./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum3.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_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/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_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum3.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/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_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/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 d3267df59902b667587c98ecbe021c99cc3d2a5e5866fbd08ee1fb3133370aa4 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:27:06,688 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:27:06,690 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:27:06,720 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:27:06,721 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:27:06,722 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:27:06,724 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:27:06,727 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:27:06,729 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:27:06,730 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:27:06,732 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:27:06,733 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:27:06,734 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:27:06,735 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:27:06,737 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:27:06,739 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:27:06,740 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:27:06,741 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:27:06,744 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:27:06,746 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:27:06,748 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:27:06,750 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:27:06,752 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:27:06,753 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:27:06,757 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:27:06,757 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:27:06,758 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:27:06,759 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:27:06,760 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:27:06,761 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:27:06,761 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:27:06,762 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:27:06,764 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:27:06,765 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:27:06,766 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:27:06,766 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:27:06,767 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:27:06,767 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:27:06,767 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:27:06,768 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:27:06,769 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:27:06,770 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:27:06,795 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:27:06,795 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:27:06,796 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:27:06,796 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:27:06,797 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:27:06,797 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:27:06,797 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:27:06,797 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:27:06,798 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:27:06,798 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:27:06,798 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:27:06,798 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:27:06,799 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:27:06,799 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:27:06,799 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:27:06,799 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:27:06,800 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:27:06,800 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:27:06,801 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:27:06,801 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:27:06,801 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:27:06,801 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:27:06,802 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:27:06,802 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:27:06,802 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:27:06,802 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:27:06,802 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:27:06,803 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:27:06,803 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:27:06,803 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:27:06,803 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:27:06,804 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:27:06,804 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:27:06,804 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:27:06,804 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:27:06,805 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:27:06,805 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:27:06,805 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:27:06,805 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:27:06,806 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:27:06,806 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:27:06,806 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_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d3267df59902b667587c98ecbe021c99cc3d2a5e5866fbd08ee1fb3133370aa4 [2021-11-21 01:27:07,084 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:27:07,111 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:27:07,114 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:27:07,116 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:27:07,116 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:27:07,118 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-crafted/zero_sum3.c [2021-11-21 01:27:07,202 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/data/89f81373d/c01a2e70767a4526969ef1b0c941422b/FLAGcede2533b [2021-11-21 01:27:07,746 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:27:07,746 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/sv-benchmarks/c/array-crafted/zero_sum3.c [2021-11-21 01:27:07,761 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/data/89f81373d/c01a2e70767a4526969ef1b0c941422b/FLAGcede2533b [2021-11-21 01:27:08,072 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/data/89f81373d/c01a2e70767a4526969ef1b0c941422b [2021-11-21 01:27:08,074 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:27:08,076 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:27:08,078 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:27:08,078 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:27:08,082 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:27:08,083 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:27:08" (1/1) ... [2021-11-21 01:27:08,084 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4bdd0926 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:27:08, skipping insertion in model container [2021-11-21 01:27:08,084 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:27:08" (1/1) ... [2021-11-21 01:27:08,098 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:27:08,113 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:27:08,269 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_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/sv-benchmarks/c/array-crafted/zero_sum3.c[400,413] [2021-11-21 01:27:08,289 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:27:08,298 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:27:08,308 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_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/sv-benchmarks/c/array-crafted/zero_sum3.c[400,413] [2021-11-21 01:27:08,317 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:27:08,330 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:27:08,330 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:27:08 WrapperNode [2021-11-21 01:27:08,330 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:27:08,332 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:27:08,332 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:27:08,332 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:27:08,340 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:27:08" (1/1) ... [2021-11-21 01:27:08,347 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:27:08" (1/1) ... [2021-11-21 01:27:08,370 INFO L137 Inliner]: procedures = 15, calls = 17, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 105 [2021-11-21 01:27:08,370 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:27:08,371 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:27:08,371 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:27:08,371 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:27:08,380 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:27:08" (1/1) ... [2021-11-21 01:27:08,380 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:27:08" (1/1) ... [2021-11-21 01:27:08,382 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:27:08" (1/1) ... [2021-11-21 01:27:08,383 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:27:08" (1/1) ... [2021-11-21 01:27:08,389 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:27:08" (1/1) ... [2021-11-21 01:27:08,395 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:27:08" (1/1) ... [2021-11-21 01:27:08,396 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:27:08" (1/1) ... [2021-11-21 01:27:08,399 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:27:08,400 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:27:08,400 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:27:08,400 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:27:08,401 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:27:08" (1/1) ... [2021-11-21 01:27:08,416 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:27:08,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:08,447 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:27:08,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:27:08,487 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:27:08,487 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:27:08,487 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:27:08,488 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:27:08,488 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:27:08,488 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:27:08,488 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:27:08,488 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:27:08,564 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:27:08,566 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:27:08,736 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:27:08,781 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:27:08,781 INFO L301 CfgBuilder]: Removed 7 assume(true) statements. [2021-11-21 01:27:08,784 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:27:08 BoogieIcfgContainer [2021-11-21 01:27:08,784 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:27:08,786 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:27:08,786 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:27:08,789 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:27:08,790 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:27:08" (1/3) ... [2021-11-21 01:27:08,790 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a214e33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:27:08, skipping insertion in model container [2021-11-21 01:27:08,791 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:27:08" (2/3) ... [2021-11-21 01:27:08,791 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a214e33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:27:08, skipping insertion in model container [2021-11-21 01:27:08,791 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:27:08" (3/3) ... [2021-11-21 01:27:08,792 INFO L111 eAbstractionObserver]: Analyzing ICFG zero_sum3.c [2021-11-21 01:27:08,798 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:27:08,798 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:27:08,867 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:27:08,875 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 01:27:08,876 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:27:08,924 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:08,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 01:27:08,928 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:08,929 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:27:08,930 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:08,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:08,935 INFO L85 PathProgramCache]: Analyzing trace with hash 797261710, now seen corresponding path program 1 times [2021-11-21 01:27:08,946 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:08,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [406001330] [2021-11-21 01:27:08,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:08,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:09,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:09,132 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:09,132 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:09,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [406001330] [2021-11-21 01:27:09,134 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [406001330] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:27:09,134 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:27:09,134 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:27:09,136 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058467012] [2021-11-21 01:27:09,137 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:27:09,141 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:27:09,141 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:09,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:27:09,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:27:09,174 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:09,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:09,244 INFO L93 Difference]: Finished difference Result 28 states and 43 transitions. [2021-11-21 01:27:09,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:27:09,247 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-21 01:27:09,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:09,255 INFO L225 Difference]: With dead ends: 28 [2021-11-21 01:27:09,255 INFO L226 Difference]: Without dead ends: 13 [2021-11-21 01:27:09,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:27:09,263 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:09,264 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:27:09,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-21 01:27:09,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-21 01:27:09,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:09,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 19 transitions. [2021-11-21 01:27:09,297 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 19 transitions. Word has length 11 [2021-11-21 01:27:09,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:09,298 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 19 transitions. [2021-11-21 01:27:09,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:09,298 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 19 transitions. [2021-11-21 01:27:09,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-21 01:27:09,299 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:09,299 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:27:09,300 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:27:09,300 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:09,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:09,301 INFO L85 PathProgramCache]: Analyzing trace with hash -800631237, now seen corresponding path program 1 times [2021-11-21 01:27:09,314 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:09,315 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235732927] [2021-11-21 01:27:09,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:09,315 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:09,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:09,377 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:27:09,378 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:09,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235732927] [2021-11-21 01:27:09,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1235732927] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:27:09,379 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:27:09,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:27:09,380 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717759701] [2021-11-21 01:27:09,380 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:27:09,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:27:09,382 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:09,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:27:09,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:27:09,384 INFO L87 Difference]: Start difference. First operand 13 states and 19 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:09,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:09,485 INFO L93 Difference]: Finished difference Result 27 states and 43 transitions. [2021-11-21 01:27:09,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:27:09,486 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 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) Word has length 12 [2021-11-21 01:27:09,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:09,487 INFO L225 Difference]: With dead ends: 27 [2021-11-21 01:27:09,487 INFO L226 Difference]: Without dead ends: 19 [2021-11-21 01:27:09,488 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 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 01:27:09,490 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:09,491 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 5 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:27:09,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-21 01:27:09,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-11-21 01:27:09,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 18 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:09,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 25 transitions. [2021-11-21 01:27:09,498 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 25 transitions. Word has length 12 [2021-11-21 01:27:09,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:09,499 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 25 transitions. [2021-11-21 01:27:09,499 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:09,499 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 25 transitions. [2021-11-21 01:27:09,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-21 01:27:09,500 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:09,500 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:27:09,501 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 01:27:09,501 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:09,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:09,502 INFO L85 PathProgramCache]: Analyzing trace with hash -801296507, now seen corresponding path program 1 times [2021-11-21 01:27:09,502 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:09,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445924442] [2021-11-21 01:27:09,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:09,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:09,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:09,605 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:27:09,606 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:09,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445924442] [2021-11-21 01:27:09,606 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [445924442] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:09,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [887083882] [2021-11-21 01:27:09,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:09,609 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:09,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:09,626 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:09,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:27:09,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:09,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:27:09,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:09,892 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:27:09,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:09,966 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:27:09,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [887083882] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:09,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [536230046] [2021-11-21 01:27:10,001 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:27:10,002 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:10,007 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:10,015 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:10,016 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:10,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:10,198 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:27:10,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:27:10,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:10,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:27:10,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:10,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:27:10,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:10,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:10,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:10,630 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:27:10,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-21 01:27:10,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:27:12,101 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:12,254 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:12,255 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:12,255 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-21 01:27:12,255 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309795441] [2021-11-21 01:27:12,255 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:12,256 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:27:12,256 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:12,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:27:12,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-21 01:27:12,257 INFO L87 Difference]: Start difference. First operand 19 states and 25 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:12,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:12,327 INFO L93 Difference]: Finished difference Result 35 states and 47 transitions. [2021-11-21 01:27:12,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:27:12,328 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-21 01:27:12,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:12,329 INFO L225 Difference]: With dead ends: 35 [2021-11-21 01:27:12,329 INFO L226 Difference]: Without dead ends: 20 [2021-11-21 01:27:12,329 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-21 01:27:12,331 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:12,332 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:27:12,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-21 01:27:12,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-21 01:27:12,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.368421052631579) internal successors, (26), 19 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:12,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 26 transitions. [2021-11-21 01:27:12,337 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 26 transitions. Word has length 18 [2021-11-21 01:27:12,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:12,337 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 26 transitions. [2021-11-21 01:27:12,337 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:12,338 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 26 transitions. [2021-11-21 01:27:12,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-21 01:27:12,338 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:12,338 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:27:12,380 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:12,539 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:12,539 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:12,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:12,540 INFO L85 PathProgramCache]: Analyzing trace with hash -1102992328, now seen corresponding path program 2 times [2021-11-21 01:27:12,540 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:12,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368423714] [2021-11-21 01:27:12,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:12,540 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:12,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:12,600 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 01:27:12,600 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:12,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368423714] [2021-11-21 01:27:12,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1368423714] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:12,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [900436089] [2021-11-21 01:27:12,601 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:27:12,601 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:12,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:12,616 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:12,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:27:12,668 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:27:12,668 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:27:12,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:27:12,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:12,726 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 01:27:12,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:12,773 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 01:27:12,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [900436089] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:12,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1283834189] [2021-11-21 01:27:12,778 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:27:12,778 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:12,779 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:12,779 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:12,779 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:12,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:12,868 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 01:27:12,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 01:27:12,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:12,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:12,945 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:27:12,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:27:13,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:13,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:27:13,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:13,149 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:13,172 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:27:13,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-21 01:27:13,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:27:14,530 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:14,701 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:14,701 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:14,701 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-21 01:27:14,701 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [264637377] [2021-11-21 01:27:14,702 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:14,702 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:27:14,702 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:14,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:27:14,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:27:14,703 INFO L87 Difference]: Start difference. First operand 20 states and 26 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:14,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:14,783 INFO L93 Difference]: Finished difference Result 39 states and 55 transitions. [2021-11-21 01:27:14,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:27:14,784 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-21 01:27:14,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:14,784 INFO L225 Difference]: With dead ends: 39 [2021-11-21 01:27:14,784 INFO L226 Difference]: Without dead ends: 26 [2021-11-21 01:27:14,785 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:27:14,786 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 10 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:14,787 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 11 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:27:14,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-21 01:27:14,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-21 01:27:14,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.28) internal successors, (32), 25 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:14,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2021-11-21 01:27:14,793 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 19 [2021-11-21 01:27:14,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:14,793 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2021-11-21 01:27:14,793 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:14,793 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2021-11-21 01:27:14,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-21 01:27:14,794 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:14,794 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:27:14,832 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:15,007 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:15,008 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:15,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:15,008 INFO L85 PathProgramCache]: Analyzing trace with hash 196438190, now seen corresponding path program 3 times [2021-11-21 01:27:15,009 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:15,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [401816666] [2021-11-21 01:27:15,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:15,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:15,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:15,932 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:15,933 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:15,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [401816666] [2021-11-21 