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:07:42,799 INFO L93 Difference]: Finished difference Result 356 states and 358 transitions. [2021-11-21 01:07:42,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2021-11-21 01:07:42,799 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 1.970873786407767) internal successors, (203), 102 states have internal predecessors, (203), 0 states have call successors, (0), 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 201 [2021-11-21 01:07:42,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:07:42,801 INFO L225 Difference]: With dead ends: 356 [2021-11-21 01:07:42,801 INFO L226 Difference]: Without dead ends: 203 [2021-11-21 01:07:42,802 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 752 GetRequests, 596 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4423 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=5369, Invalid=19437, Unknown=0, NotChecked=0, Total=24806 [2021-11-21 01:07:42,803 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 3 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 788 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 383 SdHoareTripleChecker+Invalid, 794 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 788 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:07:42,803 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 383 Invalid, 794 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 788 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:07:42,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2021-11-21 01:07:42,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 203. [2021-11-21 01:07:42,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 202 states have (on average 1.00990099009901) internal successors, (204), 202 states have internal predecessors, (204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:42,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 204 transitions. [2021-11-21 01:07:42,856 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 204 transitions. Word has length 201 [2021-11-21 01:07:42,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:07:42,856 INFO L470 AbstractCegarLoop]: Abstraction has 203 states and 204 transitions. [2021-11-21 01:07:42,857 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 1.970873786407767) internal successors, (203), 102 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:42,857 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 204 transitions. [2021-11-21 01:07:42,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2021-11-21 01:07:42,858 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:07:42,858 INFO L514 BasicCegarLoop]: trace histogram [50, 50, 49, 49, 1, 1, 1, 1] [2021-11-21 01:07:42,885 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Ended with exit code 0 [2021-11-21 01:07:43,065 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:43,065 INFO L402 AbstractCegarLoop]: === Iteration 100 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:07:43,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:07:43,066 INFO L85 PathProgramCache]: Analyzing trace with hash -1965346170, now seen corresponding path program 98 times [2021-11-21 01:07:43,066 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:07:43,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629806280] [2021-11-21 01:07:43,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:43,066 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:07:43,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:44,463 INFO L134 CoverageAnalysis]: Checked inductivity of 4901 backedges. 1225 proven. 3676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:44,463 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:07:44,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629806280] [2021-11-21 01:07:44,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629806280] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:07:44,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1401127882] [2021-11-21 01:07:44,463 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:07:44,463 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:44,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:07:44,465 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:07:44,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2021-11-21 01:07:44,743 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2021-11-21 01:07:44,743 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:07:44,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 778 conjuncts, 103 conjunts are in the unsatisfiable core [2021-11-21 01:07:44,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:07:45,240 INFO L134 CoverageAnalysis]: Checked inductivity of 4901 backedges. 1275 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:45,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:07:45,731 INFO L134 CoverageAnalysis]: Checked inductivity of 4901 backedges. 1275 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:45,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1401127882] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:07:45,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1550046529] [2021-11-21 01:07:45,732 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:07:45,732 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:07:45,732 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:07:45,732 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:07:45,737 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:07:46,418 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:07:46,725 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:07:46,725 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:07:46,726 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 55 [2021-11-21 01:07:46,726 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451803027] [2021-11-21 01:07:46,726 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:07:46,727 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-21 01:07:46,727 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:07:46,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-21 01:07:46,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1407, Invalid=2253, Unknown=0, NotChecked=0, Total=3660 [2021-11-21 01:07:46,728 INFO L87 Difference]: Start difference. First operand 203 states and 204 transitions. Second operand has 56 states, 56 states have (on average 3.6785714285714284) internal successors, (206), 55 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:47,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:07:47,958 INFO L93 Difference]: Finished difference Result 214 states and 215 transitions. [2021-11-21 01:07:47,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2021-11-21 01:07:47,958 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.6785714285714284) internal successors, (206), 55 states have internal predecessors, (206), 0 states have call successors, (0), 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 202 [2021-11-21 01:07:47,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:07:47,959 INFO L225 Difference]: With dead ends: 214 [2021-11-21 01:07:47,959 INFO L226 Difference]: Without dead ends: 212 [2021-11-21 01:07:47,960 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 758 GetRequests, 645 SyntacticMatches, 2 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3260 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=4270, Invalid=8386, Unknown=0, NotChecked=0, Total=12656 [2021-11-21 01:07:47,960 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 108 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 617 mSolverCounterSat, 155 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 772 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 155 IncrementalHoareTripleChecker+Valid, 617 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:07:47,960 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 22 Invalid, 772 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [155 Valid, 617 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:07:47,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-11-21 01:07:47,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 206. [2021-11-21 01:07:47,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 205 states have (on average 1.0097560975609756) internal successors, (207), 205 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:47,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 207 transitions. [2021-11-21 01:07:47,993 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 207 transitions. Word has length 202 [2021-11-21 01:07:47,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:07:47,994 INFO L470 AbstractCegarLoop]: Abstraction has 206 states and 207 transitions. [2021-11-21 01:07:47,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 3.6785714285714284) internal successors, (206), 55 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:47,994 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 207 transitions. [2021-11-21 01:07:47,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2021-11-21 01:07:47,995 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:07:47,995 INFO L514 BasicCegarLoop]: trace histogram [51, 50, 50, 50, 1, 1, 1, 1] [2021-11-21 01:07:48,021 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Ended with exit code 0 [2021-11-21 01:07:48,209 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable99,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:48,209 INFO L402 AbstractCegarLoop]: === Iteration 101 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:07:48,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:07:48,210 INFO L85 PathProgramCache]: Analyzing trace with hash -628751117, now seen corresponding path program 99 times [2021-11-21 01:07:48,210 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:07:48,210 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [984155644] [2021-11-21 01:07:48,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:48,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:07:48,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:51,197 INFO L134 CoverageAnalysis]: Checked inductivity of 5050 backedges. 3775 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:51,197 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:07:51,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [984155644] [2021-11-21 01:07:51,197 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [984155644] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:07:51,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2014899750] [2021-11-21 01:07:51,198 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:07:51,198 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:51,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:07:51,198 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:07:51,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Waiting until timeout for monitored process [2021-11-21 01:07:51,331 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:07:51,331 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:07:51,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 788 conjuncts, 104 conjunts are in the unsatisfiable core [2021-11-21 01:07:51,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:07:51,756 INFO L134 CoverageAnalysis]: Checked inductivity of 5050 backedges. 3775 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:51,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:07:52,177 INFO L134 CoverageAnalysis]: Checked inductivity of 5050 backedges. 3775 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:52,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2014899750] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:07:52,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1734630970] [2021-11-21 01:07:52,179 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:07:52,179 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:07:52,179 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:07:52,179 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:07:52,179 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:07:52,820 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:07:53,254 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:07:53,254 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:07:53,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 103, 103] total 104 [2021-11-21 01:07:53,254 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894499966] [2021-11-21 01:07:53,254 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:07:53,255 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2021-11-21 01:07:53,255 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:07:53,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2021-11-21 01:07:53,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2824, Invalid=9166, Unknown=0, NotChecked=0, Total=11990 [2021-11-21 01:07:53,256 INFO L87 Difference]: Start difference. First operand 206 states and 207 transitions. Second operand has 105 states, 105 states have (on average 1.9714285714285715) internal successors, (207), 104 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:55,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:07:55,527 INFO L93 Difference]: Finished difference Result 363 states and 365 transitions. [2021-11-21 01:07:55,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-11-21 01:07:55,527 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 1.9714285714285715) internal successors, (207), 104 states have internal predecessors, (207), 0 states have call successors, (0), 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 205 [2021-11-21 01:07:55,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:07:55,528 INFO L225 Difference]: With dead ends: 363 [2021-11-21 01:07:55,529 INFO L226 Difference]: Without dead ends: 207 [2021-11-21 01:07:55,531 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 767 GetRequests, 608 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4588 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=5578, Invalid=20182, Unknown=0, NotChecked=0, Total=25760 [2021-11-21 01:07:55,531 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 3 mSDsluCounter, 475 mSDsCounter, 0 mSdLazyCounter, 1078 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 1085 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1078 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:07:55,532 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 527 Invalid, 1085 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1078 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:07:55,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2021-11-21 01:07:55,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2021-11-21 01:07:55,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 206 states have (on average 1.0097087378640777) internal successors, (208), 206 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:55,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 208 transitions. [2021-11-21 01:07:55,572 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 208 transitions. Word has length 205 [2021-11-21 01:07:55,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:07:55,572 INFO L470 AbstractCegarLoop]: Abstraction has 207 states and 208 transitions. [2021-11-21 01:07:55,572 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 105 states have (on average 1.9714285714285715) internal successors, (207), 104 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:07:55,572 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 208 transitions. [2021-11-21 01:07:55,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2021-11-21 01:07:55,573 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:07:55,573 INFO L514 BasicCegarLoop]: trace histogram [51, 51, 50, 50, 1, 1, 1, 1] [2021-11-21 01:07:55,597 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Forceful destruction successful, exit code 0 [2021-11-21 01:07:55,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable100 [2021-11-21 01:07:55,774 INFO L402 AbstractCegarLoop]: === Iteration 102 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:07:55,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:07:55,774 INFO L85 PathProgramCache]: Analyzing trace with hash -759428310, now seen corresponding path program 100 times [2021-11-21 01:07:55,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:07:55,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561890469] [2021-11-21 01:07:55,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:55,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:07:55,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:57,053 INFO L134 CoverageAnalysis]: Checked inductivity of 5101 backedges. 1275 proven. 3826 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:57,053 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:07:57,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561890469] [2021-11-21 01:07:57,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [561890469] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:07:57,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2098160444] [2021-11-21 01:07:57,054 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:07:57,054 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:57,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:07:57,055 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:07:57,056 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Waiting until timeout for monitored process [2021-11-21 01:07:57,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:57,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 793 conjuncts, 105 conjunts are in the unsatisfiable core [2021-11-21 01:07:57,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:07:57,640 INFO L134 CoverageAnalysis]: Checked inductivity of 5101 backedges. 1326 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:57,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:07:58,090 INFO L134 CoverageAnalysis]: Checked inductivity of 5101 backedges. 1326 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:07:58,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2098160444] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:07:58,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2136686671] [2021-11-21 01:07:58,091 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:07:58,091 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:07:58,091 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:07:58,091 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:07:58,091 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:07:58,767 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:07:59,079 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:07:59,079 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:07:59,079 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 56 [2021-11-21 01:07:59,079 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251938554] [2021-11-21 01:07:59,079 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:07:59,080 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-21 01:07:59,080 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:07:59,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-21 01:07:59,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1460, Invalid=2322, Unknown=0, NotChecked=0, Total=3782 [2021-11-21 01:07:59,080 INFO L87 Difference]: Start difference. First operand 207 states and 208 transitions. Second operand has 57 states, 57 states have (on average 3.6842105263157894) internal successors, (210), 56 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:00,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:08:00,319 INFO L93 Difference]: Finished difference Result 218 states and 219 transitions. [2021-11-21 01:08:00,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2021-11-21 01:08:00,330 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 3.6842105263157894) internal successors, (210), 56 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 206 [2021-11-21 01:08:00,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:08:00,331 INFO L225 Difference]: With dead ends: 218 [2021-11-21 01:08:00,331 INFO L226 Difference]: Without dead ends: 216 [2021-11-21 01:08:00,331 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 773 GetRequests, 658 SyntacticMatches, 2 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3376 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=4431, Invalid=8679, Unknown=0, NotChecked=0, Total=13110 [2021-11-21 01:08:00,332 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 114 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 562 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 720 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 562 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:08:00,332 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 22 Invalid, 720 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 562 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:08:00,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-11-21 01:08:00,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 210. [2021-11-21 01:08:00,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 209 states have (on average 1.0095693779904307) internal successors, (211), 209 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:00,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 211 transitions. [2021-11-21 01:08:00,369 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 211 transitions. Word has length 206 [2021-11-21 01:08:00,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:08:00,369 INFO L470 AbstractCegarLoop]: Abstraction has 210 states and 211 transitions. [2021-11-21 01:08:00,369 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 3.6842105263157894) internal successors, (210), 56 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:00,370 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 211 transitions. [2021-11-21 01:08:00,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2021-11-21 01:08:00,370 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:08:00,370 INFO L514 BasicCegarLoop]: trace histogram [52, 51, 51, 51, 1, 1, 1, 1] [2021-11-21 01:08:00,395 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Forceful destruction successful, exit code 0 [2021-11-21 01:08:00,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable101 [2021-11-21 01:08:00,571 INFO L402 AbstractCegarLoop]: === Iteration 103 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:08:00,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:08:00,571 INFO L85 PathProgramCache]: Analyzing trace with hash 1763752399, now seen corresponding path program 101 times [2021-11-21 01:08:00,571 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:08:00,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1521797079] [2021-11-21 01:08:00,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:08:00,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:08:00,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:08:03,602 INFO L134 CoverageAnalysis]: Checked inductivity of 5253 backedges. 3927 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:03,603 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:08:03,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1521797079] [2021-11-21 01:08:03,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1521797079] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:08:03,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861523752] [2021-11-21 01:08:03,603 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:08:03,603 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:08:03,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:08:03,604 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:08:03,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2021-11-21 01:08:03,890 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2021-11-21 01:08:03,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:08:03,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 803 conjuncts, 106 conjunts are in the unsatisfiable core [2021-11-21 01:08:03,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:08:04,325 INFO L134 CoverageAnalysis]: Checked inductivity of 5253 backedges. 3927 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:04,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:08:04,745 INFO L134 CoverageAnalysis]: Checked inductivity of 5253 backedges. 3927 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:04,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861523752] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:08:04,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1140305791] [2021-11-21 01:08:04,746 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:08:04,746 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:08:04,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:08:04,746 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:08:04,747 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:08:05,402 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:08:05,782 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:08:05,782 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:08:05,782 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [105, 105, 105] total 106 [2021-11-21 01:08:05,782 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81699095] [2021-11-21 01:08:05,782 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:08:05,782 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2021-11-21 01:08:05,783 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:08:05,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-11-21 01:08:05,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2931, Invalid=9501, Unknown=0, NotChecked=0, Total=12432 [2021-11-21 01:08:05,784 INFO L87 Difference]: Start difference. First operand 210 states and 211 transitions. Second operand has 107 states, 107 states have (on average 1.97196261682243) internal successors, (211), 106 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:07,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:08:07,798 INFO L93 Difference]: Finished difference Result 370 states and 372 transitions. [2021-11-21 01:08:07,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2021-11-21 01:08:07,798 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 1.97196261682243) internal successors, (211), 106 states have internal predecessors, (211), 0 states have call successors, (0), 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 209 [2021-11-21 01:08:07,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:08:07,799 INFO L225 Difference]: With dead ends: 370 [2021-11-21 01:08:07,799 INFO L226 Difference]: Without dead ends: 211 [2021-11-21 01:08:07,800 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 782 GetRequests, 620 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4756 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=5791, Invalid=20941, Unknown=0, NotChecked=0, Total=26732 [2021-11-21 01:08:07,800 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 3 mSDsluCounter, 435 mSDsCounter, 0 mSdLazyCounter, 1002 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 488 SdHoareTripleChecker+Invalid, 1005 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 1002 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:08:07,801 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 488 Invalid, 1005 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 1002 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:08:07,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-11-21 01:08:07,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 211. [2021-11-21 01:08:07,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 210 states have (on average 1.0095238095238095) internal successors, (212), 210 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:07,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 212 transitions. [2021-11-21 01:08:07,834 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 212 transitions. Word has length 209 [2021-11-21 01:08:07,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:08:07,834 INFO L470 AbstractCegarLoop]: Abstraction has 211 states and 212 transitions. [2021-11-21 01:08:07,835 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 1.97196261682243) internal successors, (211), 106 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:07,835 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 212 transitions. [2021-11-21 01:08:07,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2021-11-21 01:08:07,836 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:08:07,836 INFO L514 BasicCegarLoop]: trace histogram [52, 52, 51, 51, 1, 1, 1, 1] [2021-11-21 01:08:07,856 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Ended with exit code 0 [2021-11-21 01:08:08,037 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable102,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:08:08,037 INFO L402 AbstractCegarLoop]: === Iteration 104 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:08:08,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:08:08,038 INFO L85 PathProgramCache]: Analyzing trace with hash -1377121146, now seen corresponding path program 102 times [2021-11-21 01:08:08,038 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:08:08,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689134136] [2021-11-21 01:08:08,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:08:08,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:08:08,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:08:09,237 INFO L134 CoverageAnalysis]: Checked inductivity of 5305 backedges. 1326 proven. 