./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-cav19/array_init_var_plus_ind.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_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/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_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-cav19/array_init_var_plus_ind.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/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_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/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 c51b17720ce1dad8733576d816f307564aabdff8c7a86cf8d9848ed8571cafd2 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:12:55,960 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:12:55,962 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:12:56,012 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:12:56,013 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:12:56,018 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:12:56,021 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:12:56,026 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:12:56,028 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:12:56,036 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:12:56,037 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:12:56,039 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:12:56,040 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:12:56,043 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:12:56,046 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:12:56,051 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:12:56,055 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:12:56,056 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:12:56,059 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:12:56,063 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:12:56,070 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:12:56,071 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:12:56,074 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:12:56,076 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:12:56,082 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:12:56,082 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:12:56,083 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:12:56,085 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:12:56,086 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:12:56,087 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:12:56,088 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:12:56,089 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:12:56,091 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:12:56,093 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:12:56,095 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:12:56,095 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:12:56,096 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:12:56,097 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:12:56,097 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:12:56,098 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:12:56,098 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:12:56,099 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:12:56,149 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:12:56,150 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:12:56,150 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:12:56,151 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:12:56,152 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:12:56,152 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:12:56,152 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:12:56,152 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:12:56,153 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:12:56,153 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:12:56,154 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:12:56,154 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:12:56,155 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:12:56,155 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:12:56,155 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:12:56,155 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:12:56,156 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:12:56,156 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:12:56,157 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:12:56,158 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:12:56,158 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:12:56,158 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:12:56,158 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:12:56,158 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:12:56,159 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:12:56,159 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:12:56,161 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:12:56,161 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:12:56,162 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:12:56,162 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:12:56,162 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:12:56,163 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:12:56,163 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:12:56,163 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:12:56,163 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:12:56,164 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:12:56,164 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:12:56,164 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:12:56,164 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:12:56,165 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:12:56,165 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:12:56,165 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_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c51b17720ce1dad8733576d816f307564aabdff8c7a86cf8d9848ed8571cafd2 [2021-11-21 00:12:56,431 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:12:56,456 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:12:56,459 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:12:56,460 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:12:56,461 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:12:56,463 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-cav19/array_init_var_plus_ind.c [2021-11-21 00:12:56,523 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/data/6a1872e53/66266a7a35f5480283f5042cb70f1a49/FLAG55df7e319 [2021-11-21 00:12:56,954 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:12:56,955 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/sv-benchmarks/c/array-cav19/array_init_var_plus_ind.c [2021-11-21 00:12:56,961 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/data/6a1872e53/66266a7a35f5480283f5042cb70f1a49/FLAG55df7e319 [2021-11-21 00:12:57,348 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/data/6a1872e53/66266a7a35f5480283f5042cb70f1a49 [2021-11-21 00:12:57,351 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:12:57,352 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:12:57,354 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:12:57,354 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:12:57,358 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:12:57,359 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:12:57" (1/1) ... [2021-11-21 00:12:57,360 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1ea70619 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:12:57, skipping insertion in model container [2021-11-21 00:12:57,361 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:12:57" (1/1) ... [2021-11-21 00:12:57,368 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:12:57,382 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:12:57,549 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_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/sv-benchmarks/c/array-cav19/array_init_var_plus_ind.c[414,427] [2021-11-21 00:12:57,565 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:12:57,571 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:12:57,582 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_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/sv-benchmarks/c/array-cav19/array_init_var_plus_ind.c[414,427] [2021-11-21 00:12:57,588 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:12:57,601 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:12:57,602 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:12:57 WrapperNode [2021-11-21 00:12:57,602 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:12:57,603 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:12:57,603 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:12:57,603 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:12:57,614 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:12:57" (1/1) ... [2021-11-21 00:12:57,624 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:12:57" (1/1) ... [2021-11-21 00:12:57,648 INFO L137 Inliner]: procedures = 15, calls = 13, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 51 [2021-11-21 00:12:57,649 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:12:57,650 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:12:57,650 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:12:57,650 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:12:57,659 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:12:57" (1/1) ... [2021-11-21 00:12:57,660 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:12:57" (1/1) ... [2021-11-21 00:12:57,676 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:12:57" (1/1) ... [2021-11-21 00:12:57,677 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:12:57" (1/1) ... [2021-11-21 00:12:57,681 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:12:57" (1/1) ... [2021-11-21 00:12:57,687 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:12:57" (1/1) ... [2021-11-21 00:12:57,693 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:12:57" (1/1) ... [2021-11-21 00:12:57,701 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:12:57,702 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:12:57,702 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:12:57,702 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:12:57,704 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:12:57" (1/1) ... [2021-11-21 00:12:57,712 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:12:57,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:12:57,742 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:12:57,772 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:12:57,791 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:12:57,791 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:12:57,792 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 00:12:57,792 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 00:12:57,792 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:12:57,792 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:12:57,792 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 00:12:57,793 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 00:12:57,864 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:12:57,866 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:12:58,016 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:12:58,041 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:12:58,041 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 00:12:58,043 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:12:58 BoogieIcfgContainer [2021-11-21 00:12:58,044 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:12:58,045 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:12:58,045 