01:27:15,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [401816666] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:15,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [898781108] [2021-11-21 01:27:15,933 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:27:15,933 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:15,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:15,936 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:15,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:27:16,004 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:27:16,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:27:16,006 WARN L261 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-21 01:27:16,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:16,505 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 01:27:16,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:16,825 INFO L354 Elim1Store]: treesize reduction 39, result has 52.4 percent of original size [2021-11-21 01:27:16,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 52 [2021-11-21 01:27:16,920 INFO L354 Elim1Store]: treesize reduction 73, result has 11.0 percent of original size [2021-11-21 01:27:16,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 17 [2021-11-21 01:27:16,963 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 01:27:16,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [898781108] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:16,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [206609693] [2021-11-21 01:27:16,966 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:27:16,967 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:16,967 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:16,967 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:16,967 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:17,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:17,058 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 01:27:17,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 01:27:17,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:17,113 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:27:17,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:27:17,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:17,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:27:17,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:17,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:17,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:17,321 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:27:17,322 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-21 01:27:17,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:27:18,524 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:18,761 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:18,761 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:18,761 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 10] total 19 [2021-11-21 01:27:18,762 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173212336] [2021-11-21 01:27:18,762 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:18,762 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-21 01:27:18,762 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:18,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-21 01:27:18,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=484, Unknown=0, NotChecked=0, Total=552 [2021-11-21 01:27:18,763 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 19 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 19 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:19,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:19,041 INFO L93 Difference]: Finished difference Result 45 states and 56 transitions. [2021-11-21 01:27:19,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 01:27:19,041 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 19 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-21 01:27:19,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:19,042 INFO L225 Difference]: With dead ends: 45 [2021-11-21 01:27:19,042 INFO L226 Difference]: Without dead ends: 42 [2021-11-21 01:27:19,043 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 50 SyntacticMatches, 25 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=74, Invalid=526, Unknown=0, NotChecked=0, Total=600 [2021-11-21 01:27:19,044 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:19,044 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 23 Invalid, 320 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:27:19,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-21 01:27:19,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-11-21 01:27:19,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 39 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:19,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 51 transitions. [2021-11-21 01:27:19,052 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 51 transitions. Word has length 25 [2021-11-21 01:27:19,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:19,053 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 51 transitions. [2021-11-21 01:27:19,053 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 19 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:19,053 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 51 transitions. [2021-11-21 01:27:19,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 01:27:19,054 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:19,054 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:27:19,084 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:19,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:19,268 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:19,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:19,268 INFO L85 PathProgramCache]: Analyzing trace with hash 261601827, now seen corresponding path program 4 times [2021-11-21 01:27:19,269 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:19,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134792528] [2021-11-21 01:27:19,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:19,269 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:19,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:19,341 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:27:19,341 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:19,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134792528] [2021-11-21 01:27:19,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2134792528] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:19,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355179068] [2021-11-21 01:27:19,341 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:27:19,342 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:19,342 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:19,343 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:19,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:27:19,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:19,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:27:19,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:19,508 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:27:19,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:19,594 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:27:19,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1355179068] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:19,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [497810037] [2021-11-21 01:27:19,600 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:27:19,600 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:19,601 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:19,601 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:19,601 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:19,662 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:19,691 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:27:19,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:27:19,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:19,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:27:19,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:19,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:27:19,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:19,907 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:19,930 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:27:19,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-21 01:27:20,389 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:27:21,374 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:21,523 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:21,523 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:21,523 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2021-11-21 01:27:21,523 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815502519] [2021-11-21 01:27:21,523 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:21,524 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 01:27:21,524 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:21,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 01:27:21,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2021-11-21 01:27:21,525 INFO L87 Difference]: Start difference. First operand 40 states and 51 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:21,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:21,676 INFO L93 Difference]: Finished difference Result 78 states and 100 transitions. [2021-11-21 01:27:21,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 01:27:21,677 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-21 01:27:21,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:21,677 INFO L225 Difference]: With dead ends: 78 [2021-11-21 01:27:21,678 INFO L226 Difference]: Without dead ends: 41 [2021-11-21 01:27:21,679 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:27:21,680 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:21,680 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 13 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:27:21,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-21 01:27:21,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-21 01:27:21,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:21,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 52 transitions. [2021-11-21 01:27:21,689 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 52 transitions. Word has length 26 [2021-11-21 01:27:21,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:21,689 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 52 transitions. [2021-11-21 01:27:21,690 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:21,690 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 52 transitions. [2021-11-21 01:27:21,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-21 01:27:21,691 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:21,691 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:27:21,734 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:21,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:21,916 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:21,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:21,916 INFO L85 PathProgramCache]: Analyzing trace with hash -1959144490, now seen corresponding path program 5 times [2021-11-21 01:27:21,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:21,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996552716] [2021-11-21 01:27:21,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:21,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:21,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:21,987 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-21 01:27:21,988 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:21,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996552716] [2021-11-21 01:27:21,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996552716] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:21,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1063192606] [2021-11-21 01:27:21,989 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:27:21,989 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:21,989 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:22,000 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:22,001 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:27:22,050 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:27:22,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:27:22,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:27:22,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:22,166 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-21 01:27:22,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:22,257 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-21 01:27:22,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1063192606] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:22,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1819208344] [2021-11-21 01:27:22,260 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:27:22,260 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:22,261 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:22,261 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:22,261 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:22,314 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:22,338 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 01:27:22,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 01:27:22,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:22,399 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:27:22,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:27:22,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:22,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:27:22,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:22,570 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:22,589 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:27:22,589 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-21 01:27:22,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:27:23,810 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:23,944 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:23,945 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:23,945 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-21 01:27:23,945 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453206400] [2021-11-21 01:27:23,945 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:23,946 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 01:27:23,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:23,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 01:27:23,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-11-21 01:27:23,947 INFO L87 Difference]: Start difference. First operand 41 states and 52 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:24,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:24,076 INFO L93 Difference]: Finished difference Result 62 states and 82 transitions. [2021-11-21 01:27:24,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 01:27:24,077 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have 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 01:27:24,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:24,078 INFO L225 Difference]: With dead ends: 62 [2021-11-21 01:27:24,078 INFO L226 Difference]: Without dead ends: 33 [2021-11-21 01:27:24,078 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=108, Invalid=398, Unknown=0, NotChecked=0, Total=506 [2021-11-21 01:27:24,079 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 39 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:24,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 13 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:27:24,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-21 01:27:24,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-11-21 01:27:24,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.21875) internal successors, (39), 32 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:24,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2021-11-21 01:27:24,086 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 27 [2021-11-21 01:27:24,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:24,086 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2021-11-21 01:27:24,087 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:24,087 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2021-11-21 01:27:24,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-21 01:27:24,088 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:24,088 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:27:24,112 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:24,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:24,300 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:24,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:24,300 INFO L85 PathProgramCache]: Analyzing trace with hash 1855861477, now seen corresponding path program 6 times [2021-11-21 01:27:24,300 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:24,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610076928] [2021-11-21 01:27:24,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:24,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:24,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:25,683 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:25,683 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:25,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610076928] [2021-11-21 01:27:25,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610076928] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:25,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [749039030] [2021-11-21 01:27:25,684 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:27:25,684 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:25,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:25,686 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:25,687 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:27:25,740 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:27:25,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:27:25,742 WARN L261 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 79 conjunts are in the unsatisfiable core [2021-11-21 01:27:25,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:26,580 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:27:26,581 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:27,218 INFO L354 Elim1Store]: treesize reduction 114, result has 46.0 percent of original size [2021-11-21 01:27:27,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 53 treesize of output 108 [2021-11-21 01:27:27,563 INFO L354 Elim1Store]: treesize reduction 198, result has 6.2 percent of original size [2021-11-21 01:27:27,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 23 [2021-11-21 01:27:27,630 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:27:27,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [749039030] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:27,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [96808155] [2021-11-21 01:27:27,633 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:27:27,633 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:27,633 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:27,634 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:27,634 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:27,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:27,722 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 01:27:27,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 01:27:27,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:27,782 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:27:27,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:27:27,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:27,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:27:27,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:27,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:27,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:27,970 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:27:27,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-21 01:27:28,185 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:27:29,034 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:29,376 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:29,377 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:29,377 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 12, 12] total 41 [2021-11-21 01:27:29,377 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910727219] [2021-11-21 01:27:29,377 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:29,377 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-21 01:27:29,377 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:29,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-21 01:27:29,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1909, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 01:27:29,379 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 41 states, 41 states have (on average 2.048780487804878) internal successors, (84), 41 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:31,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:31,276 INFO L93 Difference]: Finished difference Result 95 states and 116 transitions. [2021-11-21 01:27:31,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-21 01:27:31,277 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.048780487804878) internal successors, (84), 41 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-21 01:27:31,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:31,279 INFO L225 Difference]: With dead ends: 95 [2021-11-21 01:27:31,279 INFO L226 Difference]: Without dead ends: 92 [2021-11-21 01:27:31,281 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 63 SyntacticMatches, 18 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1341 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=365, Invalid=3795, Unknown=0, NotChecked=0, Total=4160 [2021-11-21 01:27:31,282 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 18 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 785 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 946 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 785 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:31,282 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 78 Invalid, 946 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 785 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 01:27:31,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-21 01:27:31,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 66. [2021-11-21 01:27:31,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.2769230769230768) internal successors, (83), 65 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:31,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 83 transitions. [2021-11-21 01:27:31,297 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 83 transitions. Word has length 32 [2021-11-21 01:27:31,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:31,298 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 83 transitions. [2021-11-21 01:27:31,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.048780487804878) internal successors, (84), 41 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:31,298 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 83 transitions. [2021-11-21 01:27:31,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-21 01:27:31,299 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:31,300 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:27:31,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:31,515 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:31,516 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:31,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:31,516 INFO L85 PathProgramCache]: Analyzing trace with hash 1696714872, now seen corresponding path program 7 times [2021-11-21 01:27:31,516 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:31,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [680858980] [2021-11-21 01:27:31,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:31,517 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:31,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:31,604 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 01:27:31,604 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:31,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [680858980] [2021-11-21 01:27:31,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [680858980] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:31,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [868641636] [2021-11-21 01:27:31,605 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:27:31,605 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:31,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:31,606 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:31,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:27:31,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:31,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:27:31,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:31,761 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 01:27:31,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:31,830 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 01:27:31,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [868641636] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:31,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [651886544] [2021-11-21 01:27:31,832 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:27:31,832 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:31,832 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:31,832 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:31,832 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:31,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:31,912 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:27:31,912 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:27:31,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:31,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:27:31,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:31,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:27:32,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:32,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:32,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:32,151 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:27:32,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-21 01:27:32,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:27:33,119 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:33,286 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:33,286 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:33,286 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-21 01:27:33,286 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859205722] [2021-11-21 01:27:33,287 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:33,287 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 01:27:33,287 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:33,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 01:27:33,288 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:27:33,288 INFO L87 Difference]: Start difference. First operand 66 states and 83 transitions. Second operand has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:33,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:33,487 INFO L93 Difference]: Finished difference Result 123 states and 152 transitions. [2021-11-21 01:27:33,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 01:27:33,488 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-21 01:27:33,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:33,490 INFO L225 Difference]: With dead ends: 123 [2021-11-21 01:27:33,490 INFO L226 Difference]: Without dead ends: 61 [2021-11-21 01:27:33,491 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=131, Invalid=519, Unknown=0, NotChecked=0, Total=650 [2021-11-21 01:27:33,494 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:33,495 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 11 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:27:33,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-21 01:27:33,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-11-21 01:27:33,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.25) internal successors, (75), 60 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:33,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 75 transitions. [2021-11-21 01:27:33,514 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 75 transitions. Word has length 33 [2021-11-21 01:27:33,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:33,514 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 75 transitions. [2021-11-21 01:27:33,515 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:33,515 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 75 transitions. [2021-11-21 01:27:33,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-21 01:27:33,518 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:33,518 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:27:33,559 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:33,743 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-21 01:27:33,744 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:33,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:33,744 INFO L85 PathProgramCache]: Analyzing trace with hash -1894516891, now seen corresponding path program 8 times [2021-11-21 01:27:33,744 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:33,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324353274] [2021-11-21 01:27:33,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:33,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:33,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:33,839 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-21 01:27:33,839 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:33,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1324353274] [2021-11-21 01:27:33,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1324353274] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:33,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [82828162] [2021-11-21 01:27:33,840 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:27:33,840 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:33,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:33,844 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:33,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:27:33,915 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:27:33,916 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:27:33,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:27:33,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:34,075 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-21 01:27:34,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:34,192 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-21 01:27:34,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [82828162] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:34,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [115408563] [2021-11-21 01:27:34,196 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:27:34,197 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:34,197 