3979 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:09,237 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:08:09,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689134136] [2021-11-21 01:08:09,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [689134136] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:08:09,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1360130099] [2021-11-21 01:08:09,238 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:08:09,238 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:08:09,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:08:09,238 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:08:09,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2021-11-21 01:08:09,388 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:08:09,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:08:09,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 808 conjuncts, 107 conjunts are in the unsatisfiable core [2021-11-21 01:08:09,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:08:09,860 INFO L134 CoverageAnalysis]: Checked inductivity of 5305 backedges. 1378 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:09,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:08:10,332 INFO L134 CoverageAnalysis]: Checked inductivity of 5305 backedges. 1378 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:10,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1360130099] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:08:10,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1781078806] [2021-11-21 01:08:10,333 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:08:10,333 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:08:10,333 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:08:10,333 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:08:10,333 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:08:11,005 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:08:11,311 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:08:11,311 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:08:11,312 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 57 [2021-11-21 01:08:11,312 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109912830] [2021-11-21 01:08:11,312 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:08:11,312 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-21 01:08:11,312 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:08:11,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-21 01:08:11,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1514, Invalid=2392, Unknown=0, NotChecked=0, Total=3906 [2021-11-21 01:08:11,313 INFO L87 Difference]: Start difference. First operand 211 states and 212 transitions. Second operand has 58 states, 58 states have (on average 3.689655172413793) internal successors, (214), 57 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:12,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:08:12,470 INFO L93 Difference]: Finished difference Result 222 states and 223 transitions. [2021-11-21 01:08:12,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2021-11-21 01:08:12,470 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 3.689655172413793) internal successors, (214), 57 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 210 [2021-11-21 01:08:12,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:08:12,471 INFO L225 Difference]: With dead ends: 222 [2021-11-21 01:08:12,471 INFO L226 Difference]: Without dead ends: 220 [2021-11-21 01:08:12,473 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 788 GetRequests, 671 SyntacticMatches, 2 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3494 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=4595, Invalid=8977, Unknown=0, NotChecked=0, Total=13572 [2021-11-21 01:08:12,473 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 169 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 597 mSolverCounterSat, 212 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 809 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 212 IncrementalHoareTripleChecker+Valid, 597 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:08:12,473 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [169 Valid, 18 Invalid, 809 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [212 Valid, 597 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:08:12,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-11-21 01:08:12,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 214. [2021-11-21 01:08:12,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 213 states have (on average 1.0093896713615023) internal successors, (215), 213 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:12,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 215 transitions. [2021-11-21 01:08:12,509 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 215 transitions. Word has length 210 [2021-11-21 01:08:12,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:08:12,509 INFO L470 AbstractCegarLoop]: Abstraction has 214 states and 215 transitions. [2021-11-21 01:08:12,509 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 3.689655172413793) internal successors, (214), 57 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:12,509 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 215 transitions. [2021-11-21 01:08:12,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2021-11-21 01:08:12,517 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:08:12,517 INFO L514 BasicCegarLoop]: trace histogram [53, 52, 52, 52, 1, 1, 1, 1] [2021-11-21 01:08:12,538 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Forceful destruction successful, exit code 0 [2021-11-21 01:08:12,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable103 [2021-11-21 01:08:12,718 INFO L402 AbstractCegarLoop]: === Iteration 105 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:08:12,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:08:12,718 INFO L85 PathProgramCache]: Analyzing trace with hash -283628813, now seen corresponding path program 103 times [2021-11-21 01:08:12,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:08:12,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998995507] [2021-11-21 01:08:12,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:08:12,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:08:12,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:08:15,695 INFO L134 CoverageAnalysis]: Checked inductivity of 5460 backedges. 4082 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:15,695 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:08:15,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [998995507] [2021-11-21 01:08:15,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [998995507] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:08:15,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [733984822] [2021-11-21 01:08:15,695 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:08:15,696 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:08:15,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:08:15,696 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:08:15,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Waiting until timeout for monitored process [2021-11-21 01:08:15,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:08:15,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 818 conjuncts, 108 conjunts are in the unsatisfiable core [2021-11-21 01:08:15,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:08:16,360 INFO L134 CoverageAnalysis]: Checked inductivity of 5460 backedges. 4082 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:16,360 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:08:16,851 INFO L134 CoverageAnalysis]: Checked inductivity of 5460 backedges. 4082 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:16,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [733984822] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:08:16,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [842689676] [2021-11-21 01:08:16,852 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:08:16,853 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:08:16,853 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:08:16,853 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:08:16,853 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:08:17,575 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:08:18,048 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:08:18,048 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:08:18,048 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [107, 107, 107] total 108 [2021-11-21 01:08:18,048 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542120062] [2021-11-21 01:08:18,049 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:08:18,049 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2021-11-21 01:08:18,049 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:08:18,050 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-11-21 01:08:18,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3040, Invalid=9842, Unknown=0, NotChecked=0, Total=12882 [2021-11-21 01:08:18,051 INFO L87 Difference]: Start difference. First operand 214 states and 215 transitions. Second operand has 109 states, 109 states have (on average 1.9724770642201834) internal successors, (215), 108 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:20,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:08:20,637 INFO L93 Difference]: Finished difference Result 377 states and 379 transitions. [2021-11-21 01:08:20,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-11-21 01:08:20,637 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 1.9724770642201834) internal successors, (215), 108 states have internal predecessors, (215), 0 states have call successors, (0), 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 213 [2021-11-21 01:08:20,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:08:20,638 INFO L225 Difference]: With dead ends: 377 [2021-11-21 01:08:20,638 INFO L226 Difference]: Without dead ends: 215 [2021-11-21 01:08:20,639 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 797 GetRequests, 632 SyntacticMatches, 0 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4927 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=6008, Invalid=21714, Unknown=0, NotChecked=0, Total=27722 [2021-11-21 01:08:20,640 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 3 mSDsluCounter, 335 mSDsCounter, 0 mSdLazyCounter, 810 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 389 SdHoareTripleChecker+Invalid, 816 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 810 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:08:20,640 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 389 Invalid, 816 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 810 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:08:20,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2021-11-21 01:08:20,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 215. [2021-11-21 01:08:20,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 214 states have (on average 1.0093457943925233) internal successors, (216), 214 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:20,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 216 transitions. [2021-11-21 01:08:20,727 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 216 transitions. Word has length 213 [2021-11-21 01:08:20,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:08:20,727 INFO L470 AbstractCegarLoop]: Abstraction has 215 states and 216 transitions. [2021-11-21 01:08:20,727 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 1.9724770642201834) internal successors, (215), 108 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:20,727 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 216 transitions. [2021-11-21 01:08:20,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2021-11-21 01:08:20,728 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:08:20,728 INFO L514 BasicCegarLoop]: trace histogram [53, 53, 52, 52, 1, 1, 1, 1] [2021-11-21 01:08:20,755 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Forceful destruction successful, exit code 0 [2021-11-21 01:08:20,928 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:08:20,929 INFO L402 AbstractCegarLoop]: === Iteration 106 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:08:20,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:08:20,929 INFO L85 PathProgramCache]: Analyzing trace with hash -962852310, now seen corresponding path program 104 times [2021-11-21 01:08:20,929 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:08:20,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454731460] [2021-11-21 01:08:20,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:08:20,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:08:21,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:08:22,354 INFO L134 CoverageAnalysis]: Checked inductivity of 5513 backedges. 1378 proven. 4135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:22,354 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:08:22,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454731460] [2021-11-21 01:08:22,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1454731460] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:08:22,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1934751963] [2021-11-21 01:08:22,355 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:08:22,355 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:08:22,355 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:08:22,356 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:08:22,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2021-11-21 01:08:22,656 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 53 check-sat command(s) [2021-11-21 01:08:22,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:08:22,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 823 conjuncts, 109 conjunts are in the unsatisfiable core [2021-11-21 01:08:22,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:08:23,200 INFO L134 CoverageAnalysis]: Checked inductivity of 5513 backedges. 1431 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:23,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:08:23,669 INFO L134 CoverageAnalysis]: Checked inductivity of 5513 backedges. 1431 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:23,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1934751963] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:08:23,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2055639767] [2021-11-21 01:08:23,670 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:08:23,670 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:08:23,670 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:08:23,670 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:08:23,670 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:08:24,362 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:08:24,684 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:08:24,684 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:08:24,685 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 58 [2021-11-21 01:08:24,686 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505265429] [2021-11-21 01:08:24,686 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:08:24,686 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-21 01:08:24,686 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:08:24,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-21 01:08:24,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1569, Invalid=2463, Unknown=0, NotChecked=0, Total=4032 [2021-11-21 01:08:24,688 INFO L87 Difference]: Start difference. First operand 215 states and 216 transitions. Second operand has 59 states, 59 states have (on average 3.694915254237288) internal successors, (218), 58 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:26,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:08:26,070 INFO L93 Difference]: Finished difference Result 226 states and 227 transitions. [2021-11-21 01:08:26,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-11-21 01:08:26,070 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 3.694915254237288) internal successors, (218), 58 states have internal predecessors, (218), 0 states have call successors, (0), 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 214 [2021-11-21 01:08:26,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:08:26,071 INFO L225 Difference]: With dead ends: 226 [2021-11-21 01:08:26,071 INFO L226 Difference]: Without dead ends: 224 [2021-11-21 01:08:26,073 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 803 GetRequests, 684 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3614 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=4762, Invalid=9280, Unknown=0, NotChecked=0, Total=14042 [2021-11-21 01:08:26,074 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 173 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 545 mSolverCounterSat, 217 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 173 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 762 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 217 IncrementalHoareTripleChecker+Valid, 545 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:08:26,074 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [173 Valid, 17 Invalid, 762 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [217 Valid, 545 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:08:26,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-11-21 01:08:26,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 218. [2021-11-21 01:08:26,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 217 states have (on average 1.0092165898617511) internal successors, (219), 217 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:26,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 219 transitions. [2021-11-21 01:08:26,131 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 219 transitions. Word has length 214 [2021-11-21 01:08:26,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:08:26,131 INFO L470 AbstractCegarLoop]: Abstraction has 218 states and 219 transitions. [2021-11-21 01:08:26,131 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 3.694915254237288) internal successors, (218), 58 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:26,131 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 219 transitions. [2021-11-21 01:08:26,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2021-11-21 01:08:26,132 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:08:26,132 INFO L514 BasicCegarLoop]: trace histogram [54, 53, 53, 53, 1, 1, 1, 1] [2021-11-21 01:08:26,157 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Forceful destruction successful, exit code 0 [2021-11-21 01:08:26,332 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable105,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:08:26,333 INFO L402 AbstractCegarLoop]: === Iteration 107 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:08:26,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:08:26,333 INFO L85 PathProgramCache]: Analyzing trace with hash 1758223055, now seen corresponding path program 105 times [2021-11-21 01:08:26,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:08:26,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1625134859] [2021-11-21 01:08:26,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:08:26,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:08:26,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:08:29,978 INFO L134 CoverageAnalysis]: Checked inductivity of 5671 backedges. 4240 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:29,979 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:08:29,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1625134859] [2021-11-21 01:08:29,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1625134859] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:08:29,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1623047198] [2021-11-21 01:08:29,979 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:08:29,979 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:08:29,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:08:29,980 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:08:29,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Waiting until timeout for monitored process [2021-11-21 01:08:30,140 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:08:30,140 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:08:30,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 833 conjuncts, 110 conjunts are in the unsatisfiable core [2021-11-21 01:08:30,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:08:30,665 INFO L134 CoverageAnalysis]: Checked inductivity of 5671 backedges. 4240 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:30,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:08:31,180 INFO L134 CoverageAnalysis]: Checked inductivity of 5671 backedges. 4240 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:31,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1623047198] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:08:31,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1362566287] [2021-11-21 01:08:31,182 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:08:31,182 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:08:31,182 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:08:31,182 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:08:31,182 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:08:31,919 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:08:32,406 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:08:32,406 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:08:32,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [109, 109, 109] total 110 [2021-11-21 01:08:32,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164654675] [2021-11-21 01:08:32,407 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:08:32,407 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2021-11-21 01:08:32,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:08:32,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2021-11-21 01:08:32,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3151, Invalid=10189, Unknown=0, NotChecked=0, Total=13340 [2021-11-21 01:08:32,409 INFO L87 Difference]: Start difference. First operand 218 states and 219 transitions. Second operand has 111 states, 111 states have (on average 1.972972972972973) internal successors, (219), 110 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:35,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:08:35,296 INFO L93 Difference]: Finished difference Result 384 states and 386 transitions. [2021-11-21 01:08:35,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2021-11-21 01:08:35,296 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 111 states have (on average 1.972972972972973) internal successors, (219), 110 states have internal predecessors, (219), 0 states have call successors, (0), 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 217 [2021-11-21 01:08:35,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:08:35,297 INFO L225 Difference]: With dead ends: 384 [2021-11-21 01:08:35,297 INFO L226 Difference]: Without dead ends: 219 [2021-11-21 01:08:35,298 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 812 GetRequests, 644 SyntacticMatches, 0 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5101 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=6229, Invalid=22501, Unknown=0, NotChecked=0, Total=28730 [2021-11-21 01:08:35,299 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 3 mSDsluCounter, 488 mSDsCounter, 0 mSdLazyCounter, 1123 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 543 SdHoareTripleChecker+Invalid, 1129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:08:35,299 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 543 Invalid, 1129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 1123 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:08:35,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-11-21 01:08:35,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2021-11-21 01:08:35,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 218 states have (on average 1.0091743119266054) internal successors, (220), 218 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:35,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 220 transitions. [2021-11-21 01:08:35,345 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 220 transitions. Word has length 217 [2021-11-21 01:08:35,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:08:35,345 INFO L470 AbstractCegarLoop]: Abstraction has 219 states and 220 transitions. [2021-11-21 01:08:35,345 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 111 states, 111 states have (on average 1.972972972972973) internal successors, (219), 110 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:35,345 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 220 transitions. [2021-11-21 01:08:35,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2021-11-21 01:08:35,346 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:08:35,346 INFO L514 BasicCegarLoop]: trace histogram [54, 54, 53, 53, 1, 1, 1, 1] [2021-11-21 01:08:35,373 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Forceful destruction successful, exit code 0 [2021-11-21 01:08:35,546 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable106 [2021-11-21 01:08:35,547 INFO L402 AbstractCegarLoop]: === Iteration 108 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:08:35,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:08:35,547 INFO L85 PathProgramCache]: Analyzing trace with hash 273663622, now seen corresponding path program 106 times [2021-11-21 01:08:35,547 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:08:35,547 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [565956668] [2021-11-21 01:08:35,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:08:35,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:08:35,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:08:36,970 INFO L134 CoverageAnalysis]: Checked inductivity of 5725 backedges. 1431 proven. 4294 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:36,970 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:08:36,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [565956668] [2021-11-21 01:08:36,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [565956668] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:08:36,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [328350744] [2021-11-21 01:08:36,971 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:08:36,971 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:08:36,971 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:08:36,972 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:08:36,973 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Waiting until timeout for monitored process [2021-11-21 01:08:37,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:08:37,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 838 conjuncts, 111 conjunts are in the unsatisfiable core [2021-11-21 01:08:37,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:08:37,604 INFO L134 CoverageAnalysis]: Checked inductivity of 5725 backedges. 1485 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:37,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:08:38,089 INFO L134 CoverageAnalysis]: Checked inductivity of 5725 backedges. 