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:12:58,049 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:12:58,049 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:12:57" (1/3) ... [2021-11-21 00:12:58,050 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2887e2c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:12:58, skipping insertion in model container [2021-11-21 00:12:58,050 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:12:57" (2/3) ... [2021-11-21 00:12:58,050 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2887e2c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:12:58, skipping insertion in model container [2021-11-21 00:12:58,051 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:12:58" (3/3) ... [2021-11-21 00:12:58,052 INFO L111 eAbstractionObserver]: Analyzing ICFG array_init_var_plus_ind.c [2021-11-21 00:12:58,057 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:12:58,058 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:12:58,115 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:12:58,125 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 00:12:58,133 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:12:58,147 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:12:58,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 00:12:58,161 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:12:58,162 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-21 00:12:58,163 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:12:58,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:12:58,169 INFO L85 PathProgramCache]: Analyzing trace with hash -1868223123, now seen corresponding path program 1 times [2021-11-21 00:12:58,195 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:12:58,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [72680673] [2021-11-21 00:12:58,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:12:58,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:12:58,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:12:58,387 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:12:58,387 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:12:58,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [72680673] [2021-11-21 00:12:58,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [72680673] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:12:58,389 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:12:58,389 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:12:58,391 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293004715] [2021-11-21 00:12:58,392 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:12:58,396 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:12:58,396 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:12:58,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:12:58,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:12:58,427 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:12:58,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:12:58,489 INFO L93 Difference]: Finished difference Result 26 states and 33 transitions. [2021-11-21 00:12:58,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:12:58,492 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-21 00:12:58,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:12:58,500 INFO L225 Difference]: With dead ends: 26 [2021-11-21 00:12:58,501 INFO L226 Difference]: Without dead ends: 17 [2021-11-21 00:12:58,503 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 00:12:58,508 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 9 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:12:58,509 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 10 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:12:58,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-21 00:12:58,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 10. [2021-11-21 00:12:58,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:12:58,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2021-11-21 00:12:58,542 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 6 [2021-11-21 00:12:58,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:12:58,543 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2021-11-21 00:12:58,543 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:12:58,543 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2021-11-21 00:12:58,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 00:12:58,543 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:12:58,544 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:12:58,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:12:58,544 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:12:58,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:12:58,545 INFO L85 PathProgramCache]: Analyzing trace with hash 947313280, now seen corresponding path program 1 times [2021-11-21 00:12:58,546 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:12:58,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161869532] [2021-11-21 00:12:58,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:12:58,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:12:58,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:12:58,621 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:12:58,622 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:12:58,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161869532] [2021-11-21 00:12:58,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1161869532] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:12:58,624 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:12:58,624 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:12:58,624 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689187710] [2021-11-21 00:12:58,625 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:12:58,628 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:12:58,628 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:12:58,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:12:58,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:12:58,630 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:12:58,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:12:58,667 INFO L93 Difference]: Finished difference Result 18 states and 21 transitions. [2021-11-21 00:12:58,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:12:58,667 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-21 00:12:58,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:12:58,668 INFO L225 Difference]: With dead ends: 18 [2021-11-21 00:12:58,668 INFO L226 Difference]: Without dead ends: 11 [2021-11-21 00:12:58,669 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:12:58,670 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 1 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:12:58,671 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 15 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:12:58,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-11-21 00:12:58,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-11-21 00:12:58,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:12:58,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2021-11-21 00:12:58,675 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 7 [2021-11-21 00:12:58,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:12:58,676 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2021-11-21 00:12:58,676 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:12:58,676 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2021-11-21 00:12:58,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 00:12:58,677 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:12:58,677 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:12:58,677 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 00:12:58,677 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:12:58,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:12:58,678 INFO L85 PathProgramCache]: Analyzing trace with hash 362824998, now seen corresponding path program 1 times [2021-11-21 00:12:58,679 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:12:58,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472471066] [2021-11-21 00:12:58,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:12:58,679 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:12:58,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:12:58,767 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:12:58,767 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:12:58,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472471066] [2021-11-21 00:12:58,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472471066] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:12:58,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [541040434] [2021-11-21 00:12:58,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:12:58,768 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:12:58,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:12:58,770 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:12:58,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:12:58,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:12:58,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:12:58,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:12:58,934 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:12:58,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:12:58,974 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:12:58,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [541040434] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:12:58,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1890126477] [2021-11-21 00:12:58,996 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-21 00:12:58,997 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:12:59,001 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:12:59,007 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:12:59,007 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:12:59,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:59,116 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:12:59,117 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 00:12:59,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:59,187 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:12:59,188 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 00:12:59,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:59,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 00:12:59,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:59,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:59,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:59,670 INFO L354 Elim1Store]: treesize reduction 57, result has 10.9 percent of original size [2021-11-21 00:12:59,671 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 213 treesize of output 210 [2021-11-21 00:13:00,242 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 21 treesize of output 17 [2021-11-21 00:13:00,356 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 21 treesize of output 17 [2021-11-21 00:13:00,968 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:01,477 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:01,477 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:01,478 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 8 [2021-11-21 00:13:01,478 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337195101] [2021-11-21 00:13:01,478 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:01,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 00:13:01,479 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:01,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 00:13:01,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2021-11-21 00:13:01,480 INFO L87 