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:34,197 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:34,198 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:34,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:34,278 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 01:27:34,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 01:27:34,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:34,336 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:27:34,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:27:34,402 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:34,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:27:34,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:34,497 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:34,524 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:27:34,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-21 01:27:34,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:27:35,773 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:35,956 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:35,956 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:35,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-21 01:27:35,956 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605066941] [2021-11-21 01:27:35,956 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:35,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 01:27:35,957 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:35,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 01:27:35,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:27:35,958 INFO L87 Difference]: Start difference. First operand 61 states and 75 transitions. Second operand has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:36,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:36,132 INFO L93 Difference]: Finished difference Result 86 states and 109 transitions. [2021-11-21 01:27:36,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 01:27:36,133 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-21 01:27:36,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:36,134 INFO L225 Difference]: With dead ends: 86 [2021-11-21 01:27:36,134 INFO L226 Difference]: Without dead ends: 45 [2021-11-21 01:27:36,135 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=153, Invalid=549, Unknown=0, NotChecked=0, Total=702 [2021-11-21 01:27:36,136 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 37 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:36,136 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 11 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:27:36,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-21 01:27:36,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 40. [2021-11-21 01:27:36,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1794871794871795) internal successors, (46), 39 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:36,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2021-11-21 01:27:36,145 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 34 [2021-11-21 01:27:36,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:36,145 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2021-11-21 01:27:36,145 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:36,146 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2021-11-21 01:27:36,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-21 01:27:36,147 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:36,147 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:27:36,188 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:36,363 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:36,364 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:36,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:36,364 INFO L85 PathProgramCache]: Analyzing trace with hash 2066954702, now seen corresponding path program 9 times [2021-11-21 01:27:36,364 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:36,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428292379] [2021-11-21 01:27:36,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:36,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:36,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:38,167 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:38,167 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:38,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428292379] [2021-11-21 01:27:38,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1428292379] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:38,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1659189923] [2021-11-21 01:27:38,168 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:27:38,168 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:38,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:38,186 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:38,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:27:38,250 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:27:38,250 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:27:38,252 WARN L261 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 103 conjunts are in the unsatisfiable core [2021-11-21 01:27:38,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:39,430 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:27:39,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:40,402 INFO L354 Elim1Store]: treesize reduction 227, result has 43.3 percent of original size [2021-11-21 01:27:40,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 70 treesize of output 186 [2021-11-21 01:27:40,950 INFO L354 Elim1Store]: treesize reduction 383, result has 4.3 percent of original size [2021-11-21 01:27:40,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 69 treesize of output 29 [2021-11-21 01:27:41,015 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:27:41,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1659189923] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:41,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1159440601] [2021-11-21 01:27:41,017 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:27:41,017 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:41,018 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:41,018 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:41,018 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:41,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:41,113 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:27:41,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:27:41,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:41,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:27:41,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:41,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:27:41,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:41,318 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:41,343 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:27:41,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-21 01:27:41,759 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:27:42,604 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:42,924 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:42,924 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:42,924 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 14, 14] total 53 [2021-11-21 01:27:42,924 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778904313] [2021-11-21 01:27:42,924 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:42,925 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-21 01:27:42,925 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:42,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-21 01:27:42,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=3090, Unknown=0, NotChecked=0, Total=3306 [2021-11-21 01:27:42,927 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 53 states, 53 states have (on average 1.9433962264150944) internal successors, (103), 53 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:46,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:46,165 INFO L93 Difference]: Finished difference Result 103 states and 123 transitions. [2021-11-21 01:27:46,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-21 01:27:46,166 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.9433962264150944) internal successors, (103), 53 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-21 01:27:46,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:46,167 INFO L225 Difference]: With dead ends: 103 [2021-11-21 01:27:46,167 INFO L226 Difference]: Without dead ends: 100 [2021-11-21 01:27:46,170 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 78 SyntacticMatches, 19 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1986 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=499, Invalid=6143, Unknown=0, NotChecked=0, Total=6642 [2021-11-21 01:27:46,171 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 16 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 1460 mSolverCounterSat, 278 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 1738 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 278 IncrementalHoareTripleChecker+Valid, 1460 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:46,171 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 129 Invalid, 1738 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [278 Valid, 1460 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-21 01:27:46,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-21 01:27:46,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 57. [2021-11-21 01:27:46,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.1964285714285714) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:46,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2021-11-21 01:27:46,186 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 39 [2021-11-21 01:27:46,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:46,187 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2021-11-21 01:27:46,187 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.9433962264150944) internal successors, (103), 53 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:46,187 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2021-11-21 01:27:46,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-21 01:27:46,188 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:46,189 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:27:46,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:46,403 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:46,404 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:46,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:46,404 INFO L85 PathProgramCache]: Analyzing trace with hash -349329745, now seen corresponding path program 10 times [2021-11-21 01:27:46,404 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:46,404 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109300010] [2021-11-21 01:27:46,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:46,404 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:46,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:46,518 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-21 01:27:46,518 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:46,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109300010] [2021-11-21 01:27:46,518 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [109300010] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:46,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045515227] [2021-11-21 01:27:46,519 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:27:46,519 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:46,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:46,520 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:46,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 01:27:46,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:46,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 01:27:46,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:46,733 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-21 01:27:46,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:46,846 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-21 01:27:46,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045515227] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:46,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1001340892] [2021-11-21 01:27:46,849 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:27:46,849 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:46,850 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:46,850 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:46,850 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:46,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:46,929 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:27:46,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:27:46,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:46,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:27:47,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:47,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:27:47,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:47,125 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:47,147 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:27:47,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-21 01:27:47,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:27:48,311 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:48,486 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:48,486 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:48,486 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-21 01:27:48,487 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847551029] [2021-11-21 01:27:48,487 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:48,487 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 01:27:48,487 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:48,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 01:27:48,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=482, Unknown=0, NotChecked=0, Total=600 [2021-11-21 01:27:48,488 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:48,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:48,709 INFO L93 Difference]: Finished difference Result 134 states and 159 transitions. [2021-11-21 01:27:48,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 01:27:48,710 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-21 01:27:48,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:48,711 INFO L225 Difference]: With dead ends: 134 [2021-11-21 01:27:48,711 INFO L226 Difference]: Without dead ends: 58 [2021-11-21 01:27:48,712 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 218 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=175, Invalid=695, Unknown=0, NotChecked=0, Total=870 [2021-11-21 01:27:48,713 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:48,713 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 13 Invalid, 323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:27:48,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-21 01:27:48,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-11-21 01:27:48,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.1929824561403508) internal successors, (68), 57 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:48,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2021-11-21 01:27:48,727 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 40 [2021-11-21 01:27:48,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:48,728 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2021-11-21 01:27:48,728 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:48,728 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2021-11-21 01:27:48,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-21 01:27:48,729 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:48,730 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:27:48,771 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:48,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-21 01:27:48,952 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:48,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:48,952 INFO L85 PathProgramCache]: Analyzing trace with hash -1524937950, now seen corresponding path program 11 times [2021-11-21 01:27:48,952 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:48,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1866822490] [2021-11-21 01:27:48,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:48,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:48,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:49,096 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-21 01:27:49,096 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:49,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1866822490] [2021-11-21 01:27:49,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1866822490] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:49,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [384932406] [2021-11-21 01:27:49,097 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:27:49,097 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:49,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:49,098 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:49,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 01:27:49,190 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:27:49,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:27:49,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 01:27:49,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:49,442 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-21 01:27:49,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:49,593 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-21 01:27:49,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [384932406] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:49,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [993228483] [2021-11-21 01:27:49,596 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:27:49,596 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:49,596 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:49,596 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:49,596 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:49,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:49,672 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:27:49,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:27:49,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:49,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:27:49,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:49,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:27:49,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:49,854 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:49,873 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:27:49,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-21 01:27:50,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:27:51,025 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:51,225 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:51,226 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:51,226 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 29 [2021-11-21 01:27:51,226 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627595599] [2021-11-21 01:27:51,226 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:51,227 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 01:27:51,227 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:51,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 01:27:51,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=972, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 01:27:51,228 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:51,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:51,569 INFO L93 Difference]: Finished difference Result 92 states and 112 transitions. [2021-11-21 01:27:51,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 01:27:51,569 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-21 01:27:51,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:51,570 INFO L225 Difference]: With dead ends: 92 [2021-11-21 01:27:51,570 INFO L226 Difference]: Without dead ends: 47 [2021-11-21 01:27:51,571 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 424 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=250, Invalid=1390, Unknown=0, NotChecked=0, Total=1640 [2021-11-21 01:27:51,572 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 66 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 233 mSolverCounterSat, 217 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 450 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 217 IncrementalHoareTripleChecker+Valid, 233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:51,572 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 19 Invalid, 450 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [217 Valid, 233 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:27:51,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-21 01:27:51,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-11-21 01:27:51,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.1521739130434783) internal successors, (53), 46 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:51,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2021-11-21 01:27:51,583 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 41 [2021-11-21 01:27:51,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:51,583 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2021-11-21 01:27:51,583 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:51,583 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2021-11-21 01:27:51,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-21 01:27:51,584 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:51,584 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:27:51,607 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:51,791 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 01:27:51,792 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:51,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:51,792 INFO L85 PathProgramCache]: Analyzing trace with hash -1528902075, now seen corresponding path program 12 times [2021-11-21 01:27:51,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:51,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1924063240] [2021-11-21 01:27:51,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:51,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:51,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:54,182 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 3 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:54,182 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:54,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1924063240] [2021-11-21 01:27:54,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1924063240] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:54,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1089441824] [2021-11-21 01:27:54,183 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:27:54,183 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:54,184 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:54,189 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:54,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 01:27:54,256 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:27:54,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:27:54,259 WARN L261 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 127 conjunts are in the unsatisfiable core [2021-11-21 01:27:54,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:55,615 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:27:55,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:56,892 INFO L354 Elim1Store]: treesize reduction 378, result has 41.8 percent of original size [2021-11-21 01:27:56,893 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 87 treesize of output 286 [2021-11-21 01:27:58,484 INFO L354 Elim1Store]: treesize reduction 628, result has 3.2 percent of original size [2021-11-21 01:27:58,484 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 86 treesize of output 35 [2021-11-21 01:27:58,557 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:27:58,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1089441824] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:58,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1726355376] [2021-11-21 01:27:58,559 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:27:58,559 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:58,559 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:58,559 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:58,560 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:58,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:58,635 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:27:58,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:27:58,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:58,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:27:58,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:58,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:27:58,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:58,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:58,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:58,814 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:27:58,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-21 01:27:58,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:27:59,690 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:28:00,051 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:28:00,051 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:28:00,051 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 16, 16] total 61 [2021-11-21 01:28:00,051 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345417063] [2021-11-21 01:28:00,052 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:28:00,052 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-21 01:28:00,052 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:28:00,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-21 01:28:00,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=4044, Unknown=0, NotChecked=0, Total=4290 [2021-11-21 01:28:00,055 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand has 61 states, 61 states have (on average 1.9672131147540983) internal successors, (120), 61 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:03,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:28:03,971 INFO L93 Difference]: Finished difference Result 127 states and 146 transitions. [2021-11-21 01:28:03,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-21 01:28:03,971 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.9672131147540983) internal successors, (120), 61 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-21 01:28:03,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:28:03,973 INFO L225 Difference]: With dead ends: 127 [2021-11-21 01:28:03,973 INFO L226 Difference]: Without dead ends: 124 [2021-11-21 01:28:03,976 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 103 SyntacticMatches, 14 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2576 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=641, Invalid=8101, Unknown=0, NotChecked=0, Total=8742 [2021-11-21 01:28:03,976 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 25 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 1486 mSolverCounterSat, 364 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 1850 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 364 IncrementalHoareTripleChecker+Valid, 1486 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:28:03,977 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 112 Invalid, 1850 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [364 Valid, 1486 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-21 01:28:03,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-21 01:28:03,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 67. [2021-11-21 01:28:03,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.1666666666666667) internal successors, (77), 66 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:03,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 77 transitions. [2021-11-21 01:28:03,998 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 77 transitions. Word has length 46 [2021-11-21 01:28:03,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:28:03,999 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 77 transitions. [2021-11-21 01:28:03,999 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 1.9672131147540983) internal successors, (120), 61 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:03,999 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 77 transitions. [2021-11-21 01:28:04,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-21 01:28:04,000 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:28:04,000 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:28:04,023 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 01:28:04,208 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 01:28:04,208 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:28:04,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:28:04,209 INFO L85 PathProgramCache]: Analyzing trace with hash -151740136, now seen corresponding path program 13 times [2021-11-21 01:28:04,209 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:28:04,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1198256794] [2021-11-21 01:28:04,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:28:04,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:28:04,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:04,375 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-21 01:28:04,375 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:28:04,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1198256794] [2021-11-21 01:28:04,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1198256794] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:28:04,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1378520761] [2021-11-21 01:28:04,376 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:28:04,376 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:04,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:28:04,377 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:28:04,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 01:28:04,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:04,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 01:28:04,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:28:04,646 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-21 01:28:04,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:28:04,739 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-21 01:28:04,739 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1378520761] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:28:04,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1583602763] [2021-11-21 01:28:04,741 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:28:04,741 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:28:04,742 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:28:04,742 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:28:04,742 