1485 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:38,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [328350744] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:08:38,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [555684442] [2021-11-21 01:08:38,090 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:08:38,090 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:08:38,090 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:08:38,090 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:08:38,091 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:08:38,819 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:08:39,184 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:08:39,184 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:08:39,185 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 59 [2021-11-21 01:08:39,185 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919467223] [2021-11-21 01:08:39,185 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:08:39,185 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-21 01:08:39,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:08:39,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-21 01:08:39,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1625, Invalid=2535, Unknown=0, NotChecked=0, Total=4160 [2021-11-21 01:08:39,186 INFO L87 Difference]: Start difference. First operand 219 states and 220 transitions. Second operand has 60 states, 60 states have (on average 3.7) internal successors, (222), 59 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:40,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:08:40,600 INFO L93 Difference]: Finished difference Result 230 states and 231 transitions. [2021-11-21 01:08:40,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2021-11-21 01:08:40,601 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 3.7) internal successors, (222), 59 states have internal predecessors, (222), 0 states have call successors, (0), 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 218 [2021-11-21 01:08:40,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:08:40,601 INFO L225 Difference]: With dead ends: 230 [2021-11-21 01:08:40,601 INFO L226 Difference]: Without dead ends: 228 [2021-11-21 01:08:40,603 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 697 SyntacticMatches, 2 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3736 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=4932, Invalid=9588, Unknown=0, NotChecked=0, Total=14520 [2021-11-21 01:08:40,603 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 119 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 598 mSolverCounterSat, 167 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 765 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 167 IncrementalHoareTripleChecker+Valid, 598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:08:40,603 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [119 Valid, 20 Invalid, 765 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [167 Valid, 598 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:08:40,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2021-11-21 01:08:40,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 222. [2021-11-21 01:08:40,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 221 states have (on average 1.009049773755656) internal successors, (223), 221 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:40,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 223 transitions. [2021-11-21 01:08:40,648 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 223 transitions. Word has length 218 [2021-11-21 01:08:40,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:08:40,649 INFO L470 AbstractCegarLoop]: Abstraction has 222 states and 223 transitions. [2021-11-21 01:08:40,649 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 3.7) internal successors, (222), 59 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:40,649 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 223 transitions. [2021-11-21 01:08:40,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2021-11-21 01:08:40,650 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:08:40,650 INFO L514 BasicCegarLoop]: trace histogram [55, 54, 54, 54, 1, 1, 1, 1] [2021-11-21 01:08:40,675 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Forceful destruction successful, exit code 0 [2021-11-21 01:08:40,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable107 [2021-11-21 01:08:40,850 INFO L402 AbstractCegarLoop]: === Iteration 109 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:08:40,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:08:40,851 INFO L85 PathProgramCache]: Analyzing trace with hash 869855475, now seen corresponding path program 107 times [2021-11-21 01:08:40,851 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:08:40,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [308913643] [2021-11-21 01:08:40,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:08:40,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:08:40,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:08:44,543 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 4401 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:44,543 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:08:44,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [308913643] [2021-11-21 01:08:44,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [308913643] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:08:44,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1299585802] [2021-11-21 01:08:44,543 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:08:44,544 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:08:44,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:08:44,544 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:08:44,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Waiting until timeout for monitored process [2021-11-21 01:08:44,865 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 55 check-sat command(s) [2021-11-21 01:08:44,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:08:44,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 848 conjuncts, 112 conjunts are in the unsatisfiable core [2021-11-21 01:08:44,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:08:45,382 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 4401 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:45,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:08:45,889 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 4401 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:45,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1299585802] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:08:45,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [538213222] [2021-11-21 01:08:45,890 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:08:45,890 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:08:45,890 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:08:45,890 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:08:45,890 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:08:46,587 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:08:47,061 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:08:47,061 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:08:47,061 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [111, 111, 111] total 112 [2021-11-21 01:08:47,061 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691666207] [2021-11-21 01:08:47,062 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:08:47,062 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2021-11-21 01:08:47,062 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:08:47,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2021-11-21 01:08:47,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3264, Invalid=10542, Unknown=0, NotChecked=0, Total=13806 [2021-11-21 01:08:47,064 INFO L87 Difference]: Start difference. First operand 222 states and 223 transitions. Second operand has 113 states, 113 states have (on average 1.9734513274336283) internal successors, (223), 112 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:49,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:08:49,504 INFO L93 Difference]: Finished difference Result 391 states and 393 transitions. [2021-11-21 01:08:49,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-11-21 01:08:49,504 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 1.9734513274336283) internal successors, (223), 112 states have internal predecessors, (223), 0 states have call successors, (0), 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 221 [2021-11-21 01:08:49,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:08:49,505 INFO L225 Difference]: With dead ends: 391 [2021-11-21 01:08:49,505 INFO L226 Difference]: Without dead ends: 223 [2021-11-21 01:08:49,508 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 827 GetRequests, 656 SyntacticMatches, 0 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5278 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=6454, Invalid=23302, Unknown=0, NotChecked=0, Total=29756 [2021-11-21 01:08:49,508 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 3 mSDsluCounter, 476 mSDsCounter, 0 mSdLazyCounter, 1090 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 532 SdHoareTripleChecker+Invalid, 1096 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1090 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:08:49,508 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 532 Invalid, 1096 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 1090 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:08:49,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2021-11-21 01:08:49,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 223. [2021-11-21 01:08:49,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 222 states have (on average 1.009009009009009) internal successors, (224), 222 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:49,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 224 transitions. [2021-11-21 01:08:49,558 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 224 transitions. Word has length 221 [2021-11-21 01:08:49,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:08:49,559 INFO L470 AbstractCegarLoop]: Abstraction has 223 states and 224 transitions. [2021-11-21 01:08:49,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 1.9734513274336283) internal successors, (223), 112 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:49,559 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 224 transitions. [2021-11-21 01:08:49,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2021-11-21 01:08:49,560 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:08:49,560 INFO L514 BasicCegarLoop]: trace histogram [55, 55, 54, 54, 1, 1, 1, 1] [2021-11-21 01:08:49,600 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Forceful destruction successful, exit code 0 [2021-11-21 01:08:49,785 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable108,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:08:49,785 INFO L402 AbstractCegarLoop]: === Iteration 110 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:08:49,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:08:49,786 INFO L85 PathProgramCache]: Analyzing trace with hash 1338091818, now seen corresponding path program 108 times [2021-11-21 01:08:49,786 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:08:49,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593409955] [2021-11-21 01:08:49,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:08:49,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:08:49,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:08:51,050 INFO L134 CoverageAnalysis]: Checked inductivity of 5941 backedges. 1485 proven. 4456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:51,050 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:08:51,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593409955] [2021-11-21 01:08:51,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [593409955] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:08:51,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [801032481] [2021-11-21 01:08:51,050 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:08:51,050 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:08:51,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:08:51,051 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:08:51,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2021-11-21 01:08:51,193 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:08:51,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:08:51,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 853 conjuncts, 113 conjunts are in the unsatisfiable core [2021-11-21 01:08:51,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:08:51,637 INFO L134 CoverageAnalysis]: Checked inductivity of 5941 backedges. 1540 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:51,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:08:52,135 INFO L134 CoverageAnalysis]: Checked inductivity of 5941 backedges. 1540 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:52,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [801032481] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:08:52,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2005811921] [2021-11-21 01:08:52,136 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:08:52,136 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:08:52,136 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:08:52,136 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:08:52,137 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:08:52,720 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:08:52,993 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:08:52,993 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:08:52,993 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 60 [2021-11-21 01:08:52,993 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338772657] [2021-11-21 01:08:52,993 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:08:52,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-21 01:08:52,994 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:08:52,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-21 01:08:52,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1682, Invalid=2608, Unknown=0, NotChecked=0, Total=4290 [2021-11-21 01:08:52,994 INFO L87 Difference]: Start difference. First operand 223 states and 224 transitions. Second operand has 61 states, 61 states have (on average 3.7049180327868854) internal successors, (226), 60 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:54,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:08:54,419 INFO L93 Difference]: Finished difference Result 234 states and 235 transitions. [2021-11-21 01:08:54,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2021-11-21 01:08:54,419 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 3.7049180327868854) internal successors, (226), 60 states have internal predecessors, (226), 0 states have call successors, (0), 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 222 [2021-11-21 01:08:54,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:08:54,420 INFO L225 Difference]: With dead ends: 234 [2021-11-21 01:08:54,420 INFO L226 Difference]: Without dead ends: 232 [2021-11-21 01:08:54,421 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 833 GetRequests, 710 SyntacticMatches, 2 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3860 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=5105, Invalid=9901, Unknown=0, NotChecked=0, Total=15006 [2021-11-21 01:08:54,421 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 121 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 597 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 767 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 597 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:08:54,421 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 16 Invalid, 767 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 597 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:08:54,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-11-21 01:08:54,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 226. [2021-11-21 01:08:54,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 225 states have (on average 1.008888888888889) internal successors, (227), 225 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:54,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 227 transitions. [2021-11-21 01:08:54,474 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 227 transitions. Word has length 222 [2021-11-21 01:08:54,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:08:54,475 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 227 transitions. [2021-11-21 01:08:54,475 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 3.7049180327868854) internal successors, (226), 60 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:08:54,475 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 227 transitions. [2021-11-21 01:08:54,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2021-11-21 01:08:54,476 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:08:54,476 INFO L514 BasicCegarLoop]: trace histogram [56, 55, 55, 55, 1, 1, 1, 1] [2021-11-21 01:08:54,517 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Ended with exit code 0 [2021-11-21 01:08:54,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable109,110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:08:54,689 INFO L402 AbstractCegarLoop]: === Iteration 111 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:08:54,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:08:54,690 INFO L85 PathProgramCache]: Analyzing trace with hash 1506696143, now seen corresponding path program 109 times [2021-11-21 01:08:54,690 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:08:54,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686632457] [2021-11-21 01:08:54,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:08:54,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:08:54,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:08:58,065 INFO L134 CoverageAnalysis]: Checked inductivity of 6105 backedges. 4565 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:58,065 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:08:58,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686632457] [2021-11-21 01:08:58,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686632457] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:08:58,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [86143697] [2021-11-21 01:08:58,066 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:08:58,066 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:08:58,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:08:58,066 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:08:58,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Waiting until timeout for monitored process [2021-11-21 01:08:58,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:08:58,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 863 conjuncts, 114 conjunts are in the unsatisfiable core [2021-11-21 01:08:58,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:08:58,723 INFO L134 CoverageAnalysis]: Checked inductivity of 6105 backedges. 4565 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:58,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:08:59,198 INFO L134 CoverageAnalysis]: Checked inductivity of 6105 backedges. 4565 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:08:59,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [86143697] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:08:59,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1832160537] [2021-11-21 01:08:59,199 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:08:59,199 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:08:59,200 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:08:59,200 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:08:59,200 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:08:59,925 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:09:00,398 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:09:00,398 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:09:00,398 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [113, 113, 113] total 114 [2021-11-21 01:09:00,398 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611228313] [2021-11-21 01:09:00,398 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:09:00,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2021-11-21 01:09:00,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:09:00,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2021-11-21 01:09:00,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3379, Invalid=10901, Unknown=0, NotChecked=0, Total=14280 [2021-11-21 01:09:00,401 INFO L87 Difference]: Start difference. First operand 226 states and 227 transitions. Second operand has 115 states, 115 states have (on average 1.9739130434782608) internal successors, (227), 114 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:03,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:09:03,199 INFO L93 Difference]: Finished difference Result 398 states and 400 transitions. [2021-11-21 01:09:03,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2021-11-21 01:09:03,199 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 115 states have (on average 1.9739130434782608) internal successors, (227), 114 states have internal predecessors, (227), 0 states have call successors, (0), 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 225 [2021-11-21 01:09:03,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:09:03,200 INFO L225 Difference]: With dead ends: 398 [2021-11-21 01:09:03,200 INFO L226 Difference]: Without dead ends: 227 [2021-11-21 01:09:03,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 842 GetRequests, 668 SyntacticMatches, 0 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5458 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=6683, Invalid=24117, Unknown=0, NotChecked=0, Total=30800 [2021-11-21 01:09:03,202 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 3 mSDsluCounter, 331 mSDsCounter, 0 mSdLazyCounter, 807 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 388 SdHoareTripleChecker+Invalid, 813 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 807 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:09:03,202 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 388 Invalid, 813 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 807 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:09:03,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-11-21 01:09:03,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 227. [2021-11-21 01:09:03,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 226 states have (on average 1.008849557522124) internal successors, (228), 226 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:03,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 228 transitions. [2021-11-21 01:09:03,248 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 228 transitions. Word has length 225 [2021-11-21 01:09:03,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:09:03,248 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 228 transitions. [2021-11-21 01:09:03,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 115 states have (on average 1.9739130434782608) internal successors, (227), 114 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:03,249 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 228 transitions. [2021-11-21 01:09:03,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2021-11-21 01:09:03,249 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:09:03,250 INFO L514 BasicCegarLoop]: trace histogram [56, 56, 55, 55, 1, 1, 1, 1] [2021-11-21 01:09:03,275 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Forceful destruction successful, exit code 0 [2021-11-21 01:09:03,450 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:09:03,450 INFO L402 AbstractCegarLoop]: === Iteration 112 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:09:03,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:09:03,450 INFO L85 PathProgramCache]: Analyzing trace with hash 1705123974, now seen corresponding path program 110 times [2021-11-21 01:09:03,451 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:09:03,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [288383234] [2021-11-21 01:09:03,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:09:03,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:09:03,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:09:04,854 INFO L134 CoverageAnalysis]: Checked inductivity of 6161 backedges. 1540 proven. 4621 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:04,854 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:09:04,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [288383234] [2021-11-21 01:09:04,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [288383234] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:09:04,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231174387] [2021-11-21 01:09:04,855 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:09:04,855 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:09:04,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:09:04,855 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:09:04,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Waiting until timeout for monitored process [2021-11-21 01:09:05,153 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 56 check-sat command(s) [2021-11-21 01:09:05,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:09:05,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 868 conjuncts, 115 conjunts are in the unsatisfiable core [2021-11-21 01:09:05,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:09:05,636 INFO L134 CoverageAnalysis]: Checked inductivity of 6161 backedges. 1596 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:05,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:09:06,084 INFO L134 CoverageAnalysis]: Checked inductivity of 6161 backedges. 1596 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:06,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231174387] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:09:06,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [833686540] [2021-11-21 01:09:06,085 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:09:06,085 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:09:06,085 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:09:06,085 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:09:06,085 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:09:06,782 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:09:07,125 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:09:07,125 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:09:07,126 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 61 [2021-11-21 01:09:07,126 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1066558090] [2021-11-21 01:09:07,126 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:09:07,126 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-21 01:09:07,126 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:09:07,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-21 01:09:07,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1740, Invalid=2682, Unknown=0, NotChecked=0, Total=4422 [2021-11-21 01:09:07,127 INFO L87 Difference]: Start difference. First operand 227 states and 228 transitions. Second operand has 62 states, 62 states have (on average 3.7096774193548385) internal successors, (230), 61 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:08,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:09:08,621 INFO L93 Difference]: Finished difference Result 238 states and 239 transitions. [2021-11-21 01:09:08,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2021-11-21 01:09:08,622 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 3.7096774193548385) internal successors, (230), 61 states have internal predecessors, (230), 0 states have call successors, (0), 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 226 [2021-11-21 01:09:08,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:09:08,623 INFO L225 Difference]: With dead ends: 238 [2021-11-21 01:09:08,623 INFO L226 Difference]: Without dead ends: 236 [2021-11-21 01:09:08,624 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 723 SyntacticMatches, 2 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3986 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=5281, Invalid=10219, Unknown=0, NotChecked=0, Total=15500 [2021-11-21 01:09:08,624 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 179 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 547 mSolverCounterSat, 229 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 229 IncrementalHoareTripleChecker+Valid, 547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:09:08,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [179 Valid, 17 Invalid, 776 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [229 Valid, 547 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:09:08,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-11-21 01:09:08,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 230. [2021-11-21 01:09:08,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 229 states have (on average 1.0087336244541485) internal successors, (231), 229 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:08,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 231 transitions. [2021-11-21 01:09:08,670 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 231 transitions. Word has length 226 [2021-11-21 01:09:08,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:09:08,670 INFO L470 AbstractCegarLoop]: Abstraction has 230 states and 231 transitions. [2021-11-21 01:09:08,671 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 3.7096774193548385) internal successors, (230), 61 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:08,671 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 231 transitions. [2021-11-21 01:09:08,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2021-11-21 01:09:08,671 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:09:08,672 INFO L514 BasicCegarLoop]: trace histogram [57, 56, 56, 56, 1, 1, 1, 1] [2021-11-21 01:09:08,698 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Forceful destruction successful, exit code 0 [2021-11-21 01:09:08,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable111 [2021-11-21 01:09:08,872 INFO L402 AbstractCegarLoop]: === Iteration 113 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:09:08,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:09:08,873 INFO L85 PathProgramCache]: Analyzing trace with hash 774919923, now seen corresponding path program 111 times [2021-11-21 01:09:08,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:09:08,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [162708893] [2021-11-21 01:09:08,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:09:08,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:09:08,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:09:12,803 INFO L134 CoverageAnalysis]: Checked inductivity of 6328 backedges. 