./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c --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_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/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_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/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_797e1e47-0e04-472d-b7b6-5197df93544c/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 39463d01f5c85d47bf5e231172595e96b8ff556c59c4a9ab8cf46a88a393b05c --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:40:53,680 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:40:53,682 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:40:53,733 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:40:53,734 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:40:53,738 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:40:53,740 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:40:53,743 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:40:53,746 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:40:53,751 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:40:53,752 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:40:53,754 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:40:53,755 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:40:53,757 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:40:53,759 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:40:53,764 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:40:53,765 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:40:53,766 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:40:53,768 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:40:53,776 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:40:53,778 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:40:53,779 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:40:53,782 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:40:53,783 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:40:53,792 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:40:53,793 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:40:53,793 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:40:53,795 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:40:53,795 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:40:53,797 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:40:53,797 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:40:53,798 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:40:53,800 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:40:53,801 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:40:53,803 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:40:53,803 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:40:53,804 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:40:53,804 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:40:53,804 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:40:53,805 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:40:53,806 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:40:53,807 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:40:53,849 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:40:53,852 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:40:53,859 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:40:53,859 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:40:53,860 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:40:53,860 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:40:53,860 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:40:53,861 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:40:53,861 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:40:53,861 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:40:53,862 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:40:53,862 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:40:53,863 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:40:53,863 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:40:53,863 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:40:53,863 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:40:53,864 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:40:53,864 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:40:53,865 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:40:53,865 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:40:53,865 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:40:53,866 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:40:53,866 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:40:53,866 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:40:53,866 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:40:53,867 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:40:53,867 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:40:53,867 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:40:53,867 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:40:53,867 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:40:53,868 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:40:53,868 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:40:53,868 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:40:53,869 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:40:53,869 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:40:53,869 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:40:53,869 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:40:53,869 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:40:53,870 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:40:53,870 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:40:53,870 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:40:53,870 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_797e1e47-0e04-472d-b7b6-5197df93544c/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 39463d01f5c85d47bf5e231172595e96b8ff556c59c4a9ab8cf46a88a393b05c [2021-11-21 00:40:54,174 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:40:54,195 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:40:54,198 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:40:54,199 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:40:54,200 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:40:54,201 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c [2021-11-21 00:40:54,283 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/data/7de925e31/d473f7ffe5ab4f128bbaf25fa5909f4f/FLAG797c0d79a [2021-11-21 00:40:54,726 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:40:54,728 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c [2021-11-21 00:40:54,738 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/data/7de925e31/d473f7ffe5ab4f128bbaf25fa5909f4f/FLAG797c0d79a [2021-11-21 00:40:55,100 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/data/7de925e31/d473f7ffe5ab4f128bbaf25fa5909f4f [2021-11-21 00:40:55,102 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:40:55,104 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:40:55,109 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:40:55,109 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:40:55,112 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:40:55,114 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:40:55" (1/1) ... [2021-11-21 00:40:55,116 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@34418db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:55, skipping insertion in model container [2021-11-21 00:40:55,117 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:40:55" (1/1) ... [2021-11-21 00:40:55,124 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:40:55,141 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:40:55,351 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_797e1e47-0e04-472d-b7b6-5197df93544c/sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c[465,478] [2021-11-21 00:40:55,373 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:40:55,389 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:40:55,406 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c[465,478] [2021-11-21 00:40:55,423 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:40:55,441 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:40:55,442 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:55 WrapperNode [2021-11-21 00:40:55,442 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:40:55,443 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:40:55,444 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:40:55,444 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:40:55,451 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:55" (1/1) ... [2021-11-21 00:40:55,459 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:55" (1/1) ... [2021-11-21 00:40:55,487 INFO L137 Inliner]: procedures = 14, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 62 [2021-11-21 00:40:55,488 