Difference]: Start difference. First operand 11 states and 13 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:01,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:01,554 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2021-11-21 00:13:01,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:13:01,555 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-21 00:13:01,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:01,556 INFO L225 Difference]: With dead ends: 36 [2021-11-21 00:13:01,556 INFO L226 Difference]: Without dead ends: 28 [2021-11-21 00:13:01,556 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=66, Invalid=206, Unknown=0, NotChecked=0, Total=272 [2021-11-21 00:13:01,558 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 20 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:01,558 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 29 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:13:01,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-21 00:13:01,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 16. [2021-11-21 00:13:01,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 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 00:13:01,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2021-11-21 00:13:01,563 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 8 [2021-11-21 00:13:01,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:01,563 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2021-11-21 00:13:01,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:01,564 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2021-11-21 00:13:01,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 00:13:01,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:01,565 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:01,603 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:01,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:01,774 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:13:01,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:01,774 INFO L85 PathProgramCache]: Analyzing trace with hash 1925995406, now seen corresponding path program 1 times [2021-11-21 00:13:01,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:01,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136410014] [2021-11-21 00:13:01,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:01,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:01,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:01,890 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:01,890 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:01,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136410014] [2021-11-21 00:13:01,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1136410014] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:01,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096103601] [2021-11-21 00:13:01,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:01,891 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:01,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:01,892 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:01,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:13:01,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:01,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-21 00:13:01,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:02,009 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 00:13:02,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-21 00:13:02,129 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:02,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:02,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-21 00:13:02,185 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-21 00:13:02,254 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:02,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2096103601] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:02,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [418658474] [2021-11-21 00:13:02,258 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-21 00:13:02,258 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:02,259 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:02,259 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:02,259 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:02,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:02,306 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:13:02,307 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 00:13:02,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:02,370 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:13:02,371 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 00:13:02,526 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:02,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 38 [2021-11-21 00:13:02,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:02,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:02,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:02,780 INFO L354 Elim1Store]: treesize reduction 57, result has 10.9 percent of original size [2021-11-21 00:13:02,780 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 219 treesize of output 216 [2021-11-21 00:13:03,263 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 21 treesize of output 17 [2021-11-21 00:13:03,712 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 21 treesize of output 17 [2021-11-21 00:13:03,764 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:04,301 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:04,301 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:04,301 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 9 [2021-11-21 00:13:04,302 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050928151] [2021-11-21 00:13:04,302 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:04,302 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-21 00:13:04,302 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:04,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-21 00:13:04,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-11-21 00:13:04,303 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:04,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:04,410 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2021-11-21 00:13:04,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 00:13:04,410 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-21 00:13:04,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:04,411 INFO L225 Difference]: With dead ends: 29 [2021-11-21 00:13:04,411 INFO L226 Difference]: Without dead ends: 27 [2021-11-21 00:13:04,412 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 18 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2021-11-21 00:13:04,413 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 12 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:04,413 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 37 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:13:04,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-21 00:13:04,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 19. [2021-11-21 00:13:04,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:04,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2021-11-21 00:13:04,418 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 11 [2021-11-21 00:13:04,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:04,418 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2021-11-21 00:13:04,418 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:04,418 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2021-11-21 00:13:04,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-21 00:13:04,419 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:04,419 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:04,454 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:04,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:04,620 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:13:04,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:04,620 INFO L85 PathProgramCache]: Analyzing trace with hash 1306013557, now seen corresponding path program 2 times [2021-11-21 00:13:04,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:04,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [430297604] [2021-11-21 00:13:04,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:04,621 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:04,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:04,788 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:04,789 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:04,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [430297604] [2021-11-21 00:13:04,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [430297604] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:04,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [371788968] [2021-11-21 00:13:04,790 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:13:04,790 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:04,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:04,798 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:04,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:13:04,854 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 00:13:04,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:13:04,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-21 00:13:04,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:04,908 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 17 treesize of output 13 [2021-11-21 00:13:04,942 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-21 00:13:04,943 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-21 00:13:04,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-21 00:13:05,022 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:05,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:05,115 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2021-11-21 00:13:05,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 191 treesize of output 183 [2021-11-21 00:13:05,271 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:05,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [371788968] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:05,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [219161831] [2021-11-21 00:13:05,278 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-21 00:13:05,278 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:05,279 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:05,279 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:05,279 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:05,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:05,317 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:13:05,318 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 00:13:05,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:05,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:05,389 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:13:05,390 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 00:13:05,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:05,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 00:13:05,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:05,711 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:13:05,739 INFO L354 Elim1Store]: treesize reduction 72, result has 22.6 percent of original size [2021-11-21 00:13:05,740 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 210 treesize of output 213 [2021-11-21 00:13:06,265 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 21 treesize of output 17 [2021-11-21 00:13:06,653 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 21 treesize of output 17 [2021-11-21 00:13:06,691 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:07,195 