4732 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:12,803 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:09:12,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [162708893] [2021-11-21 01:09:12,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [162708893] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:09:12,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [84600689] [2021-11-21 01:09:12,803 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:09:12,803 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:09:12,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:09:12,804 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:09:12,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Waiting until timeout for monitored process [2021-11-21 01:09:12,972 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:09:12,972 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:09:12,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 878 conjuncts, 116 conjunts are in the unsatisfiable core [2021-11-21 01:09:12,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:09:13,516 INFO L134 CoverageAnalysis]: Checked inductivity of 6328 backedges. 4732 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:13,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:09:14,036 INFO L134 CoverageAnalysis]: Checked inductivity of 6328 backedges. 4732 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:14,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [84600689] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:09:14,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [758564147] [2021-11-21 01:09:14,037 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:09:14,037 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:09:14,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:09:14,037 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:09:14,037 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:09:14,751 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:09:15,234 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:09:15,234 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:09:15,235 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [115, 115, 115] total 116 [2021-11-21 01:09:15,235 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341044201] [2021-11-21 01:09:15,235 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:09:15,235 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2021-11-21 01:09:15,236 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:09:15,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2021-11-21 01:09:15,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3496, Invalid=11266, Unknown=0, NotChecked=0, Total=14762 [2021-11-21 01:09:15,238 INFO L87 Difference]: Start difference. First operand 230 states and 231 transitions. Second operand has 117 states, 117 states have (on average 1.9743589743589745) internal successors, (231), 116 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:18,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:09:18,119 INFO L93 Difference]: Finished difference Result 405 states and 407 transitions. [2021-11-21 01:09:18,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2021-11-21 01:09:18,119 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 1.9743589743589745) internal successors, (231), 116 states have internal predecessors, (231), 0 states have call successors, (0), 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 229 [2021-11-21 01:09:18,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:09:18,120 INFO L225 Difference]: With dead ends: 405 [2021-11-21 01:09:18,120 INFO L226 Difference]: Without dead ends: 231 [2021-11-21 01:09:18,122 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 857 GetRequests, 680 SyntacticMatches, 0 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5641 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=6916, Invalid=24946, Unknown=0, NotChecked=0, Total=31862 [2021-11-21 01:09:18,122 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 3 mSDsluCounter, 500 mSDsCounter, 0 mSdLazyCounter, 1139 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 558 SdHoareTripleChecker+Invalid, 1145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:09:18,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 558 Invalid, 1145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 1139 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:09:18,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-11-21 01:09:18,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 231. [2021-11-21 01:09:18,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 230 states have (on average 1.008695652173913) internal successors, (232), 230 states have internal predecessors, (232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:18,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 232 transitions. [2021-11-21 01:09:18,176 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 232 transitions. Word has length 229 [2021-11-21 01:09:18,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:09:18,177 INFO L470 AbstractCegarLoop]: Abstraction has 231 states and 232 transitions. [2021-11-21 01:09:18,177 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 117 states, 117 states have (on average 1.9743589743589745) internal successors, (231), 116 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:18,177 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 232 transitions. [2021-11-21 01:09:18,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2021-11-21 01:09:18,178 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:09:18,178 INFO L514 BasicCegarLoop]: trace histogram [57, 57, 56, 56, 1, 1, 1, 1] [2021-11-21 01:09:18,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Forceful destruction successful, exit code 0 [2021-11-21 01:09:18,378 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable112 [2021-11-21 01:09:18,378 INFO L402 AbstractCegarLoop]: === Iteration 114 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:09:18,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:09:18,379 INFO L85 PathProgramCache]: Analyzing trace with hash -325785558, now seen corresponding path program 112 times [2021-11-21 01:09:18,379 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:09:18,379 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1735702475] [2021-11-21 01:09:18,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:09:18,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:09:18,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:09:20,013 INFO L134 CoverageAnalysis]: Checked inductivity of 6385 backedges. 1596 proven. 4789 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:20,013 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:09:20,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1735702475] [2021-11-21 01:09:20,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1735702475] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:09:20,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1569605346] [2021-11-21 01:09:20,015 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:09:20,015 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:09:20,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:09:20,029 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:09:20,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Waiting until timeout for monitored process [2021-11-21 01:09:20,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:09:20,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 883 conjuncts, 117 conjunts are in the unsatisfiable core [2021-11-21 01:09:20,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:09:20,752 INFO L134 CoverageAnalysis]: Checked inductivity of 6385 backedges. 1653 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:20,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:09:21,317 INFO L134 CoverageAnalysis]: Checked inductivity of 6385 backedges. 1653 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:21,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1569605346] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:09:21,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1870125189] [2021-11-21 01:09:21,319 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:09:21,319 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:09:21,319 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:09:21,319 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:09:21,319 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:09:22,089 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:09:22,390 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:09:22,390 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:09:22,390 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 62 [2021-11-21 01:09:22,390 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962678696] [2021-11-21 01:09:22,390 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:09:22,391 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-21 01:09:22,391 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:09:22,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-21 01:09:22,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1799, Invalid=2757, Unknown=0, NotChecked=0, Total=4556 [2021-11-21 01:09:22,392 INFO L87 Difference]: Start difference. First operand 231 states and 232 transitions. Second operand has 63 states, 63 states have (on average 3.7142857142857144) internal successors, (234), 62 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:23,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:09:23,971 INFO L93 Difference]: Finished difference Result 242 states and 243 transitions. [2021-11-21 01:09:23,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2021-11-21 01:09:23,972 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 3.7142857142857144) internal successors, (234), 62 states have internal predecessors, (234), 0 states have call successors, (0), 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 230 [2021-11-21 01:09:23,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:09:23,973 INFO L225 Difference]: With dead ends: 242 [2021-11-21 01:09:23,973 INFO L226 Difference]: Without dead ends: 240 [2021-11-21 01:09:23,974 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 863 GetRequests, 736 SyntacticMatches, 2 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4114 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=5460, Invalid=10542, Unknown=0, NotChecked=0, Total=16002 [2021-11-21 01:09:23,975 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 181 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 638 mSolverCounterSat, 232 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 870 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 232 IncrementalHoareTripleChecker+Valid, 638 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:09:23,975 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [181 Valid, 20 Invalid, 870 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [232 Valid, 638 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:09:23,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2021-11-21 01:09:24,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 234. [2021-11-21 01:09:24,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 233 states have (on average 1.0085836909871244) internal successors, (235), 233 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:24,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 235 transitions. [2021-11-21 01:09:24,026 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 235 transitions. Word has length 230 [2021-11-21 01:09:24,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:09:24,026 INFO L470 AbstractCegarLoop]: Abstraction has 234 states and 235 transitions. [2021-11-21 01:09:24,026 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 3.7142857142857144) internal successors, (234), 62 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:24,026 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 235 transitions. [2021-11-21 01:09:24,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2021-11-21 01:09:24,027 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:09:24,027 INFO L514 BasicCegarLoop]: trace histogram [58, 57, 57, 57, 1, 1, 1, 1] [2021-11-21 01:09:24,054 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Ended with exit code 0 [2021-11-21 01:09:24,227 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable113,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:09:24,228 INFO L402 AbstractCegarLoop]: === Iteration 115 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:09:24,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:09:24,228 INFO L85 PathProgramCache]: Analyzing trace with hash 1153350863, now seen corresponding path program 113 times [2021-11-21 01:09:24,228 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:09:24,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [440629261] [2021-11-21 01:09:24,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:09:24,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:09:24,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:09:28,394 INFO L134 CoverageAnalysis]: Checked inductivity of 6555 backedges. 4902 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:28,394 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:09:28,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [440629261] [2021-11-21 01:09:28,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [440629261] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:09:28,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1625845699] [2021-11-21 01:09:28,394 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:09:28,395 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:09:28,395 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:09:28,395 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:09:28,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2021-11-21 01:09:28,763 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 58 check-sat command(s) [2021-11-21 01:09:28,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:09:28,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 893 conjuncts, 118 conjunts are in the unsatisfiable core [2021-11-21 01:09:28,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:09:29,341 INFO L134 CoverageAnalysis]: Checked inductivity of 6555 backedges. 4902 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:29,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:09:29,895 INFO L134 CoverageAnalysis]: Checked inductivity of 6555 backedges. 4902 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:29,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1625845699] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:09:29,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [923087305] [2021-11-21 01:09:29,896 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:09:29,896 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:09:29,897 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:09:29,897 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:09:29,897 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:09:30,654 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:09:31,172 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:09:31,173 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:09:31,173 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 117, 117] total 118 [2021-11-21 01:09:31,173 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874224059] [2021-11-21 01:09:31,173 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:09:31,174 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2021-11-21 01:09:31,174 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:09:31,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2021-11-21 01:09:31,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3615, Invalid=11637, Unknown=0, NotChecked=0, Total=15252 [2021-11-21 01:09:31,176 INFO L87 Difference]: Start difference. First operand 234 states and 235 transitions. Second operand has 119 states, 119 states have (on average 1.9747899159663866) internal successors, (235), 118 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:34,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:09:34,302 INFO L93 Difference]: Finished difference Result 412 states and 414 transitions. [2021-11-21 01:09:34,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2021-11-21 01:09:34,302 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 1.9747899159663866) internal successors, (235), 118 states have internal predecessors, (235), 0 states have call successors, (0), 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 233 [2021-11-21 01:09:34,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:09:34,303 INFO L225 Difference]: With dead ends: 412 [2021-11-21 01:09:34,303 INFO L226 Difference]: Without dead ends: 235 [2021-11-21 01:09:34,306 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 872 GetRequests, 692 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5827 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=7153, Invalid=25789, Unknown=0, NotChecked=0, Total=32942 [2021-11-21 01:09:34,306 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 3 mSDsluCounter, 466 mSDsCounter, 0 mSdLazyCounter, 1091 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 525 SdHoareTripleChecker+Invalid, 1097 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1091 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:09:34,307 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 525 Invalid, 1097 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 1091 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:09:34,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2021-11-21 01:09:34,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 235. [2021-11-21 01:09:34,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 234 states have (on average 1.0085470085470085) internal successors, (236), 234 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:34,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 236 transitions. [2021-11-21 01:09:34,360 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 236 transitions. Word has length 233 [2021-11-21 01:09:34,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:09:34,360 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 236 transitions. [2021-11-21 01:09:34,360 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 1.9747899159663866) internal successors, (235), 118 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:34,360 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 236 transitions. [2021-11-21 01:09:34,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2021-11-21 01:09:34,375 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:09:34,375 INFO L514 BasicCegarLoop]: trace histogram [58, 58, 57, 57, 1, 1, 1, 1] [2021-11-21 01:09:34,403 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Ended with exit code 0 [2021-11-21 01:09:34,576 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable114 [2021-11-21 01:09:34,576 INFO L402 AbstractCegarLoop]: === Iteration 116 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:09:34,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:09:34,576 INFO L85 PathProgramCache]: Analyzing trace with hash 796514950, now seen corresponding path program 114 times [2021-11-21 01:09:34,576 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:09:34,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1861364184] [2021-11-21 01:09:34,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:09:34,577 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:09:34,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:09:36,321 INFO L134 CoverageAnalysis]: Checked inductivity of 6613 backedges. 1653 proven. 4960 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:36,321 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:09:36,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1861364184] [2021-11-21 01:09:36,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1861364184] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:09:36,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [772475548] [2021-11-21 01:09:36,322 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:09:36,322 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:09:36,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:09:36,323 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:09:36,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Waiting until timeout for monitored process [2021-11-21 01:09:36,485 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:09:36,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:09:36,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 898 conjuncts, 119 conjunts are in the unsatisfiable core [2021-11-21 01:09:36,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:09:37,096 INFO L134 CoverageAnalysis]: Checked inductivity of 6613 backedges. 1711 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:37,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:09:37,687 INFO L134 CoverageAnalysis]: Checked inductivity of 6613 backedges. 1711 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:37,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [772475548] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:09:37,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1918194477] [2021-11-21 01:09:37,689 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:09:37,689 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:09:37,689 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:09:37,689 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:09:37,689 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:09:38,415 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:09:38,776 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:09:38,776 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:09:38,776 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 63 [2021-11-21 01:09:38,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805412240] [2021-11-21 01:09:38,777 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:09:38,777 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-21 01:09:38,777 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:09:38,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-21 01:09:38,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1859, Invalid=2833, Unknown=0, NotChecked=0, Total=4692 [2021-11-21 01:09:38,778 INFO L87 Difference]: Start difference. First operand 235 states and 236 transitions. Second operand has 64 states, 64 states have (on average 3.71875) internal successors, (238), 63 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:40,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:09:40,530 INFO L93 Difference]: Finished difference Result 246 states and 247 transitions. [2021-11-21 01:09:40,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2021-11-21 01:09:40,530 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 3.71875) internal successors, (238), 63 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 234 [2021-11-21 01:09:40,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:09:40,531 INFO L225 Difference]: With dead ends: 246 [2021-11-21 01:09:40,531 INFO L226 Difference]: Without dead ends: 244 [2021-11-21 01:09:40,532 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 878 GetRequests, 749 SyntacticMatches, 2 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4244 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=5642, Invalid=10870, Unknown=0, NotChecked=0, Total=16512 [2021-11-21 01:09:40,533 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 127 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 639 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 818 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 639 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:09:40,533 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 16 Invalid, 818 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 639 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:09:40,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-11-21 01:09:40,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 238. [2021-11-21 01:09:40,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 237 states have (on average 1.0084388185654007) internal successors, (239), 237 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:40,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 239 transitions. [2021-11-21 01:09:40,587 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 239 transitions. Word has length 234 [2021-11-21 01:09:40,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:09:40,587 INFO L470 AbstractCegarLoop]: Abstraction has 238 states and 239 transitions. [2021-11-21 01:09:40,588 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 3.71875) internal successors, (238), 63 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:40,588 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 239 transitions. [2021-11-21 01:09:40,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2021-11-21 01:09:40,588 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:09:40,589 INFO L514 BasicCegarLoop]: trace histogram [59, 58, 58, 58, 1, 1, 1, 1] [2021-11-21 01:09:40,617 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Forceful destruction successful, exit code 0 [2021-11-21 01:09:40,789 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable115,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:09:40,789 INFO L402 AbstractCegarLoop]: === Iteration 117 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:09:40,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:09:40,790 INFO L85 PathProgramCache]: Analyzing trace with hash -712614669, now seen corresponding path program 115 times [2021-11-21 01:09:40,790 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:09:40,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1830506476] [2021-11-21 01:09:40,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:09:40,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:09:40,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:09:44,961 INFO L134 CoverageAnalysis]: Checked inductivity of 6786 backedges. 5075 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:44,961 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:09:44,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1830506476] [2021-11-21 01:09:44,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1830506476] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:09:44,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1553375377] [2021-11-21 01:09:44,961 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:09:44,965 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:09:44,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:09:44,966 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:09:44,973 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Waiting until timeout for monitored process [2021-11-21 01:09:45,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:09:45,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 908 conjuncts, 120 conjunts are in the unsatisfiable core [2021-11-21 01:09:45,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:09:45,605 INFO L134 CoverageAnalysis]: Checked inductivity of 6786 backedges. 5075 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:45,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:09:46,037 INFO L134 CoverageAnalysis]: Checked inductivity of 6786 backedges. 