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:40:55,489 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:40:55,489 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:40:55,489 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:40:55,499 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:55" (1/1) ... [2021-11-21 00:40:55,500 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:55" (1/1) ... [2021-11-21 00:40:55,513 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:55" (1/1) ... [2021-11-21 00:40:55,514 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:55" (1/1) ... [2021-11-21 00:40:55,517 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:55" (1/1) ... [2021-11-21 00:40:55,522 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:55" (1/1) ... [2021-11-21 00:40:55,523 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:55" (1/1) ... [2021-11-21 00:40:55,525 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:40:55,526 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:40:55,526 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:40:55,527 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:40:55,528 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:55" (1/1) ... [2021-11-21 00:40:55,547 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:40:55,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:40:55,575 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:40:55,594 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:40:55,632 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:40:55,632 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:40:55,632 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:40:55,632 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:40:55,709 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:40:55,710 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:40:55,887 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:40:55,955 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:40:55,955 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 00:40:55,957 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:40:55 BoogieIcfgContainer [2021-11-21 00:40:55,957 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:40:55,959 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:40:55,959 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:40:55,963 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:40:55,963 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:40:55" (1/3) ... [2021-11-21 00:40:55,964 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42b7b3ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:40:55, skipping insertion in model container [2021-11-21 00:40:55,964 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:55" (2/3) ... [2021-11-21 00:40:55,964 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42b7b3ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:40:55, skipping insertion in model container [2021-11-21 00:40:55,965 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:40:55" (3/3) ... [2021-11-21 00:40:55,966 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_delay_nd.c [2021-11-21 00:40:55,971 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:40:55,971 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:40:56,049 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:40:56,059 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 00:40:56,060 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:40:56,085 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 00:40:56,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 00:40:56,091 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:40:56,092 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-21 00:40:56,093 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:40:56,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:40:56,099 INFO L85 PathProgramCache]: Analyzing trace with hash 108685352, now seen corresponding path program 1 times [2021-11-21 00:40:56,109 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:40:56,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [651267937] [2021-11-21 00:40:56,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:56,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:40:56,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:56,388 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 00:40:56,389 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:40:56,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [651267937] [2021-11-21 00:40:56,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [651267937] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:40:56,390 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:40:56,391 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:40:56,393 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861668599] [2021-11-21 00:40:56,393 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:40:56,397 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:40:56,398 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:40:56,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:40:56,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:40:56,427 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 00:40:56,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:40:56,456 INFO L93 Difference]: Finished difference Result 16 states and 23 transitions. [2021-11-21 00:40:56,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:40:56,459 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 00:40:56,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:40:56,466 INFO L225 Difference]: With dead ends: 16 [2021-11-21 00:40:56,467 INFO L226 Difference]: Without dead ends: 9 [2021-11-21 00:40:56,469 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:40:56,473 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 8 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:40:56,474 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 9 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:40:56,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-21 00:40:56,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 8. [2021-11-21 00:40:56,502 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 00:40:56,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2021-11-21 00:40:56,503 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 5 [2021-11-21 00:40:56,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:40:56,504 INFO L470 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2021-11-21 00:40:56,504 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 00:40:56,504 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2021-11-21 00:40:56,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 00:40:56,505 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:40:56,505 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-21 00:40:56,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:40:56,505 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:40:56,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:40:56,506 INFO L85 PathProgramCache]: Analyzing trace with hash -925984695, now seen corresponding path program 1 times [2021-11-21 00:40:56,506 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:40:56,507 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871030314] [2021-11-21 00:40:56,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:56,507 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:40:56,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:56,623 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 00:40:56,623 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:40:56,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871030314] [2021-11-21 00:40:56,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [871030314] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:40:56,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494613514] [2021-11-21 00:40:56,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:56,624 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:40:56,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:40:56,631 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:40:56,637 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:40:56,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:56,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:40:56,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:40:56,769 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 00:40:56,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:40:56,839 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 00:40:56,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494613514] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:40:56,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1996012508] [2021-11-21 00:40:56,868 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-21 00:40:56,868 