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:07,196 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:07,196 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2021-11-21 00:13:07,196 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882525838] [2021-11-21 00:13:07,196 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:07,197 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-21 00:13:07,197 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:07,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-21 00:13:07,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=397, Unknown=0, NotChecked=0, Total=462 [2021-11-21 00:13:07,198 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 16 states, 16 states have (on average 1.875) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:07,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:07,421 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2021-11-21 00:13:07,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 00:13:07,422 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-21 00:13:07,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:07,422 INFO L225 Difference]: With dead ends: 39 [2021-11-21 00:13:07,423 INFO L226 Difference]: Without dead ends: 37 [2021-11-21 00:13:07,423 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 22 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=149, Invalid=721, Unknown=0, NotChecked=0, Total=870 [2021-11-21 00:13:07,425 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 44 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 20 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:07,425 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 43 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 85 Invalid, 0 Unknown, 20 Unchecked, 0.1s Time] [2021-11-21 00:13:07,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-21 00:13:07,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 22. [2021-11-21 00:13:07,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 21 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:07,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2021-11-21 00:13:07,431 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 13 [2021-11-21 00:13:07,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:07,431 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2021-11-21 00:13:07,432 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:07,432 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2021-11-21 00:13:07,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-21 00:13:07,432 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:07,433 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:07,453 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:07,637 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:07,638 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:13:07,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:07,638 INFO L85 PathProgramCache]: Analyzing trace with hash 866156038, now seen corresponding path program 1 times [2021-11-21 00:13:07,638 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:07,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428101967] [2021-11-21 00:13:07,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:07,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:07,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:07,722 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:07,722 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:07,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428101967] [2021-11-21 00:13:07,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1428101967] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:07,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1822336145] [2021-11-21 00:13:07,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:07,723 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:07,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:07,724 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:07,737 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:13:07,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:07,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:13:07,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:07,846 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:07,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:07,891 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:07,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1822336145] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:07,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1984697648] [2021-11-21 00:13:07,897 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:13:07,897 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:07,898 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:07,898 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:07,898 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:07,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:07,948 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:13:07,948 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 00:13:07,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:07,993 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:13:07,993 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 00:13:08,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:08,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 00:13:08,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:08,309 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:13:08,331 INFO L354 Elim1Store]: treesize reduction 72, result has 22.6 percent of original size [2021-11-21 00:13:08,332 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 210 treesize of output 213 [2021-11-21 00:13:08,752 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 21 treesize of output 17 [2021-11-21 00:13:09,743 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 21 treesize of output 17 [2021-11-21 00:13:09,757 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:10,270 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:10,270 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:10,270 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2021-11-21 00:13:10,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388003072] [2021-11-21 00:13:10,270 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:10,271 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 00:13:10,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:10,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 00:13:10,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-11-21 00:13:10,272 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:10,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:10,309 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2021-11-21 00:13:10,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:13:10,310 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-21 00:13:10,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:10,311 INFO L225 Difference]: With dead ends: 32 [2021-11-21 00:13:10,311 INFO L226 Difference]: Without dead ends: 22 [2021-11-21 00:13:10,311 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-11-21 00:13:10,312 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 3 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:10,313 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 30 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:13:10,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-21 00:13:10,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-21 00:13:10,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:10,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-11-21 00:13:10,317 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 14 [2021-11-21 00:13:10,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:10,318 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-11-21 00:13:10,318 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:10,318 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-11-21 00:13:10,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-21 00:13:10,319 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:10,319 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:10,342 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:10,529 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:10,529 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:13:10,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:10,530 INFO L85 PathProgramCache]: Analyzing trace with hash 1372708234, now seen corresponding path program 2 times [2021-11-21 00:13:10,530 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:10,530 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794161193] [2021-11-21 00:13:10,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:10,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:10,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:10,620 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:10,620 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:10,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794161193] [2021-11-21 00:13:10,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1794161193] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:10,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2012197132] [2021-11-21 00:13:10,621 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:13:10,621 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:10,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:10,622 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:10,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:13:10,664 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-21 00:13:10,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:13:10,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:13:10,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:10,791 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:10,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:10,875 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:10,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2012197132] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:10,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1985765986] [2021-11-21 00:13:10,877 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-21 00:13:10,877 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:10,878 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:10,878 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:10,878 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:10,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:10,916 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:13:10,916 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 00:13:10,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:10,980 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:13:10,981 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 00:13:11,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:11,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 32 [2021-11-21 00:13:11,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:11,251 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:13:11,274 INFO L354 Elim1Store]: treesize reduction 92, result has 26.4 percent of original size [2021-11-21 00:13:11,275 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 218 treesize of output 225 [2021-11-21 00:13:11,636 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 21 treesize of output 17 [2021-11-21 00:13:11,701 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 21 treesize of output 17 [2021-11-21 00:13:12,075 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:12,389 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:12,389 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:12,389 