5075 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:46,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1553375377] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:09:46,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1744491843] [2021-11-21 01:09:46,038 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:09:46,038 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:09:46,038 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:09:46,039 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:09:46,039 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:09:46,665 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:09:47,143 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:09:47,143 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:09:47,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [119, 119, 119] total 120 [2021-11-21 01:09:47,144 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756348307] [2021-11-21 01:09:47,144 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:09:47,144 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2021-11-21 01:09:47,144 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:09:47,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2021-11-21 01:09:47,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3736, Invalid=12014, Unknown=0, NotChecked=0, Total=15750 [2021-11-21 01:09:47,145 INFO L87 Difference]: Start difference. First operand 238 states and 239 transitions. Second operand has 121 states, 121 states have (on average 1.975206611570248) internal successors, (239), 120 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:49,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:09:49,943 INFO L93 Difference]: Finished difference Result 419 states and 421 transitions. [2021-11-21 01:09:49,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2021-11-21 01:09:49,943 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 1.975206611570248) internal successors, (239), 120 states have internal predecessors, (239), 0 states have call successors, (0), 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 237 [2021-11-21 01:09:49,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:09:49,944 INFO L225 Difference]: With dead ends: 419 [2021-11-21 01:09:49,944 INFO L226 Difference]: Without dead ends: 239 [2021-11-21 01:09:49,947 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 887 GetRequests, 704 SyntacticMatches, 0 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6016 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=7394, Invalid=26646, Unknown=0, NotChecked=0, Total=34040 [2021-11-21 01:09:49,948 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 3 mSDsluCounter, 362 mSDsCounter, 0 mSdLazyCounter, 879 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 422 SdHoareTripleChecker+Invalid, 886 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 879 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:09:49,948 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 422 Invalid, 886 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 879 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:09:49,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2021-11-21 01:09:50,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2021-11-21 01:09:50,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 238 states have (on average 1.0084033613445378) internal successors, (240), 238 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:50,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 240 transitions. [2021-11-21 01:09:50,016 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 240 transitions. Word has length 237 [2021-11-21 01:09:50,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:09:50,016 INFO L470 AbstractCegarLoop]: Abstraction has 239 states and 240 transitions. [2021-11-21 01:09:50,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 1.975206611570248) internal successors, (239), 120 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:50,016 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 240 transitions. [2021-11-21 01:09:50,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2021-11-21 01:09:50,017 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:09:50,017 INFO L514 BasicCegarLoop]: trace histogram [59, 59, 58, 58, 1, 1, 1, 1] [2021-11-21 01:09:50,046 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Forceful destruction successful, exit code 0 [2021-11-21 01:09:50,218 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable116,117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:09:50,218 INFO L402 AbstractCegarLoop]: === Iteration 118 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:09:50,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:09:50,218 INFO L85 PathProgramCache]: Analyzing trace with hash -1921136854, now seen corresponding path program 116 times [2021-11-21 01:09:50,218 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:09:50,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530270892] [2021-11-21 01:09:50,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:09:50,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:09:50,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:09:51,685 INFO L134 CoverageAnalysis]: Checked inductivity of 6845 backedges. 1711 proven. 5134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:51,685 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:09:51,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530270892] [2021-11-21 01:09:51,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1530270892] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:09:51,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [528643418] [2021-11-21 01:09:51,686 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:09:51,686 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:09:51,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:09:51,691 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:09:51,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Waiting until timeout for monitored process [2021-11-21 01:09:52,052 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2021-11-21 01:09:52,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:09:52,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 913 conjuncts, 121 conjunts are in the unsatisfiable core [2021-11-21 01:09:52,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:09:52,553 INFO L134 CoverageAnalysis]: Checked inductivity of 6845 backedges. 1770 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:52,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:09:53,093 INFO L134 CoverageAnalysis]: Checked inductivity of 6845 backedges. 1770 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:09:53,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [528643418] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:09:53,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1429044960] [2021-11-21 01:09:53,094 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:09:53,094 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:09:53,095 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:09:53,095 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:09:53,095 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:09:53,837 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:09:54,179 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:09:54,179 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:09:54,180 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 64 [2021-11-21 01:09:54,180 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328101660] [2021-11-21 01:09:54,180 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:09:54,180 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-21 01:09:54,180 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:09:54,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-21 01:09:54,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1920, Invalid=2910, Unknown=0, NotChecked=0, Total=4830 [2021-11-21 01:09:54,181 INFO L87 Difference]: Start difference. First operand 239 states and 240 transitions. Second operand has 65 states, 65 states have (on average 3.723076923076923) internal successors, (242), 64 states have internal predecessors, (242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:55,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:09:55,908 INFO L93 Difference]: Finished difference Result 250 states and 251 transitions. [2021-11-21 01:09:55,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2021-11-21 01:09:55,908 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.723076923076923) internal successors, (242), 64 states have internal predecessors, (242), 0 states have call successors, (0), 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 238 [2021-11-21 01:09:55,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:09:55,909 INFO L225 Difference]: With dead ends: 250 [2021-11-21 01:09:55,909 INFO L226 Difference]: Without dead ends: 248 [2021-11-21 01:09:55,911 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 893 GetRequests, 762 SyntacticMatches, 2 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4376 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=5827, Invalid=11203, Unknown=0, NotChecked=0, Total=17030 [2021-11-21 01:09:55,911 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 246 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 594 mSolverCounterSat, 299 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 893 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 299 IncrementalHoareTripleChecker+Valid, 594 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:09:55,911 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [246 Valid, 17 Invalid, 893 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [299 Valid, 594 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:09:55,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-11-21 01:09:55,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 242. [2021-11-21 01:09:55,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 241 states have (on average 1.008298755186722) internal successors, (243), 241 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:55,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 243 transitions. [2021-11-21 01:09:55,965 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 243 transitions. Word has length 238 [2021-11-21 01:09:55,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:09:55,965 INFO L470 AbstractCegarLoop]: Abstraction has 242 states and 243 transitions. [2021-11-21 01:09:55,965 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 3.723076923076923) internal successors, (242), 64 states have internal predecessors, (242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:09:55,965 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 243 transitions. [2021-11-21 01:09:55,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2021-11-21 01:09:55,966 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:09:55,966 INFO L514 BasicCegarLoop]: trace histogram [60, 59, 59, 59, 1, 1, 1, 1] [2021-11-21 01:09:55,992 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Ended with exit code 0 [2021-11-21 01:09:56,166 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable117 [2021-11-21 01:09:56,167 INFO L402 AbstractCegarLoop]: === Iteration 119 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:09:56,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:09:56,167 INFO L85 PathProgramCache]: Analyzing trace with hash -2143978033, now seen corresponding path program 117 times [2021-11-21 01:09:56,167 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:09:56,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [547627334] [2021-11-21 01:09:56,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:09:56,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:09:56,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:10:00,535 INFO L134 CoverageAnalysis]: Checked inductivity of 7021 backedges. 5251 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:00,535 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:10:00,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [547627334] [2021-11-21 01:10:00,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [547627334] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:10:00,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [58077272] [2021-11-21 01:10:00,535 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:10:00,535 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:00,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:10:00,536 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:10:00,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Waiting until timeout for monitored process [2021-11-21 01:10:00,722 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:10:00,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:10:00,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 923 conjuncts, 122 conjunts are in the unsatisfiable core [2021-11-21 01:10:00,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:10:01,304 INFO L134 CoverageAnalysis]: Checked inductivity of 7021 backedges. 5251 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:01,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:10:01,873 INFO L134 CoverageAnalysis]: Checked inductivity of 7021 backedges. 5251 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:01,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [58077272] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:10:01,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1456354766] [2021-11-21 01:10:01,874 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:10:01,874 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:10:01,875 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:10:01,875 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:10:01,875 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:10:02,579 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:10:03,084 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:10:03,084 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:10:03,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [121, 121, 121] total 122 [2021-11-21 01:10:03,084 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884532124] [2021-11-21 01:10:03,084 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:10:03,085 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2021-11-21 01:10:03,085 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:10:03,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2021-11-21 01:10:03,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3859, Invalid=12397, Unknown=0, NotChecked=0, Total=16256 [2021-11-21 01:10:03,086 INFO L87 Difference]: Start difference. First operand 242 states and 243 transitions. Second operand has 123 states, 123 states have (on average 1.975609756097561) internal successors, (243), 122 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:06,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:10:06,510 INFO L93 Difference]: Finished difference Result 426 states and 428 transitions. [2021-11-21 01:10:06,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2021-11-21 01:10:06,510 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.975609756097561) internal successors, (243), 122 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 241 [2021-11-21 01:10:06,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:10:06,511 INFO L225 Difference]: With dead ends: 426 [2021-11-21 01:10:06,511 INFO L226 Difference]: Without dead ends: 243 [2021-11-21 01:10:06,513 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 902 GetRequests, 716 SyntacticMatches, 0 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6208 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=7639, Invalid=27517, Unknown=0, NotChecked=0, Total=35156 [2021-11-21 01:10:06,513 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 3 mSDsluCounter, 698 mSDsCounter, 0 mSdLazyCounter, 1536 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 759 SdHoareTripleChecker+Invalid, 1542 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1536 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:10:06,514 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 759 Invalid, 1542 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 1536 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:10:06,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-11-21 01:10:06,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 243. [2021-11-21 01:10:06,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 242 states have (on average 1.0082644628099173) internal successors, (244), 242 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:06,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 244 transitions. [2021-11-21 01:10:06,567 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 244 transitions. Word has length 241 [2021-11-21 01:10:06,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:10:06,568 INFO L470 AbstractCegarLoop]: Abstraction has 243 states and 244 transitions. [2021-11-21 01:10:06,568 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.975609756097561) internal successors, (243), 122 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:06,568 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 244 transitions. [2021-11-21 01:10:06,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2021-11-21 01:10:06,569 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:10:06,569 INFO L514 BasicCegarLoop]: trace histogram [60, 60, 59, 59, 1, 1, 1, 1] [2021-11-21 01:10:06,595 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Ended with exit code 0 [2021-11-21 01:10:06,769 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable118 [2021-11-21 01:10:06,769 INFO L402 AbstractCegarLoop]: === Iteration 120 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:10:06,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:10:06,770 INFO L85 PathProgramCache]: Analyzing trace with hash 1030681734, now seen corresponding path program 118 times [2021-11-21 01:10:06,770 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:10:06,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095015105] [2021-11-21 01:10:06,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:10:06,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:10:06,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:10:08,571 INFO L134 CoverageAnalysis]: Checked inductivity of 7081 backedges. 1770 proven. 5311 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:08,571 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:10:08,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095015105] [2021-11-21 01:10:08,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1095015105] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:10:08,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1802530894] [2021-11-21 01:10:08,572 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:10:08,572 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:08,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:10:08,573 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:10:08,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Waiting until timeout for monitored process [2021-11-21 01:10:08,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:10:08,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 928 conjuncts, 123 conjunts are in the unsatisfiable core [2021-11-21 01:10:08,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:10:09,326 INFO L134 CoverageAnalysis]: Checked inductivity of 7081 backedges. 1830 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:09,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:10:09,914 INFO L134 CoverageAnalysis]: Checked inductivity of 7081 backedges. 1830 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:09,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1802530894] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:10:09,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [743855699] [2021-11-21 01:10:09,915 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:10:09,915 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:10:09,915 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:10:09,915 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:10:09,915 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:10:10,640 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:10:10,973 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:10:10,973 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:10:10,973 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 65 [2021-11-21 01:10:10,974 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597525880] [2021-11-21 01:10:10,974 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:10:10,974 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-21 01:10:10,974 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:10:10,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-21 01:10:10,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1982, Invalid=2988, Unknown=0, NotChecked=0, Total=4970 [2021-11-21 01:10:10,975 INFO L87 Difference]: Start difference. First operand 243 states and 244 transitions. Second operand has 66 states, 66 states have (on average 3.727272727272727) internal successors, (246), 65 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:12,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:10:12,748 INFO L93 Difference]: Finished difference Result 254 states and 255 transitions. [2021-11-21 01:10:12,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2021-11-21 01:10:12,749 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 3.727272727272727) internal successors, (246), 65 states have internal predecessors, (246), 0 states have call successors, (0), 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 242 [2021-11-21 01:10:12,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:10:12,749 INFO L225 Difference]: With dead ends: 254 [2021-11-21 01:10:12,749 INFO L226 Difference]: Without dead ends: 252 [2021-11-21 01:10:12,750 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 908 GetRequests, 775 SyntacticMatches, 2 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4510 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=6015, Invalid=11541, Unknown=0, NotChecked=0, Total=17556 [2021-11-21 01:10:12,751 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 194 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 648 mSolverCounterSat, 244 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 892 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 244 IncrementalHoareTripleChecker+Valid, 648 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:10:12,751 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 20 Invalid, 892 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [244 Valid, 648 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:10:12,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-11-21 01:10:12,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 246. [2021-11-21 01:10:12,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 245 states have (on average 1.0081632653061225) internal successors, (247), 245 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:12,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 247 transitions. [2021-11-21 01:10:12,805 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 247 transitions. Word has length 242 [2021-11-21 01:10:12,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:10:12,805 INFO L470 AbstractCegarLoop]: Abstraction has 246 states and 247 transitions. [2021-11-21 01:10:12,805 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 3.727272727272727) internal successors, (246), 65 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:12,805 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 247 transitions. [2021-11-21 01:10:12,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2021-11-21 01:10:12,806 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:10:12,806 INFO L514 BasicCegarLoop]: trace histogram [61, 60, 60, 60, 1, 1, 1, 1] [2021-11-21 01:10:12,833 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Forceful destruction successful, exit code 0 [2021-11-21 01:10:13,007 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119,120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:13,007 INFO L402 AbstractCegarLoop]: === Iteration 121 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:10:13,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:10:13,007 INFO L85 PathProgramCache]: Analyzing trace with hash 323158771, now seen corresponding path program 119 times [2021-11-21 01:10:13,007 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:10:13,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [676939293] [2021-11-21 01:10:13,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:10:13,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:10:13,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:10:17,405 INFO L134 CoverageAnalysis]: Checked inductivity of 7260 backedges. 5430 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:17,406 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:10:17,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [676939293] [2021-11-21 01:10:17,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [676939293] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:10:17,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1231599974] [2021-11-21 01:10:17,406 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:10:17,406 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:17,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:10:17,407 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:10:17,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Waiting until timeout for monitored process [2021-11-21 01:10:17,763 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 61 check-sat command(s) [2021-11-21 01:10:17,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:10:17,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 938 conjuncts, 124 conjunts are in the unsatisfiable core [2021-11-21 01:10:17,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:10:18,253 INFO L134 CoverageAnalysis]: Checked inductivity of 7260 backedges. 5430 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:18,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:10:18,785 INFO L134 CoverageAnalysis]: Checked inductivity of 7260 backedges. 5430 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:18,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1231599974] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:10:18,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1747290822] [2021-11-21 01:10:18,786 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:10:18,786 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:10:18,786 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:10:18,786 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:10:18,787 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:10:19,499 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:10:20,041 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:10:20,041 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:10:20,041 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [123, 123, 123] total 124 [2021-11-21 01:10:20,042 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977904075] [2021-11-21 01:10:20,042 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:10:20,042 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2021-11-21 01:10:20,042 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:10:20,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2021-11-21 01:10:20,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3984, Invalid=12786, Unknown=0, NotChecked=0, Total=16770 [2021-11-21 01:10:20,044 INFO L87 Difference]: Start difference. First operand 246 states and 247 transitions. Second operand has 125 states, 125 states have (on average 1.976) internal successors, (247), 124 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:23,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:10:23,208 INFO L93 Difference]: Finished difference Result 433 states and 435 transitions. [2021-11-21 01:10:23,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2021-11-21 01:10:23,208 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 125 states have (on average 1.976) internal successors, (247), 124 states have internal predecessors, (247), 0 states have call successors, (0), 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 245 [2021-11-21 01:10:23,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:10:23,209 INFO L225 Difference]: With dead ends: 433 [2021-11-21 01:10:23,209 INFO L226 Difference]: Without dead ends: 247 [2021-11-21 01:10:23,211 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 917 GetRequests, 728 SyntacticMatches, 0 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6403 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=7888, Invalid=28402, Unknown=0, NotChecked=0, Total=36290 [2021-11-21 01:10:23,211 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 3 mSDsluCounter, 327 mSDsCounter, 0 mSdLazyCounter, 815 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 389 SdHoareTripleChecker+Invalid, 821 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 815 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:10:23,211 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 389 Invalid, 821 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 815 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:10:23,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-11-21 01:10:23,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 247. [2021-11-21 01:10:23,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 246 states have (on average 1.008130081300813) internal successors, (248), 246 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:23,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 248 transitions. [2021-11-21 01:10:23,267 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 248 transitions. Word has length 245 [2021-11-21 01:10:23,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:10:23,267 INFO L470 AbstractCegarLoop]: Abstraction has 247 states and 248 transitions. [2021-11-21 01:10:23,267 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 125 states have (on average 1.976) internal successors, (247), 124 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:23,267 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 248 transitions. [2021-11-21 01:10:23,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2021-11-21 01:10:23,268 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:10:23,268 INFO L514 BasicCegarLoop]: trace histogram [61, 61, 60, 60, 1, 1, 1, 1] [2021-11-21 01:10:23,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Forceful destruction successful, exit code 0 [2021-11-21 01:10:23,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable120,121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:23,469 INFO L402 AbstractCegarLoop]: === Iteration 122 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:10:23,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:10:23,469 INFO L85 PathProgramCache]: Analyzing trace with hash 350504490, now seen corresponding path program 120 times [2021-11-21 01:10:23,469 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:10:23,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41816284] [2021-11-21 01:10:23,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:10:23,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:10:23,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:10:25,282 INFO L134 CoverageAnalysis]: Checked inductivity of 7321 backedges. 1830 proven. 5491 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:25,282 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:10:25,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41816284] [2021-11-21 01:10:25,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [41816284] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:10:25,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [34380115] [2021-11-21 01:10:25,283 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:10:25,283 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:25,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:10:25,306 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:10:25,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Waiting until timeout for monitored process [2021-11-21 01:10:25,499 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:10:25,500 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:10:25,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 943 conjuncts, 125 conjunts are in the unsatisfiable core [2021-11-21 01:10:25,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:10:26,123 INFO L134 CoverageAnalysis]: Checked inductivity of 7321 backedges. 