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:40:56,872 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:40:56,877 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:40:56,878 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:40:59,413 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:40:59,819 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:40:59,819 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:40:59,819 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2021-11-21 00:40:59,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313270719] [2021-11-21 00:40:59,820 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:40:59,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-21 00:40:59,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:40:59,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-21 00:40:59,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2021-11-21 00:40:59,825 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:40:59,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:40:59,880 INFO L93 Difference]: Finished difference Result 19 states and 24 transitions. [2021-11-21 00:40:59,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:40:59,881 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have 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 00:40:59,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:40:59,882 INFO L225 Difference]: With dead ends: 19 [2021-11-21 00:40:59,882 INFO L226 Difference]: Without dead ends: 12 [2021-11-21 00:40:59,884 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=83, Invalid=157, Unknown=0, NotChecked=0, Total=240 [2021-11-21 00:40:59,887 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 16 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:40:59,888 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 13 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:40:59,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-11-21 00:40:59,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2021-11-21 00:40:59,895 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 00:40:59,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2021-11-21 00:40:59,895 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 6 [2021-11-21 00:40:59,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:40:59,896 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2021-11-21 00:40:59,897 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:40:59,897 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2021-11-21 00:40:59,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-21 00:40:59,898 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:40:59,898 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1] [2021-11-21 00:40:59,939 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:41:00,122 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:41:00,123 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:41:00,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:41:00,124 INFO L85 PathProgramCache]: Analyzing trace with hash 303425640, now seen corresponding path program 2 times [2021-11-21 00:41:00,124 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:41:00,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099709914] [2021-11-21 00:41:00,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:41:00,124 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:41:00,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:41:00,212 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:41:00,213 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:41:00,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099709914] [2021-11-21 00:41:00,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2099709914] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:41:00,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [372275704] [2021-11-21 00:41:00,218 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:41:00,218 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:41:00,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:41:00,219 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:41:00,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:41:00,303 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:41:00,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:41:00,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 00:41:00,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:41:00,433 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:41:00,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:41:00,520 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:41:00,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [372275704] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:41:00,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1494164845] [2021-11-21 00:41:00,524 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-21 00:41:00,524 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:41:00,524 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:41:00,525 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:41:00,525 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:41:02,515 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:41:02,920 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:41:02,920 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:41:02,920 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 18 [2021-11-21 00:41:02,920 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980515901] [2021-11-21 00:41:02,921 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:41:02,921 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-21 00:41:02,921 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:41:02,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-21 00:41:02,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=326, Unknown=0, NotChecked=0, Total=506 [2021-11-21 00:41:02,922 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 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 00:41:03,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:41:03,057 INFO L93 Difference]: Finished difference Result 28 states and 36 transitions. [2021-11-21 00:41:03,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 00:41:03,058 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 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 9 [2021-11-21 00:41:03,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:41:03,058 INFO L225 Difference]: With dead ends: 28 [2021-11-21 00:41:03,058 INFO L226 Difference]: Without dead ends: 18 [2021-11-21 00:41:03,059 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=260, Invalid=496, Unknown=0, NotChecked=0, Total=756 [2021-11-21 00:41:03,060 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 6 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:41:03,061 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 17 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:41:03,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-21 00:41:03,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2021-11-21 00:41:03,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 16 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 00:41:03,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-11-21 00:41:03,065 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 9 [2021-11-21 00:41:03,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:41:03,065 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-11-21 00:41:03,066 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 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 00:41:03,066 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-11-21 00:41:03,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-21 00:41:03,066 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:41:03,066 INFO L514 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1] [2021-11-21 00:41:03,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:41:03,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:41:03,267 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:41:03,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:41:03,268 INFO L85 PathProgramCache]: Analyzing trace with hash -431543096, now seen corresponding path program 3 times [2021-11-21 00:41:03,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:41:03,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626177446] [2021-11-21 00:41:03,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:41:03,269 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:41:03,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:41:03,480 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:41:03,481 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:41:03,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626177446] [2021-11-21 00:41:03,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [626177446] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:41:03,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1958294291] [2021-11-21 