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 19 [2021-11-21 00:13:12,389 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535994871] [2021-11-21 00:13:12,389 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:12,390 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 00:13:12,390 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:12,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 00:13:12,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=444, Unknown=0, NotChecked=0, Total=650 [2021-11-21 00:13:12,391 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:12,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:12,500 INFO L93 Difference]: Finished difference Result 99 states and 117 transitions. [2021-11-21 00:13:12,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 00:13:12,501 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-21 00:13:12,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:12,502 INFO L225 Difference]: With dead ends: 99 [2021-11-21 00:13:12,502 INFO L226 Difference]: Without dead ends: 90 [2021-11-21 00:13:12,503 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=206, Invalid=444, Unknown=0, NotChecked=0, Total=650 [2021-11-21 00:13:12,504 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 178 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:12,504 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 64 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:13:12,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-21 00:13:12,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 35. [2021-11-21 00:13:12,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.3235294117647058) internal successors, (45), 34 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 00:13:12,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2021-11-21 00:13:12,512 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 16 [2021-11-21 00:13:12,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:12,512 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2021-11-21 00:13:12,512 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:12,513 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2021-11-21 00:13:12,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-21 00:13:12,513 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:12,513 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:12,551 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:12,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:12,741 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:13:12,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:12,742 INFO L85 PathProgramCache]: Analyzing trace with hash -653734721, now seen corresponding path program 2 times [2021-11-21 00:13:12,742 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:12,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1488277597] [2021-11-21 00:13:12,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:12,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:12,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:12,891 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:12,892 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:12,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1488277597] [2021-11-21 00:13:12,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1488277597] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:12,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [550569340] [2021-11-21 00:13:12,892 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:13:12,892 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:12,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:12,893 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:12,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:13:12,927 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 00:13:12,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:13:12,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-21 00:13:12,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:12,997 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 27 treesize of output 23 [2021-11-21 00:13:13,179 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-11-21 00:13:13,180 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 52 treesize of output 39 [2021-11-21 00:13:13,214 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:13,214 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:13,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 25 [2021-11-21 00:13:13,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 40 [2021-11-21 00:13:13,576 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:13,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [550569340] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:13,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1772784405] [2021-11-21 00:13:13,579 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:13:13,579 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:13,579 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:13,580 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:13,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:13,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:13,613 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:13:13,613 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 00:13:13,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:13,657 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:13:13,658 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 00:13:13,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:13,787 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 00:13:13,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:13,968 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:13:13,995 INFO L354 Elim1Store]: treesize reduction 72, result has 22.6 percent of original size [2021-11-21 00:13:13,995 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 206 treesize of output 209 [2021-11-21 00:13:14,337 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 21 treesize of output 17 [2021-11-21 00:13:15,230 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 21 treesize of output 17 [2021-11-21 00:13:15,254 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:15,851 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:15,851 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:15,851 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 20 [2021-11-21 00:13:15,851 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213101891] [2021-11-21 00:13:15,851 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:15,852 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-21 00:13:15,852 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:15,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-21 00:13:15,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=643, Unknown=0, NotChecked=0, Total=756 [2021-11-21 00:13:15,854 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 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 00:13:15,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:15,999 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2021-11-21 00:13:16,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 00:13:16,000 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 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 16 [2021-11-21 00:13:16,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:16,002 INFO L225 Difference]: With dead ends: 46 [2021-11-21 00:13:16,002 INFO L226 Difference]: Without dead ends: 36 [2021-11-21 00:13:16,003 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=151, Invalid=841, Unknown=0, NotChecked=0, Total=992 [2021-11-21 00:13:16,003 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 5 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 35 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:16,004 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 45 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 69 Invalid, 0 Unknown, 35 Unchecked, 0.1s Time] [2021-11-21 00:13:16,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-21 00:13:16,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2021-11-21 00:13:16,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2941176470588236) internal successors, (44), 34 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 00:13:16,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 44 transitions. [2021-11-21 00:13:16,009 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 44 transitions. Word has length 16 [2021-11-21 00:13:16,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:16,011 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 44 transitions. [2021-11-21 00:13:16,011 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 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 00:13:16,012 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 44 transitions. [2021-11-21 00:13:16,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-21 00:13:16,014 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:16,014 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:16,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:16,229 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-21 00:13:16,229 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:13:16,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:16,230 INFO L85 PathProgramCache]: Analyzing trace with hash -1663029757, now seen corresponding path program 3 times [2021-11-21 00:13:16,230 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:16,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1749351492] [2021-11-21 00:13:16,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:16,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:16,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:16,370 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 2 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:16,371 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:16,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1749351492] [2021-11-21 00:13:16,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1749351492] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:16,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [216703044] [2021-11-21 00:13:16,371 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:13:16,371 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:16,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:16,373 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:16,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:13:16,425 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:13:16,425 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:13:16,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-21 00:13:16,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:16,475 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 17 treesize of output 13 [2021-11-21 00:13:16,507 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-21 00:13:16,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2021-11-21 00:13:16,557 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-21 00:13:16,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2021-11-21 00:13:16,597 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-21 00:13:16,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-21 00:13:16,655 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-21 00:13:16,682 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:16,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:16,833 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 24 [2021-11-21 00:13:16,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 38 [2021-11-21 00:13:16,894 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:13:16,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [216703044] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:16,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1985339965] [2021-11-21 