1891 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:26,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:10:26,657 INFO L134 CoverageAnalysis]: Checked inductivity of 7321 backedges. 1891 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:26,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [34380115] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:10:26,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [215790707] [2021-11-21 01:10:26,657 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:10:26,657 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:10:26,658 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:10:26,658 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:10:26,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:10:27,360 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:10:27,712 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:10:27,712 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:10:27,712 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 66 [2021-11-21 01:10:27,713 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374051769] [2021-11-21 01:10:27,713 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:10:27,713 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-21 01:10:27,713 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:10:27,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-21 01:10:27,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2045, Invalid=3067, Unknown=0, NotChecked=0, Total=5112 [2021-11-21 01:10:27,714 INFO L87 Difference]: Start difference. First operand 247 states and 248 transitions. Second operand has 67 states, 67 states have (on average 3.7313432835820897) internal successors, (250), 66 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:29,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:10:29,540 INFO L93 Difference]: Finished difference Result 258 states and 259 transitions. [2021-11-21 01:10:29,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 129 states. [2021-11-21 01:10:29,540 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 3.7313432835820897) internal successors, (250), 66 states have internal predecessors, (250), 0 states have call successors, (0), 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 246 [2021-11-21 01:10:29,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:10:29,541 INFO L225 Difference]: With dead ends: 258 [2021-11-21 01:10:29,541 INFO L226 Difference]: Without dead ends: 256 [2021-11-21 01:10:29,542 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 923 GetRequests, 788 SyntacticMatches, 2 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4646 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=6206, Invalid=11884, Unknown=0, NotChecked=0, Total=18090 [2021-11-21 01:10:29,543 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 255 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 577 mSolverCounterSat, 309 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 255 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 886 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 309 IncrementalHoareTripleChecker+Valid, 577 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:10:29,543 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [255 Valid, 19 Invalid, 886 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [309 Valid, 577 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:10:29,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-11-21 01:10:29,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 250. [2021-11-21 01:10:29,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 249 states have (on average 1.0080321285140563) internal successors, (251), 249 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:29,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 251 transitions. [2021-11-21 01:10:29,600 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 251 transitions. Word has length 246 [2021-11-21 01:10:29,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:10:29,601 INFO L470 AbstractCegarLoop]: Abstraction has 250 states and 251 transitions. [2021-11-21 01:10:29,601 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 3.7313432835820897) internal successors, (250), 66 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:29,601 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 251 transitions. [2021-11-21 01:10:29,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2021-11-21 01:10:29,602 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:10:29,602 INFO L514 BasicCegarLoop]: trace histogram [62, 61, 61, 61, 1, 1, 1, 1] [2021-11-21 01:10:29,629 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Ended with exit code 0 [2021-11-21 01:10:29,802 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable121,122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:29,803 INFO L402 AbstractCegarLoop]: === Iteration 123 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:10:29,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:10:29,803 INFO L85 PathProgramCache]: Analyzing trace with hash 818585295, now seen corresponding path program 121 times [2021-11-21 01:10:29,803 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:10:29,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427892154] [2021-11-21 01:10:29,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:10:29,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:10:29,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:10:34,485 INFO L134 CoverageAnalysis]: Checked inductivity of 7503 backedges. 5612 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:34,486 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:10:34,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427892154] [2021-11-21 01:10:34,486 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [427892154] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:10:34,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [449121056] [2021-11-21 01:10:34,486 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:10:34,486 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:34,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:10:34,487 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:10:34,488 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Waiting until timeout for monitored process [2021-11-21 01:10:34,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:10:34,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 953 conjuncts, 126 conjunts are in the unsatisfiable core [2021-11-21 01:10:34,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:10:35,239 INFO L134 CoverageAnalysis]: Checked inductivity of 7503 backedges. 5612 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:35,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:10:35,819 INFO L134 CoverageAnalysis]: Checked inductivity of 7503 backedges. 5612 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:35,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [449121056] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:10:35,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [92886129] [2021-11-21 01:10:35,821 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:10:35,821 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:10:35,821 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:10:35,821 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:10:35,822 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:10:36,540 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:10:37,071 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:10:37,071 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:10:37,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [125, 125, 125] total 126 [2021-11-21 01:10:37,072 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049034606] [2021-11-21 01:10:37,072 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:10:37,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2021-11-21 01:10:37,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:10:37,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2021-11-21 01:10:37,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4111, Invalid=13181, Unknown=0, NotChecked=0, Total=17292 [2021-11-21 01:10:37,074 INFO L87 Difference]: Start difference. First operand 250 states and 251 transitions. Second operand has 127 states, 127 states have (on average 1.9763779527559056) internal successors, (251), 126 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:40,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:10:40,391 INFO L93 Difference]: Finished difference Result 440 states and 442 transitions. [2021-11-21 01:10:40,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2021-11-21 01:10:40,391 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 127 states have (on average 1.9763779527559056) internal successors, (251), 126 states have internal predecessors, (251), 0 states have call successors, (0), 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 249 [2021-11-21 01:10:40,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:10:40,392 INFO L225 Difference]: With dead ends: 440 [2021-11-21 01:10:40,392 INFO L226 Difference]: Without dead ends: 251 [2021-11-21 01:10:40,394 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 932 GetRequests, 740 SyntacticMatches, 0 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6601 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=8141, Invalid=29301, Unknown=0, NotChecked=0, Total=37442 [2021-11-21 01:10:40,395 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 3 mSDsluCounter, 366 mSDsCounter, 0 mSdLazyCounter, 899 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 429 SdHoareTripleChecker+Invalid, 907 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 899 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:10:40,395 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 429 Invalid, 907 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 899 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:10:40,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2021-11-21 01:10:40,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 251. [2021-11-21 01:10:40,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 250 states have (on average 1.008) internal successors, (252), 250 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:40,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 252 transitions. [2021-11-21 01:10:40,449 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 252 transitions. Word has length 249 [2021-11-21 01:10:40,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:10:40,450 INFO L470 AbstractCegarLoop]: Abstraction has 251 states and 252 transitions. [2021-11-21 01:10:40,450 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 127 states have (on average 1.9763779527559056) internal successors, (251), 126 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:40,450 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 252 transitions. [2021-11-21 01:10:40,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2021-11-21 01:10:40,451 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:10:40,451 INFO L514 BasicCegarLoop]: trace histogram [62, 62, 61, 61, 1, 1, 1, 1] [2021-11-21 01:10:40,473 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Forceful destruction successful, exit code 0 [2021-11-21 01:10:40,651 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable122 [2021-11-21 01:10:40,651 INFO L402 AbstractCegarLoop]: === Iteration 124 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:10:40,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:10:40,652 INFO L85 PathProgramCache]: Analyzing trace with hash 756641414, now seen corresponding path program 122 times [2021-11-21 01:10:40,652 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:10:40,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133832428] [2021-11-21 01:10:40,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:10:40,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:10:40,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:10:42,530 INFO L134 CoverageAnalysis]: Checked inductivity of 7565 backedges. 1891 proven. 5674 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:42,530 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:10:42,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133832428] [2021-11-21 01:10:42,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1133832428] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:10:42,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353828538] [2021-11-21 01:10:42,530 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:10:42,531 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:42,531 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:10:42,531 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:10:42,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Waiting until timeout for monitored process [2021-11-21 01:10:42,919 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 62 check-sat command(s) [2021-11-21 01:10:42,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:10:42,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 958 conjuncts, 127 conjunts are in the unsatisfiable core [2021-11-21 01:10:42,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:10:43,527 INFO L134 CoverageAnalysis]: Checked inductivity of 7565 backedges. 1953 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:43,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:10:44,138 INFO L134 CoverageAnalysis]: Checked inductivity of 7565 backedges. 1953 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:44,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [353828538] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:10:44,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1944094903] [2021-11-21 01:10:44,139 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:10:44,139 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:10:44,139 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:10:44,139 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:10:44,139 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:10:44,854 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:10:45,196 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:10:45,196 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:10:45,197 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 67 [2021-11-21 01:10:45,197 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258771672] [2021-11-21 01:10:45,197 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:10:45,197 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-21 01:10:45,197 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:10:45,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-21 01:10:45,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2109, Invalid=3147, Unknown=0, NotChecked=0, Total=5256 [2021-11-21 01:10:45,198 INFO L87 Difference]: Start difference. First operand 251 states and 252 transitions. Second operand has 68 states, 68 states have (on average 3.735294117647059) internal successors, (254), 67 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) [2021-11-21 01:10:47,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:10:47,032 INFO L93 Difference]: Finished difference Result 262 states and 263 transitions. [2021-11-21 01:10:47,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2021-11-21 01:10:47,033 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 3.735294117647059) internal successors, (254), 67 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 250 [2021-11-21 01:10:47,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:10:47,034 INFO L225 Difference]: With dead ends: 262 [2021-11-21 01:10:47,034 INFO L226 Difference]: Without dead ends: 260 [2021-11-21 01:10:47,035 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 938 GetRequests, 801 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4784 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=6400, Invalid=12232, Unknown=0, NotChecked=0, Total=18632 [2021-11-21 01:10:47,035 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 259 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 607 mSolverCounterSat, 314 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 921 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 314 IncrementalHoareTripleChecker+Valid, 607 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:10:47,035 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [259 Valid, 17 Invalid, 921 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [314 Valid, 607 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:10:47,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-11-21 01:10:47,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 254. [2021-11-21 01:10:47,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 254 states, 253 states have (on average 1.007905138339921) internal successors, (255), 253 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:47,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 255 transitions. [2021-11-21 01:10:47,093 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 255 transitions. Word has length 250 [2021-11-21 01:10:47,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:10:47,093 INFO L470 AbstractCegarLoop]: Abstraction has 254 states and 255 transitions. [2021-11-21 01:10:47,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 3.735294117647059) internal successors, (254), 67 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) [2021-11-21 01:10:47,094 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 255 transitions. [2021-11-21 01:10:47,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 254 [2021-11-21 01:10:47,094 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:10:47,095 INFO L514 BasicCegarLoop]: trace histogram [63, 62, 62, 62, 1, 1, 1, 1] [2021-11-21 01:10:47,119 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Forceful destruction successful, exit code 0 [2021-11-21 01:10:47,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable123 [2021-11-21 01:10:47,295 INFO L402 AbstractCegarLoop]: === Iteration 125 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:10:47,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:10:47,296 INFO L85 PathProgramCache]: Analyzing trace with hash 1120815347, now seen corresponding path program 123 times [2021-11-21 01:10:47,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:10:47,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1809925487] [2021-11-21 01:10:47,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:10:47,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:10:47,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:10:52,019 INFO L134 CoverageAnalysis]: Checked inductivity of 7750 backedges. 5797 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:52,019 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:10:52,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1809925487] [2021-11-21 01:10:52,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1809925487] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:10:52,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [158264065] [2021-11-21 01:10:52,020 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:10:52,020 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:52,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:10:52,020 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:10:52,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Waiting until timeout for monitored process [2021-11-21 01:10:52,200 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:10:52,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:10:52,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 968 conjuncts, 128 conjunts are in the unsatisfiable core [2021-11-21 01:10:52,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:10:52,774 INFO L134 CoverageAnalysis]: Checked inductivity of 7750 backedges. 5797 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:52,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:10:53,344 INFO L134 CoverageAnalysis]: Checked inductivity of 7750 backedges. 5797 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:10:53,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [158264065] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:10:53,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1126906896] [2021-11-21 01:10:53,345 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:10:53,345 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:10:53,345 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:10:53,346 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:10:53,346 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:10:54,053 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:10:54,572 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:10:54,572 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:10:54,572 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [127, 127, 127] total 128 [2021-11-21 01:10:54,572 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035047473] [2021-11-21 01:10:54,572 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:10:54,573 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2021-11-21 01:10:54,573 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:10:54,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2021-11-21 01:10:54,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4240, Invalid=13582, Unknown=0, NotChecked=0, Total=17822 [2021-11-21 01:10:54,575 INFO L87 Difference]: Start difference. First operand 254 states and 255 transitions. Second operand has 129 states, 129 states have (on average 1.9767441860465116) internal successors, (255), 128 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:58,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:10:58,184 INFO L93 Difference]: Finished difference Result 447 states and 449 transitions. [2021-11-21 01:10:58,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-11-21 01:10:58,185 INFO L78 Accepts]: Start accepts. Automaton has has 129 states, 129 states have (on average 1.9767441860465116) internal successors, (255), 128 states have internal predecessors, (255), 0 states have call successors, (0), 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 253 [2021-11-21 01:10:58,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:10:58,185 INFO L225 Difference]: With dead ends: 447 [2021-11-21 01:10:58,185 INFO L226 Difference]: Without dead ends: 255 [2021-11-21 01:10:58,187 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 947 GetRequests, 752 SyntacticMatches, 0 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6802 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=8398, Invalid=30214, Unknown=0, NotChecked=0, Total=38612 [2021-11-21 01:10:58,188 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 3 mSDsluCounter, 641 mSDsCounter, 0 mSdLazyCounter, 1440 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 705 SdHoareTripleChecker+Invalid, 1447 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:10:58,188 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 705 Invalid, 1447 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1440 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:10:58,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-11-21 01:10:58,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 255. [2021-11-21 01:10:58,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 254 states have (on average 1.0078740157480315) internal successors, (256), 254 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:58,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 256 transitions. [2021-11-21 01:10:58,247 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 256 transitions. Word has length 253 [2021-11-21 01:10:58,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:10:58,247 INFO L470 AbstractCegarLoop]: Abstraction has 255 states and 256 transitions. [2021-11-21 01:10:58,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 129 states, 129 states have (on average 1.9767441860465116) internal successors, (255), 128 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:10:58,247 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 256 transitions. [2021-11-21 01:10:58,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2021-11-21 01:10:58,248 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:10:58,248 INFO L514 BasicCegarLoop]: trace histogram [63, 63, 62, 62, 1, 1, 1, 1] [2021-11-21 01:10:58,275 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Forceful destruction successful, exit code 0 [2021-11-21 01:10:58,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable124,125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:10:58,449 INFO L402 AbstractCegarLoop]: === Iteration 126 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:10:58,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:10:58,449 INFO L85 PathProgramCache]: Analyzing trace with hash -684694230, now seen corresponding path program 124 times [2021-11-21 01:10:58,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:10:58,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1659723332] [2021-11-21 01:10:58,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:10:58,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:10:58,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:11:00,412 INFO L134 CoverageAnalysis]: Checked inductivity of 7813 backedges. 1953 proven. 5860 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:00,412 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:11:00,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1659723332] [2021-11-21 01:11:00,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1659723332] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:11:00,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839211680] [2021-11-21 01:11:00,412 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:11:00,412 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:11:00,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:11:00,413 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:11:00,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Waiting until timeout for monitored process [2021-11-21 01:11:00,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:11:00,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 973 conjuncts, 129 conjunts are in the unsatisfiable core [2021-11-21 01:11:00,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:11:01,195 INFO L134 CoverageAnalysis]: Checked inductivity of 7813 backedges. 2016 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:01,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:11:01,845 INFO L134 CoverageAnalysis]: Checked inductivity of 7813 backedges. 