00:41:03,481 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:41:03,482 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:41:03,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:41:03,486 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:41:03,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:41:03,532 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:41:03,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:41:03,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-21 00:41:03,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:41:03,805 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:41:03,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:41:04,123 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:41:04,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1958294291] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:41:04,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1751415135] [2021-11-21 00:41:04,126 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-21 00:41:04,126 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:41:04,126 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:41:04,126 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:41:04,127 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:41:06,308 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:41:06,703 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:41:06,703 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:41:06,704 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 36 [2021-11-21 00:41:06,704 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000418778] [2021-11-21 00:41:06,704 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:41:06,705 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-21 00:41:06,705 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:41:06,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-21 00:41:06,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=1010, Unknown=0, NotChecked=0, Total=1640 [2021-11-21 00:41:06,707 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 37 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 36 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 00:41:07,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:41:07,020 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2021-11-21 00:41:07,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-21 00:41:07,021 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 36 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) Word has length 15 [2021-11-21 00:41:07,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:41:07,022 INFO L225 Difference]: With dead ends: 46 [2021-11-21 00:41:07,022 INFO L226 Difference]: Without dead ends: 30 [2021-11-21 00:41:07,024 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1001 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=938, Invalid=1714, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 00:41:07,025 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 12 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:41:07,026 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 17 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:41:07,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-21 00:41:07,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-11-21 00:41:07,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 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 00:41:07,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2021-11-21 00:41:07,033 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 15 [2021-11-21 00:41:07,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:41:07,034 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2021-11-21 00:41:07,034 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 36 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 00:41:07,034 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2021-11-21 00:41:07,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-21 00:41:07,036 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:41:07,036 INFO L514 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1] [2021-11-21 00:41:07,069 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:41:07,242 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:41:07,243 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:41:07,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:41:07,243 INFO L85 PathProgramCache]: Analyzing trace with hash 1633246600, now seen corresponding path program 4 times [2021-11-21 00:41:07,244 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:41:07,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2024784534] [2021-11-21 00:41:07,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:41:07,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:41:07,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:41:07,674 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:41:07,675 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:41:07,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2024784534] [2021-11-21 00:41:07,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2024784534] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:41:07,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1874087843] [2021-11-21 00:41:07,675 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:41:07,676 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:41:07,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:41:07,677 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:41:07,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:41:07,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:41:07,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-21 00:41:07,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:41:08,280 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:41:08,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:41:09,083 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:41:09,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1874087843] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:41:09,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [185901179] [2021-11-21 00:41:09,085 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-21 00:41:09,086 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:41:09,086 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:41:09,086 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:41:09,087 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:41:10,867 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:41:11,296 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:41:11,296 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:41:11,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 72 [2021-11-21 00:41:11,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565877647] [2021-11-21 00:41:11,297 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:41:11,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-21 00:41:11,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:41:11,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-21 00:41:11,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2394, Invalid=3458, Unknown=0, NotChecked=0, Total=5852 [2021-11-21 00:41:11,303 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 73 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 72 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 00:41:12,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:41:12,313 INFO L93 Difference]: Finished difference Result 82 states and 108 transitions. [2021-11-21 00:41:12,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-21 00:41:12,316 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 72 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) Word has length 27 [2021-11-21 00:41:12,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:41:12,318 INFO L225 Difference]: With dead ends: 82 [2021-11-21 00:41:12,318 INFO L226 Difference]: Without dead ends: 54 [2021-11-21 00:41:12,323 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3749 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3590, Invalid=6310, Unknown=0, NotChecked=0, Total=9900 [2021-11-21 00:41:12,324 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 6 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:41:12,324 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 25 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:41:12,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-21 00:41:12,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-11-21 00:41:12,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.0384615384615385) internal successors, (54), 52 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 00:41:12,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2021-11-21 00:41:12,340 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 27 [2021-11-21 