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:28:04,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:04,804 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 01:28:04,805 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 01:28:04,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:04,844 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:28:04,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:28:04,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:04,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:28:04,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:04,997 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:28:05,019 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:28:05,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-21 01:28:05,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:28:06,025 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:28:06,182 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:28:06,182 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:28:06,182 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-21 01:28:06,182 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47067948] [2021-11-21 01:28:06,183 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:28:06,183 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-21 01:28:06,183 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:28:06,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-21 01:28:06,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:28:06,184 INFO L87 Difference]: Start difference. First operand 67 states and 77 transitions. Second operand has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:06,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:28:06,412 INFO L93 Difference]: Finished difference Result 158 states and 183 transitions. [2021-11-21 01:28:06,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 01:28:06,413 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-21 01:28:06,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:28:06,413 INFO L225 Difference]: With dead ends: 158 [2021-11-21 01:28:06,413 INFO L226 Difference]: Without dead ends: 68 [2021-11-21 01:28:06,415 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 281 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=226, Invalid=896, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 01:28:06,416 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 346 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 346 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:28:06,416 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 11 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 346 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:28:06,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-21 01:28:06,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-21 01:28:06,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.164179104477612) internal successors, (78), 67 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:06,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 78 transitions. [2021-11-21 01:28:06,434 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 78 transitions. Word has length 47 [2021-11-21 01:28:06,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:28:06,435 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 78 transitions. [2021-11-21 01:28:06,435 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:06,435 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 78 transitions. [2021-11-21 01:28:06,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-21 01:28:06,436 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:28:06,436 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:28:06,469 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 01:28:06,663 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 01:28:06,664 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:28:06,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:28:06,664 INFO L85 PathProgramCache]: Analyzing trace with hash -1823627963, now seen corresponding path program 14 times [2021-11-21 01:28:06,664 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:28:06,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36567412] [2021-11-21 01:28:06,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:28:06,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:28:06,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:06,815 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-21 01:28:06,816 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:28:06,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36567412] [2021-11-21 01:28:06,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [36567412] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:28:06,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872466683] [2021-11-21 01:28:06,816 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:28:06,817 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:06,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:28:06,832 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:28:06,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 01:28:06,916 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:28:06,916 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:28:06,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 01:28:06,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:28:07,109 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-21 01:28:07,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:28:07,207 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-21 01:28:07,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872466683] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:28:07,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1322445791] [2021-11-21 01:28:07,209 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:28:07,209 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:28:07,209 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:28:07,210 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:28:07,210 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:28:07,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:07,284 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:28:07,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:28:07,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:07,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:28:07,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:07,370 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:28:07,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:07,451 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:28:07,472 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:28:07,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-21 01:28:07,838 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:28:08,614 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:28:08,757 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:28:08,757 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:28:08,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-21 01:28:08,758 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416415400] [2021-11-21 01:28:08,758 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:28:08,758 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-21 01:28:08,758 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:28:08,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-21 01:28:08,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=613, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:28:08,759 INFO L87 Difference]: Start difference. First operand 68 states and 78 transitions. Second operand has 23 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 23 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:08,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:28:08,981 INFO L93 Difference]: Finished difference Result 107 states and 127 transitions. [2021-11-21 01:28:08,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 01:28:08,981 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 23 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-21 01:28:08,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:28:08,981 INFO L225 Difference]: With dead ends: 107 [2021-11-21 01:28:08,982 INFO L226 Difference]: Without dead ends: 54 [2021-11-21 01:28:08,982 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=270, Invalid=920, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 01:28:08,983 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 53 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 209 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 368 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 209 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:28:08,983 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 13 Invalid, 368 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [209 Valid, 159 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:28:08,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-21 01:28:08,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-11-21 01:28:08,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 53 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:08,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 60 transitions. [2021-11-21 01:28:08,999 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 60 transitions. Word has length 48 [2021-11-21 01:28:08,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:28:08,999 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 60 transitions. [2021-11-21 01:28:08,999 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 23 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:08,999 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 60 transitions. [2021-11-21 01:28:09,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-21 01:28:09,000 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:28:09,000 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:28:09,031 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-21 01:28:09,215 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 01:28:09,216 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:28:09,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:28:09,216 INFO L85 PathProgramCache]: Analyzing trace with hash 2929390, now seen corresponding path program 15 times [2021-11-21 01:28:09,216 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:28:09,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778564857] [2021-11-21 01:28:09,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:28:09,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:28:09,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:12,556 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 1 proven. 146 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:28:12,556 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:28:12,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1778564857] [2021-11-21 01:28:12,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1778564857] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:28:12,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1320192270] [2021-11-21 01:28:12,556 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:28:12,557 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:12,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:28:12,560 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:28:12,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 01:28:12,632 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:28:12,632 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:28:12,635 WARN L261 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 151 conjunts are in the unsatisfiable core [2021-11-21 01:28:12,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:28:14,338 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:28:14,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:28:16,355 INFO L354 Elim1Store]: treesize reduction 567, result has 40.8 percent of original size [2021-11-21 01:28:16,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 104 treesize of output 408 [2021-11-21 01:28:19,571 INFO L354 Elim1Store]: treesize reduction 933, result has 2.6 percent of original size [2021-11-21 01:28:19,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 103 treesize of output 41 [2021-11-21 01:28:19,675 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:28:19,676 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1320192270] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:28:19,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [222033935] [2021-11-21 01:28:19,677 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:28:19,678 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:28:19,678 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:28:19,678 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:28:19,678 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:28:19,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:19,755 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 01:28:19,756 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 01:28:19,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:19,812 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:28:19,813 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:28:19,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:19,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:28:19,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:19,981 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:28:20,000 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:28:20,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-21 01:28:20,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:28:21,017 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:28:21,457 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:28:21,457 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:28:21,457 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 18, 18] total 71 [2021-11-21 01:28:21,457 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112269053] [2021-11-21 01:28:21,458 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:28:21,458 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-21 01:28:21,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:28:21,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-21 01:28:21,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=5425, Unknown=0, NotChecked=0, Total=5700 [2021-11-21 01:28:21,460 INFO L87 Difference]: Start difference. First operand 54 states and 60 transitions. Second operand has 71 states, 71 states have (on average 1.971830985915493) internal successors, (140), 71 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:24,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:28:24,721 INFO L93 Difference]: Finished difference Result 93 states and 104 transitions. [2021-11-21 01:28:24,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-21 01:28:24,721 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.971830985915493) internal successors, (140), 71 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-21 01:28:24,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:28:24,722 INFO L225 Difference]: With dead ends: 93 [2021-11-21 01:28:24,722 INFO L226 Difference]: Without dead ends: 90 [2021-11-21 01:28:24,725 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 119 SyntacticMatches, 16 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2468 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=535, Invalid=8585, Unknown=0, NotChecked=0, Total=9120 [2021-11-21 01:28:24,725 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 2386 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 2525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 2386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:28:24,726 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 87 Invalid, 2525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 2386 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-21 01:28:24,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-21 01:28:24,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 84. [2021-11-21 01:28:24,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.144578313253012) internal successors, (95), 83 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:24,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 95 transitions. [2021-11-21 01:28:24,744 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 95 transitions. Word has length 53 [2021-11-21 01:28:24,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:28:24,744 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 95 transitions. [2021-11-21 01:28:24,745 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 1.971830985915493) internal successors, (140), 71 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:24,745 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 95 transitions. [2021-11-21 01:28:24,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-21 01:28:24,745 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:28:24,745 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:28:24,766 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-21 01:28:24,946 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-21 01:28:24,946 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:28:24,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:28:24,946 INFO L85 PathProgramCache]: Analyzing trace with hash -514525469, now seen corresponding path program 16 times [2021-11-21 01:28:24,947 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:28:24,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711538312] [2021-11-21 01:28:24,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:28:24,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:28:24,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:25,084 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-21 01:28:25,084 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:28:25,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711538312] [2021-11-21 01:28:25,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711538312] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:28:25,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2046753472] [2021-11-21 01:28:25,085 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:28:25,085 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:25,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:28:25,086 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:28:25,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 01:28:25,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:25,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 01:28:25,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:28:25,367 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-21 01:28:25,367 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:28:25,463 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-21 01:28:25,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2046753472] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:28:25,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1467788861] [2021-11-21 01:28:25,464 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:28:25,465 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:28:25,465 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:28:25,465 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:28:25,465 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:28:25,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:25,522 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:28:25,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:28:25,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:25,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:28:25,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:25,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:28:25,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:25,669 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:28:25,686 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:28:25,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-21 01:28:26,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:28:26,847 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:28:27,028 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:28:27,028 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:28:27,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2021-11-21 01:28:27,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960500807] [2021-11-21 01:28:27,029 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:28:27,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 01:28:27,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:28:27,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 01:28:27,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=696, Unknown=0, NotChecked=0, Total=870 [2021-11-21 01:28:27,030 INFO L87 Difference]: Start difference. First operand 84 states and 95 transitions. Second operand has 25 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:27,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:28:27,324 INFO L93 Difference]: Finished difference Result 166 states and 188 transitions. [2021-11-21 01:28:27,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 01:28:27,325 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-21 01:28:27,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:28:27,325 INFO L225 Difference]: With dead ends: 166 [2021-11-21 01:28:27,325 INFO L226 Difference]: Without dead ends: 85 [2021-11-21 01:28:27,326 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=267, Invalid=1065, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 01:28:27,327 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 364 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 364 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:28:27,327 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 11 Invalid, 455 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 364 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:28:27,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-21 01:28:27,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-11-21 01:28:27,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.1428571428571428) internal successors, (96), 84 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:27,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 96 transitions. [2021-11-21 01:28:27,353 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 96 transitions. Word has length 54 [2021-11-21 01:28:27,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:28:27,353 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 96 transitions. [2021-11-21 01:28:27,353 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:27,353 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 96 transitions. [2021-11-21 01:28:27,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-21 01:28:27,354 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:28:27,354 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:28:27,380 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-21 01:28:27,554 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-21 01:28:27,554 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:28:27,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:28:27,555 INFO L85 PathProgramCache]: Analyzing trace with hash 639915542, now seen corresponding path program 17 times [2021-11-21 01:28:27,555 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:28:27,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1526269246] [2021-11-21 01:28:27,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:28:27,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:28:27,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:27,726 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-21 01:28:27,727 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:28:27,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1526269246] [2021-11-21 01:28:27,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1526269246] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:28:27,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1520758765] [2021-11-21 01:28:27,727 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:28:27,728 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:27,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:28:27,729 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:28:27,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-21 01:28:27,831 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 01:28:27,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:28:27,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 01:28:27,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:28:28,030 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-21 01:28:28,030 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:28:28,159 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-21 01:28:28,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1520758765] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:28:28,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [54695611] [2021-11-21 01:28:28,160 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:28:28,161 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:28:28,161 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:28:28,161 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:28:28,161 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:28:28,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:28,216 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:28:28,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:28:28,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:28,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:28:28,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:28,280 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:28:28,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:28,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:28,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:28,398 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:28:28,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-21 01:28:28,632 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:28:29,380 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:28:29,566 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:28:29,566 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:28:29,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-21 01:28:29,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208174668] [2021-11-21 01:28:29,566 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:28:29,567 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-21 01:28:29,567 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:28:29,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-21 01:28:29,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=753, Unknown=0, NotChecked=0, Total=930 [2021-11-21 01:28:29,568 INFO L87 Difference]: Start difference. First operand 85 states and 96 transitions. Second operand has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 26 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:29,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:28:29,861 INFO L93 Difference]: Finished difference Result 122 states and 142 transitions. [2021-11-21 01:28:29,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 01:28:29,862 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 26 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-21 01:28:29,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:28:29,862 INFO L225 Difference]: With dead ends: 122 [2021-11-21 01:28:29,862 INFO L226 Difference]: Without dead ends: 61 [2021-11-21 01:28:29,863 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 149 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 446 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=342, Invalid=1140, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 01:28:29,864 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 51 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 245 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 400 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 245 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:28:29,864 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 11 Invalid, 400 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [245 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:28:29,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-21 01:28:29,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-11-21 01:28:29,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 60 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:29,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2021-11-21 01:28:29,879 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 55 [2021-11-21 01:28:29,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:28:29,879 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2021-11-21 01:28:29,880 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 26 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:29,880 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2021-11-21 01:28:29,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-21 01:28:29,880 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:28:29,880 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:28:29,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-21 01:28:30,081 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:30,081 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:28:30,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:28:30,082 INFO L85 PathProgramCache]: Analyzing trace with hash 1609630117, now seen corresponding path program 18 times [2021-11-21 01:28:30,082 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:28:30,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608654347] [2021-11-21 01:28:30,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:28:30,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:28:30,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:34,791 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 18 proven. 