2016 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:01,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [839211680] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:11:01,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1892458927] [2021-11-21 01:11:01,846 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:11:01,846 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:11:01,846 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:11:01,846 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:11:01,847 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:11:02,577 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:11:02,936 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:11:02,936 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:11:02,937 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 68 [2021-11-21 01:11:02,937 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704329720] [2021-11-21 01:11:02,937 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:11:02,937 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-21 01:11:02,937 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:11:02,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-21 01:11:02,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2174, Invalid=3228, Unknown=0, NotChecked=0, Total=5402 [2021-11-21 01:11:02,938 INFO L87 Difference]: Start difference. First operand 255 states and 256 transitions. Second operand has 69 states, 69 states have (on average 3.739130434782609) internal successors, (258), 68 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:11:04,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:11:04,813 INFO L93 Difference]: Finished difference Result 266 states and 267 transitions. [2021-11-21 01:11:04,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2021-11-21 01:11:04,813 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 3.739130434782609) internal successors, (258), 68 states have internal predecessors, (258), 0 states have call successors, (0), 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 254 [2021-11-21 01:11:04,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:11:04,814 INFO L225 Difference]: With dead ends: 266 [2021-11-21 01:11:04,814 INFO L226 Difference]: Without dead ends: 264 [2021-11-21 01:11:04,815 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 953 GetRequests, 814 SyntacticMatches, 2 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4924 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=6597, Invalid=12585, Unknown=0, NotChecked=0, Total=19182 [2021-11-21 01:11:04,815 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 137 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 651 mSolverCounterSat, 194 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 845 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 194 IncrementalHoareTripleChecker+Valid, 651 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:11:04,815 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 16 Invalid, 845 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [194 Valid, 651 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:11:04,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-11-21 01:11:04,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 258. [2021-11-21 01:11:04,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 258 states, 257 states have (on average 1.0077821011673151) internal successors, (259), 257 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:11:04,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 259 transitions. [2021-11-21 01:11:04,871 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 259 transitions. Word has length 254 [2021-11-21 01:11:04,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:11:04,871 INFO L470 AbstractCegarLoop]: Abstraction has 258 states and 259 transitions. [2021-11-21 01:11:04,871 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 3.739130434782609) internal successors, (258), 68 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:11:04,871 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 259 transitions. [2021-11-21 01:11:04,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2021-11-21 01:11:04,872 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:11:04,872 INFO L514 BasicCegarLoop]: trace histogram [64, 63, 63, 63, 1, 1, 1, 1] [2021-11-21 01:11:04,898 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Ended with exit code 0 [2021-11-21 01:11:05,073 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable125 [2021-11-21 01:11:05,073 INFO L402 AbstractCegarLoop]: === Iteration 127 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:11:05,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:11:05,073 INFO L85 PathProgramCache]: Analyzing trace with hash -921296945, now seen corresponding path program 125 times [2021-11-21 01:11:05,074 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:11:05,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467974186] [2021-11-21 01:11:05,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:11:05,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:11:05,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:11:10,100 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 5985 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:10,100 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:11:10,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [467974186] [2021-11-21 01:11:10,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [467974186] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:11:10,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1377064016] [2021-11-21 01:11:10,101 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:11:10,101 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:11:10,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:11:10,102 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:11:10,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Waiting until timeout for monitored process [2021-11-21 01:11:10,512 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 64 check-sat command(s) [2021-11-21 01:11:10,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:11:10,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 983 conjuncts, 130 conjunts are in the unsatisfiable core [2021-11-21 01:11:10,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:11:11,120 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 5985 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:11,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:11:11,721 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 5985 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:11,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1377064016] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:11:11,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1456680654] [2021-11-21 01:11:11,722 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:11:11,722 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:11:11,722 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:11:11,722 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:11:11,723 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:11:12,432 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:11:12,980 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:11:12,980 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:11:12,980 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [129, 129, 129] total 130 [2021-11-21 01:11:12,980 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506698867] [2021-11-21 01:11:12,980 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:11:12,981 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 131 states [2021-11-21 01:11:12,981 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:11:12,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2021-11-21 01:11:12,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4371, Invalid=13989, Unknown=0, NotChecked=0, Total=18360 [2021-11-21 01:11:12,983 INFO L87 Difference]: Start difference. First operand 258 states and 259 transitions. Second operand has 131 states, 131 states have (on average 1.9770992366412214) internal successors, (259), 130 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:11:16,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:11:16,754 INFO L93 Difference]: Finished difference Result 454 states and 456 transitions. [2021-11-21 01:11:16,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2021-11-21 01:11:16,755 INFO L78 Accepts]: Start accepts. Automaton has has 131 states, 131 states have (on average 1.9770992366412214) internal successors, (259), 130 states have internal predecessors, (259), 0 states have call successors, (0), 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 257 [2021-11-21 01:11:16,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:11:16,755 INFO L225 Difference]: With dead ends: 454 [2021-11-21 01:11:16,756 INFO L226 Difference]: Without dead ends: 259 [2021-11-21 01:11:16,758 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 962 GetRequests, 764 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7006 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=8659, Invalid=31141, Unknown=0, NotChecked=0, Total=39800 [2021-11-21 01:11:16,758 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 3 mSDsluCounter, 664 mSDsCounter, 0 mSdLazyCounter, 1489 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 729 SdHoareTripleChecker+Invalid, 1495 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:11:16,758 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 729 Invalid, 1495 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 1489 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:11:16,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2021-11-21 01:11:16,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 259. [2021-11-21 01:11:16,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 258 states have (on average 1.0077519379844961) internal successors, (260), 258 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:11:16,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 260 transitions. [2021-11-21 01:11:16,820 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 260 transitions. Word has length 257 [2021-11-21 01:11:16,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:11:16,820 INFO L470 AbstractCegarLoop]: Abstraction has 259 states and 260 transitions. [2021-11-21 01:11:16,820 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 131 states, 131 states have (on average 1.9770992366412214) internal successors, (259), 130 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:11:16,820 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 260 transitions. [2021-11-21 01:11:16,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2021-11-21 01:11:16,821 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:11:16,821 INFO L514 BasicCegarLoop]: trace histogram [64, 64, 63, 63, 1, 1, 1, 1] [2021-11-21 01:11:16,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Forceful destruction successful, exit code 0 [2021-11-21 01:11:17,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable126,127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:11:17,026 INFO L402 AbstractCegarLoop]: === Iteration 128 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:11:17,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:11:17,026 INFO L85 PathProgramCache]: Analyzing trace with hash -367966074, now seen corresponding path program 126 times [2021-11-21 01:11:17,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:11:17,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618144549] [2021-11-21 01:11:17,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:11:17,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:11:17,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:11:19,052 INFO L134 CoverageAnalysis]: Checked inductivity of 8065 backedges. 2016 proven. 6049 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:19,052 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:11:19,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618144549] [2021-11-21 01:11:19,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1618144549] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:11:19,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1806964325] [2021-11-21 01:11:19,053 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:11:19,053 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:11:19,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:11:19,055 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:11:19,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Waiting until timeout for monitored process [2021-11-21 01:11:19,259 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:11:19,259 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:11:19,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 988 conjuncts, 131 conjunts are in the unsatisfiable core [2021-11-21 01:11:19,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:11:19,906 INFO L134 CoverageAnalysis]: Checked inductivity of 8065 backedges. 2080 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:19,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:11:20,521 INFO L134 CoverageAnalysis]: Checked inductivity of 8065 backedges. 2080 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:20,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1806964325] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:11:20,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [948107919] [2021-11-21 01:11:20,522 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:11:20,522 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:11:20,523 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:11:20,523 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:11:20,523 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:11:21,253 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:11:21,614 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:11:21,614 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:11:21,615 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 69 [2021-11-21 01:11:21,615 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564888635] [2021-11-21 01:11:21,615 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:11:21,616 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2021-11-21 01:11:21,616 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:11:21,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-11-21 01:11:21,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2240, Invalid=3310, Unknown=0, NotChecked=0, Total=5550 [2021-11-21 01:11:21,618 INFO L87 Difference]: Start difference. First operand 259 states and 260 transitions. Second operand has 70 states, 70 states have (on average 3.742857142857143) internal successors, (262), 69 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:11:23,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:11:23,616 INFO L93 Difference]: Finished difference Result 270 states and 271 transitions. [2021-11-21 01:11:23,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2021-11-21 01:11:23,617 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 3.742857142857143) internal successors, (262), 69 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 258 [2021-11-21 01:11:23,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:11:23,618 INFO L225 Difference]: With dead ends: 270 [2021-11-21 01:11:23,618 INFO L226 Difference]: Without dead ends: 268 [2021-11-21 01:11:23,620 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 968 GetRequests, 827 SyntacticMatches, 2 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5066 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=6797, Invalid=12943, Unknown=0, NotChecked=0, Total=19740 [2021-11-21 01:11:23,621 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 199 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 690 mSolverCounterSat, 261 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 951 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 261 IncrementalHoareTripleChecker+Valid, 690 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:11:23,621 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [199 Valid, 23 Invalid, 951 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [261 Valid, 690 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:11:23,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-11-21 01:11:23,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 262. [2021-11-21 01:11:23,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 261 states have (on average 1.0076628352490422) internal successors, (263), 261 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:11:23,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 263 transitions. [2021-11-21 01:11:23,712 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 263 transitions. Word has length 258 [2021-11-21 01:11:23,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:11:23,712 INFO L470 AbstractCegarLoop]: Abstraction has 262 states and 263 transitions. [2021-11-21 01:11:23,713 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 3.742857142857143) internal successors, (262), 69 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:11:23,713 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 263 transitions. [2021-11-21 01:11:23,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2021-11-21 01:11:23,714 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:11:23,714 INFO L514 BasicCegarLoop]: trace histogram [65, 64, 64, 64, 1, 1, 1, 1] [2021-11-21 01:11:23,757 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Forceful destruction successful, exit code 0 [2021-11-21 01:11:23,929 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable127,128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:11:23,929 INFO L402 AbstractCegarLoop]: === Iteration 129 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:11:23,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:11:23,930 INFO L85 PathProgramCache]: Analyzing trace with hash -1315950861, now seen corresponding path program 127 times [2021-11-21 01:11:23,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:11:23,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60850232] [2021-11-21 01:11:23,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:11:23,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:11:24,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:11:29,180 INFO L134 CoverageAnalysis]: Checked inductivity of 8256 backedges. 6176 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:29,180 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:11:29,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60850232] [2021-11-21 01:11:29,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60850232] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:11:29,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1189799265] [2021-11-21 01:11:29,181 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:11:29,181 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:11:29,181 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:11:29,182 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:11:29,184 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (129)] Waiting until timeout for monitored process [2021-11-21 01:11:29,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:11:29,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 132 conjunts are in the unsatisfiable core [2021-11-21 01:11:29,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:11:30,003 INFO L134 CoverageAnalysis]: Checked inductivity of 8256 backedges. 6176 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:30,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:11:30,600 INFO L134 CoverageAnalysis]: Checked inductivity of 8256 backedges. 6176 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:30,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1189799265] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:11:30,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [560400664] [2021-11-21 01:11:30,602 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:11:30,602 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:11:30,602 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:11:30,602 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:11:30,602 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:11:31,371 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:11:31,931 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:11:31,931 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:11:31,932 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [131, 131, 131] total 132 [2021-11-21 01:11:31,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906692912] [2021-11-21 01:11:31,952 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:11:31,953 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2021-11-21 01:11:31,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:11:31,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2021-11-21 01:11:31,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4504, Invalid=14402, Unknown=0, NotChecked=0, Total=18906 [2021-11-21 01:11:31,956 INFO L87 Difference]: Start difference. First operand 262 states and 263 transitions. Second operand has 133 states, 133 states have (on average 1.9774436090225564) internal successors, (263), 132 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:11:35,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:11:35,870 INFO L93 Difference]: Finished difference Result 461 states and 463 transitions. [2021-11-21 01:11:35,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2021-11-21 01:11:35,871 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 1.9774436090225564) internal successors, (263), 132 states have internal predecessors, (263), 0 states have call successors, (0), 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 261 [2021-11-21 01:11:35,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:11:35,871 INFO L225 Difference]: With dead ends: 461 [2021-11-21 01:11:35,872 INFO L226 Difference]: Without dead ends: 263 [2021-11-21 01:11:35,874 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 977 GetRequests, 776 SyntacticMatches, 0 SemanticMatches, 201 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7213 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=8924, Invalid=32082, Unknown=0, NotChecked=0, Total=41006 [2021-11-21 01:11:35,875 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 3 mSDsluCounter, 655 mSDsCounter, 0 mSdLazyCounter, 1476 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 721 SdHoareTripleChecker+Invalid, 1486 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1476 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:11:35,875 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 721 Invalid, 1486 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1476 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:11:35,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2021-11-21 01:11:35,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 263. [2021-11-21 01:11:35,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 262 states have (on average 1.0076335877862594) internal successors, (264), 262 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) [2021-11-21 01:11:35,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 264 transitions. [2021-11-21 01:11:35,959 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 264 transitions. Word has length 261 [2021-11-21 01:11:35,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:11:35,959 INFO L470 AbstractCegarLoop]: Abstraction has 263 states and 264 transitions. [2021-11-21 01:11:35,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 1.9774436090225564) internal successors, (263), 132 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:11:35,960 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 264 transitions. [2021-11-21 01:11:35,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2021-11-21 01:11:35,961 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:11:35,961 INFO L514 BasicCegarLoop]: trace histogram [65, 65, 64, 64, 1, 1, 1, 1] [2021-11-21 01:11:35,987 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (129)] Ended with exit code 0 [2021-11-21 01:11:36,165 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable128 [2021-11-21 01:11:36,165 INFO L402 AbstractCegarLoop]: === Iteration 130 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:11:36,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:11:36,166 INFO L85 PathProgramCache]: Analyzing trace with hash 449455146, now seen corresponding path program 128 times [2021-11-21 01:11:36,166 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:11:36,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2019607605] [2021-11-21 01:11:36,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:11:36,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:11:36,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:11:38,282 INFO L134 CoverageAnalysis]: Checked inductivity of 8321 backedges. 2080 proven. 6241 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:38,282 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:11:38,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2019607605] [2021-11-21 01:11:38,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2019607605] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:11:38,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [735101797] [2021-11-21 01:11:38,283 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:11:38,283 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:11:38,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:11:38,284 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:11:38,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (130)] Waiting until timeout for monitored process [2021-11-21 01:11:38,729 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 65 check-sat command(s) [2021-11-21 01:11:38,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:11:38,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 1003 conjuncts, 133 conjunts are in the unsatisfiable core [2021-11-21 01:11:38,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:11:39,392 INFO L134 CoverageAnalysis]: Checked inductivity of 8321 backedges. 2145 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:39,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:11:40,051 INFO L134 CoverageAnalysis]: Checked inductivity of 8321 backedges. 2145 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:40,052 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [735101797] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:11:40,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1707015036] [2021-11-21 01:11:40,053 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:11:40,053 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:11:40,054 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:11:40,054 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:11:40,054 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:11:40,819 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:11:41,188 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:11:41,188 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:11:41,189 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 70 [2021-11-21 01:11:41,189 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662324715] [2021-11-21 01:11:41,189 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:11:41,190 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-21 01:11:41,190 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:11:41,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-21 01:11:41,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2307, Invalid=3393, Unknown=0, NotChecked=0, Total=5700 [2021-11-21 01:11:41,191 INFO L87 Difference]: Start difference. First operand 263 states and 264 transitions. Second operand has 71 states, 71 states have (on average 3.7464788732394365) internal successors, (266), 70 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:11:43,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:11:43,190 INFO L93 Difference]: Finished difference Result 274 states and 275 transitions. [2021-11-21 01:11:43,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2021-11-21 01:11:43,191 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.7464788732394365) internal successors, (266), 70 states have internal predecessors, (266), 0 states have call successors, (0), 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 262 [2021-11-21 01:11:43,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:11:43,191 INFO L225 Difference]: With dead ends: 274 [2021-11-21 01:11:43,192 INFO L226 Difference]: Without dead ends: 272 [2021-11-21 01:11:43,193 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 983 GetRequests, 840 SyntacticMatches, 2 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5210 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=7000, Invalid=13306, Unknown=0, NotChecked=0, Total=20306 [2021-11-21 01:11:43,193 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 143 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 679 mSolverCounterSat, 200 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 879 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 200 IncrementalHoareTripleChecker+Valid, 679 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:11:43,193 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [143 Valid, 14 Invalid, 879 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [200 Valid, 679 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:11:43,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2021-11-21 01:11:43,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 266. [2021-11-21 01:11:43,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 265 states have (on average 1.0075471698113208) internal successors, (267), 265 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:11:43,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 267 transitions. [2021-11-21 01:11:43,260 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 267 transitions. Word has length 262 [2021-11-21 01:11:43,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:11:43,261 INFO L470 AbstractCegarLoop]: Abstraction has 266 states and 267 transitions. [2021-11-21 01:11:43,261 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 3.7464788732394365) internal successors, (266), 70 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:11:43,261 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 267 transitions. [2021-11-21 01:11:43,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2021-11-21 01:11:43,262 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:11:43,262 INFO L514 BasicCegarLoop]: trace histogram [66, 65, 65, 65, 1, 1, 1, 1] [2021-11-21 01:11:43,289 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (130)] Ended with exit code 0 [2021-11-21 01:11:43,462 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable129 [2021-11-21 01:11:43,463 INFO L402 AbstractCegarLoop]: === Iteration 131 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:11:43,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:11:43,463 INFO L85 PathProgramCache]: Analyzing trace with hash -1984954161, now seen corresponding path program 129 times [2021-11-21 01:11:43,463 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:11:43,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [950612803] [2021-11-21 01:11:43,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:11:43,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:11:43,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:11:48,815 INFO L134 CoverageAnalysis]: Checked inductivity of 8515 backedges. 