00:41:12,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:41:12,341 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2021-11-21 00:41:12,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 72 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 00:41:12,342 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2021-11-21 00:41:12,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-21 00:41:12,344 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:41:12,344 INFO L514 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1] [2021-11-21 00:41:12,386 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:41:12,569 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:41:12,570 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:41:12,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:41:12,570 INFO L85 PathProgramCache]: Analyzing trace with hash 1554276104, now seen corresponding path program 5 times [2021-11-21 00:41:12,570 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:41:12,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496652272] [2021-11-21 00:41:12,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:41:12,571 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:41:12,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:41:13,894 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:41:13,895 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:41:13,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496652272] [2021-11-21 00:41:13,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496652272] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:41:13,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007486765] [2021-11-21 00:41:13,895 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:41:13,895 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:41:13,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:41:13,896 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:41:13,897 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:41:14,012 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-11-21 00:41:14,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:41:14,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-21 00:41:14,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:41:15,314 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:41:15,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:41:17,817 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:41:17,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2007486765] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:41:17,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1752173990] [2021-11-21 00:41:17,819 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-21 00:41:17,820 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:41:17,820 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:41:17,820 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:41:17,820 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:41:19,629 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:41:20,071 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:41:20,072 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:41:20,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 144 [2021-11-21 00:41:20,072 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828818471] [2021-11-21 00:41:20,073 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:41:20,073 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 145 states [2021-11-21 00:41:20,074 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:41:20,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 145 interpolants. [2021-11-21 00:41:20,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9378, Invalid=12674, Unknown=0, NotChecked=0, Total=22052 [2021-11-21 00:41:20,084 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand has 145 states, 145 states have (on average 1.0206896551724138) internal successors, (148), 144 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 00:41:22,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:41:22,931 INFO L93 Difference]: Finished difference Result 154 states and 204 transitions. [2021-11-21 00:41:22,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-11-21 00:41:22,932 INFO L78 Accepts]: Start accepts. Automaton has has 145 states, 145 states have (on average 1.0206896551724138) internal successors, (148), 144 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) Word has length 51 [2021-11-21 00:41:22,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:41:22,934 INFO L225 Difference]: With dead ends: 154 [2021-11-21 00:41:22,934 INFO L226 Difference]: Without dead ends: 102 [2021-11-21 00:41:22,941 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14429 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=14078, Invalid=24142, Unknown=0, NotChecked=0, Total=38220 [2021-11-21 00:41:22,942 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 6 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 169 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 169 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:41:22,942 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 25 Invalid, 290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [169 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:41:22,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-11-21 00:41:22,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2021-11-21 00:41:22,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 100 states have (on average 1.02) internal successors, (102), 100 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 00:41:22,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 102 transitions. [2021-11-21 00:41:22,956 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 102 transitions. Word has length 51 [2021-11-21 00:41:22,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:41:22,956 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 102 transitions. [2021-11-21 00:41:22,957 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 145 states, 145 states have (on average 1.0206896551724138) internal successors, (148), 144 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 00:41:22,957 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 102 transitions. [2021-11-21 00:41:22,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-21 00:41:22,960 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:41:22,961 INFO L514 BasicCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1] [2021-11-21 00:41:22,985 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:41:23,169 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 00:41:23,169 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:41:23,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:41:23,170 INFO L85 PathProgramCache]: Analyzing trace with hash -1760239096, now seen corresponding path program 6 times [2021-11-21 00:41:23,170 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:41:23,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112042986] [2021-11-21 00:41:23,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:41:23,171 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:41:23,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:41:26,831 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:41:26,832 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:41:26,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112042986] [2021-11-21 00:41:26,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112042986] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:41:26,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [678425119] [2021-11-21 00:41:26,832 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:41:26,832 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:41:26,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:41:26,833 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:41:26,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:41:26,961 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:41:26,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:41:26,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 97 conjunts are in the unsatisfiable core [2021-11-21 00:41:26,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:41:31,081 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:41:31,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:41:40,699 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:41:40,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [678425119] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:41:40,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [203851238] [2021-11-21 00:41:40,701 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-21 00:41:40,701 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:41:40,702 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:41:40,702 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:41:40,702 