178 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:28:34,791 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:28:34,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608654347] [2021-11-21 01:28:34,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608654347] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:28:34,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494047835] [2021-11-21 01:28:34,791 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:28:34,792 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:34,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:28:34,793 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:28:34,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-21 01:28:34,908 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:28:34,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:28:34,912 WARN L261 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 175 conjunts are in the unsatisfiable core [2021-11-21 01:28:34,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:28:38,021 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 168 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-21 01:28:38,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:28:40,874 INFO L354 Elim1Store]: treesize reduction 794, result has 40.2 percent of original size [2021-11-21 01:28:40,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 120 treesize of output 551 [2021-11-21 01:28:45,195 INFO L354 Elim1Store]: treesize reduction 1298, result has 2.2 percent of original size [2021-11-21 01:28:45,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 121 treesize of output 48 [2021-11-21 01:28:45,290 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 168 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-21 01:28:45,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494047835] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:28:45,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [533385800] [2021-11-21 01:28:45,292 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:28:45,292 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:28:45,292 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:28:45,292 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:28:45,292 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:28:45,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:45,395 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 01:28:45,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 01:28:45,426 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:45,451 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:28:45,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:28:45,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:45,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:28:45,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:45,629 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:28:45,646 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:28:45,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-21 01:28:45,981 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:28:46,716 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:28:47,143 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:28:47,143 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:28:47,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 20, 20] total 71 [2021-11-21 01:28:47,143 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589486159] [2021-11-21 01:28:47,143 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:28:47,144 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-21 01:28:47,144 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:28:47,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-21 01:28:47,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=289, Invalid=5411, Unknown=0, NotChecked=0, Total=5700 [2021-11-21 01:28:47,145 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand has 71 states, 71 states have (on average 2.0140845070422535) internal successors, (143), 71 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:53,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:28:53,910 INFO L93 Difference]: Finished difference Result 163 states and 182 transitions. [2021-11-21 01:28:53,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-11-21 01:28:53,911 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 2.0140845070422535) internal successors, (143), 71 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-21 01:28:53,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:28:53,911 INFO L225 Difference]: With dead ends: 163 [2021-11-21 01:28:53,911 INFO L226 Difference]: Without dead ends: 160 [2021-11-21 01:28:53,912 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 116 SyntacticMatches, 47 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4887 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=1184, Invalid=13578, Unknown=0, NotChecked=0, Total=14762 [2021-11-21 01:28:53,913 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 22 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 3130 mSolverCounterSat, 456 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 3586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 456 IncrementalHoareTripleChecker+Valid, 3130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:28:53,913 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 199 Invalid, 3586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [456 Valid, 3130 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 01:28:53,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-21 01:28:53,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 87. [2021-11-21 01:28:53,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.127906976744186) internal successors, (97), 86 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:53,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 97 transitions. [2021-11-21 01:28:53,934 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 97 transitions. Word has length 60 [2021-11-21 01:28:53,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:28:53,935 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 97 transitions. [2021-11-21 01:28:53,935 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 2.0140845070422535) internal successors, (143), 71 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:53,935 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 97 transitions. [2021-11-21 01:28:53,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-21 01:28:53,936 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:28:53,936 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:28:53,956 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-21 01:28:54,136 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:54,136 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:28:54,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:28:54,137 INFO L85 PathProgramCache]: Analyzing trace with hash -1641489992, now seen corresponding path program 19 times [2021-11-21 01:28:54,137 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:28:54,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605961731] [2021-11-21 01:28:54,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:28:54,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:28:54,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:54,330 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-11-21 01:28:54,330 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:28:54,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605961731] [2021-11-21 01:28:54,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [605961731] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:28:54,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [165477755] [2021-11-21 01:28:54,331 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:28:54,331 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:54,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:28:54,332 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:28:54,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-21 01:28:54,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:54,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-21 01:28:54,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:28:54,746 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-11-21 01:28:54,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:28:54,880 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-11-21 01:28:54,881 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [165477755] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:28:54,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [125588362] [2021-11-21 01:28:54,882 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:28:54,882 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:28:54,883 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:28:54,883 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:28:54,883 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:28:54,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:54,952 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:28:54,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:28:54,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:54,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:28:55,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:55,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:28:55,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:55,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:55,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:55,118 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:28:55,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-21 01:28:55,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:28:56,082 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:28:56,294 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:28:56,294 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:28:56,294 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-21 01:28:56,294 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852911404] [2021-11-21 01:28:56,294 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:28:56,295 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 01:28:56,295 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:28:56,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 01:28:56,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 01:28:56,295 INFO L87 Difference]: Start difference. First operand 87 states and 97 transitions. Second operand has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:56,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:28:56,691 INFO L93 Difference]: Finished difference Result 206 states and 231 transitions. [2021-11-21 01:28:56,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-21 01:28:56,692 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-21 01:28:56,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:28:56,693 INFO L225 Difference]: With dead ends: 206 [2021-11-21 01:28:56,693 INFO L226 Difference]: Without dead ends: 88 [2021-11-21 01:28:56,693 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 428 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=349, Invalid=1373, Unknown=0, NotChecked=0, Total=1722 [2021-11-21 01:28:56,694 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 466 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 466 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:28:56,694 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 17 Invalid, 555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 466 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:28:56,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-21 01:28:56,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2021-11-21 01:28:56,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 87 states have (on average 1.1264367816091954) internal successors, (98), 87 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:56,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 98 transitions. [2021-11-21 01:28:56,720 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 98 transitions. Word has length 61 [2021-11-21 01:28:56,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:28:56,720 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 98 transitions. [2021-11-21 01:28:56,720 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:56,720 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 98 transitions. [2021-11-21 01:28:56,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-21 01:28:56,721 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:28:56,721 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:28:56,744 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-21 01:28:56,923 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:56,924 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:28:56,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:28:56,924 INFO L85 PathProgramCache]: Analyzing trace with hash 1677495077, now seen corresponding path program 20 times [2021-11-21 01:28:56,924 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:28:56,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [555068719] [2021-11-21 01:28:56,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:28:56,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:28:56,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:57,122 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2021-11-21 01:28:57,122 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:28:57,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [555068719] [2021-11-21 01:28:57,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [555068719] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:28:57,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1020594413] [2021-11-21 01:28:57,123 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:28:57,123 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:57,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:28:57,128 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:28:57,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-21 01:28:57,280 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 01:28:57,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:28:57,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-21 01:28:57,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:28:57,588 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2021-11-21 01:28:57,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:28:57,751 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2021-11-21 01:28:57,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1020594413] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:28:57,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1127967642] [2021-11-21 01:28:57,753 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:28:57,753 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:28:57,753 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:28:57,754 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:28:57,754 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:28:57,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:57,819 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:28:57,819 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:28:57,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:57,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:28:57,893 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:57,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:28:57,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:57,998 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:28:58,019 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:28:58,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-21 01:28:58,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:28:59,223 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:28:59,398 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:28:59,398 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:28:59,398 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-21 01:28:59,398 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128463610] [2021-11-21 01:28:59,398 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:28:59,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 01:28:59,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:28:59,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 01:28:59,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=907, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 01:28:59,399 INFO L87 Difference]: Start difference. First operand 88 states and 98 transitions. Second operand has 29 states, 29 states have (on average 1.8275862068965518) internal successors, (53), 29 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:59,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:28:59,719 INFO L93 Difference]: Finished difference Result 137 states and 157 transitions. [2021-11-21 01:28:59,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-21 01:28:59,719 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.8275862068965518) internal successors, (53), 29 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2021-11-21 01:28:59,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:28:59,720 INFO L225 Difference]: With dead ends: 137 [2021-11-21 01:28:59,720 INFO L226 Difference]: Without dead ends: 68 [2021-11-21 01:28:59,721 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 169 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=423, Invalid=1383, Unknown=0, NotChecked=0, Total=1806 [2021-11-21 01:28:59,721 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 53 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 244 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 244 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:28:59,722 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 15 Invalid, 471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [244 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:28:59,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-21 01:28:59,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-21 01:28:59,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.1044776119402986) internal successors, (74), 67 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:59,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 74 transitions. [2021-11-21 01:28:59,747 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 74 transitions. Word has length 62 [2021-11-21 01:28:59,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:28:59,747 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 74 transitions. [2021-11-21 01:28:59,747 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.8275862068965518) internal successors, (53), 29 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:59,747 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 74 transitions. [2021-11-21 01:28:59,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-21 01:28:59,748 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:28:59,748 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:28:59,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-21 01:28:59,971 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:59,972 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:28:59,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:28:59,972 INFO L85 PathProgramCache]: Analyzing trace with hash 961532942, now seen corresponding path program 21 times [2021-11-21 01:28:59,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:28:59,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394383113] [2021-11-21 01:28:59,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:28:59,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:29:00,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:05,690 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 6 proven. 246 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:29:05,690 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:29:05,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394383113] [2021-11-21 01:29:05,690 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1394383113] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:29:05,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1731348577] [2021-11-21 01:29:05,691 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:29:05,691 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:29:05,691 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:29:05,693 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:29:05,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-21 01:29:05,817 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:29:05,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:29:05,821 WARN L261 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 199 conjunts are in the unsatisfiable core [2021-11-21 01:29:05,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:29:09,205 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-11-21 01:29:09,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 22 [2021-11-21 01:29:09,336 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 216 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 01:29:09,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:29:13,774 INFO L354 Elim1Store]: treesize reduction 1059, result has 39.7 percent of original size [2021-11-21 01:29:13,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 138 treesize of output 718 [2021-11-21 01:29:23,758 INFO L354 Elim1Store]: treesize reduction 1723, result has 1.9 percent of original size [2021-11-21 01:29:23,758 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 137 treesize of output 53 [2021-11-21 01:29:23,879 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 216 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 01:29:23,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1731348577] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:29:23,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [442058418] [2021-11-21 01:29:23,881 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:29:23,881 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:29:23,881 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:29:23,881 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:29:23,882 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:29:23,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:23,949 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:29:23,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:29:23,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:23,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:29:24,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:24,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:29:24,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:24,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:24,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:24,157 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:29:24,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-21 01:29:24,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:29:25,214 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:29:25,800 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:29:25,800 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:29:25,800 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 22, 22] total 81 [2021-11-21 01:29:25,800 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342424138] [2021-11-21 01:29:25,801 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:29:25,801 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2021-11-21 01:29:25,801 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:29:25,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-11-21 01:29:25,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=6947, Unknown=0, NotChecked=0, Total=7310 [2021-11-21 01:29:25,803 INFO L87 Difference]: Start difference. First operand 68 states and 74 transitions. Second operand has 81 states, 81 states have (on average 2.0123456790123457) internal successors, (163), 81 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:29:35,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:29:35,239 INFO L93 Difference]: Finished difference Result 189 states and 212 transitions. [2021-11-21 01:29:35,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-11-21 01:29:35,239 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 2.0123456790123457) internal successors, (163), 81 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-21 01:29:35,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:29:35,240 INFO L225 Difference]: With dead ends: 189 [2021-11-21 01:29:35,240 INFO L226 Difference]: Without dead ends: 186 [2021-11-21 01:29:35,242 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 140 SyntacticMatches, 41 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5950 ImplicationChecksByTransitivity, 15.2s TimeCoverageRelationStatistics Valid=1249, Invalid=17383, Unknown=0, NotChecked=0, Total=18632 [2021-11-21 01:29:35,243 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 30 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 2703 mSolverCounterSat, 566 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 3269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 566 IncrementalHoareTripleChecker+Valid, 2703 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:29:35,243 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 137 Invalid, 3269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [566 Valid, 2703 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2021-11-21 01:29:35,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2021-11-21 01:29:35,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 116. [2021-11-21 01:29:35,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.1217391304347826) internal successors, (129), 115 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:29:35,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 129 transitions. [2021-11-21 01:29:35,309 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 129 transitions. Word has length 67 [2021-11-21 01:29:35,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:29:35,309 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 129 transitions. [2021-11-21 01:29:35,309 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 81 states have (on average 2.0123456790123457) internal successors, (163), 81 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:29:35,310 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 129 transitions. [2021-11-21 01:29:35,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-21 01:29:35,310 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:29:35,310 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:29:35,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-21 01:29:35,510 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-21 01:29:35,511 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:29:35,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:29:35,511 INFO L85 PathProgramCache]: Analyzing trace with hash -257665937, now seen corresponding path program 22 times [2021-11-21 01:29:35,511 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:29:35,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123996246] [2021-11-21 01:29:35,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:35,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:29:35,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:35,720 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-21 01:29:35,721 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:29:35,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123996246] [2021-11-21 01:29:35,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [123996246] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:29:35,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [660677211] [2021-11-21 01:29:35,721 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:29:35,721 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:29:35,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:29:35,722 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:29:35,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-21 01:29:35,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:35,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-21 01:29:35,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:29:36,151 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-21 01:29:36,151 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:29:36,320 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-21 01:29:36,321 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [660677211] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:29:36,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1293017916] [2021-11-21 01:29:36,322 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:29:36,322 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:29:36,322 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:29:36,322 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:29:36,323 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:29:36,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:36,401 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 01:29:36,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 01:29:36,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:36,450 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:29:36,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:29:36,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:36,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:29:36,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:36,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:36,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:36,628 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:29:36,628 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-21 01:29:36,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:29:37,577 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:29:37,767 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:29:37,767 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:29:37,767 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2021-11-21 01:29:37,768 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436765387] [2021-11-21 01:29:37,768 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:29:37,768 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-21 01:29:37,768 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:29:37,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-21 01:29:37,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=1066, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 01:29:37,769 INFO L87 Difference]: Start difference. First operand 116 states and 129 transitions. Second operand has 32 states, 32 states have (on average 1.46875) internal successors, (47), 32 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:29:38,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:29:38,155 INFO L93 Difference]: Finished difference Result 250 states and 279 transitions. [2021-11-21 01:29:38,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-21 01:29:38,155 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.46875) internal successors, (47), 32 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-21 01:29:38,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:29:38,156 INFO L225 Difference]: With dead ends: 250 [2021-11-21 01:29:38,156 INFO L226 Difference]: Without dead ends: 117 [2021-11-21 01:29:38,156 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 188 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=421, Invalid=1649, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 01:29:38,157 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 476 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 476 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:29:38,157 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 23 Invalid, 569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 476 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:29:38,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-11-21 01:29:38,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2021-11-21 01:29:38,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.1206896551724137) internal successors, (130), 116 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:29:38,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 130 transitions. [2021-11-21 01:29:38,191 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 130 transitions. Word has length 68 [2021-11-21 01:29:38,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:29:38,191 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 130 transitions. [2021-11-21 01:29:38,191 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.46875) internal