6370 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:48,815 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:11:48,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [950612803] [2021-11-21 01:11:48,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [950612803] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:11:48,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1159698108] [2021-11-21 01:11:48,816 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:11:48,816 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:11:48,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:11:48,817 INFO L229 MonitoredProcess]: Starting monitored process 131 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:11:48,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Waiting until timeout for monitored process [2021-11-21 01:11:49,055 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:11:49,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:11:49,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 1013 conjuncts, 134 conjunts are in the unsatisfiable core [2021-11-21 01:11:49,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:11:49,803 INFO L134 CoverageAnalysis]: Checked inductivity of 8515 backedges. 6370 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:49,803 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:11:50,404 INFO L134 CoverageAnalysis]: Checked inductivity of 8515 backedges. 6370 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:50,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1159698108] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:11:50,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2074157933] [2021-11-21 01:11:50,406 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:11:50,406 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:11:50,406 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:11:50,406 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:11:50,406 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:11:51,135 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:11:51,692 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:11:51,692 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:11:51,692 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [133, 133, 133] total 134 [2021-11-21 01:11:51,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764190958] [2021-11-21 01:11:51,692 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:11:51,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 135 states [2021-11-21 01:11:51,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:11:51,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 135 interpolants. [2021-11-21 01:11:51,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4639, Invalid=14821, Unknown=0, NotChecked=0, Total=19460 [2021-11-21 01:11:51,695 INFO L87 Difference]: Start difference. First operand 266 states and 267 transitions. Second operand has 135 states, 135 states have (on average 1.9777777777777779) internal successors, (267), 134 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:11:55,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:11:55,643 INFO L93 Difference]: Finished difference Result 468 states and 470 transitions. [2021-11-21 01:11:55,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2021-11-21 01:11:55,643 INFO L78 Accepts]: Start accepts. Automaton has has 135 states, 135 states have (on average 1.9777777777777779) internal successors, (267), 134 states have internal predecessors, (267), 0 states have call successors, (0), 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 265 [2021-11-21 01:11:55,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:11:55,644 INFO L225 Difference]: With dead ends: 468 [2021-11-21 01:11:55,644 INFO L226 Difference]: Without dead ends: 267 [2021-11-21 01:11:55,647 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 992 GetRequests, 788 SyntacticMatches, 0 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7423 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=9193, Invalid=33037, Unknown=0, NotChecked=0, Total=42230 [2021-11-21 01:11:55,647 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 3 mSDsluCounter, 624 mSDsCounter, 0 mSdLazyCounter, 1414 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 691 SdHoareTripleChecker+Invalid, 1419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 1414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:11:55,647 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 691 Invalid, 1419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 1414 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:11:55,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2021-11-21 01:11:55,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 267. [2021-11-21 01:11:55,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 266 states have (on average 1.0075187969924813) internal successors, (268), 266 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:11:55,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 268 transitions. [2021-11-21 01:11:55,712 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 268 transitions. Word has length 265 [2021-11-21 01:11:55,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:11:55,712 INFO L470 AbstractCegarLoop]: Abstraction has 267 states and 268 transitions. [2021-11-21 01:11:55,712 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 135 states, 135 states have (on average 1.9777777777777779) internal successors, (267), 134 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:11:55,712 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 268 transitions. [2021-11-21 01:11:55,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2021-11-21 01:11:55,713 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:11:55,714 INFO L514 BasicCegarLoop]: trace histogram [66, 66, 65, 65, 1, 1, 1, 1] [2021-11-21 01:11:55,740 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Ended with exit code 0 [2021-11-21 01:11:55,914 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable130,131 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:11:55,914 INFO L402 AbstractCegarLoop]: === Iteration 132 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:11:55,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:11:55,914 INFO L85 PathProgramCache]: Analyzing trace with hash 770605702, now seen corresponding path program 130 times [2021-11-21 01:11:55,915 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:11:55,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1230727327] [2021-11-21 01:11:55,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:11:55,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:11:56,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:11:58,039 INFO L134 CoverageAnalysis]: Checked inductivity of 8581 backedges. 2145 proven. 6436 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:58,039 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:11:58,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1230727327] [2021-11-21 01:11:58,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1230727327] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:11:58,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [551705195] [2021-11-21 01:11:58,039 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:11:58,039 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:11:58,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:11:58,040 INFO L229 MonitoredProcess]: Starting monitored process 132 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:11:58,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (132)] Waiting until timeout for monitored process [2021-11-21 01:11:58,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:11:58,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 1018 conjuncts, 135 conjunts are in the unsatisfiable core [2021-11-21 01:11:58,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:11:58,867 INFO L134 CoverageAnalysis]: Checked inductivity of 8581 backedges. 2211 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:58,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:11:59,504 INFO L134 CoverageAnalysis]: Checked inductivity of 8581 backedges. 2211 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:11:59,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [551705195] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:11:59,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [762422875] [2021-11-21 01:11:59,506 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:11:59,506 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:11:59,507 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:11:59,507 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:11:59,507 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:12:00,264 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:12:00,604 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:12:00,604 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:12:00,604 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 71 [2021-11-21 01:12:00,604 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144075462] [2021-11-21 01:12:00,604 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:12:00,605 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-21 01:12:00,605 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:12:00,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-21 01:12:00,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2375, Invalid=3477, Unknown=0, NotChecked=0, Total=5852 [2021-11-21 01:12:00,606 INFO L87 Difference]: Start difference. First operand 267 states and 268 transitions. Second operand has 72 states, 72 states have (on average 3.75) internal successors, (270), 71 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:02,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:12:02,609 INFO L93 Difference]: Finished difference Result 278 states and 279 transitions. [2021-11-21 01:12:02,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2021-11-21 01:12:02,610 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 3.75) internal successors, (270), 71 states have internal predecessors, (270), 0 states have call successors, (0), 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 266 [2021-11-21 01:12:02,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:12:02,611 INFO L225 Difference]: With dead ends: 278 [2021-11-21 01:12:02,611 INFO L226 Difference]: Without dead ends: 276 [2021-11-21 01:12:02,612 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 998 GetRequests, 853 SyntacticMatches, 2 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5356 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=7206, Invalid=13674, Unknown=0, NotChecked=0, Total=20880 [2021-11-21 01:12:02,613 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 275 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 593 mSolverCounterSat, 334 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 275 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 927 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 334 IncrementalHoareTripleChecker+Valid, 593 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:12:02,613 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [275 Valid, 17 Invalid, 927 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [334 Valid, 593 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:12:02,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2021-11-21 01:12:02,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 270. [2021-11-21 01:12:02,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 269 states have (on average 1.0074349442379182) internal successors, (271), 269 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:02,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 271 transitions. [2021-11-21 01:12:02,693 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 271 transitions. Word has length 266 [2021-11-21 01:12:02,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:12:02,694 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 271 transitions. [2021-11-21 01:12:02,694 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 3.75) internal successors, (270), 71 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:02,694 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 271 transitions. [2021-11-21 01:12:02,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2021-11-21 01:12:02,695 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:12:02,695 INFO L514 BasicCegarLoop]: trace histogram [67, 66, 66, 66, 1, 1, 1, 1] [2021-11-21 01:12:02,721 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (132)] Ended with exit code 0 [2021-11-21 01:12:02,895 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable131,132 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:02,896 INFO L402 AbstractCegarLoop]: === Iteration 133 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:12:02,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:12:02,896 INFO L85 PathProgramCache]: Analyzing trace with hash 519091443, now seen corresponding path program 131 times [2021-11-21 01:12:02,896 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:12:02,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [267961149] [2021-11-21 01:12:02,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:12:02,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:12:03,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:12:08,405 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 6567 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:12:08,405 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:12:08,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [267961149] [2021-11-21 01:12:08,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [267961149] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:12:08,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1964238239] [2021-11-21 01:12:08,405 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:12:08,405 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:08,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:12:08,406 INFO L229 MonitoredProcess]: Starting monitored process 133 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:12:08,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (133)] Waiting until timeout for monitored process [2021-11-21 01:12:08,840 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 67 check-sat command(s) [2021-11-21 01:12:08,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:12:08,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 1028 conjuncts, 136 conjunts are in the unsatisfiable core [2021-11-21 01:12:08,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:12:09,476 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 6567 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:12:09,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:12:10,083 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 6567 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:12:10,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1964238239] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:12:10,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [86462393] [2021-11-21 01:12:10,085 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:12:10,085 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:12:10,086 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:12:10,086 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:12:10,086 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:12:10,779 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:12:11,333 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:12:11,333 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:12:11,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [135, 135, 135] total 136 [2021-11-21 01:12:11,334 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917059688] [2021-11-21 01:12:11,334 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:12:11,334 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 137 states [2021-11-21 01:12:11,334 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:12:11,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2021-11-21 01:12:11,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4776, Invalid=15246, Unknown=0, NotChecked=0, Total=20022 [2021-11-21 01:12:11,336 INFO L87 Difference]: Start difference. First operand 270 states and 271 transitions. Second operand has 137 states, 137 states have (on average 1.9781021897810218) internal successors, (271), 136 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:15,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:12:15,332 INFO L93 Difference]: Finished difference Result 475 states and 477 transitions. [2021-11-21 01:12:15,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2021-11-21 01:12:15,332 INFO L78 Accepts]: Start accepts. Automaton has has 137 states, 137 states have (on average 1.9781021897810218) internal successors, (271), 136 states have internal predecessors, (271), 0 states have call successors, (0), 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 269 [2021-11-21 01:12:15,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:12:15,333 INFO L225 Difference]: With dead ends: 475 [2021-11-21 01:12:15,333 INFO L226 Difference]: Without dead ends: 271 [2021-11-21 01:12:15,335 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1007 GetRequests, 800 SyntacticMatches, 0 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7636 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=9466, Invalid=34006, Unknown=0, NotChecked=0, Total=43472 [2021-11-21 01:12:15,335 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 3 mSDsluCounter, 576 mSDsCounter, 0 mSdLazyCounter, 1325 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 644 SdHoareTripleChecker+Invalid, 1334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:12:15,336 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 644 Invalid, 1334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1325 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:12:15,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2021-11-21 01:12:15,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 271. [2021-11-21 01:12:15,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 270 states have (on average 1.0074074074074073) internal successors, (272), 270 states have internal predecessors, (272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:15,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 272 transitions. [2021-11-21 01:12:15,402 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 272 transitions. Word has length 269 [2021-11-21 01:12:15,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:12:15,402 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 272 transitions. [2021-11-21 01:12:15,403 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 137 states, 137 states have (on average 1.9781021897810218) internal successors, (271), 136 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:15,403 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 272 transitions. [2021-11-21 01:12:15,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2021-11-21 01:12:15,404 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:12:15,404 INFO L514 BasicCegarLoop]: trace histogram [67, 67, 66, 66, 1, 1, 1, 1] [2021-11-21 01:12:15,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (133)] Forceful destruction successful, exit code 0 [2021-11-21 01:12:15,604 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable132,133 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:15,604 INFO L402 AbstractCegarLoop]: === Iteration 134 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:12:15,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:12:15,605 INFO L85 PathProgramCache]: Analyzing trace with hash -1743158486, now seen corresponding path program 132 times [2021-11-21 01:12:15,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:12:15,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [596507875] [2021-11-21 01:12:15,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:12:15,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:12:15,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:12:17,786 INFO L134 CoverageAnalysis]: Checked inductivity of 8845 backedges. 2211 proven. 6634 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:12:17,786 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:12:17,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [596507875] [2021-11-21 01:12:17,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [596507875] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:12:17,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [126283146] [2021-11-21 01:12:17,786 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:12:17,786 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:17,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:12:17,787 INFO L229 MonitoredProcess]: Starting monitored process 134 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:12:17,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Waiting until timeout for monitored process [2021-11-21 01:12:17,986 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:12:17,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:12:18,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 1033 conjuncts, 137 conjunts are in the unsatisfiable core [2021-11-21 01:12:18,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:12:18,670 INFO L134 CoverageAnalysis]: Checked inductivity of 8845 backedges. 2278 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:12:18,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:12:19,305 INFO L134 CoverageAnalysis]: Checked inductivity of 8845 backedges. 2278 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:12:19,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [126283146] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:12:19,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [631851412] [2021-11-21 01:12:19,307 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:12:19,307 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:12:19,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:12:19,308 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:12:19,308 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:12:20,070 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:12:20,441 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:12:20,441 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:12:20,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 72 [2021-11-21 01:12:20,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982343051] [2021-11-21 01:12:20,442 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:12:20,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-21 01:12:20,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:12:20,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-21 01:12:20,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2444, Invalid=3562, Unknown=0, NotChecked=0, Total=6006 [2021-11-21 01:12:20,443 INFO L87 Difference]: Start difference. First operand 271 states and 272 transitions. Second operand has 73 states, 73 states have (on average 3.7534246575342465) internal successors, (274), 72 states have internal predecessors, (274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:22,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:12:22,516 INFO L93 Difference]: Finished difference Result 282 states and 283 transitions. [2021-11-21 01:12:22,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 141 states. [2021-11-21 01:12:22,517 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 3.7534246575342465) internal successors, (274), 72 states have internal predecessors, (274), 0 states have call successors, (0), 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 270 [2021-11-21 01:12:22,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:12:22,517 INFO L225 Difference]: With dead ends: 282 [2021-11-21 01:12:22,517 INFO L226 Difference]: Without dead ends: 280 [2021-11-21 01:12:22,519 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1013 GetRequests, 866 SyntacticMatches, 2 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5504 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=7415, Invalid=14047, Unknown=0, NotChecked=0, Total=21462 [2021-11-21 01:12:22,520 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 214 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 635 mSolverCounterSat, 273 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 908 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 273 IncrementalHoareTripleChecker+Valid, 635 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:12:22,520 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [214 Valid, 11 Invalid, 908 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [273 Valid, 635 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:12:22,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2021-11-21 01:12:22,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 274. [2021-11-21 01:12:22,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 274 states, 273 states have (on average 1.0073260073260073) internal successors, (275), 273 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) [2021-11-21 01:12:22,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 275 transitions. [2021-11-21 01:12:22,603 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 275 transitions. Word has length 270 [2021-11-21 01:12:22,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:12:22,603 INFO L470 AbstractCegarLoop]: Abstraction has 274 states and 275 transitions. [2021-11-21 01:12:22,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 3.7534246575342465) internal successors, (274), 72 states have internal predecessors, (274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:12:22,604 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 275 transitions. [2021-11-21 01:12:22,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2021-11-21 01:12:22,605 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:12:22,605 INFO L514 BasicCegarLoop]: trace histogram [68, 67, 67, 67, 1, 1, 1, 1] [2021-11-21 01:12:22,631 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Ended with exit code 0 [2021-11-21 01:12:22,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 134 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable133 [2021-11-21 01:12:22,805 INFO L402 AbstractCegarLoop]: === Iteration 135 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:12:22,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:12:22,806 INFO L85 PathProgramCache]: Analyzing trace with hash 19939791, now seen corresponding path program 133 times [2021-11-21 01:12:22,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:12:22,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844827858] [2021-11-21 01:12:22,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:12:22,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:12:22,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:12:28,477 INFO L134 CoverageAnalysis]: Checked inductivity of 9045 backedges. 6767 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:12:28,478 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:12:28,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844827858] [2021-11-21 01:12:28,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1844827858] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:12:28,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [562162434] [2021-11-21 01:12:28,478 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:12:28,478 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:12:28,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:12:28,479 INFO L229 MonitoredProcess]: Starting monitored process 135 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:12:28,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d947126-f918-45eb-82a9-a45088f341e7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (135)] Waiting until timeout for monitored process [2021-11-21 01:12:28,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:12:28,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 1043 conjuncts, 138 conjunts are in the unsatisfiable core [2021-11-21 01:12:28,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:12:29,284 INFO L134 CoverageAnalysis]: Checked inductivity of 9045 backedges. 6767 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:12:29,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:12:29,886 INFO L134 CoverageAnalysis]: Checked inductivity of 9045 backedges. 6767 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:12:29,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [562162434] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:12:29,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [143696836] [2021-11-21 01:12:29,887 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:12:29,887 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:12:29,887 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:12:29,888 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:12:29,888 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:12:30,633 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:12:31,188 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:12:31,188 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:12:31,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [137, 137, 137] total 138 [2021-11-21 01:12:31,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322805004] [2021-11-21 01:12:31,188 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:12:31,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 139 states [2021-11-21 01:12:31,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:12:31,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2021-11-21 01:12:31,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4915, Invalid=15677, Unknown=0, NotChecked=0, Total=20592 [2021-11-21 01:12:31,191 INFO L87 Difference]: Start difference. First operand 274 states and 275 transitions. Second operand has 139 states, 139 states have (on average 1.9784172661870503) internal successors, (275), 138 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)