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:41:42,433 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:41:43,105 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:41:43,105 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:41:43,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 288 [2021-11-21 00:41:43,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101261372] [2021-11-21 00:41:43,106 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:41:43,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 289 states [2021-11-21 00:41:43,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:41:43,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 289 interpolants. [2021-11-21 00:41:43,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37170, Invalid=48386, Unknown=0, NotChecked=0, Total=85556 [2021-11-21 00:41:43,124 INFO L87 Difference]: Start difference. First operand 101 states and 102 transitions. Second operand has 289 states, 289 states have (on average 1.0103806228373702) internal successors, (292), 288 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:41:52,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:41:52,866 INFO L93 Difference]: Finished difference Result 298 states and 396 transitions. [2021-11-21 00:41:52,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 193 states. [2021-11-21 00:41:52,867 INFO L78 Accepts]: Start accepts. Automaton has has 289 states, 289 states have (on average 1.0103806228373702) internal successors, (292), 288 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 99 [2021-11-21 00:41:52,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:41:52,869 INFO L225 Difference]: With dead ends: 298 [2021-11-21 00:41:52,870 INFO L226 Difference]: Without dead ends: 198 [2021-11-21 00:41:52,881 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 386 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56525 ImplicationChecksByTransitivity, 25.7s TimeCoverageRelationStatistics Valid=55790, Invalid=94366, Unknown=0, NotChecked=0, Total=150156 [2021-11-21 00:41:52,882 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 6 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 309 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 309 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:41:52,883 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 17 Invalid, 551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [309 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:41:52,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-11-21 00:41:52,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 197. [2021-11-21 00:41:52,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 196 states have (on average 1.010204081632653) internal successors, (198), 196 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 00:41:52,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 198 transitions. [2021-11-21 00:41:52,904 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 198 transitions. Word has length 99 [2021-11-21 00:41:52,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:41:52,905 INFO L470 AbstractCegarLoop]: Abstraction has 197 states and 198 transitions. [2021-11-21 00:41:52,906 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 289 states, 289 states have (on average 1.0103806228373702) internal successors, (292), 288 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:41:52,906 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 198 transitions. [2021-11-21 00:41:52,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2021-11-21 00:41:52,912 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:41:52,912 INFO L514 BasicCegarLoop]: trace histogram [190, 1, 1, 1, 1, 1] [2021-11-21 00:41:52,933 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:41:53,114 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:41:53,115 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:41:53,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:41:53,115 INFO L85 PathProgramCache]: Analyzing trace with hash 1432348680, now seen corresponding path program 7 times [2021-11-21 00:41:53,115 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:41:53,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [441789873] [2021-11-21 00:41:53,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:41:53,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:41:53,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:42:06,535 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:42:06,535 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:42:06,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [441789873] [2021-11-21 00:42:06,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [441789873] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:42:06,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [717607334] [2021-11-21 00:42:06,536 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:42:06,536 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:42:06,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:42:06,569 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:42:06,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:42:06,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:42:06,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 819 conjuncts, 193 conjunts are in the unsatisfiable core [2021-11-21 00:42:06,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:42:21,555 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:42:21,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:43:01,003 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:43:01,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [717607334] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:43:01,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [864315732] [2021-11-21 00:43:01,005 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-21 00:43:01,005 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:43:01,006 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:43:01,006 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:43:01,006 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:43:02,722 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:43:03,605 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:43:03,605 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:43:03,606 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193, 193] total 576 [2021-11-21 00:43:03,606 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387277548] [2021-11-21 00:43:03,606 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:43:03,607 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 577 states [2021-11-21 00:43:03,607 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:43:03,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 577 interpolants. [2021-11-21 00:43:03,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148050, Invalid=188930, Unknown=0, NotChecked=0, Total=336980 [2021-11-21 00:43:03,639 INFO L87 Difference]: Start difference. First operand 197 states and 198 transitions. Second operand has 577 states, 577 states have (on average 1.0051993067590987) internal successors, (580), 576 states have internal predecessors, (580), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:43:42,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:43:42,903 INFO L93 Difference]: Finished difference Result 586 states and 780 transitions. [2021-11-21 00:43:42,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 385 states. [2021-11-21 00:43:42,904 INFO L78 Accepts]: Start accepts. Automaton has has 577 states, 577 states have (on average 1.0051993067590987) internal successors, (580), 576 states have internal predecessors, (580), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 195 [2021-11-21 00:43:42,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:43:42,907 INFO L225 Difference]: With dead ends: 586 [2021-11-21 00:43:42,908 INFO L226 Difference]: Without dead ends: 390 [2021-11-21 00:43:42,940 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 967 GetRequests, 197 SyntacticMatches, 0 SemanticMatches, 770 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223661 ImplicationChecksByTransitivity, 101.0s TimeCoverageRelationStatistics Valid=222158, Invalid=373054, Unknown=0, NotChecked=0, Total=595212 [2021-11-21 00:43:42,941 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 6 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 499 mSolverCounterSat, 602 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 1101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 602 IncrementalHoareTripleChecker+Valid, 499 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:43:42,941 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 49 Invalid, 1101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [602 Valid, 499 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 00:43:42,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2021-11-21 