successors, (47), 32 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:29:38,191 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 130 transitions. [2021-11-21 01:29:38,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-21 01:29:38,192 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:29:38,192 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:29:38,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-21 01:29:38,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-21 01:29:38,400 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:29:38,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:29:38,400 INFO L85 PathProgramCache]: Analyzing trace with hash 1918344802, now seen corresponding path program 23 times [2021-11-21 01:29:38,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:29:38,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099506379] [2021-11-21 01:29:38,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:38,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:29:38,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:38,607 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-21 01:29:38,607 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:29:38,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1099506379] [2021-11-21 01:29:38,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1099506379] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:29:38,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1393229504] [2021-11-21 01:29:38,607 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:29:38,607 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:29:38,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:29:38,616 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:29:38,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-21 01:29:38,720 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-21 01:29:38,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:29:38,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-21 01:29:38,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:29:38,971 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-21 01:29:38,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:29:39,120 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-21 01:29:39,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1393229504] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:29:39,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1515192466] [2021-11-21 01:29:39,121 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:29:39,122 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:29:39,122 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:29:39,122 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:29:39,122 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:29:39,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:39,175 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 01:29:39,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 01:29:39,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:39,219 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:29:39,220 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:29:39,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:39,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:29:39,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:39,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:39,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:39,384 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:29:39,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-21 01:29:39,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:29:40,492 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:29:40,662 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:29:40,662 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:29:40,662 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2021-11-21 01:29:40,662 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476191700] [2021-11-21 01:29:40,662 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:29:40,663 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-21 01:29:40,663 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:29:40,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-21 01:29:40,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1075, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 01:29:40,664 INFO L87 Difference]: Start difference. First operand 117 states and 130 transitions. Second operand has 32 states, 32 states have (on average 1.84375) internal successors, (59), 32 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:29:40,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:29:40,974 INFO L93 Difference]: Finished difference Result 161 states and 182 transitions. [2021-11-21 01:29:40,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-21 01:29:40,974 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.84375) internal successors, (59), 32 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-21 01:29:40,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:29:40,975 INFO L225 Difference]: With dead ends: 161 [2021-11-21 01:29:40,975 INFO L226 Difference]: Without dead ends: 75 [2021-11-21 01:29:40,975 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 189 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 666 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=513, Invalid=1649, Unknown=0, NotChecked=0, Total=2162 [2021-11-21 01:29:40,976 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 37 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 185 mSolverCounterSat, 251 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 436 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 251 IncrementalHoareTripleChecker+Valid, 185 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:29:40,976 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 11 Invalid, 436 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [251 Valid, 185 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:29:40,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-21 01:29:40,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-21 01:29:40,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 74 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:29:40,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 81 transitions. [2021-11-21 01:29:40,999 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 81 transitions. Word has length 69 [2021-11-21 01:29:40,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:29:40,999 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 81 transitions. [2021-11-21 01:29:40,999 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.84375) internal successors, (59), 32 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:29:41,000 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 81 transitions. [2021-11-21 01:29:41,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-21 01:29:41,000 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:29:41,000 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:29:41,027 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-21 01:29:41,214 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-21 01:29:41,215 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:29:41,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:29:41,215 INFO L85 PathProgramCache]: Analyzing trace with hash -800666363, now seen corresponding path program 24 times [2021-11-21 01:29:41,215 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:29:41,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014835084] [2021-11-21 01:29:41,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:41,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:29:41,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:47,638 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 9 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:29:47,639 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:29:47,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2014835084] [2021-11-21 01:29:47,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2014835084] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:29:47,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [899264233] [2021-11-21 01:29:47,639 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:29:47,639 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:29:47,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:29:47,640 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:29:47,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-21 01:29:47,756 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:29:47,756 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:29:47,760 WARN L261 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 223 conjunts are in the unsatisfiable core [2021-11-21 01:29:47,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:29:51,513 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-11-21 01:29:51,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 22 [2021-11-21 01:29:51,647 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-21 01:29:51,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:29:56,849 INFO L354 Elim1Store]: treesize reduction 1362, result has 39.3 percent of original size [2021-11-21 01:29:56,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 154 treesize of output 905 [2021-11-21 01:30:19,996 INFO L354 Elim1Store]: treesize reduction 2208, result has 1.6 percent of original size [2021-11-21 01:30:19,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 155 treesize of output 60 [2021-11-21 01:30:20,117 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-21 01:30:20,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [899264233] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:30:20,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2026653618] [2021-11-21 01:30:20,119 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:30:20,119 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:30:20,119 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:30:20,119 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:30:20,119 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:30:20,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:30:20,179 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:30:20,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:30:20,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:30:20,202 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:30:20,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:30:20,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:30:20,322 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:30:20,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:30:20,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:30:20,337 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:30:20,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-21 01:30:20,539 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:30:21,268 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:30:21,825 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:30:21,825 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:30:21,825 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 24, 24] total 91 [2021-11-21 01:30:21,826 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791790943] [2021-11-21 01:30:21,826 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:30:21,826 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2021-11-21 01:30:21,826 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:30:21,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-11-21 01:30:21,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=457, Invalid=8663, Unknown=0, NotChecked=0, Total=9120 [2021-11-21 01:30:21,828 INFO L87 Difference]: Start difference. First operand 75 states and 81 transitions. Second operand has 91 states, 91 states have (on average 2.0) internal successors, (182), 91 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:30:31,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:30:31,930 INFO L93 Difference]: Finished difference Result 208 states and 231 transitions. [2021-11-21 01:30:31,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-11-21 01:30:31,931 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 2.0) internal successors, (182), 91 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-21 01:30:31,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:30:31,932 INFO L225 Difference]: With dead ends: 208 [2021-11-21 01:30:31,932 INFO L226 Difference]: Without dead ends: 205 [2021-11-21 01:30:31,933 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 150 SyntacticMatches, 49 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8248 ImplicationChecksByTransitivity, 16.0s TimeCoverageRelationStatistics Valid=1374, Invalid=20382, Unknown=0, NotChecked=0, Total=21756 [2021-11-21 01:30:31,933 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 21 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 3596 mSolverCounterSat, 450 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 4046 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 450 IncrementalHoareTripleChecker+Valid, 3596 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:30:31,933 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 182 Invalid, 4046 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [450 Valid, 3596 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2021-11-21 01:30:31,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-11-21 01:30:31,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 128. [2021-11-21 01:30:31,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 127 states have (on average 1.110236220472441) internal successors, (141), 127 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:30:31,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 141 transitions. [2021-11-21 01:30:31,976 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 141 transitions. Word has length 74 [2021-11-21 01:30:31,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:30:31,976 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 141 transitions. [2021-11-21 01:30:31,977 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 2.0) internal successors, (182), 91 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:30:31,977 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 141 transitions. [2021-11-21 01:30:31,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-21 01:30:31,977 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:30:31,977 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:30:31,998 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-21 01:30:32,177 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-21 01:30:32,178 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:30:32,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:30:32,178 INFO L85 PathProgramCache]: Analyzing trace with hash 948730456, now seen corresponding path program 25 times [2021-11-21 01:30:32,178 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:30:32,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349164258] [2021-11-21 01:30:32,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:30:32,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:30:32,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:30:32,422 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-11-21 01:30:32,422 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:30:32,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349164258] [2021-11-21 01:30:32,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [349164258] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:30:32,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1869031545] [2021-11-21 01:30:32,423 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:30:32,423 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:30:32,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:30:32,432 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:30:32,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-21 01:30:32,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:30:32,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-21 01:30:32,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:30:32,880 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-11-21 01:30:32,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:30:33,025 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-11-21 01:30:33,025 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1869031545] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:30:33,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1587326944] [2021-11-21 01:30:33,026 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:30:33,027 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:30:33,027 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:30:33,027 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:30:33,027 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:30:33,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:30:33,095 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 01:30:33,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 01:30:33,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:30:33,122 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:30:33,141 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:30:33,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:30:33,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:30:33,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:30:33,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:30:33,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:30:33,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:30:33,274 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:30:33,274 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-21 01:30:33,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:30:34,233 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:30:34,432 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:30:34,432 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:30:34,432 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2021-11-21 01:30:34,433 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092744947] [2021-11-21 01:30:34,433 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:30:34,433 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-21 01:30:34,433 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:30:34,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-21 01:30:34,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=1247, Unknown=0, NotChecked=0, Total=1560 [2021-11-21 01:30:34,434 INFO L87 Difference]: Start difference. First operand 128 states and 141 transitions. Second operand has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:30:34,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:30:34,918 INFO L93 Difference]: Finished difference Result 276 states and 305 transitions. [2021-11-21 01:30:34,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 01:30:34,919 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-21 01:30:34,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:30:34,920 INFO L225 Difference]: With dead ends: 276 [2021-11-21 01:30:34,920 INFO L226 Difference]: Without dead ends: 129 [2021-11-21 01:30:34,921 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 208 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=500, Invalid=1950, Unknown=0, NotChecked=0, Total=2450 [2021-11-21 01:30:34,921 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 645 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:30:34,922 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 13 Invalid, 645 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 530 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:30:34,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-21 01:30:34,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2021-11-21 01:30:34,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 128 states have (on average 1.109375) internal successors, (142), 128 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:30:34,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 142 transitions. [2021-11-21 01:30:34,964 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 142 transitions. Word has length 75 [2021-11-21 01:30:34,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:30:34,964 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 142 transitions. [2021-11-21 01:30:34,964 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:30:34,964 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 142 transitions. [2021-11-21 01:30:34,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-21 01:30:34,965 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:30:34,965 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:30:34,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-21 01:30:35,165 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-21 01:30:35,166 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:30:35,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:30:35,166 INFO L85 PathProgramCache]: Analyzing trace with hash -939349755, now seen corresponding path program 26 times [2021-11-21 01:30:35,166 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:30:35,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124260241] [2021-11-21 01:30:35,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:30:35,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:30:35,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:30:35,412 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2021-11-21 01:30:35,412 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:30:35,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124260241] [2021-11-21 01:30:35,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2124260241] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:30:35,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [573962442] [2021-11-21 01:30:35,413 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:30:35,413 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:30:35,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:30:35,414 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:30:35,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-21 01:30:35,599 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-21 01:30:35,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:30:35,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-21 01:30:35,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:30:36,156 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2021-11-21 01:30:36,156 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:30:36,474 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2021-11-21 01:30:36,474 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [573962442] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:30:36,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1381716113] [2021-11-21 01:30:36,475 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:30:36,475 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:30:36,475 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:30:36,476 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:30:36,476 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:30:36,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:30:36,543 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:30:36,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:30:36,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:30:36,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:30:36,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:30:36,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:30:36,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:30:36,728 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:30:36,749 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:30:36,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-21 01:30:37,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:30:37,875 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:30:38,115 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:30:38,115 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:30:38,116 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 54 [2021-11-21 01:30:38,116 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777571194] [2021-11-21 01:30:38,116 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:30:38,116 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-21 01:30:38,116 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:30:38,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-21 01:30:38,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=430, Invalid=2992, Unknown=0, NotChecked=0, Total=3422 [2021-11-21 01:30:38,117 INFO L87 Difference]: Start difference. First operand 129 states and 142 transitions. Second operand has 54 states, 54 states have (on average 1.4259259259259258) internal successors, (77), 54 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:30:38,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:30:38,644 INFO L93 Difference]: Finished difference Result 177 states and 198 transitions. [2021-11-21 01:30:38,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-21 01:30:38,644 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.4259259259259258) internal successors, (77), 54 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-21 01:30:38,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:30:38,645 INFO L225 Difference]: With dead ends: 177 [2021-11-21 01:30:38,645 INFO L226 Difference]: Without dead ends: 82 [2021-11-21 01:30:38,645 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 193 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1459 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=750, Invalid=4220, Unknown=0, NotChecked=0, Total=4970 [2021-11-21 01:30:38,646 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 48 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 371 mSolverCounterSat, 388 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 759 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 388 IncrementalHoareTripleChecker+Valid, 371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:30:38,646 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 23 Invalid, 759 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [388 Valid, 371 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:30:38,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-21 01:30:38,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-11-21 01:30:38,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.0864197530864197) internal successors, (88), 81 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:30:38,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 88 transitions. [2021-11-21 01:30:38,674 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 88 transitions. Word has length 76 [2021-11-21 01:30:38,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:30:38,675 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 88 transitions. [2021-11-21 01:30:38,675 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.4259259259259258) internal successors, (77), 54 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:30:38,675 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 88 transitions. [2021-11-21 01:30:38,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-21 01:30:38,675 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:30:38,675 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:30:38,696 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-21 01:30:38,875 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-21 01:30:38,876 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:30:38,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:30:38,876 INFO L85 PathProgramCache]: Analyzing trace with hash -1043686098, now seen corresponding path program 27 times [2021-11-21 01:30:38,876 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:30:38,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1359043387] [2021-11-21 01:30:38,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:30:38,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:30:39,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:30:46,294 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 49 proven. 336 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:30:46,294 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:30:46,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1359043387] [2021-11-21 01:30:46,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1359043387] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:30:46,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1485589437] [2021-11-21 01:30:46,294 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:30:46,295 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:30:46,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:30:46,295 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:30:46,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-21 01:30:46,420 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:30:46,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:30:46,424 WARN L261 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 247 conjunts are in the unsatisfiable core [2021-11-21 01:30:46,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:30:50,905 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-21 01:30:50,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:30:57,949 INFO L354 Elim1Store]: treesize reduction 1703, result has 39.0 percent of original size [2021-11-21 01:30:57,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 172 treesize of output 1116 [2021-11-21 01:31:36,135 INFO L354 Elim1Store]: treesize reduction 2753, result has 1.5 percent of original size [2021-11-21 01:31:36,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 171 treesize of output 65 [2021-11-21 01:31:36,264 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-21 01:31:36,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1485589437] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:31:36,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [160144773] [2021-11-21 01:31:36,266 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:31:36,266 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:31:36,266 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:31:36,266 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:31:36,267 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:31:36,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:31:36,319 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 01:31:36,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 01:31:36,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:31:36,364 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:31:36,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:31:36,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:31:36,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:31:36,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:31:36,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:31:36,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:31:36,516 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:31:36,517 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-21 01:31:36,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:31:37,544 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:31:38,160 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:31:38,160 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:31:38,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 26, 26] total 97 [2021-11-21 01:31:38,161 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435136128] [2021-11-21 01:31:38,161 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:31:38,161 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-21 01:31:38,162 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:31:38,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-21 01:31:38,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=507, Invalid=9795, Unknown=0, NotChecked=0, Total=10302 [2021-11-21 01:31:38,163 INFO L87 Difference]: Start difference. First operand 82 states and 88 transitions. Second operand has 97 states, 97 states have (on average 2.020618556701031) internal successors, (196), 97 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:31:51,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:31:51,266 INFO L93 Difference]: Finished difference Result 217 states and 236 transitions. [2021-11-21 01:31:51,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-11-21 01:31:51,267 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 2.020618556701031) internal successors, (196), 97 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-21 01:31:51,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:31:51,269 INFO L225 Difference]: With dead ends: 217 [2021-11-21 01:31:51,269 INFO L226 Difference]: Without dead ends: 214 [2021-11-21 01:31:51,270 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 159 SyntacticMatches, 62 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9876 ImplicationChecksByTransitivity, 20.3s TimeCoverageRelationStatistics Valid=1837, Invalid=23923, Unknown=0, NotChecked=0, Total=25760 [2021-11-21 01:31:51,271 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 23 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 4354 mSolverCounterSat, 571 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 210 SdHoareTripleChecker+Invalid, 4925 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 571 IncrementalHoareTripleChecker+Valid, 4354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:31:51,271 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 210 Invalid, 4925 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [571 Valid, 4354 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2021-11-21 01:31:51,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-11-21 01:31:51,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 117. [2021-11-21 01:31:51,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0948275862068966) internal successors, (127), 116 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:31:51,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 127 transitions. [2021-11-21 01:31:51,327 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 127 transitions. Word has length 81 [2021-11-21 01:31:51,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:31:51,327 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 127 transitions. [2021-11-21 01:31:51,327 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 2.020618556701031) internal successors, (196), 97 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:31:51,328 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 127 transitions. [2021-11-21 01:31:51,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-21 01:31:51,328 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:31:51,329 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:31:51,364 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-21 01:31:51,551 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-21 01:31:51,552 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:31:51,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:31:51,552 INFO L85 PathProgramCache]: Analyzing trace with hash 2005053263, now seen corresponding path program 28 times [2021-11-21 01:31:51,552 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:31:51,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1480281317] [2021-11-21 01:31:51,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:31:51,552 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:31:51,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:31:51,842 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2021-11-21 01:31:51,843 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:31:51,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1480281317] [2021-11-21 01:31:51,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1480281317] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:31:51,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1675310955] [2021-11-21 01:31:51,843 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:31:51,843 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:31:51,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:31:51,845 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:31:51,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-21 01:31:51,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:31:51,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 431 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 01:31:51,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:31:52,373 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2021-11-21 01:31:52,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:31:52,531 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2021-11-21 01:31:52,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1675310955] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:31:52,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [672639186] [2021-11-21 01:31:52,532 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:31:52,532 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:31:52,533 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:31:52,533 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:31:52,533 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:31:52,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:31:52,604 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 01:31:52,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 01:31:52,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:31:52,641 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:31:52,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:31:52,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:31:52,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:31:52,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:31:52,780 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:31:52,798 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:31:52,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-21 01:31:53,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:31:53,918 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:31:54,122 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:31:54,122 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:31:54,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2021-11-21 01:31:54,123 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920909419] [2021-11-21 01:31:54,123 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:31:54,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-21 01:31:54,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:31:54,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-21 01:31:54,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=1442, Unknown=0, NotChecked=0, Total=1806 [2021-11-21 01:31:54,124 INFO L87 Difference]: Start difference. First operand 117 states and 127 transitions. Second operand has 38 states, 38 states have (on average 1.394736842105263) internal successors, (53), 38 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:31:54,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:31:54,592 INFO L93 Difference]: Finished difference Result 278 states and 303 transitions. [2021-11-21 01:31:54,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-21 01:31:54,593 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.394736842105263) internal successors, (53), 38 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-21 01:31:54,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:31:54,593 INFO L225 Difference]: With dead ends: 278 [2021-11-21 01:31:54,593 INFO L226 Difference]: Without dead ends: 118 [2021-11-21 01:31:54,594 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 228 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 701 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=586, Invalid=2276, Unknown=0, NotChecked=0, Total=2862 [2021-11-21 01:31:54,595 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 527 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 648 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 527 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:31:54,595 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 15 Invalid, 648 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 527 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:31:54,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-11-21 01:31:54,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2021-11-21 01:31:54,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.0940170940170941) internal successors, (128), 117 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:31:54,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 128 transitions. [2021-11-21 01:31:54,639 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 128 transitions. Word has length 82 [2021-11-21 01:31:54,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:31:54,639 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 128 transitions. [2021-11-21 01:31:54,639 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.394736842105263) internal successors, (53), 38 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:31:54,639 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 128 transitions. [2021-11-21 01:31:54,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-21 01:31:54,640 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:31:54,640 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:31:54,660 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-21 01:31:54,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:31:54,840 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:31:54,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:31:54,841 INFO L85 PathProgramCache]: Analyzing trace with hash 1619530754, now seen corresponding path program 29 times [2021-11-21 01:31:54,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:31:54,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746881356] [2021-11-21 01:31:54,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:31:54,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:31:54,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:31:55,089 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 286 trivial. 0 not checked. [2021-11-21 01:31:55,089 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:31:55,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746881356] [2021-11-21 01:31:55,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [746881356] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:31:55,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1560427024] [2021-11-21 01:31:55,089 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:31:55,089 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:31:55,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:31:55,090 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:31:55,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-21 01:31:55,249 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-21 01:31:55,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:31:55,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 01:31:55,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:31:55,663 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 286 trivial. 0 not checked. [2021-11-21 01:31:55,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:31:55,860 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 286 trivial. 0 not checked. [2021-11-21 01:31:55,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1560427024] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:31:55,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [927724918] [2021-11-21 01:31:55,862 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:31:55,862 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:31:55,862 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:31:55,863 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:31:55,863 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:31:55,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:31:55,942 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:31:55,943 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:31:55,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:31:55,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:31:56,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:31:56,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:31:56,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:31:56,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:31:56,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:31:56,108 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:31:56,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-21 01:31:56,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:31:57,127 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:31:57,303 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:31:57,304 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:31:57,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2021-11-21 01:31:57,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688623065] [2021-11-21 01:31:57,304 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:31:57,304 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-21 01:31:57,304 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:31:57,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-21 01:31:57,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=1453, Unknown=0, NotChecked=0, Total=1806 [2021-11-21 01:31:57,305 INFO L87 Difference]: Start difference. First operand 118 states and 128 transitions. Second operand has 38 states, 38 states have (on average 1.763157894736842) internal successors, (67), 38 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:31:57,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:31:57,724 INFO L93 Difference]: Finished difference Result 182 states and 202 transitions. [2021-11-21 01:31:57,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-21 01:31:57,724 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.763157894736842) internal successors, (67), 38 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-21 01:31:57,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:31:57,725 INFO L225 Difference]: With dead ends: 182 [2021-11-21 01:31:57,725 INFO L226 Difference]: Without dead ends: 89 [2021-11-21 01:31:57,725 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 229 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 926 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=720, Invalid=2250, Unknown=0, NotChecked=0, Total=2970 [2021-11-21 01:31:57,726 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 52 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 282 mSolverCounterSat, 365 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 647 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 365 IncrementalHoareTripleChecker+Valid, 282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:31:57,726 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 17 Invalid, 647 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [365 Valid, 282 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:31:57,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-21 01:31:57,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-11-21 01:31:57,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 88 states have (on average 1.0795454545454546) internal successors, (95), 88 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:31:57,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 95 transitions. [2021-11-21 01:31:57,762 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 95 transitions. Word has length 83 [2021-11-21 01:31:57,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:31:57,763 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 95 transitions. [2021-11-21 01:31:57,763 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.763157894736842) internal successors, (67), 38 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:31:57,763 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 95 transitions. [2021-11-21 01:31:57,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-21 01:31:57,764 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:31:57,764 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:31:57,785 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-21 01:31:57,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-21 01:31:57,968 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:31:57,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:31:57,968 INFO L85 PathProgramCache]: Analyzing trace with hash -1982713755, now seen corresponding path program 30 times [2021-11-21 01:31:57,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:31:57,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853050620] [2021-11-21 01:31:57,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:31:57,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:31:58,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:32:08,124 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 39 proven. 423 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:32:08,124 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:32:08,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853050620] [2021-11-21 01:32:08,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [853050620] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:32:08,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [60515251] [2021-11-21 01:32:08,125 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:32:08,125 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:32:08,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:32:08,126 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:32:08,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-21 01:32:08,280 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:32:08,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:32:08,285 WARN L261 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 271 conjunts are in the unsatisfiable core [2021-11-21 01:32:08,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:32:14,287 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 396 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-21 01:32:14,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:32:24,235 WARN L227 SmtUtils]: Spent 5.39s on a formula simplification. DAG size of input: 981 DAG size of output: 541 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-21 01:32:24,236 INFO L354 Elim1Store]: treesize reduction 2082, result has 38.8 percent of original size [2021-11-21 01:32:24,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 22 select indices, 22 select index equivalence classes, 0 disjoint index pairs (out of 231 index pairs), introduced 22 new quantified variables, introduced 231 case distinctions, treesize of input 189 treesize of output 1348 [2021-11-21 01:32:56,502 INFO L354 Elim1Store]: treesize reduction 3358, result has 1.3 percent of original size [2021-11-21 01:32:56,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 22 select indices, 22 select index equivalence classes, 0 disjoint index pairs (out of 231 index pairs), introduced 22 new quantified variables, introduced 231 case distinctions, treesize of input 188 treesize of output 71 [2021-11-21 01:32:56,660 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 396 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-21 01:32:56,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [60515251] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:32:56,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1707276217] [2021-11-21 01:32:56,661 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:32:56,661 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:32:56,662 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:32:56,662 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:32:56,662 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:32:56,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:32:56,741 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:32:56,741 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:32:56,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:32:56,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:32:56,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:32:56,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:32:56,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:32:56,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:32:56,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:32:56,956 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:32:56,957 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-21 01:32:57,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:32:57,879 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:32:58,582 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:32:58,582 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:32:58,582 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 28, 28] total 108 [2021-11-21 01:32:58,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270122127] [2021-11-21 01:32:58,582 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:32:58,583 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2021-11-21 01:32:58,583 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:32:58,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2021-11-21 01:32:58,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=487, Invalid=12169, Unknown=0, NotChecked=0, Total=12656 [2021-11-21 01:32:58,584 INFO L87 Difference]: Start difference. First operand 89 states and 95 transitions. Second operand has 108 states, 108 states have (on average 1.9814814814814814) internal successors, (214), 108 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:33:16,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:33:16,767 INFO L93 Difference]: Finished difference Result 235 states and 254 transitions. [2021-11-21 01:33:16,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-11-21 01:33:16,768 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 108 states have (on average 1.9814814814814814) internal successors, (214), 108 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 88 [2021-11-21 01:33:16,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:33:16,770 INFO L225 Difference]: With dead ends: 235 [2021-11-21 01:33:16,770 INFO L226 Difference]: Without dead ends: 232 [2021-11-21 01:33:16,772 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 172 SyntacticMatches, 66 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9903 ImplicationChecksByTransitivity, 28.4s TimeCoverageRelationStatistics Valid=2359, Invalid=29861, Unknown=0, NotChecked=0, Total=32220 [2021-11-21 01:33:16,773 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 27 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 4675 mSolverCounterSat, 741 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 5416 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 741 IncrementalHoareTripleChecker+Valid, 4675 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2021-11-21 01:33:16,773 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 200 Invalid, 5416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [741 Valid, 4675 Invalid, 0 Unknown, 0 Unchecked, 4.8s Time] [2021-11-21 01:33:16,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-11-21 01:33:16,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 127. [2021-11-21 01:33:16,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 126 states have (on average 1.0873015873015872) internal successors, (137), 126 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:33:16,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 137 transitions. [2021-11-21 01:33:16,857 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 137 transitions. Word has length 88 [2021-11-21 01:33:16,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:33:16,858 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 137 transitions. [2021-11-21 01:33:16,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 108 states have (on average 1.9814814814814814) internal successors, (214), 108 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:33:16,858 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 137 transitions. [2021-11-21 01:33:16,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-21 01:33:16,859 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:33:16,859 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:33:16,901 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2021-11-21 01:33:17,087 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:33:17,088 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:33:17,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:33:17,088 INFO L85 PathProgramCache]: Analyzing trace with hash -1335000328, now seen corresponding path program 31 times [2021-11-21 01:33:17,088 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:33:17,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1407569554] [2021-11-21 01:33:17,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:33:17,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:33:17,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:33:17,449 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-21 01:33:17,449 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:33:17,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1407569554] [2021-11-21 01:33:17,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1407569554] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:33:17,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1613128943] [2021-11-21 01:33:17,450 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:33:17,450 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:33:17,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:33:17,452 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:33:17,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-21 01:33:17,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:33:17,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 467 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-21 01:33:17,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:33:18,152 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-21 01:33:18,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:33:18,328 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-21 01:33:18,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1613128943] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:33:18,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1031134356] [2021-11-21 01:33:18,329 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:33:18,329 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:33:18,330 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:33:18,330 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:33:18,330 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:33:18,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:33:18,390 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 01:33:18,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 01:33:18,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:33:18,430 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:33:18,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:33:18,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:33:18,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:33:18,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:33:18,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:33:18,563 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:33:18,574 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:33:18,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-21 01:33:18,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:33:19,809 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:33:20,132 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:33:20,132 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:33:20,132 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2021-11-21 01:33:20,132 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899719517] [2021-11-21 01:33:20,133 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:33:20,133 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-21 01:33:20,133 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:33:20,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-21 01:33:20,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=1651, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 01:33:20,134 INFO L87 Difference]: Start difference. First operand 127 states and 137 transitions. Second operand has 41 states, 41 states have (on average 1.3658536585365855) internal successors, (56), 41 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:33:20,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:33:20,786 INFO L93 Difference]: Finished difference Result 302 states and 327 transitions. [2021-11-21 01:33:20,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-21 01:33:20,787 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.3658536585365855) internal successors, (56), 41 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 89 [2021-11-21 01:33:20,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:33:20,788 INFO L225 Difference]: With dead ends: 302 [2021-11-21 01:33:20,788 INFO L226 Difference]: Without dead ends: 128 [2021-11-21 01:33:20,789 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 248 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=679, Invalid=2627, Unknown=0, NotChecked=0, Total=3306 [2021-11-21 01:33:20,790 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 676 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 821 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 676 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:33:20,790 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 17 Invalid, 821 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 676 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:33:20,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-21 01:33:20,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 128. [2021-11-21 01:33:20,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 127 states have (on average 1.0866141732283465) internal successors, (138), 127 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:33:20,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2021-11-21 01:33:20,863 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 89 [2021-11-21 01:33:20,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:33:20,863 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2021-11-21 01:33:20,863 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.3658536585365855) internal successors, (56), 41 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:33:20,864 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2021-11-21 01:33:20,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-21 01:33:20,864 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:33:20,864 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:33:20,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-21 01:33:21,064 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:33:21,065 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:33:21,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:33:21,065 INFO L85 PathProgramCache]: Analyzing trace with hash 532807397, now seen corresponding path program 32 times [2021-11-21 01:33:21,065 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:33:21,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1340469965] [2021-11-21 01:33:21,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:33:21,066 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:33:21,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:33:21,420 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2021-11-21 01:33:21,420 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:33:21,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1340469965] [2021-11-21 01:33:21,420 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1340469965] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:33:21,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [207938878] [2021-11-21 01:33:21,421 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:33:21,421 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:33:21,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:33:21,428 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:33:21,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-21 01:33:21,671 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-21 01:33:21,671 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:33:21,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 473 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-21 01:33:21,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:33:22,324 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2021-11-21 01:33:22,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:33:22,759 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2021-11-21 01:33:22,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [207938878] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:33:22,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1158335728] [2021-11-21 01:33:22,760 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:33:22,761 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:33:22,761 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:33:22,761 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:33:22,761 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:33:22,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:33:22,825 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:33:22,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:33:22,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:33:22,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:33:22,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:33:22,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:33:22,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:33:22,994 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:33:23,014 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:33:23,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-21 01:33:23,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:33:24,177 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:33:24,455 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:33:24,455 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:33:24,456 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 64 [2021-11-21 01:33:24,456 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719089911] [2021-11-21 01:33:24,456 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:33:24,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-21 01:33:24,456 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:33:24,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-21 01:33:24,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=584, Invalid=4108, Unknown=0, NotChecked=0, Total=4692 [2021-11-21 01:33:24,457 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand has 64 states, 64 states have (on average 1.359375) internal successors, (87), 64 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:33:25,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:33:25,185 INFO L93 Difference]: Finished difference Result 197 states and 217 transitions. [2021-11-21 01:33:25,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-21 01:33:25,185 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.359375) internal successors, (87), 64 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 90 [2021-11-21 01:33:25,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:33:25,186 INFO L225 Difference]: With dead ends: 197 [2021-11-21 01:33:25,186 INFO L226 Difference]: Without dead ends: 96 [2021-11-21 01:33:25,187 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 241 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2041 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1027, Invalid=5779, Unknown=0, NotChecked=0, Total=6806 [2021-11-21 01:33:25,187 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 52 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 502 mSolverCounterSat, 471 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 973 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 471 IncrementalHoareTripleChecker+Valid, 502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:33:25,187 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 27 Invalid, 973 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [471 Valid, 502 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:33:25,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-21 01:33:25,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-11-21 01:33:25,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.0736842105263158) internal successors, (102), 95 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:33:25,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 102 transitions. [2021-11-21 01:33:25,235 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 102 transitions. Word has length 90 [2021-11-21 01:33:25,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:33:25,236 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 102 transitions. [2021-11-21 01:33:25,236 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.359375) internal successors, (87), 64 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:33:25,236 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 102 transitions. [2021-11-21 01:33:25,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-21 01:33:25,236 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:33:25,236 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:33:25,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-21 01:33:25,437 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-21 01:33:25,437 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:33:25,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:33:25,438 INFO L85 PathProgramCache]: Analyzing trace with hash 290131534, now seen corresponding path program 33 times [2021-11-21 01:33:25,438 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:33:25,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [881145062] [2021-11-21 01:33:25,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:33:25,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:33:25,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:33:37,026 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 66 proven. 480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:33:37,027 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:33:37,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [881145062] [2021-11-21 01:33:37,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [881145062] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:33:37,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [421571691] [2021-11-21 01:33:37,027 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:33:37,027 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:33:37,027 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:33:37,028 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:33:37,029 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-21 01:33:37,184 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:33:37,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:33:37,190 WARN L261 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 295 conjunts are in the unsatisfiable core [2021-11-21 01:33:37,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:33:44,901 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 0 proven. 468 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-21 01:33:44,902 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:33:59,120 WARN L227 SmtUtils]: Spent 8.32s on a formula simplification. DAG size of input: 1166 DAG size of output: 638 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-21 01:33:59,122 INFO L354 Elim1Store]: treesize reduction 2499, result has 38.6 percent of original size [2021-11-21 01:33:59,123 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 24 select indices, 24 select index equivalence classes, 0 disjoint index pairs (out of 276 index pairs), introduced 24 new quantified variables, introduced 276 case distinctions, treesize of input 206 treesize of output 1602 [2021-11-21 01:35:42,207 INFO L354 Elim1Store]: treesize reduction 4023, result has 1.2 percent of original size [2021-11-21 01:35:42,207 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 24 select indices, 24 select index equivalence classes, 0 disjoint index pairs (out of 276 index pairs), introduced 24 new quantified variables, introduced 276 case distinctions, treesize of input 205 treesize of output 77 [2021-11-21 01:35:42,402 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 0 proven. 468 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-21 01:35:42,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [421571691] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:35:42,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [640492196] [2021-11-21 01:35:42,404 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:35:42,404 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:35:42,405 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:35:42,405 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:35:42,405 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:35:42,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:35:42,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:35:42,486 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:35:42,487 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:35:42,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:35:42,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:35:42,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:35:42,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:35:42,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:35:42,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:35:42,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:35:42,642 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:35:42,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-21 01:35:42,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:35:43,735 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:35:44,618 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:35:44,618 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:35:44,618 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 30, 30] total 116 [2021-11-21 01:35:44,619 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562010424] [2021-11-21 01:35:44,619 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:35:44,619 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 116 states [2021-11-21 01:35:44,619 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:35:44,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2021-11-21 01:35:44,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=552, Invalid=13968, Unknown=0, NotChecked=0, Total=14520 [2021-11-21 01:35:44,622 INFO L87 Difference]: Start difference. First operand 96 states and 102 transitions. Second operand has 116 states, 116 states have (on average 1.9827586206896552) internal successors, (230), 116 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:36:09,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:36:09,400 INFO L93 Difference]: Finished difference Result 253 states and 272 transitions. [2021-11-21 01:36:09,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-11-21 01:36:09,400 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 116 states have (on average 1.9827586206896552) internal successors, (230), 116 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2021-11-21 01:36:09,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:36:09,402 INFO L225 Difference]: With dead ends: 253 [2021-11-21 01:36:09,402 INFO L226 Difference]: Without dead ends: 250 [2021-11-21 01:36:09,405 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 457 GetRequests, 184 SyntacticMatches, 74 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13201 ImplicationChecksByTransitivity, 37.3s TimeCoverageRelationStatistics Valid=2975, Invalid=37225, Unknown=0, NotChecked=0, Total=40200 [2021-11-21 01:36:09,405 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 16 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 5701 mSolverCounterSat, 897 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 6598 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 897 IncrementalHoareTripleChecker+Valid, 5701 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:36:09,405 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 221 Invalid, 6598 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [897 Valid, 5701 Invalid, 0 Unknown, 0 Unchecked, 6.5s Time] [2021-11-21 01:36:09,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2021-11-21 01:36:09,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 137. [2021-11-21 01:36:09,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 136 states have (on average 1.0808823529411764) internal successors, (147), 136 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:36:09,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 147 transitions. [2021-11-21 01:36:09,506 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 147 transitions. Word has length 95 [2021-11-21 01:36:09,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:36:09,507 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 147 transitions. [2021-11-21 01:36:09,507 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 116 states, 116 states have (on average 1.9827586206896552) internal successors, (230), 116 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:36:09,507 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 147 transitions. [2021-11-21 01:36:09,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-21 01:36:09,508 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:36:09,508 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:36:09,533 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-21 01:36:09,708 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-21 01:36:09,708 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:36:09,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:36:09,709 INFO L85 PathProgramCache]: Analyzing trace with hash 403726895, now seen corresponding path program 34 times [2021-11-21 01:36:09,709 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:36:09,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59188759] [2021-11-21 01:36:09,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:36:09,709 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:36:09,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:36:10,124 INFO L134 CoverageAnalysis]: Checked inductivity of 559 backedges. 79 proven. 90 refuted. 0 times theorem prover too weak. 390 trivial. 0 not checked. [2021-11-21 01:36:10,124 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:36:10,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59188759] [2021-11-21 01:36:10,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59188759] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:36:10,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1600600917] [2021-11-21 01:36:10,124 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:36:10,125 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:36:10,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:36:10,126 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:36:10,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-21 01:36:10,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:36:10,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-21 01:36:10,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:36:10,797 INFO L134 CoverageAnalysis]: Checked inductivity of 559 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 390 trivial. 0 not checked. [2021-11-21 01:36:10,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:36:11,027 INFO L134 CoverageAnalysis]: Checked inductivity of 559 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 390 trivial. 0 not checked. [2021-11-21 01:36:11,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1600600917] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:36:11,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1411961160] [2021-11-21 01:36:11,029 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:36:11,029 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:36:11,029 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:36:11,029 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:36:11,029 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:36:11,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:36:11,102 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:36:11,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:36:11,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:36:11,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:36:11,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:36:11,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:36:11,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:36:11,301 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:36:11,323 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:36:11,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-21 01:36:11,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:36:12,588 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:36:12,867 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:36:12,867 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:36:12,867 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 44 [2021-11-21 01:36:12,868 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886794623] [2021-11-21 01:36:12,868 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:36:12,869 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-21 01:36:12,869 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:36:12,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-21 01:36:12,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=478, Invalid=1874, Unknown=0, NotChecked=0, Total=2352 [2021-11-21 01:36:12,870 INFO L87 Difference]: Start difference. First operand 137 states and 147 transitions. Second operand has 44 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 44 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:36:13,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:36:13,641 INFO L93 Difference]: Finished difference Result 326 states and 351 transitions. [2021-11-21 01:36:13,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-21 01:36:13,642 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 44 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2021-11-21 01:36:13,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:36:13,643 INFO L225 Difference]: With dead ends: 326 [2021-11-21 01:36:13,643 INFO L226 Difference]: Without dead ends: 138 [2021-11-21 01:36:13,643 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 268 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 918 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=779, Invalid=3003, Unknown=0, NotChecked=0, Total=3782 [2021-11-21 01:36:13,644 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 812 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 933 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 812 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:36:13,644 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 15 Invalid, 933 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 812 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:36:13,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-21 01:36:13,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2021-11-21 01:36:13,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 137 states have (on average 1.0802919708029197) internal successors, (148), 137 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:36:13,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 148 transitions. [2021-11-21 01:36:13,730 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 148 transitions. Word has length 96 [2021-11-21 01:36:13,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:36:13,730 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 148 transitions. [2021-11-21 01:36:13,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 44 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:36:13,730 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 148 transitions. [2021-11-21 01:36:13,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-21 01:36:13,731 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:36:13,731 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:36:13,752 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-21 01:36:13,931 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-21 01:36:13,931 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:36:13,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:36:13,932 INFO L85 PathProgramCache]: Analyzing trace with hash -566095454, now seen corresponding path program 35 times [2021-11-21 01:36:13,932 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:36:13,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1067113512] [2021-11-21 01:36:13,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:36:13,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:36:13,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:36:14,308 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 66 proven. 103 refuted. 0 times theorem prover too weak. 403 trivial. 0 not checked. [2021-11-21 01:36:14,308 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:36:14,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1067113512] [2021-11-21 01:36:14,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1067113512] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:36:14,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [74841961] [2021-11-21 01:36:14,309 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:36:14,309 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:36:14,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:36:14,309 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:36:14,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-21 01:36:14,566 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-21 01:36:14,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:36:14,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-21 01:36:14,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:36:15,359 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 403 trivial. 0 not checked. [2021-11-21 01:36:15,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:36:15,875 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 403 trivial. 0 not checked. [2021-11-21 01:36:15,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [74841961] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:36:15,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1349292559] [2021-11-21 01:36:15,876 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:36:15,876 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:36:15,876 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:36:15,877 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:36:15,877 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:36:15,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:36:15,960 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:36:15,961 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:36:16,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:36:16,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 01:36:16,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:36:16,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:36:16,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:36:16,147 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:36:16,171 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:36:16,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-21 01:36:16,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 01:36:17,768 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:36:18,109 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:36:18,109 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:36:18,109 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 69 [2021-11-21 01:36:18,109 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276826960] [2021-11-21 01:36:18,109 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:36:18,110 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-21 01:36:18,110 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:36:18,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-21 01:36:18,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=670, Invalid=4732, Unknown=0, NotChecked=0, Total=5402 [2021-11-21 01:36:18,111 INFO L87 Difference]: Start difference. First operand 138 states and 148 transitions. Second operand has 69 states, 69 states have (on average 1.3333333333333333) internal successors, (92), 69 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:36:18,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:36:18,941 INFO L93 Difference]: Finished difference Result 212 states and 232 transitions. [2021-11-21 01:36:18,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-21 01:36:18,941 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 1.3333333333333333) internal successors, (92), 69 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 97 [2021-11-21 01:36:18,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:36:18,942 INFO L225 Difference]: With dead ends: 212 [2021-11-21 01:36:18,942 INFO L226 Difference]: Without dead ends: 103 [2021-11-21 01:36:18,943 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 260 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2368 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1182, Invalid=6650, Unknown=0, NotChecked=0, Total=7832 [2021-11-21 01:36:18,943 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 83 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 687 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 1127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 687 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:36:18,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 29 Invalid, 1127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [687 Valid, 440 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:36:18,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-21 01:36:19,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-21 01:36:19,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.0686274509803921) internal successors, (109), 102 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:36:19,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 109 transitions. [2021-11-21 01:36:19,009 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 109 transitions. Word has length 97 [2021-11-21 01:36:19,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:36:19,009 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 109 transitions. [2021-11-21 01:36:19,009 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 1.3333333333333333) internal successors, (92), 69 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:36:19,010 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 109 transitions. [2021-11-21 01:36:19,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-21 01:36:19,010 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:36:19,010 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:36:19,034 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-21 01:36:19,210 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-21 01:36:19,211 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:36:19,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:36:19,211 INFO L85 PathProgramCache]: Analyzing trace with hash -1543164987, now seen corresponding path program 36 times [2021-11-21 01:36:19,211 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:36:19,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185870879] [2021-11-21 01:36:19,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:36:19,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:36:19,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:36:32,198 INFO L134 CoverageAnalysis]: Checked inductivity of 637 backedges. 83 proven. 554 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:36:32,198 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:36:32,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185870879] [2021-11-21 01:36:32,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1185870879] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:36:32,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [912039289] [2021-11-21 01:36:32,199 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:36:32,199 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:36:32,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:36:32,202 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:36:32,210 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b267ef-9f42-4226-b21c-c7e4cb2286e1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-21 01:36:32,389 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:36:32,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:36:32,396 WARN L261 TraceCheckSpWp]: Trace formula consists of 431 conjuncts, 319 conjunts are in the unsatisfiable core [2021-11-21 01:36:32,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:36:40,174 INFO L134 CoverageAnalysis]: Checked inductivity of 637 backedges. 0 proven. 546 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-21 01:36:40,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:36:57,733 WARN L227 SmtUtils]: Spent 11.11s on a formula simplification. DAG size of input: 1367 DAG size of output: 743 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-21 01:36:57,735 INFO L354 Elim1Store]: treesize reduction 2954, result has 38.5 percent of original size [2021-11-21 01:36:57,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 26 select indices, 26 select index equivalence classes, 0 disjoint index pairs (out of 325 index pairs), introduced 26 new quantified variables, introduced 325 case distinctions, treesize of input 223 treesize of output 1878