00:13:16,896 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-21 00:13:16,896 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:16,897 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:16,897 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:16,897 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:16,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:16,935 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:13:16,936 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 00:13:16,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:16,955 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 00:13:17,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:17,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 00:13:17,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:17,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:17,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:17,230 INFO L354 Elim1Store]: treesize reduction 57, result has 10.9 percent of original size [2021-11-21 00:13:17,230 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 213 treesize of output 210 [2021-11-21 00:13:17,550 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 21 treesize of output 17 [2021-11-21 00:13:17,890 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 21 treesize of output 17 [2021-11-21 00:13:17,910 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:18,338 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:18,339 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:18,339 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8] total 19 [2021-11-21 00:13:18,339 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463177350] [2021-11-21 00:13:18,339 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:18,340 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 00:13:18,340 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:18,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 00:13:18,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=558, Unknown=0, NotChecked=0, Total=650 [2021-11-21 00:13:18,341 INFO L87 Difference]: Start difference. First operand 35 states and 44 transitions. Second operand has 20 states, 20 states have (on average 1.95) internal successors, (39), 19 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 00:13:18,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:18,515 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2021-11-21 00:13:18,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 00:13:18,516 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 19 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 17 [2021-11-21 00:13:18,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:18,516 INFO L225 Difference]: With dead ends: 41 [2021-11-21 00:13:18,516 INFO L226 Difference]: Without dead ends: 39 [2021-11-21 00:13:18,517 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 30 SyntacticMatches, 4 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=162, Invalid=768, Unknown=0, NotChecked=0, Total=930 [2021-11-21 00:13:18,518 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 50 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 8 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:18,518 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 34 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 130 Invalid, 0 Unknown, 8 Unchecked, 0.1s Time] [2021-11-21 00:13:18,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-21 00:13:18,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 34. [2021-11-21 00:13:18,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.303030303030303) internal successors, (43), 33 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:18,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 43 transitions. [2021-11-21 00:13:18,523 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 43 transitions. Word has length 17 [2021-11-21 00:13:18,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:18,524 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 43 transitions. [2021-11-21 00:13:18,524 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 19 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 00:13:18,524 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 43 transitions. [2021-11-21 00:13:18,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-21 00:13:18,525 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:18,525 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:18,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:18,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:18,741 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:13:18,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:18,742 INFO L85 PathProgramCache]: Analyzing trace with hash -979873480, now seen corresponding path program 3 times [2021-11-21 00:13:18,742 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:18,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [518276776] [2021-11-21 00:13:18,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:18,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:18,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:18,871 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:18,872 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:18,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [518276776] [2021-11-21 00:13:18,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [518276776] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:18,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [672860707] [2021-11-21 00:13:18,872 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:13:18,873 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:18,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:18,874 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:18,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:13:18,925 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:13:18,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:13:18,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-21 00:13:18,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:18,957 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 19 treesize of output 15 [2021-11-21 00:13:18,993 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 00:13:18,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 00:13:19,037 INFO L354 Elim1Store]: treesize reduction 72, result has 20.9 percent of original size [2021-11-21 00:13:19,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 41 treesize of output 43 [2021-11-21 00:13:19,222 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:13:19,223 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 54 treesize of output 30 [2021-11-21 00:13:19,249 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:19,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:30,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 76 treesize of output 72 [2021-11-21 00:13:30,189 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-21 00:13:30,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 590 treesize of output 578 [2021-11-21 00:13:30,501 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:30,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [672860707] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:30,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [443269619] [2021-11-21 00:13:30,504 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:13:30,504 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:30,505 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:30,505 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:30,505 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:30,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:30,553 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:13:30,553 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 00:13:30,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:30,593 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 00:13:30,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:30,715 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 00:13:30,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:30,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:30,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:30,905 INFO L354 Elim1Store]: treesize reduction 57, result has 10.9 percent of original size [2021-11-21 00:13:30,905 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 213 treesize of output 210 [2021-11-21 00:13:31,335 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 21 treesize of output 17 [2021-11-21 00:13:32,370 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 21 treesize of output 17 [2021-11-21 00:13:32,393 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:33,091 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:33,092 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:33,092 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11] total 26 [2021-11-21 00:13:33,092 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735956646] [2021-11-21 00:13:33,092 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:33,093 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-21 00:13:33,093 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:33,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-21 00:13:33,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=986, Unknown=6, NotChecked=0, Total=1122 [2021-11-21 00:13:33,094 INFO L87 Difference]: Start difference. First operand 34 states and 43 transitions. Second operand has 27 states, 27 states have (on average 1.7407407407407407) internal successors, (47), 26 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 00:13:33,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:33,525 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2021-11-21 00:13:33,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 00:13:33,525 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.7407407407407407) internal successors, (47), 26 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 18 [2021-11-21 00:13:33,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:33,526 INFO L225 Difference]: With dead ends: 41 [2021-11-21 00:13:33,526 INFO L226 Difference]: Without dead ends: 39 [2021-11-21 00:13:33,527 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 403 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=257, Invalid=1543, Unknown=6, NotChecked=0, Total=1806 [2021-11-21 00:13:33,528 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 49 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:33,528 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 42 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 184 Invalid, 0 Unknown, 9 Unchecked, 0.1s Time] [2021-11-21 00:13:33,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-21 00:13:33,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2021-11-21 00:13:33,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 36 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 00:13:33,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2021-11-21 00:13:33,534 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 18 [2021-11-21 00:13:33,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:33,535 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2021-11-21 00:13:33,535 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.7407407407407407) internal successors, (47), 26 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 00:13:33,535 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2021-11-21 00:13:33,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-21 00:13:33,536 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:33,536 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 3, 2, 2, 1, 1, 1, 1, 1] [2021-11-21 00:13:33,570 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:33,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:33,749 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:13:33,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:33,750 INFO L85 PathProgramCache]: Analyzing trace with hash 1486991388, now seen corresponding path program 4 times [2021-11-21 00:13:33,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:33,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091140270] [2021-11-21 00:13:33,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:33,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:33,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:33,984 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:33,984 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:33,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091140270] [2021-11-21 00:13:33,985 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2091140270] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:33,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231080428] [2021-11-21 00:13:33,985 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:13:33,985 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:33,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:33,990 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:34,009 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 00:13:34,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:34,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-21 00:13:34,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:34,149 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 17 treesize of output 13 [2021-11-21 00:13:34,273 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-21 00:13:34,298 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:34,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:34,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-21 00:13:34,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-21 00:13:34,572 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:34,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231080428] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:34,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [496976758] [2021-11-21 00:13:34,574 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:13:34,574 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:34,574 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:34,574 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:34,574 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:34,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:34,613 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:13:34,613 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 00:13:34,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:34,637 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 00:13:34,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:34,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 32 [2021-11-21 00:13:34,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:34,875 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:13:34,898 INFO L354 Elim1Store]: treesize reduction 92, result has 26.4 percent of original size [2021-11-21 00:13:34,898 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 218 treesize of output 225 [2021-11-21 00:13:35,240 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 21 treesize of output 17 [2021-11-21 00:13:35,914 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 21 treesize of output 17 [2021-11-21 00:13:35,952 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:36,634 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:36,634 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:36,634 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 27 [2021-11-21 00:13:36,635 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037266759] [2021-11-21 00:13:36,635 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:36,635 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-21 00:13:36,635 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:36,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-21 00:13:36,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=1081, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 00:13:36,636 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 27 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 00:13:36,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:36,982 INFO L93 Difference]: Finished difference Result 50 states and 59 transitions. [2021-11-21 00:13:36,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 00:13:36,982 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 27 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-21 00:13:36,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:36,983 INFO L225 Difference]: With dead ends: 50 [2021-11-21 00:13:36,983 INFO L226 Difference]: Without dead ends: 37 [2021-11-21 00:13:36,984 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 372 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=168, Invalid=1472, Unknown=0, NotChecked=0, Total=1640 [2021-11-21 00:13:36,985 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 14 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:36,985 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 93 Invalid, 336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:13:36,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-21 00:13:36,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-21 00:13:36,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.25) internal successors, (45), 36 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 00:13:36,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2021-11-21 00:13:36,991 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 21 [2021-11-21 00:13:36,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:36,991 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2021-11-21 00:13:36,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 27 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 00:13:36,991 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2021-11-21 00:13:36,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-21 00:13:36,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:36,992 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 3, 2, 2, 1, 1, 1, 1, 1] [2021-11-21 00:13:37,023 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:37,213 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:37,213 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:13:37,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:37,214 INFO L85 PathProgramCache]: Analyzing trace with hash -73461949, now seen corresponding path program 5 times [2021-11-21 00:13:37,214 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:37,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [332130941] [2021-11-21 00:13:37,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:37,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:37,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:37,458 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:37,458 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:37,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [332130941] [2021-11-21 00:13:37,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [332130941] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:37,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18767375] [2021-11-21 00:13:37,459 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:13:37,459 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:37,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:37,460 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:37,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 00:13:37,507 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-21 00:13:37,507 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:13:37,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-21 00:13:37,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:37,594 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 17 treesize of output 13 [2021-11-21 00:13:37,638 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-21 00:13:37,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-21 00:13:37,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-21 00:13:37,791 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:37,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:37,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2021-11-21 00:13:37,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 87 treesize of output 83 [2021-11-21 00:13:38,179 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:38,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [18767375] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:38,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1198239082] [2021-11-21 00:13:38,181 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:13:38,181 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:38,182 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:38,182 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:38,182 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:38,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:38,212 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:13:38,213 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 00:13:38,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:38,270 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:13:38,270 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 00:13:38,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:38,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 38 [2021-11-21 00:13:38,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:38,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:38,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:38,577 INFO L354 Elim1Store]: treesize reduction 57, result has 10.9 percent of original size [2021-11-21 00:13:38,577 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 219 treesize of output 216 [2021-11-21 00:13:38,906 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 21 treesize of output 17 [2021-11-21 00:13:39,931 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 21 treesize of output 17 [2021-11-21 00:13:39,942 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:40,592 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:40,592 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:40,592 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 30 [2021-11-21 00:13:40,592 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979128471] [2021-11-21 00:13:40,593 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:40,593 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-21 00:13:40,593 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:40,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-21 00:13:40,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=1279, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 00:13:40,594 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:41,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:41,143 INFO L93 Difference]: Finished difference Result 63 states and 71 transitions. [2021-11-21 00:13:41,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 00:13:41,143 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-21 00:13:41,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:41,144 INFO L225 Difference]: With dead ends: 63 [2021-11-21 00:13:41,144 INFO L226 Difference]: Without dead ends: 61 [2021-11-21 00:13:41,145 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 593 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=270, Invalid=2280, Unknown=0, NotChecked=0, Total=2550 [2021-11-21 00:13:41,146 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 38 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 407 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 28 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:41,146 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 103 Invalid, 407 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 337 Invalid, 0 Unknown, 28 Unchecked, 0.2s Time] [2021-11-21 00:13:41,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-21 00:13:41,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 41. [2021-11-21 00:13:41,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.225) internal successors, (49), 40 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 00:13:41,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2021-11-21 00:13:41,153 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 23 [2021-11-21 00:13:41,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:41,153 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2021-11-21 00:13:41,153 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:41,154 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2021-11-21 00:13:41,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 00:13:41,155 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:41,155 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-21 00:13:41,188 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:41,381 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-21 00:13:41,381 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:13:41,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:41,382 INFO L85 PathProgramCache]: Analyzing trace with hash 1933521457, now seen corresponding path program 6 times [2021-11-21 00:13:41,382 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:41,382 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1582741294] [2021-11-21 00:13:41,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:41,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:41,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:41,614 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 3 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:41,614 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:41,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1582741294] [2021-11-21 00:13:41,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1582741294] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:41,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1511296766] [2021-11-21 00:13:41,615 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:13:41,615 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:41,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:41,615 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:41,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 00:13:41,662 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:13:41,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:13:41,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-21 00:13:41,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:41,712 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 24 treesize of output 20 [2021-11-21 00:13:41,748 INFO L354 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-11-21 00:13:41,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 39 [2021-11-21 00:13:41,830 INFO L354 Elim1Store]: treesize reduction 96, result has 20.7 percent of original size [2021-11-21 00:13:41,831 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 65 treesize of output 58 [2021-11-21 00:13:42,564 INFO L354 Elim1Store]: treesize reduction 166, result has 4.0 percent of original size [2021-11-21 00:13:42,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 102 treesize of output 56 [2021-11-21 00:13:42,598 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 9 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:42,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:50,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 89 treesize of output 85 [2021-11-21 00:13:50,865 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:13:50,866 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2568 treesize of output 2500 [2021-11-21 00:13:51,812 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 43 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:51,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1511296766] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:51,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1597705242] [2021-11-21 00:13:51,814 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:13:51,814 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:51,814 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:51,814 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:51,814 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:51,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:51,844 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:13:51,844 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 00:13:51,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:51,881 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:13:51,881 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 00:13:52,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:52,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 00:13:52,122 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:52,122 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:13:52,144 INFO L354 Elim1Store]: treesize reduction 72, result has 22.6 percent of original size [2021-11-21 00:13:52,144 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 206 treesize of output 209 [2021-11-21 00:13:52,460 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 21 treesize of output 17 [2021-11-21 00:13:53,241 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 21 treesize of output 17 [2021-11-21 00:13:53,277 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:54,023 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:54,023 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:54,025 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14, 14] total 34 [2021-11-21 00:13:54,025 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036046875] [2021-11-21 00:13:54,026 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:54,026 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-21 00:13:54,026 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:54,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-21 00:13:54,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1508, Unknown=6, NotChecked=0, Total=1722 [2021-11-21 00:13:54,028 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 35 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:00,080 WARN L227 SmtUtils]: Spent 5.82s on a formula simplification. DAG size of input: 58 DAG size of output: 57 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 00:14:06,871 WARN L227 SmtUtils]: Spent 5.81s on a formula simplification. DAG size of input: 61 DAG size of output: 59 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 00:14:07,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:14:07,437 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2021-11-21 00:14:07,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-21 00:14:07,438 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have 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 00:14:07,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:14:07,438 INFO L225 Difference]: With dead ends: 63 [2021-11-21 00:14:07,438 INFO L226 Difference]: Without dead ends: 49 [2021-11-21 00:14:07,439 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 821 ImplicationChecksByTransitivity, 22.7s TimeCoverageRelationStatistics Valid=413, Invalid=2773, Unknown=6, NotChecked=0, Total=3192 [2021-11-21 00:14:07,440 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 10 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:14:07,440 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 57 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 63 Invalid, 0 Unknown, 43 Unchecked, 0.0s Time] [2021-11-21 00:14:07,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-21 00:14:07,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 44. [2021-11-21 00:14:07,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.186046511627907) internal successors, (51), 43 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 00:14:07,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 51 transitions. [2021-11-21 00:14:07,447 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 51 transitions. Word has length 26 [2021-11-21 00:14:07,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:14:07,448 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 51 transitions. [2021-11-21 00:14:07,448 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:07,448 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 51 transitions. [2021-11-21 00:14:07,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-21 00:14:07,449 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:14:07,449 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 3, 2, 2, 1, 1, 1, 1, 1] [2021-11-21 00:14:07,470 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 00:14:07,653 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 00:14:07,653 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:14:07,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:14:07,654 INFO L85 PathProgramCache]: Analyzing trace with hash -300108719, now seen corresponding path program 7 times [2021-11-21 00:14:07,654 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:14:07,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397351497] [2021-11-21 00:14:07,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:14:07,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:14:07,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:07,939 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 2 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:14:07,939 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:14:07,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397351497] [2021-11-21 00:14:07,939 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1397351497] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:14:07,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [761909089] [2021-11-21 00:14:07,939 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:14:07,939 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:07,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:14:07,940 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:14:07,941 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6476bb8-2d99-47a6-a29b-15f6c6e3750b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 00:14:07,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:07,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-21 00:14:07,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:14:08,100 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 17 treesize of output 13 [2021-11-21 00:14:08,144 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-21 00:14:08,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2021-11-21 00:14:08,195 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-21 00:14:08,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2021-11-21 00:14:08,239 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-21 00:14:08,240 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2021-11-21 00:14:08,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-21 00:14:08,383 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:14:08,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:15:07,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 51 [2021-11-21 00:15:07,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25849 treesize of output 25593