00:43:42,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 389. [2021-11-21 00:43:42,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 389 states, 388 states have (on average 1.0051546391752577) internal successors, (390), 388 states have internal predecessors, (390), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:43:42,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 389 states to 389 states and 390 transitions. [2021-11-21 00:43:42,990 INFO L78 Accepts]: Start accepts. Automaton has 389 states and 390 transitions. Word has length 195 [2021-11-21 00:43:42,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:43:42,990 INFO L470 AbstractCegarLoop]: Abstraction has 389 states and 390 transitions. [2021-11-21 00:43:42,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 577 states, 577 states have (on average 1.0051993067590987) internal successors, (580), 576 states have internal predecessors, (580), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:43:42,992 INFO L276 IsEmpty]: Start isEmpty. Operand 389 states and 390 transitions. [2021-11-21 00:43:43,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 388 [2021-11-21 00:43:43,000 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:43:43,000 INFO L514 BasicCegarLoop]: trace histogram [382, 1, 1, 1, 1, 1] [2021-11-21 00:43:43,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:43:43,214 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:43:43,215 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:43:43,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:43:43,215 INFO L85 PathProgramCache]: Analyzing trace with hash -945949688, now seen corresponding path program 8 times [2021-11-21 00:43:43,215 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:43:43,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640455876] [2021-11-21 00:43:43,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:43:43,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:43:45,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:44:36,753 INFO L134 CoverageAnalysis]: Checked inductivity of 73153 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:44:36,754 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:44:36,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640455876] [2021-11-21 00:44:36,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640455876] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:44:36,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [629984936] [2021-11-21 00:44:36,754 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:44:36,755 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:44:36,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:44:36,764 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:44:36,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:44:38,906 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 192 check-sat command(s) [2021-11-21 00:44:38,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:44:38,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 1587 conjuncts, 385 conjunts are in the unsatisfiable core [2021-11-21 00:44:38,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:45:34,102 INFO L134 CoverageAnalysis]: Checked inductivity of 73153 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:45:34,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:48:15,250 INFO L134 CoverageAnalysis]: Checked inductivity of 73153 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:48:15,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [629984936] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:48:15,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1363047439] [2021-11-21 00:48:15,252 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-21 00:48:15,252 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:48:15,253 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:48:15,253 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:48:15,253 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:48:16,995 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:48:18,534 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:48:18,535 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:48:18,535 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [385, 385, 385] total 1152 [2021-11-21 00:48:18,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209470864] [2021-11-21 00:48:18,535 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:48:18,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 1153 states [2021-11-21 00:48:18,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:48:18,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 1153 interpolants. [2021-11-21 00:48:18,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=590994, Invalid=746498, Unknown=0, NotChecked=0, Total=1337492 [2021-11-21 00:48:18,684 INFO L87 Difference]: Start difference. First operand 389 states and 390 transitions. Second operand has 1153 states, 1153 states have (on average 1.002601908065915) internal successors, (1156), 1152 states have internal predecessors, (1156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:51:16,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:51:16,720 INFO L93 Difference]: Finished difference Result 1162 states and 1548 transitions. [2021-11-21 00:51:16,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 769 states. [2021-11-21 00:51:16,723 INFO L78 Accepts]: Start accepts. Automaton has has 1153 states, 1153 states have (on average 1.002601908065915) internal successors, (1156), 1152 states have internal predecessors, (1156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 387 [2021-11-21 00:51:16,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:51:16,730 INFO L225 Difference]: With dead ends: 1162 [2021-11-21 00:51:16,730 INFO L226 Difference]: Without dead ends: 774 [2021-11-21 00:51:16,912 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1927 GetRequests, 389 SyntacticMatches, 0 SemanticMatches, 1538 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 889709 ImplicationChecksByTransitivity, 415.3s TimeCoverageRelationStatistics Valid=886670, Invalid=1483390, Unknown=0, NotChecked=0, Total=2370060 [2021-11-21 00:51:16,913 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 12 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 973 mSolverCounterSat, 1932 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 2905 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1932 IncrementalHoareTripleChecker+Valid, 973 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:51:16,914 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 45 Invalid, 2905 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1932 Valid, 973 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-21 00:51:16,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 774 states. [2021-11-21 00:51:16,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 774 to 773. [2021-11-21 00:51:16,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 773 states, 772 states have (on average 1.0025906735751295) internal successors, (774), 772 states have internal predecessors, (774), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:51:16,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 773 states to 773 states and 774 transitions. [2021-11-21 00:51:16,969 INFO L78 Accepts]: Start accepts. Automaton has 773 states and 774 transitions. Word has length 387 [2021-11-21 00:51:16,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:51:16,970 INFO L470 AbstractCegarLoop]: Abstraction has 773 states and 774 transitions. [2021-11-21 00:51:16,973 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 1153 states, 1153 states have (on average 1.002601908065915) internal successors, (1156), 1152 states have internal predecessors, (1156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:51:16,973 INFO L276 IsEmpty]: Start isEmpty. Operand 773 states and 774 transitions. [2021-11-21 00:51:17,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 772 [2021-11-21 00:51:17,001 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:51:17,002 INFO L514 BasicCegarLoop]: trace histogram [766, 1, 1, 1, 1, 1] [2021-11-21 00:51:17,038 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-21 00:51:17,222 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_797e1e47-0e04-472d-b7b6-5197df93544c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:51:17,223 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:51:17,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:51:17,223 INFO L85 PathProgramCache]: Analyzing trace with hash 45747208, now seen corresponding path program 9 times [2021-11-21 00:51:17,223 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:51:17,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065597873] [2021-11-21 00:51:17,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:51:17,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:51:24,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat